Blackford Lake
Reservoir in Nodaway County, Missouri · on the USGS Hopkins SW quadrangle
40.55018, -94.87523
Maps that show Blackford Lake
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Hopkins SW, MO-IA
USGS topo, 2021

New Market, IA
USGS historical 15-minute topo (1940)

New Market, IA
USGS historical 15-minute topo (1943)

Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)

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 High Altitude Chart H-05 (U.S.)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).