Puddingstone Dam
Location of Puddingstone Dam in California
Country	United States
Location	San Dimas, Los Angeles County, California
Coordinates	34°05′25″N 117°48′33″W / 34.09028°N 117.80917°W / 34.09028; -117.80917
Construction began	1925; 99 years ago (1925)
Opening date	1928; 96 years ago (1928)
Owner(s)	Los Angeles County Department of Public Works
Dam and spillways
Type of dam	Rock-fill
Impounds	Walnut Creek
Height	147 ft (45 m)
Length	2,698 ft (822 m)
Spillways	Overflow
Reservoir
Creates	Puddingstone Reservoir
Total capacity	22,232 acre⋅ft (27,423,000 m3)
Active capacity	16,342 acre⋅ft (20,158,000 m3)
Catchment area	33.1 sq mi (86 km2)
Surface area	490 acres (200 ha)
Power Station
Hydraulic head	135 ft (41 m)

Puddingstone Dam is a 147 ft (45 m) 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.

Geography

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 20,000 acre⋅ft (25,000,000 m³) 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.