Live Chat I-680 CA Community Nearby Traffic Lake Herman Dam (Water dam) 2024-05-28 Roadnow Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to Lake Herman Dam (Water Dam) Port Costa, CA 4.39 Vallejo, CA 5.71 Crockett, CA 6.34 Interstate highway exits close to Lake Herman Dam (Water Dam) Exit 4, i780ca 1.13 Exit 5, i780ca 1.59 Exit 3a, i780ca 2.19 Interstate highways close to Lake Herman Dam (Water Dam) i780ca map 1.13 i680ca map 2.28 i80 map 6.60 State roads close to Lake Herman Dam (Water Dam) CA 29 map 6.65 CA 4 map 6.74 37 WESTBOUND map 9.61