Lochsa [LO1]


This is probably the most difficult stretch on the Lochsa. At high water, it contains some very large holes and requires precise maneuvering. Swims here can last for quite a while since the current is fast and continuous.

At low to medium flows, be careful at Onno’s Hole, four miles below the put-in, halfway between highway mileage marker 131 and 132. The center tongue of the rapid leads unsuspecting boaters into a huge hole. The rapid can be identified by a lone ponderosa pine on a ridge to the right of the river.

Castle Creek Rapid, half a mile below Onno’s Hole, is probably the most difficult rapid on the river. It is long and contains many large holes and/or rocks, depending on water flow. Three Hole Rapid, a mile below Castle Creek, should also be scouted.

River Stats



IV- to IV+

Trip Length

30 mi.


Spring and early summer


USGS Realtime Streamflow