Lake Ilsanjo is a man-made
lake
A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...
located in
Annadel State Park
Trione-Annadel State Park is a state park of California in the United States. It is situated at the northern edge of Sonoma Valley and is adjacent to Spring Lake Regional Park in Santa Rosa. It offers many recreational activities within its prop ...
east of
Santa Rosa
Santa Rosa is the Italian, Portuguese and Spanish name for Saint Rose.
Santa Rosa may also refer to:
Places Argentina
*Santa Rosa, Mendoza, a city
* Santa Rosa, Tinogasta, Catamarca
* Santa Rosa, Valle Viejo, Catamarca
* Santa Rosa, La Pampa
* S ...
in
Sonoma County, California,
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
. 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. It drains into
Spring Creek
A spring creek is a type of free flowing river whose name derives from its origin: an underground spring or set of springs which produces sufficient water to consistently feed a unique river. The water flowing in a spring creek may additionally b ...
.
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
State may refer to:
Arts, entertainment, and media Literature
* ''State Magazine'', a monthly magazine published by the U.S. Department of State
* ''The State'' (newspaper), a daily newspaper in Columbia, South Carolina, United States
* ''Our S ...
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.
See also
*
Ledson Marsh
*
List of lakes in California
There are more than 3,000 named lakes, reservoirs, and dry lakes in the U.S. state of California.
Largest lakes
In terms of area covered, the largest lake in California is the Salton Sea, a lake formed in 1905 which is now saline. It occupie ...
*
List of lakes in the San Francisco Bay Area
This list of lakes in the San Francisco Bay Area groups lakes, ponds, and reservoirs by county. Numbers in parentheses are Geographic Names Information System feature ids.
Alameda County
* Almond Reservoir ()
* Berryman Reservoir ()
* Bethany ...
References
External links
Reservoirs in Sonoma County, California
Reservoirs in California
Reservoirs in Northern California
{{SonomaCountyCA-geo-stub