Porphyry Basin
Basin in San Juan County, Colorado · on the USGS Ironton quadrangle
37.88722, -107.74978
Maps that show Porphyry Basin
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Ironton, CO
USGS topo, 2023
Silverton, CO
USGS historical 15-minute topo (1897)
Silverton, CO
USGS historical 15-minute topo (1901)
Silverton, CO
USGS historical 15-minute topo (1902)
Silverton, CO
USGS historical 15-minute topo (1955)
Columbine District Motor Vehicle Use Map (MVUM)
San Juan National Forest (2026)
Mountain Division Motor Vehicle Use Map (MVUM)
Grand Mesa, Uncompahgre and Gunnison National Forests (2025)
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
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).