Maps & Posters
| Name | Agency | Department | Author | Year Published |
|---|---|---|---|
| Siegrist, Reagan, Randall and Jenson 2008 - Geologic Map Sections, Guam Mariana Islands (scan) | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist, Reagan, Randall and Jenson | 2008 |
| Siegrist et al. 2007 - Geologic Map of Agat Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2007 – Geologic Map of Apra Harbor Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2007 – Geologic Map of Dededo Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2007 – Geologic Map of Hagåtña Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2007 – Geologic Map of Inarajan Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2007 – Geologic Map of Merizo Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| *Siegrist et al. 2007 – Geologic Map of Pati Point Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| *Siegrist et al. 2007 – Geologic Map of Ritidian Point Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| *Siegrist et al. 2007 – Geologic Map of Talofofo Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2008 – Generalized Geology of Guam, Mariana Islands (Stratigraph Map) | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2008 – Composite Stratigraphic Sections (use with Stratigraph Map) | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2008 |
| Geologic map supplementary files: Geologic Formations of High Islands on the Philippine Sea Plate (Stratigraph Chronology) | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2008 |
| Tracey et al. 1964 – Geologic Map Sections Guam Mariana Islands, Professional Paper 403 | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | Tracey et al. | 1964 |
| Tracey et al. 1964 – Sample Locality Map of Guam, Mariana Islands, Professional Paper 403-A Plate 2 | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | Tracey et al. | 1964 |
| 1968 – Agat, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Apra Harbor, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Dededo, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Inarajan, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Inarajan, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Merizo, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Merizo, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1975 (68) – Agana, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Agana, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Agat, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Apra Harbor, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Pati Pont, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Pati Pont, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Ritidian Point, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Ritidian Point, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Talofofo, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | ||
| USGS Topographic Maps | USGS | ||
| USGS Geologic Maps | USGS | ||
| USGS GIS Data | USGS | ||
| General Geology of Guam (Professional Paper 403-A by J. I. Tracey, S. O. Schlanger, J. T. Stark, and H. G. May) Report Plates: Plate 1 | Plate 2 | Plate 3 | USGS | Tracey et al. | 1964 |
| USDA et al. 1985 – General Soil Map Territory of Guam | US Department of Agriculture, Soil Conservation Service, University of Guam, Government of Guam, Department of Commerce | USDA et al. | 1985 |
| Name | Agency | Department | Author | Year Published |
|---|---|---|---|
| Habana & Jenson 2018 – The Northern Guam Lens Aquifer | Water & Environmental Research Institute of the Western Pacific, University of Guam | Habana & Jenson | 2018 |
| Habana & Jenson 2018 – The Northern Guam Lens Aquifer NGWA 2018 | Water & Environmental Research Institute of the Western Pacific, University of Guam | Habana & Jenson | 2018 |
| Vann et al. 2017 – The Northern Guam Lens Aquifer | Water & Environmental Research Institute of the Western Pacific, University of Guam | Vann et al. | 2017 |
| Vann et al. 2001 – Revised Topographic Volcanic Basement | Water & Environmental Research Institute of the Western Pacific, University of Guam | Vann et al. | 2001 |
| Guam Hydrologic Survey Borehole Database: File Directory Google Maps | Guam Hydrologic Survey, Water & Environmental Research Institute of the Western Pacific, University of Guam | ||
| Google Maps One Guam Aquifer Monitoring Program Observation Wells Plus | Guam Hydrologic Survey, Water & Environmental Research Institute of the Western Pacific, University of Guam | ||
