Mouse Hole is a technical Class III rapid characterized by a constricted channel with multiple large boulders creating complex hydraulics and requiring precise boat positioning. Paddlers must navigate a series of tight, offset drops with potential undercut rocks on river right, demanding strong eddy turns and quick maneuvering to avoid potential pin or broach hazards. The rapid's namesake features a narrow, partially blocked passage that can create recirculating holes during medium to high water levels, making careful line selection critical for safe passage.