Island No. 1
Island No. 1, submerged in March 2023 (as seen from the northern part of an internal levee, looking south).
Island No. 1 is located in San Francisco Bay Area
Island No. 1
Island No. 1
Island No. 1 is located in California
Island No. 1
Island No. 1
Island No. 1 is located in the United States
Island No. 1
Island No. 1
Geography
LocationNorthern California
Coordinates38°08′35″N 122°20′40″W / 38.14306°N 122.34444°W / 38.14306; -122.34444 (Island No. 1)[1]
Adjacent toNapa River
Highest elevation3 ft (0.9 m)[1]
Administration
United States
State California
CountyNapa and Solano
Island No. 1 as it appears on a 1951 USGS topographic map.
Aerial image of an island.
USGS aerial imagery of Island No. 1 in 2021.
An aerial view, looking toward the west, of the Napa River where it flows into San Pablo Bay through Vallejo. Islands visible include, from bottom of image: Mare, No. 1, Knight, Russ, No. 2, Green, Bull, Edgerly, Coon, Little, and Tubbs.

Island No. 1 (formerly called Cross Island)[2] is a partially submerged island in the Napa River, upstream of San Pablo Bay (an embayment of San Francisco Bay).[3][4][2] It is in Napa and Solano County, California, and parts of it are managed as part of the Napa-Sonoma Marshes Wildlife Area.[5][6] Its coordinates are 38°08′35″N 122°20′40″W / 38.14306°N 122.34444°W / 38.14306; -122.34444 (Island No. 1)[1], and the United States Geological Survey measured its elevation as 3 ft (0.91 m) in 1981.[1] It, along with Island No. 2, Green Island and Tubbs Island, are labeled on a 1902 USGS map of the area.[7]

References

  1. 1 2 3 4 U.S. Geological Survey Geographic Names Information System: Island No. 1
  2. 1 2 "Vallejo Proposes New Road To Bay Via San Rafael". The Sacramento Bee. Sacramento, California. May 18, 1921. p. 20.
  3. ↑ California State Automobile Association (1999). San Francisco Bay Region (Map). 1:190,000. American Automobile Association.
  4. ↑ "Salt plant will involve expenditure of $3,500,000". The Napa Valley Register. Napa, California. May 14, 1952. p. 16.
  5. ↑ "Directional Map Napa-Sonoma Marshes Wildlife Area". California Department of Fish and Wildlife, Bay Delta Region. May 2019. Archived from the original on April 23, 2020. Retrieved February 26, 2021.
  6. ↑ URS Corporation (May 2019). "Napa-Sonoma Marshes Wildlife Area Land Management Plan". California Department of Fish and Game. Retrieved February 26, 2021.
  7. ↑ Goode, R.U.; Fletcher, L.C. (1902), Topography, State of California: Woodward Island Quadrangle, United States Geological Survey


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