Grazing is a major contributor to nonpoint source pollution on the reservation.
Most grazing units follow waterways because livestock are dependent on the streams for their water supplies. The demonstration of a managed grazing system, a section 319 project, is underway as a first phase of a full-scale water quality protection plan for the reservation. The system will be demonstrated in the Little Porcupine Creek watershed, which is used for grazing from summer through fall. Approximately 80 percent of the watershed is native rangeland which produces approximately 0.25 animal unit months per acre. Generally the livestock are unconfined and tend to concentrate in the riparian areas in the heat of the summer.