| Web MApps: Interagency Maps Library | Guam Hydrologic Survey, Water & Environmental Research Institute of the Western Pacific, University of Guam | ||
| MAppFx Library: MAppFx: NGLA Production Well Nitrates (Valerio et al., 2023) | Guam Hydrologic Survey, Water & Environmental Research Institute of the Western Pacific, University of Guam | Valerio et al. | 2023 |
| Production Well Status | Guam Waterworks Authority |
| Name | Agency | Department | Collection | Author | Year Published |
|---|---|---|---|---|
| MAppFx: Ugum Watershed Streamflow Duration Curves (Habana et al., 2023) | Guam Hydrologic Survey, Water & Environmental Research Institute of the Western Pacific, University of Guam | MAppFx Library | Habana et al. | 2023 |
| Name | Agency | Department | Collection |
|---|---|---|
| Production Well Owner and Operator | Guam Hydrologic Survey | Borehole Database |
| Wells in Aquifer Basins | Guam Hydrologic Survey | Borehole Database |
| Well Series or Group | Guam Hydrologic Survey | Borehole Database |
| Well Type and Sub-Type | Guam Hydrologic Survey | Borehole Database |
| Year Drilled | Guam Hydrologic Survey | Borehole Database |
| USGS Data Link | Guam Hydrologic Survey | Borehole Database |
| Downhole Video Map (YouTube videos) | Guam Hydrologic Survey | Borehole Database |
| Name | Agency | Department | Year Published | Notes |
|---|---|---|---|
| Maps for GIS (compressed zip file) | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 2017 | |
| 1819: La De Freycinet – ESSAI, sur la géographic ancienne, DE L’ÎLE GWAM, Capitale des Îles Mariannes | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1819 | 1800s |
| 1852: Coello – Guajan. Los nombres encerrados en parentesio corresponden å lugares antiguos, hoy dia despoblados | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1852 | 1800s |
| 1852: Coello – Bahia Y Ciudad de Agaña, 1/20,000, Islas Meiacosxima | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1852 | 1800s |
| 1900: Wheeler – Guam or Guajan Island, Exhibit A. | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1900 | 1900s |
| 1902: L.M. Cox (CEC USN) – Island of Guam, 1:124,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1902 | 1900s |
| 1913-1914: Strudevant et al. (Corps of Engineers) North Portion (Sheet 1 of 4), 1:25,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1913-1914 | 1910s |
| 1913-1914: Strudevant et al. (Corps of Engineers) North Central Portion (Sheet 2 of 4), 1:25,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1913-1914 | 1910s |
| 1913-1914: Strudevant et al. (Corps of Engineers) South Central Portion (Sheet 3 of 4), 1:25,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1913-1914 | 1910s |
| 1913-1914: Strudevant et al. (Corps of Engineers) South Portion (Sheet 4 of 4), 1:25,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1913-1914 | 1910s |
| 1915: City of Agana ~1915~, 1″ = 150′ | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1915 | 1910s |
| 1938: Fig. 118. Apra harbour, Guam, From lines are approximately 200-ft. intervals. Based on official sources | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1938 | 1930s |
| 1939: Special Military Map of Island of Guam, War Plans Section, Marine Barracks, Quantico, Wa., 1:60,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1939 | 1930s |
| 1944: Army Map Service (AMS), 2nd Edition, Map of Guam Island, US Army, Washington DC | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) Island of Guam (Uruno Point, Sheet 1 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Ritidian Point, Sheet 2 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Tumon Bay, Sheet 3 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Apra Harbor, Sheet 5 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| **1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agana Bay, Sheet 6 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agana Bay, Sheet 6 of 11, v2) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Pagat Point, Sheet 7 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agat Bay, Sheet 8 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agat Bay, Sheet 8 of 11, v2) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Talofofo Bay, Sheet 9 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Port Merizo, Sheet 10 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Port Inarajan, Sheet 11 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1944: Army Map Service (AMS), 2nd Edition, Map of Guam Island, US Army, Washington DC | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1944 | 1940s |
