Lahontan Dam, Embankment dam in Churchill County, Nevada, United States.

Lahontan Dam is an earth-fill embankment dam on the Carson River, 49 m high and 520 m long, holding 560,000 m³ of fill. Completed in 1915, it impounds the Lahontan Reservoir, which stores water for irrigation and feeds hydroelectric generators with a total capacity of 4,000 kilowatts.

The dam was completed in 1915 and was one of the largest earth structures of its kind built in the United States. The project marked an important step in water management and irrigation engineering.

The dam's reservoir takes its name from Lake Lahontan, the ancient Pleistocene lake that once covered the Carson Desert. Construction crews lived in Lahontan City, a company town built for the workers, which still had 300 residents in 1940. Water distribution for irrigation began in 1916, the year the Truckee-Carson Project was renamed the Newlands Project.

The dam lies on the Carson River between Carson City and Fallon, in the Carson Desert. The reservoir is popular for fishing, boating and camping, so prepare for varying conditions by season: summer is hot and dry, winter cooler. The structure is 162 ft high and 1,700 ft long.

Lahontan City, a company town for the dam's workers, was built during construction and had a population of 300 in 1940. The dam was added to the National Register of Historic Places in 1981. Its power plant holds hydroelectric generators with a combined capacity of 4,000 kilowatts.