Fishing within 200 yards downstream of Crystal Dam is prohibited. The East Portal Road is closed in winter. Anglers seeking a more secluded experience can hike one of the inner-canyon routes. Due to the steep, rocky terrain, these extremely difficult scrambles should only be attempted by those in excellent physical condition. A free backcountry permit is required , and can be obtained at the South Rim Visitor Center or the North Rim Ranger Station.
More detailed information is available about the inner canyon routes .