The Cosumnes River Preserve is located off Interstate 5 between Sacramento and Stockton.
From I-5 (Sacramento Area-North):
Take Interstate 5 south to the Twin Cities Road exit (marked with a binoculars sign for wildlife viewing) about midway between Stockton and Sacramento. Take Twin Cities Road exit and go East for exactly one mile, to the first stop sign. Turn right at the first stop sign, onto Franklin Boulevard, for 1.7 miles. The Visitor Center is located on the left side of Franklin Boulevard. Continue down Franklin Boulevard and park in the parking lot just past the Visitor Center.
From I-5 (Stockton Area-South):
Take Interstate 5 north to the Thornton-Walnut Grove Road exit. Go east towards the Chevon gas station and turn left immediately after the Chevron station onto Thornton Rd. Follow Thornton Road north for about 2 miles and it will turn into Franklin Boulevard, continue north on Franklin crossing over the Thornton-Franklin bridge. The Visitor Center and parking are on your right, just after the bridge.
From Highway 99:
Take Highway 99 to the Exit 277 Highway 104 Ione/Jackson/Twin Cities exit midway between Stockton and Sacramento. Take Twin Cities Road west for about 6 miles and turn left onto Bruceville Road. Continue south on Bruceville Road and at the end turn right onto Desmond Road. Follow Desmond Road for about a mile over the Railroad tracks and turn left onto Franklin Boulevard. Continue down Franklin Boulevard and park in the parking lot just past the Visitor Center.
Overall Parcel Map