After "Scout" and the standing waves below "Scout", there’s a large rectangular boulder in the middle of the river. "Hydro Rock" is run by pointing the boat at “2:00” in front of this boulder. Depending on levels, there can be a standing wave in the middle of the drop and a nice-size hole at the bottom that can be a little sticky, followed by a large pool after the rapid. These two features can provide some of the best play-boating on the river between 4.75' (1,500 cfs) and 6.00' (3,000 cfs) on the USGS Ferndale Gauge.
Rapid
III+
Rapid
III
Rapid
III
Rapid
III
Rapid
III
Rapid
III
Rapid
III
Hazard
N/A
Hazard
III