Route 4 east continues to Stockton, where it briefly joins I-5 and then enters a separate freeway (known locally as the Crosstown Freeway) routing almost directly through downtown Stockton. The route then runs concurrent with State Route 99 before running eastward into the Sierra through Angels Camp, one of the richest quartz mining sections of the Mother Lode and home of The Celebrated Jumping Frog of Calaveras County, and Calaveras Big Trees State Park. The route runs through the . Pacific Grade Summit on its way up to the Ebbetts Pass and ends at State Route 89 ten miles (16 km) west of Topaz Lake, on the California-Nevada border. Signage indicating that SR 4 continues up to Woodfords exists in Woodfords heading Westbound, including reassurance shields for both SR 89 and SR 4 on top of the mileage sign just south of town. Eastbound signage for SR 4 stops at the intersection with SR 89. The portion from Arnold to its terminus is designated the Ebbetts Pass Scenic Byway, which is eventually one lane.