San Juan County is located in the far south-eastern portion of Utah within
the Colorado Plateau along the Colorado and Arizona borders. It is the largest
county in Utah and the second largest in the United States with approximately
7,884 mi2 or 5.2 million acres. Some of the more famous attractions within San
Juan County are Canyonlands National Park, Lake Powell, Four Corners area and
the Navajo Indian Reservation. The majority of the land (approx. 72%) is
administered by federal and tribal agencies. Land ownership/administration
within San Juan County is broken down as follows (acres, % of total): BLM
2,074,247, 41%; Indian Reservation 1,220,846, 23%; National Parks Service
587,375, 10%; U.S.F.S 450,549, 9%; State of Utah 406,415, 8%; Private 406,367,
8%, and Private Indian Trust Funds 25,117, 1%.
Summer precipitation patterns are typical for the south west with monsoonal
storms, with heavier snow accumulations within the higher elevations during the
winter months. The average growing season is June 1 through October 1, with
slightly longer periods in the lower elevations. The average annual
precipitation within the County is between 6 and 22 in yr-1.