Dams & Reservoirs

In the San Gabriel Valley, the Los Angeles County Department of Public Works operates an extensive system of dams, debris basins, reservoirs and flood control channels not only to protect San Gabriel Valley residents from flooding, but they also act as water conservation facilities, trapping runoff and allowing it to slowly seep into the groundwater basin.

The dams and reservoirs that control the flow of the San Gabriel River and the Rio Hondo include:

A. Cogswell Reservoir on the west fork of the San Gabriel River;

B. San Gabriel Reservoir at the confluence of the west and east forks of the San Gabriel River;

C. Morris Reservoir near the mouth of the San Gabriel Canyon;