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Island No. 1

Island No. 1, submerged in March 2023 (as seen from the northern part of an internal levee, looking south).
Island No. 1Show map of San Francisco Bay AreaIsland No. 1Show map of CaliforniaIsland No. 1Show map of the United States
Geography
Location	Northern California
Coordinates	38°08′35″N 122°20′40″W / 38.14306°N 122.34444°W / 38.14306; -122.34444 (Island No. 1)
Adjacent to	Napa River
Highest elevation	3 ft (0.9 m)
Administration
United States
State	California
County	Napa and Solano

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

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

v t e Map: Islands of the San Francisco Bay Area

AlamedaAlcatrazAngelBairBay FarmBelvedereBird I.BrooksThe BrothersCastro RocksCoast GuardCorinthianGrecoGull R.HogHooksKent (off map)MareMussel RockRat RockRed R.San Pedro RockSeal RocksSeal RockThe SistersTreasureMarinYerba BuenaSkaggsStrawberryDrawbridge (islands of Suisun Bay and the Sacramento–San Joaquin River delta)BrewerBull (off map)BurdellCoonDayDeerEdgerlyGreen#1#2KnightLittleNeilsRussTubbsWoodBirdAramburuOgilvieSilvaSimmsJakesNewbyRichardson

v t e San Francisco Bay watershed
Outline	Hydrography Ecology List of tributaries List of lakes
Subdivisions	Major San Francisco Bay Suisun Bay San Pablo Bay Minor Golden Gate Grizzly Bay Richardson Bay San Rafael Bay Richmond Inner Harbor San Leandro Bay Former Yerba Buena Cove Mission Bay
Waterways	Rivers San Joaquin Sacramento Napa Guadalupe Petaluma Creeks (discharging into the Bay) Alameda Baxter Cerrito Codornices Coyote (Santa Clara) Coyote (Marin) San Leandro San Lorenzo Schoolhouse Temescal Sausal Redwood San Mateo Sonoma Corte Madera Arroyo Corte Madera del Presidio San Rafael Miller Novato Tolay San Francisquito Pacheco Alhambra Adobe Rodeo Refugio Pinole Garrity Rheem Karlson San Pablo Castro Wildcat Fluvius Innominatus Marin (Alameda County) Strawberry Easton Mission Creek Reservoirs Calaveras Reservoir Lafayette Reservoir Straits and estuaries Clifton Court Forebay Carquinez Strait Oakland Estuary Raccoon Strait Sacramento–San Joaquin River Delta Stockton Deepwater Shipping Channel Watersheds Laguna Creek Watershed Guadalupe watershed
Parks and protected areas	Don Edwards National Wildlife Refuge San Pablo Bay National Wildlife Refuge Eden Landing Ecological Reserve Hayward Regional Shoreline Hayward Shoreline Interpretive Center Crown Memorial State Beach McLaughlin Eastshore State Park Emeryville Crescent State Marine Reserve Point Isabel Regional Shoreline César Chávez Park Brooks Island Regional Preserve Point Pinole Regional Shoreline Antioch Dunes National Wildlife Refuge Coyote Point Recreation Area Middle Harbor Shoreline Park National Estuarine Research Reserve China Camp State Park San Francisco Maritime National Historical Park SF Bay Trail Oyster Bay Regional Shoreline Big Break Regional Shoreline Palo Alto Baylands Nature Preserve
Islands and peninsulas	Major islands Alameda Alcatraz Angel Treasure Island Yerba Buena Minor Brooks Bair Bay Farm Belvedere Brother Castro Rocks Coast Guard Greco Hooks Island Mare Red Rock The Sisters Marin Islands Roe Ryer Seal Islands Peninsulas/infill Albany Bulb Brisbane Baylands Point Isabel Foster City Fleming Point Hunters Point Sierra Point Steamboat Point
Wetlands	Baylands Belmont Chelsea Cordelia Crissy Field Hoffman Meeker Mowry Napa Sonoma Point Molate Salt ponds Seal Stege Steinberger Suisun Westpoint
Bridges and tubes	Bridges San Francisco–Oakland Eastern span replacement Richmond–San Rafael San Mateo–Hayward Dumbarton Dumbarton Rail Bridge (inactive) Golden Gate Benicia–Martinez Antioch Carquinez Leimert Park Street Fruitvale High Street Bay Farm Island Tubes Posey/Webster Street Transbay
Ferries	Angel Island–Tiburon Ferry Blue & Gold Fleet Golden Gate Ferry San Francisco Bay Ferry (WETA)
Ports and marinas	Port of San Francisco Oakland Seaport Port of Richmond Hunters Point Naval Shipyard Mare Island Naval Shipyard Port of Redwood City Berkeley Marina Oyster Point Marina/Park Westpoint Harbor Foster City Marina (proposed)
Other	History Delta and Dawn Discovery Site Humphrey the Whale San Leandro Oyster Beds Richmond Shipyards U.S. Army Corps of Engineers Bay Model Harold Gilliam Marincello Ecology Golden Gate Biosphere Reserve Cosco Busan oil spill Thicktail chub Delta smelt Conservation and Development Commission The Watershed Project Save The Bay Citizens for East Shore Parks Friends of Five Creeks Urban Creeks Council 1971 oil spill Greenbelt Alliance The Bay Institute Reber Plan San Francisco Baykeeper San Francisco Estuary and Watershed Science Estuary Partnership Transportation Water Trail Transportation in the San Francisco Bay Area
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• Islands of Solano County, California
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• San Pablo Bay
• San Francisco Bay Area geography stubs
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