The proposed Santa Clara River stream gaging station is located on a private bridge crossing the Santa Clara River and on nearby uninhabited and bare ground areas upland of the river streambank, at the entrance to the Mountains Recreation and Conservation Authority (MRCA) property at 8237 Soledad Canyon Rd, Acton, CA 93510. The Santa Clara River is 83 miles long, and its source of water comes from the San Gabriel Mountains. The river runs westward, from north to northwest of Los Angeles, flows into the Oxnard Plain and into the Santa Barbara Channel of the Pacific Ocean. Its tributaries are San Francisquito Creek, Castaic Creek, Piru Creek, and Sespe Creek.
According to the United States Geological Survey (USGS) 7.5' quadrangle, the legal description is Township 4N, Range 13W (.34°26'18.84uN 118°16'41.2711W).