Old Mission Dam

Old Mission Dam
U.S. National Register of Historic Places
U.S. National Historic Landmark
California Historical Landmark #52
San Diego Historic Landmark #2
Old Mission Dam in 2008
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Location	Mission Trails Regional Park, San Diego, California
Coordinates	32°50′24″N 117°2′32″W / 32.84000°N 117.04222°W / 32.84000; -117.04222Coordinates: 32°50′24″N 117°2′32″W / 32.84000°N 117.04222°W / 32.84000; -117.04222
Area	0.3 acres (0.12 ha)
Built	1803
NRHP Reference #	66000225
CHISL #	52
SDHL #	2
Significant dates
Added to NRHP	October 15, 1966
Designated NHL	May 21, 1963
Designated CHISL	December 6, 1932
Designated SDHL	February 1, 1968

The Old Mission Dam, located in San Diego, California was the first major irrigation project on the Pacific coast of the United States. Located along the San Diego River, the stone and cement dam is 220 ft long (67 m), 13 ft wide (4.0 m) at its base and 12 ft high (3.7 m). Water was released for a sawmill and irrigation at the Mission San Diego de Alcalá, 5 miles (8.0 km) away.

It is now part of Mission Trails Regional Park, the largest municipal park in California. Old Mission Dam is also a registered state historic landmark.