Costilla Tank
Reservoir in Frio County, Texas · on the USGS Derby quadrangle
28.86283, -99.22488
Maps that show Costilla Tank
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Derby, TX
USGS topo, 2022
Pearsall, TX
USGS historical 15-minute topo (1927)
U.S. Fish and Wildlife Service Alligator Snapping Turtle Range (2024)
Fish & Wildlife Service Refuge Maps (public domain)
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Enroute Low Altitude Chart L-20 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-19 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-07 (U.S.)
FAA, 2026-10-29
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).