Do not wash with soap in streams or rivers. Carry out all refuse. This is an intestinal disease caused by a protozoan called giardia. Giardia is carried by humans and other animals and can contaminate water supplies. A reliable treatment for giardia is to filter, chemically treat, or boil 1 minute at sea level and at higher elevations boil 5-10 minutes.
Some areas have group sites, inquire at the ranger station.
When encountering stock parties, stand on the downhill side of animals and converse in normal voice with rider. Stock parties have the right of way. Boulder Creek from the gate at the trailhead to the Boulder Creek camping area is open to the use of bicycles. Pellets and rolled grain are required for supplemental stock feed. A maximum of eight animals per group is allowed.