Topographic maps are available at many outdoor and blueprint stores, and from the U.S. Geological- Survey, Branch Distribution, Federal Center, Denver, CO 80225. Preparation Visitors should be prepared for extremes of heat and cold. Carry a good tent. Use sunscreen and hats and seek shelter from midday heat. However, the streams are also used and trampled by cattle and wildlife, so all water should be treated with a filter.
Giardia parasites are present in most western streams.
Drinking unfiltered water can cause stomach cramps with possible future complications. Some stretches of trail stay high on the hillside and away from water sources for several miles. As a rule of thumb.