Mountain House (formerly, Zimmerman's and Zimmerman's Mountain House) was a historic waystop for forty-niners halfway from San Francisco to the Sierra Nevada gold country. Today it is an unincorporated community in Alameda County, California, United States. It is located east-northeast of Livermore, and east of the Altamont Pass, historically the Livermore Pass, at an altitude of 207 feet (63 m), between the California Aqueduct and the Delta-Mendota Canal. San Joaquin County's Mountain House borrowed the name of the historic Mountain House and is located two miles (3 km) to the northeast further downstream on Mountain House Creek.