I have found out how to get detailed maps of BLM land. The illustration below is for Utah.
° Statewide plotted maps available, call for price information
° $4.00 Surface Management Quads (1:100,000) 27″x44″
° U.S. Geological Survey Topographic Maps http://topomaps.usgs.gov/
Bureau of Land Management
Utah Public Room
Utah State Office
PO Box 45155
Salt Lake City, Utah 84145
(Street Address: 440 West 200 South, Suite 500)
Phone: (801) 539-4001
Hours: 7:45a.m. to 4:30 p.m.
I use Delorme maps, but this link to the BLM lands really fine tunes the location for boondocking. Do you use a specific kind of map?