sentences:  The "Lochsa River Floating Guide" lists more than 60 rapids between Powell and Lowell, most of which are rated Class III-IV (medium to difficult).Depending on the discharge rate, the level of difficulty can rise in places to Class VI (the limits of navigation) on the International Scale of River Difficulty.The ratings in the "Floating Guide" reflect the difficulty of the Lochsa's rapids when the water levels at the bridge at Lowell are between and .