Nine-mile-long Baker Lake was created by the Upper Dam on the Baker River; the Lower Baker Dam created Lake Shannon, just off Highway 20 near Concrete [1].
Baker Lake is very popular with campers, swimmers, motor boaters, and water-skiers, despite the enormous stumps that lurk just below the water’s surface. To get there, take Baker Lake-Grandy Lake Road north from Highway 20.
Get to 100-foot-high Rainbow Falls by driving 20 miles out Baker Lake Road, and then another five miles up Forest Road 1130. The name comes from the rainbow that appears at the base on sunny days.
Links:
[1] http://www.moon.com/destinations/washington/north-cascades/north-cascades-highway/concrete