Onion Ridge
Ridge in Ferry County, Washington · on the USGS Sitdown Mountain quadrangle
48.45008, -118.38259
Maps that show Onion Ridge
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Sitdown Mountain, WA
USGS topo, 2023
Twin Lakes, WA — USGS historical 15-minute topo (1952)
USGS Historical Topo Maps (public domain) · Washington
Motor Vehicle Use Map (MVUM) — Southwest of the Forest — Colville National Forest (2025)
Forest Service Maps (public domain) · Colville National Forest
IFR Enroute Low Altitude Chart L-13 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
IFR Enroute High Altitude Chart H-01 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
IFR Enroute Low Altitude Chart L-01 (Alaska) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).