Operator reports he was traveling up-river between Castle Rocks and the Black Mesa Pump Station. Operator lost power when he ran his vessel aground on a gravel bar. When the vessel  came off the gravel bar the vessel drifted down river. The vessel struck a large rock formation at Castle Rock, turned sideways and became lodged on the rocks. The impact with the rocks caused a hole in the aluminum hull. No one was injured.
King Hill