Al Helenberg Memorial Boat Ramp in Castle Rock provides a two-lane paved boat launch with floating docks and parking facilities for accessing the Cowlitz River.

The ramp is located approximately 1,300 feet upstream of the Highway 411 Bridge and serves both motorized and non-motorized watercraft, though users should be aware that significant sediment accumulation occurs seasonally, particularly during high water events, which may affect water depth at the launch.