Morena Dam

Reservoir Levels Weather Hydrology

Morena Dam is a concrete arch dam located in San Diego County, California. It was built in 1912 by the Morena Rock Company to provide irrigation water for crops in the surrounding areas. The dam has a height of 155 feet and a length of 540 feet. It impounds the waters of the Cottonwood Creek and is used as a storage reservoir for the City of San Diego.

The hydrology of the dam is sourced from both surface flow and snowpack. The dam collects water from the Cottonwood Creek and from the mountainous regions surrounding the area. The snowmelt from the nearby Laguna Mountains also contributes to the water supply of the dam. The water stored in the dam is used for agricultural purposes and for recreation, including fishing and boating.

The dam has faced a few challenges in the past, including the 2003 Cedar Fire, which burnt a significant portion of the watershed that supplies water to the dam. Despite this, the dam has continued to provide a reliable water supply to the surrounding communities.

June 14, 2024







Storage 24hr Change None%
Percent of Normal None%
Minimum 3,448 acre-ft
Maximum 12,515 acre-ft
Average acre-ft
Dam_Height 181
Hydraulic_Height 167
Drainage_Area 114
Year_Completed 1912
Nid_Storage 50206
River_Or_Stream Cottonwood Cr
Primary_Dam_Type Rockfill
Surface_Area 1475
Hazard_Potential High
Dam_Length 550
Nid_Height 181

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