The South Branch is a clear stream, quite wide, and of considerable depth in many places. Watering the Valley, the river abounds in fish and creates many picturesque settings. At times the usually calm waters surge from low banks and spread over the Valley, enveloping and ravishing the rich surrounding lands. The river has a peculiar feature in the field of geology as it flows through the Valley. At one point the river, thousands of years ago, did not cut across the mountains from one side to the other, but made a passage through them from end to end. This geological exception is now in the form of a narrow, trough-like gap, about long, and appropriately called "The Trough". At the present day, the gorge is several hundred feet deep, and the South Branch flows in a narrow channel at the bottom, with almost perpendicular walls of rock on either side.