Day Island (California)

Day Island
Day Island in December 2022
Day Island is located in San Francisco Bay Area
Day Island
Day Island
Day Island is located in California
Day Island
Day Island
Day Island is located in the United States
Day Island
Day Island
Geography
LocationNorthern California
Coordinates38°06′13″N 122°29′26″W / 38.10361°N 122.49056°W / 38.10361; -122.49056 (Day Island)[1]
Adjacent toSan Pablo Bay
Highest elevation105 ft (32 m)[1]
Administration
United States
State California
CountyMarin
Day Island in a USGS topographic map from 1951[2]
Aerial image of an island.
USGS aerial imagery of Day Island in 2021

Day Island is an island at the mouth of the Petaluma River in San Pablo Bay (an embayment of San Francisco Bay).[3][4][5][6][7][8] It is part of Marin County, California.[9][10][11][12][13][14][15][16] Its coordinates are 38°06′13″N 122°29′26″W / 38.10361°N 122.49056°W / 38.10361; -122.49056 (Day Island)[1], and the United States Geological Survey measured its elevation as 105 ft (32 m) in 1981.[1] It appears on a 1951 USGS map of the area, although it appears on maps from as old as 1873.[2] The "1880 History of Marin County" by Alley, Bowen and Co. mentions "a man by name of Day" who "settled on an island in Novato township which has since borne his name" in 1851." To this day, there are still 2 houses on the island, one inhabited and one abandoned. The island is bordered by dirt and two lagoons to the west, and marshlands to the east, although it was once entirely surrounded by either marshland or water.[17]

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  17. ^ "Marin County". www.davidrumsey.com. Retrieved 2023-03-08.