Island No. 1

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[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]

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
Island No. 1
Island No. 1
Geography
LocationNorthern California
Coordinates38°08′35″N 122°20′40″W[1]
Adjacent toNapa River
Highest elevation3 ft (0.9 m)[1]
Administration
United States
State California
CountyNapa and Solano

References
  1. U.S. Geological Survey Geographic Names Information System: Island No. 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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