| 1954: AMS (AFFE) Edition 1 Guam | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1954 | 1950s |
| 1984: Chase et al., Marine Physiography of the Commonwealth of the Northern Mariana Islands, Department of Interior, US Geological Survey | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1984 | 1980s |
Geologic, Topographic, Soils
| Name | Agency | Department | Author | Year Published |
|---|---|---|---|
| Siegrist, Reagan, Randall and Jenson 2008 - Geologic Map Sections, Guam Mariana Islands (scan) | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist, Reagan, Randall and Jenson | 2008 |
| Siegrist et al. 2007 - Geologic Map of Agat Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2007 – Geologic Map of Apra Harbor Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2007 – Geologic Map of Dededo Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2007 – Geologic Map of Hagåtña Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2007 – Geologic Map of Inarajan Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2007 – Geologic Map of Merizo Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| *Siegrist et al. 2007 – Geologic Map of Pati Point Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| *Siegrist et al. 2007 – Geologic Map of Ritidian Point Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| *Siegrist et al. 2007 – Geologic Map of Talofofo Quadrangle, Guam | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2008 – Generalized Geology of Guam, Mariana Islands (Stratigraph Map) | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2007 |
| Siegrist et al. 2008 – Composite Stratigraphic Sections (use with Stratigraph Map) | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2008 |
| Geologic map supplementary files: Geologic Formations of High Islands on the Philippine Sea Plate (Stratigraph Chronology) | Water & Environmental Research Institute of the Western Pacific, University of Guam | Siegrist et al. | 2008 |
| Tracey et al. 1964 – Geologic Map Sections Guam Mariana Islands, Professional Paper 403 | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | Tracey et al. | 1964 |
| Tracey et al. 1964 – Sample Locality Map of Guam, Mariana Islands, Professional Paper 403-A Plate 2 | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | Tracey et al. | 1964 |
| 1968 – Agat, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Apra Harbor, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Dededo, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Inarajan, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Inarajan, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Merizo, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1968 – Merizo, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1968 | |
| 1975 (68) – Agana, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Agana, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Agat, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Apra Harbor, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Pati Pont, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Pati Pont, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Ritidian Point, Guam, Quadrangle | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Ritidian Point, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | 1975 | |
| 1975 (68) – Talofofo, Guam, Quadrangle, Mylar | US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with GovGuam | ||
| USGS Topographic Maps | USGS | ||
| USGS Geologic Maps | USGS | ||
| USGS GIS Data | USGS | ||
| General Geology of Guam (Professional Paper 403-A by J. I. Tracey, S. O. Schlanger, J. T. Stark, and H. G. May) Report Plates: Plate 1 | Plate 2 | Plate 3 | USGS | Tracey et al. | 1964 |
| USDA et al. 1985 – General Soil Map Territory of Guam | US Department of Agriculture, Soil Conservation Service, University of Guam, Government of Guam, Department of Commerce | USDA et al. | 1985 |
Northern Guam Lens Aquifer
| Name | Agency | Department | Author | Year Published |
|---|---|---|---|
| Habana & Jenson 2018 – The Northern Guam Lens Aquifer | Water & Environmental Research Institute of the Western Pacific, University of Guam | Habana & Jenson | 2018 |
| Habana & Jenson 2018 – The Northern Guam Lens Aquifer NGWA 2018 | Water & Environmental Research Institute of the Western Pacific, University of Guam | Habana & Jenson | 2018 |
