The Trinity Unit (Trinity and Lewiston Lakes) of the Shasta-Trinity National Recreation area encompasses four subunits: Lewiston Lake, Trinity Dam, Stuart Fork and North Lake areas. Trinity Lake, when full, has 145 miles of shoreline with many boating options.  Trinity Lake dam is one of the highest earth filled dams in the world. Lewiston Lake lies just downstream from Trinity Dam and just north of the town of Lewiston and is a constant level lake. Both Trinity Lake and Lewiston Lake have excellent fishing, camping, and trails.