Live Chat I-15 Community Nearby Traffic Grass Valley Dam (Water dam) 2024-06-06 Roadnow Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to Grass Valley Dam (Water Dam) Central, UT 9.88 Saint George, UT 9.90 Veyo, UT 13.88 Interstate highway exits close to Grass Valley Dam (Water Dam) Exit 30, i15 21.83 Exit 22, i15 21.91 Exit 23, i15 21.98 Interstate highways close to Grass Valley Dam (Water Dam) i15 map 21.83 i70 map 154.43 i40 map 237.13 State roads close to Grass Valley Dam (Water Dam) UT 18 map 10.43 UT 228 map 21.86 UT 17 map 22.19