| Vann et al. 2017 – The Northern Guam Lens Aquifer | Water & Environmental Research Institute of the Western Pacific, University of Guam | Vann et al. | 2017 |
| Vann et al. 2001 – Revised Topographic Volcanic Basement | Water & Environmental Research Institute of the Western Pacific, University of Guam | Vann et al. | 2001 |
| Guam Hydrologic Survey Borehole Database: File Directory Google Maps | Guam Hydrologic Survey, Water & Environmental Research Institute of the Western Pacific, University of Guam | ||
| Google Maps One Guam Aquifer Monitoring Program Observation Wells Plus | Guam Hydrologic Survey, Water & Environmental Research Institute of the Western Pacific, University of Guam | ||
| Web MApps: Interagency Maps Library | Guam Hydrologic Survey, Water & Environmental Research Institute of the Western Pacific, University of Guam | ||
| MAppFx Library: MAppFx: NGLA Production Well Nitrates (Valerio et al., 2023) | Guam Hydrologic Survey, Water & Environmental Research Institute of the Western Pacific, University of Guam | Valerio et al. | 2023 |
| Production Well Status | Guam Waterworks Authority |
Southern Guam Water Resources
| Name | Agency | Department | Collection | Author | Year Published |
|---|---|---|---|---|
| MAppFx: Ugum Watershed Streamflow Duration Curves (Habana et al., 2023) | Guam Hydrologic Survey, Water & Environmental Research Institute of the Western Pacific, University of Guam | MAppFx Library | Habana et al. | 2023 |
Google Maps
| Name | Agency | Department | Collection |
|---|---|---|
| Production Well Owner and Operator | Guam Hydrologic Survey | Borehole Database |
| Wells in Aquifer Basins | Guam Hydrologic Survey | Borehole Database |
| Well Series or Group | Guam Hydrologic Survey | Borehole Database |
| Well Type and Sub-Type | Guam Hydrologic Survey | Borehole Database |
| Year Drilled | Guam Hydrologic Survey | Borehole Database |
| USGS Data Link | Guam Hydrologic Survey | Borehole Database |
| Downhole Video Map (YouTube videos) | Guam Hydrologic Survey | Borehole Database |
Historic Maps
| Name | Agency | Department | Year Published | Notes |
|---|---|---|---|
| Maps for GIS (compressed zip file) | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 2017 | |
| 1819: La De Freycinet – ESSAI, sur la géographic ancienne, DE L’ÎLE GWAM, Capitale des Îles Mariannes | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1819 | 1800s |
| 1852: Coello – Guajan. Los nombres encerrados en parentesio corresponden å lugares antiguos, hoy dia despoblados | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1852 | 1800s |
| 1852: Coello – Bahia Y Ciudad de Agaña, 1/20,000, Islas Meiacosxima | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1852 | 1800s |
| 1900: Wheeler – Guam or Guajan Island, Exhibit A. | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1900 | 1900s |
| 1902: L.M. Cox (CEC USN) – Island of Guam, 1:124,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1902 | 1900s |
| 1913-1914: Strudevant et al. (Corps of Engineers) North Portion (Sheet 1 of 4), 1:25,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1913-1914 | 1910s |
| 1913-1914: Strudevant et al. (Corps of Engineers) North Central Portion (Sheet 2 of 4), 1:25,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1913-1914 | 1910s |
| 1913-1914: Strudevant et al. (Corps of Engineers) South Central Portion (Sheet 3 of 4), 1:25,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1913-1914 | 1910s |
| 1913-1914: Strudevant et al. (Corps of Engineers) South Portion (Sheet 4 of 4), 1:25,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1913-1914 | 1910s |
| 1915: City of Agana ~1915~, 1″ = 150′ | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1915 | 1910s |
| 1938: Fig. 118. Apra harbour, Guam, From lines are approximately 200-ft. intervals. Based on official sources | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1938 | 1930s |
| 1939: Special Military Map of Island of Guam, War Plans Section, Marine Barracks, Quantico, Wa., 1:60,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1939 | 1930s |
