Otter Lake
Reservoir in Macoupin County, Illinois · on the USGS Palmyra quadrangle
39.40983, -89.91088
Maps that show Otter Lake
Get them in the map app
Palmyra, IL
USGS topo, 2024
Carlinville, IL
USGS historical 15-minute topo (1925)
Carlinville, IL
USGS historical 15-minute topo (1931)
Network to Freedom Brochure Map - National Underground Railroad Network to Freedom Program
National Park Service Maps (public domain) · National Underground Railroad Network to Freedom Program
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Enroute Low Altitude Chart L-27 (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).