Lower Penitencia Creek channel improvements were constructed in 1955, 1962, 1965, and in the early 1980's. The existing channel within the project's reach was improved at multiple locations in the 1980s. The channel improvements consisted of various modifications to the creek to increase capacity. In the reaches north of the confluence with Lower Berryessa Creek, the channel was widened and levees were raised .
This project will prevent flooding from the channel caused by future larger flows from Berryessa Creek.*
* Flooding in nearby areas caused by another creek will be addressed in a separate project.