The Old Mission Dam, located in San Diego, California

San Diego, California

San Diego is the eighth-largest city in the United States and second-largest city in California. The city is located on the coast of the Pacific Ocean in Southern California, immediately adjacent to the Mexican border. The birthplace of California, San Diego is known for its mild year-round...

 was the first major irrigation project on the Pacific coast. The stone and cement dam is 220 ft (67.1 m), 13 ft (4 m) at its base and 12 ft (3.7 m). Water was released for a sawmill and irrigation at the Mission San Diego de Alcalá

Mission San Diego de Alcalá

Mission Basilica San Diego de Alcalá, in San Diego, California, was the first Franciscan mission in the Las Californias Province of the Viceroyalty of New Spain. It was founded in 1769 by Spanish friar Junípero Serra in an area long inhabited by the Kumeyaay Indians...

, 5 miles (8 km) away.

It is now part of Mission Trails Regional Park

Mission Trails Regional Park

Mission Trails Regional Park is a 5,800 acre open space preserve within the city of San Diego, California, established in 1974. It is the sixth largest municipally-owned park in the United States, and the largest in California.-Description:...

, the largest municipal park in California.