Upper Horse Flats
Flat in San Juan County, Utah · on the USGS Black Steer Canyon quadrangle
37.79610, -110.07402
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Black Steer Canyon, UT
USGS topo, 2023
Mouth of Dark Canyon, UT
USGS historical 15-minute topo (1952)
IFR Enroute Low Altitude Chart L-09 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-11 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-04 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-03 (U.S.)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).