The Keyhole
Arch in Larimer County, Colorado · on the USGS Masonville quadrangle
40.42306, -105.16250
Maps that show The Keyhole
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Masonville, CO
USGS topo, 2022
Loveland, CO
USGS historical 15-minute topo (1906)
Loveland, CO
USGS historical 15-minute topo (1908)
IFR Enroute Low Altitude Chart L-10 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-12 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-09 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-05 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-03 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-01 (U.S.)
FAA, 2026-10-29
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).