The Little Truckee River originates as the outflow from Webber Lake, a natural lake, in the Sierra Nevada north of Donner Summit. It is a substantial stream by the area’s standards and even has a couple of reservoirs in its lower reaches. In particular, it is the largest tributary to the main stem of the Truckee River. The Truckee in turn flows east into Nevada and is the primary water source for Reno and much of western Nevada. The Truckee itself ends at Pyramid Lake. It’s less than a mile…