| 1944: Army Map Service (AMS), 2nd Edition, Map of Guam Island, US Army, Washington DC | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) Island of Guam (Uruno Point, Sheet 1 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Ritidian Point, Sheet 2 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Tumon Bay, Sheet 3 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Apra Harbor, Sheet 5 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| **1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agana Bay, Sheet 6 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agana Bay, Sheet 6 of 11, v2) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Pagat Point, Sheet 7 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agat Bay, Sheet 8 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agat Bay, Sheet 8 of 11, v2) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Talofofo Bay, Sheet 9 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Port Merizo, Sheet 10 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Port Inarajan, Sheet 11 of 11) 1:20,000 | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1942 | 1940s |
| 1944: Army Map Service (AMS), 2nd Edition, Map of Guam Island, US Army, Washington DC | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1944 | 1940s |
| 1954: AMS (AFFE) Edition 1 Guam | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1954 | 1950s |
| 1984: Chase et al., Marine Physiography of the Commonwealth of the Northern Mariana Islands, Department of Interior, US Geological Survey | Northern Guam Soil & Water Conservation District (NGSSWCD, Joseph Santos), Guam Department of Land Management (GDLM) | 1984 | 1980s |
Water and Environmental Research Institute of the Western Pacific, University of Guam
Siegrist, Reagan, Randall, and Jenson 2008 – Geologic Map Sections, Guam Mariana Islands (scan)
Siegrist et al. 2007 – Geologic Map of Agat Quadrangle, Guam
Siegrist et al. 2007 – Geologic Map of Apra Harbor Quadrangle, Guam
Siegrist et al. 2007 – Geologic Map of Dededo Quadrangle, Guam
Siegrist et al. 2007 – Geologic Map of Hagåtña Quadrangle, Guam
Siegrist et al. 2007 – Geologic Map of Inarajan Quadrangle, Guam
Siegrist et al. 2007 – Geologic Map of Merizo Quadrangle, Guam
*Siegrist et al. 2007 – Geologic Map of Pati Point Quadrangle, Guam
*Siegrist et al. 2007 – Geologic Map of Ritidian Point Quadrangle, Guam
*Siegrist et al. 2007 – Geologic Map of Talofofo Quadrangle, Guam
Siegrist et al. 2008 – Generalized Geology of Guam, Mariana Islands (Stratigraph Map)
Siegrist et al. 2008 – Composite Stratigraphic Sections (use with Stratigraph Map)
Links with a (*) star are links that are currently under construction. Sorry for the inconvenience.
Geologic Map Supplimentary Files:
Geologic Formations of High Islands on the Philippine Sea Plate (Stratigraph Chronology)
US Department of Interior, Geologic Survey, and NOS/NOAA, in cooperation with the Government of Guam
Tracey et al. 1964 – Geologic Map Sections Guam Mariana Islands, Professional Paper 403
Tracey et al. 1964 – Sample Locality Map of Guam, Mariana Islands, Professional Paper 403-A Plate 2
1968 – Agat, Guam, Quadrangle
1968 – Apra Harbor, Guam, Quadrangle
1968 – Dededo, Guam, Quadrangle
1968 – Inarajan, Guam, Quadrangle
1968 – Inarajan, Guam, Quadrangle, Mylar
1968 – Merizo, Guam, Quadrangle
1968 – Merizo, Guam, Quadrangle, Mylar
1975 (68) – Agana, Guam, Quadrangle
1975 (68) – Agana, Guam, Quadrangle, Mylar
1975 (68) – Agat, Guam, Quadrangle, Mylar
1975 (68) – Apra Harbor, Guam, Quadrangle, Mylar
1975 (68) – Pati Pont, Guam, Quadrangle
1975 (68) – Pati Pont, Guam, Quadrangle, Mylar
1975 (68) – Ritidian Point, Guam, Quadrangle
1975 (68) – Ritidian Point, Guam, Quadrangle, Mylar
1975 (68) – Talofofo, Guam, Quadrangle, Mylar
US Geological Survey Maps
USGS Topographic Maps
USGS Geologic Maps
USGS GIS Data
General Geology of Guam (Professional Paper 403-A by J. I. Tracey, S. O. Schlanger, J. T. Stark, and H. G. May):
- Report (PDF)
- Plates
US Department of Agriculture, Soil Conservation Service, University of Guam, Government of Guam, Department of Commerce
WERI UOG
WERI Collection
Guam Waterworks Authority
Guam Environmental Protection Agency
WERI UOG
Water and Environmental Research Institute of the Western Pacific, University of Guam
Habana & Jenson 2018 – The Northern Guam Lens Aquifer
Habana & Jenson 2018 – The Northern Guam Lens Aquifer NGWA 2018
Vann et al. 2017 – The Northern Guam Lens Aquifer
Vann et al. 2001 – Revised Topographic Volcanic Basement
WERI Collection
Guam Hydrologic Survey Borehole Database
File Directory
Google Maps
Google Maps
One Guam Aquifer Monitoring Program
Observation Wells Plus
Web MApps
Interagency Maps Library
MAppFx Library
MAppFx: NGLA Production Well Nitrates (Valerio et al., 2023)
Selected Slides (coming soon)
Guam Waterworks Authority
Guam Waterworks Authority (Guam Production Wells and Borehole Database)
Guam Environmental Protection Agency
Links to files are still under construction. Please check again later.
