 SR 425 was formerly a part of SR 1 and U.S. Route 40 (US 40).SR 425 begins at the intersection of Third Street, Gold Ranch Road, and a state maintained frontage road in Verdi, near the West Verdi interchange (Exit 2) with Interstate 80.The highway follows Third Street northeast through the center of Verdi, then southeast to its terminus at the I-80 East Verdi interchange (Exit 5).