Fir Tree Spring
Spring in Grant County, Oregon · on the USGS Knox Mountain quadrangle
44.07738, -118.42894
Maps that show Fir Tree Spring
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Knox Mountain, OR — USGS 7.5-minute topo (2023)
USGS Topo Maps (public domain) · Oregon
Public domain
Flag Prairie, OR — USGS historical 15-minute topo (1970)
USGS Historical Topo Maps (public domain) · Oregon
Public domain
IFR Enroute Low Altitude Chart L-11 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute Low Altitude Chart L-13 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute High Altitude Chart H-03 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute High Altitude Chart H-01 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute Low Altitude Chart L-01 (Alaska) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
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Name, class, county and location: USGS Geographic Names Information System (public domain).