Douglas Ingram Ridge

Oss Peak, WA

Detailed map of terrain, trails and roads

USGS topo, 2023

Oss Peak

Forest Service topo with road numbers

Forest Service FSTopo 7.5-minute quad

Twisp 30x60 Land Ownership (BLM Surface Management)

Land Ownership Maps from BLM Data · Washington

Okanogan-Wenatchee National Forest

Forest Service forest map

Treaty Map - Whitman Mission National Historic Site

National Park Service Maps · Whitman Mission National Historic Site

IFR Enroute Low Altitude Chart L-01 (U.S.)

FAA, 2026-10-29

IFR Enroute Low Altitude Chart L-13 (U.S.)

FAA, 2026-10-29

IFR Enroute High Altitude Chart H-01 (U.S.)

FAA, 2026-10-29

IFR Enroute Low Altitude Chart L-01 (Alaska)

FAA, 2026-10-29