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Morris Dam
Morris Dam (officially the Samuel B. Morris Dam) is a concrete gravity dam across the San Gabriel River in the U.S. state of California. It impounds Morris Reservoir.
The dam was built in the 1930s as a water supply facility for the city of Pasadena, but is now mostly utilized for flood control and flow regulation for groundwater recharge. Situated in northern Los Angeles County, the dam impounds the Morris Reservoir in the Angeles National Forest, a few miles northeast of Azusa. From the 1940s to the 1990s, the reservoir was also used for underwater missile testing by the United States military.
==Design and location==
This dam sits south of Silver Mountain and north of Glendora Ridge, which flank the deep San Gabriel Canyon. It is roughly upstream of the San Gabriel River's mouth at the Pacific Ocean, and downstream of the river's beginning at the confluence of its East and West Forks.〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed March 10, 2011〕 Morris Reservoir is about long and above sea level at maximum pool, covering . The dam's crest itself is at an elevation of .
Serving mainly flood control, flow regulation and groundwater recharge purposes, the slightly arched Art Deco-style gravity dam is high and long. Its spillway, located slightly north of the main structure, is a concrete-lined chute controlled by three steel drum gates. The reservoir created by the dam, when first put into use, was capable of storing . Due to sedimentation though since that time, its capacity has been reduced by about 29%. At present, the reservoir when filled holds approximately .
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