Abstract Shoshone Falls is on the Snake River about 4 mi (6 km) northeast of the city of Twin Falls, near the midpoint of a chaotically eroded 14-mi (22-km) section of the Snake River canyon (Fig. 1). The south side of the falls, where the city maintains apicnic ground and park, offers the best views. Westbound travelers on I–84 should take the Kimberly-Twin Falls exit (no. 182), cross the Snake River on the Hansen Bridge, drive 5 mi (8 km) west on Addison Avenue, and then follow the signs northward to the falls. Those traveling east should take the Twin Falls exit at U.S. 93 (no. 173), cross the Snake River on the Perrine Memorial Bridge, and drive 3 mi (5 km) east on Falls Avenue to the Shoshone Falls road. Viewpoints on the south rim of the canyon at both bridges are convenient stopping places to see the narrow canyon above the falls and the wide canyon enlarged by flood erosion downstream. The north side of the falls can be reached by an improved road leading from U.S. 93.