Lake Ilsanjo

Lake Ilsanjo is a man-made lake located in Annadel State Park east of Santa Rosa in Sonoma County, California, United States. It is a place for fishing and swimming, especially in the summer months. Entrepreneur Joe Coney originally owned the land that is now Annadel State Park and named the lake after his wife Ilsa and himself. Thus it came to be called Lake Ilsanjo.[3] It drains into Spring Creek.

Lake Ilsanjo
The lake in 2013
Lake Ilsanjo
LocationSonoma County, California
Coordinates38.4269°N 122.6333°W / 38.4269; -122.6333[1]
Typereservoir
Primary inflowsSpring Creek
Primary outflowsSpring Creek
Basin countriesUnited States
Max. length650 yd (600 m)

The lake is formed by a dam constructed in the 1950s. Originally the overflow drained to a gully during the winter months, but in 2003, the state spent almost $400,000 building a spillway and release valve to reduce downstream erosion. During the winter of 2007–08, park officials accidentally left the release valve open, causing the lake level to drop far below normal, exposing mudflats that would normally be underwater.[4]

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