Sierra Madre Dam
| Sierra Madre Dam | |
|---|---|
 Location of Sierra Madre Dam in California
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| Country | United States |
| Location | San Gabriel Mountains, California |
| Coordinates | 34°10′34″N 118°02′34″W / 34.17611°N 118.04278°WCoordinates: 34°10′34″N 118°02′34″W / 34.17611°N 118.04278°W |
| Purpose | flood control |
| Opening date | 1928 |
| Dam and spillways | |
| Type of dam | arch dam |
| Impounds | Little Santa Anita Creek |
| Height | 69 feet (21 m) |
| Length | 200 feet (61 m) |
| Spillways | 1 |
The Sierra Madre Dam is a dam on Little Santa Anita Creek, at the mouth of Little Santa Anita Canyon, in Los Angeles County, California. It is in the San Gabriel Mountains, south of the Angeles National Forest, on the northern border of Sierra Madre.
The concrete arch dam has a height of 69 feet (21 m), and a width of 200 feet (61 m). Construction was completed in 1928. It is owned by Los Angeles County Department of Public Works. At the lower face of the dam, water can be released out of a steel grille covered 4 feet (1.2 m) diameter outlet onto a spillway, and then into channelized Little Santa Anita Creek.
In the 1940s CCC—Civilian Conservation Corps workers built the concrete channel containing the creek, from the dam through adjacent Sierra Madre. They also constructed public street bridges and footbridges across the channel in the Sierra Madre Canyon neighborhood.
The dam's debris basin, when unfilled with sediment and a small reservoir, can have a storage capacity of 51 acre feet (63,000 m3), and a normal surface area of 1 acre. Its surrounding perimeter watershed area is 0.77 square miles (2.0 km2), with some slopes coated in gunnite. The upstream drainage basin for Little Santa Anita Creek is much larger.
Little Santa Anita Creek is a tributary of Santa Anita Creek, which is a tributary of the Rio Hondo at their confluence in Whittier Narrows. The Rio Hondo is a major tributary of the Los Angeles River.
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