WERI UOG
WERI UOG
MAppFx Library
MAppFx: Southern Guam – Ugum Watershed Streamflow Duration Curves (Habana et al., 2023)
GHS Borehole Database
GHS Borehole Database
Guam Hydrologic Survey Borehole Database
Google Maps
Production well owner and operator
Wells in Aquifer Basins
Well series or group
Well type Sub type
Year drilled
Google Maps Links
USGS Data link
Downhole Video Map (YouTube Videos)
Northern Guam Soil and Water Conservation District, Guam Department of Land Management
Courtesy of the Northern Guam Soil and Water Conservation District (NGSWCD, Joseph Santos) and the Guam Department of Land Management (GDLM). The list below is an excellent resource for historical reference and determining the use of Guamanian name places.
Links with a (**) double star are links that are currently under construction. Sorry for the inconvenience.
’00s
1900: Wheeler – Guam or Guajan Island, Exhibit A.
1902: L.M. Cox (CEC USN) – Island of Guam, 1:124,000
’10s
1913-1914: Strudevant et al. (Corps of Engineers) North Portion (Sheet 1 of 4), 1:25,000
1913-1914: Strudevant et al. (Corps of Engineers) North Central Portion (Sheet 2 of 4), 1:25,000
1913-1914: Strudevant et al. (Corps of Engineers) South Central Portion (Sheet 3 of 4), 1:25,000
1913-1914: Strudevant et al. (Corps of Engineers) South Portion (Sheet 4 of 4), 1:25,000
1915: City of Agana ~1915~, 1″ = 150′
’30s
1939: Special Military Map of Island of Guam, War Plans Section, Marine Barracks, Quantico, Wa., 1:60,000
’40s
1944: Army Map Service (AMS), 2nd Edition, Map of Guam Island, US Army, Washington DC
1942: Corps of Engineers (COE) Island of Guam (Uruno Point, Sheet 1 of 11) 1:20,000
1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Ritidian Point, Sheet 2 of 11) 1:20,000
1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Tumon Bay, Sheet 3 of 11) 1:20,000
1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Apra Harbor, Sheet 5 of 11) 1:20,000
**1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agana Bay, Sheet 6 of 11) 1:20,000
1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agana Bay, Sheet 6 of 11, v2) 1:20,000
1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Pagat Point, Sheet 7 of 11) 1:20,000
1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agat Bay, Sheet 8 of 11) 1:20,000
1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Agat Bay, Sheet 8 of 11, v2) 1:20,000
1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Talofofo Bay, Sheet 9 of 11) 1:20,000
1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Port Merizo, Sheet 10 of 11) 1:20,000
1942: Corps of Engineers (COE) (1922 and 1942) Island of Guam (Port Inarajan, Sheet 11 of 11) 1:20,000
1944: Army Map Service (AMS), 2nd Edition, Map of Guam Island, US Army, Washington DC
’50s
1954: AMS (AFFE) Edition 1 Guam
’80s