Live Chat I-90 Community Nearby Traffic US 81 SD 2024-09-22 Roadnow Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to US 81 SD Montrose, SD 15.94 Canistota, SD 17.13 Spencer, SD 17.32 Interstate highway exits close to US 81 SD Exit 364, i90 7.25 Exit 368, i90 9.54 Exit 357, i90 12.42 Interstate highways close to US 81 SD i90 map 7.25 i29 map 48.67 i229sd map 54.70 State roads close to US 81 SD US 81 SD map 0.30 SD 34 map 30.78 US 18 SD map 54.51