The Upper Truckee River watershed is the largest in the Tahoe Basin, draining more than 54 square miles. Urbanization has disturbed its natural ability to filter pollutants before they make their way into Lake Tahoe. The Upper Truckee River Watershed Restoration Project is a large-scale, collaborative effort on the part of local, state, and federal agencies and private property owners to restore the natural channels and floodplains of the watershed, improve river and stream habitat, fish migration, and significantly reduce about two-thirds of the total volume of sediment currently reaching Lake Tahoe. Other elements of the project are to improve recreational access along the Upper Truckee River corridor.