Pisew Falls-Kwasitchewan Falls At Pisew Falls, the Grass River drops 13 m/ 42.7 ft., changes direction and jets down through a gorge. A short boardwalk leads to observation platforms. Another .5 km/.3 mi. trail leads to the Rotary Bridge over the Grass River below the falls giving access to trails leading to the top of Pisew Falls and to a 22 km return hiking trail to Kwasitchewan Falls, Manitoba's highest waterfall. Backcountry campsites are at the far end of the loop. Tel. 204-945-6784; toll-free: 1-800-214-6497. Location: between Wabowden and Thompson on Hwy. 6.