Impounding Basin Number Twenty-One
Basin in Montgomery County, Pennsylvania · on the USGS Valley Forge quadrangle
40.10455, -75.46186
Maps that show Impounding Basin Number Twenty-One
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Valley Forge, PA
Detailed map of terrain, trails and roads
USGS topo, 2023
Norristown, PA
Old map for history, not navigation
USGS historical 15-minute topo (1894)
Norristown, PA
Old map for history, not navigation
USGS historical 15-minute topo (1895)
Norristown, PA
Old map for history, not navigation
USGS historical 15-minute topo (1896)
Norristown, PA
Old map for history, not navigation
USGS historical 15-minute topo (1943)
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Area Chart A-01 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-33 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-36 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-34 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-32 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-11 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-10 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-12 (U.S.)
FAA, 2026-10-29
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).