Lake Spaulding Dam, Hydroelectric arch dam in Nevada County, United States

Lake Spaulding Dam is a 275-foot (84 m) concrete arch dam on the South Fork of the Yuba River in Nevada County, California. Designed by John R. Freeman and completed in 1913, it was the highest dam in California at the time. It impounds Lake Spaulding, a reservoir holding 74,773 acre-feet (92,231,000 m3) of water.

The dam was completed in 1913 as a major feat of early 20th-century engineering in California. It helped establish the region's system for water management and power generation.

Lake Spaulding, the reservoir the dam creates, is used for camping, boating, fishing and underwater diving. The lake lies at about 1,512 m in the pine-covered mountains of Nevada County, with Clyde Mountain rising 2.3 km away.

The dam stands at 1,512 m elevation in Nevada County, about 19.7 km northeast of Alta, with Clyde Mountain rising 2.3 km to the northwest. The reservoir it holds supports camping, boating, fishing and underwater diving. Mountain roads and weather shift with the seasons, so check conditions before setting out.

A temporary workers' camp called Camp Spaulding was built on site during construction to house the labor force. The settlement vanished once the project ended, leaving almost no trace of its existence.