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Enlarge L. L. Anderson Dam Spillway
L.L. Anderson Dam is on the middle fork of the American River at French Meadows Reservoir. It is primarily a water supply facility owned by the Placer County Water Agency. In the event of the maximum possible flood in the American River Watershed, the dam would be unable to contain the extreme flows and could fail, sending additional flood flows into Folsom Lake.

As a result, plans call for enlarging the spillway and making other modifications to L.L. Anderson Dam so that it can contain the Probable Maximum Flood and thereby reduce potential flood flows into Folsom. Coordinating the flood control improvements to these two dams is a significant part of the watershed approach the Corps and its partners are taking to reducing Sacramento’s flood risk.


 

 

Dam raise reduces flood risk

Ecosystem restoration and habitat improvement

Mooney Ridge infrequent inundation


Coordinating the flood control improvements to these two dams is a significant part of the watershed approach the Corps and its partners are taking to reducing Sacramento’s flood risk.