Live Chat I-39 Community Nearby Traffic Lake Mendota Dam (Water dam) 2024-06-09 Roadnow Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to Lake Mendota Dam (Water Dam) Triumph, IL 8.62 Troy Grove, IL 8.91 La Moille, IL 14.20 Interstate highway exits close to Lake Mendota Dam (Water Dam) Exit 72, i39 4.02 Exit 66, i39 9.41 Exit 82, i39 18.38 Interstate highways close to Lake Mendota Dam (Water Dam) i39 map 4.02 i80 map 19.08 i88 map 39.93 State roads close to Lake Mendota Dam (Water Dam) US 34 IL map 0.91 IL 251 map 1.73 US 51 IL map 3.95