The Sweetwater Dam is a dam across the Sweetwater River in San Diego County, California. As the Crow flies, it sits about 12 miles (19 km) east of San Diego and 9 miles (14 km) northeast of Chula Vista; and just south of the city of La Presa. The 108-foot (33 m)-high masonry arch dam impounds 960-acre (390 ha) Sweetwater Reservoir.
The dam was first constructed in 1888 as part of a system of reservoirs on San Diego County rivers designed to provide water to irrigate crops along the coast and to supply the city of San Diego and its outlying towns. Over the next few decades the dam was raised and retrofitted several times from its original height of 60 feet (18 m). In 1916, a heavy flood caused both abutments of the dam to fail. Fortunately, the rest of the dam did not sustain heavy damage and it remains in use today serving flood control, water storage and recreation.