| Puddingstone Dam | |
| Location Map: | California |
| Coordinates: | 34.0903°N -117.8092°W |
| Country: | United States |
| Location: | San Dimas, Los Angeles County, California |
| Owner: | Los Angeles County Department of Public Works |
| Dam Height: | 147feet |
| Dam Length: | 2698feet |
| Dam Crosses: | Walnut Creek |
| Spillway Count: | Overflow |
| Res Name: | Puddingstone Reservoir |
| Res Capacity Total: | 22232acre feet |
| Res Capacity Active: | 16342acre feet |
| Res Catchment: | 33.1mi2 |
| Res Surface: | 490acres |
| Plant Hydraulic Head: | 135feet |
Puddingstone Dam is a 147feet high earth and rockfill dam in the San Gabriel Valley, within San Dimas in eastern Los Angeles County, California.
The dam was built in 1928 by the Los Angeles County Department of Public Works, which continues to operate it.
Puddingstone Dam serves mainly for flood control. It impounds Walnut Creek, a tributary of the San Gabriel River, to form Puddingstone Reservoir, which can hold more than 20000acre feet of water.[1] The reservoir stores floodwater from both the Walnut Creek Wash, and also the San Dimas Wash, to which it is connected by a short artificial channel below San Dimas Dam.