Willamette National Forest · Oregon

O Leary Mountain

8.5 mi of trail, end to end · about 3,900 ft of climbing · 2,186 ft–5,114 ft · native material surface · trail No. 3321 · trail class 3 · typical grade 12-20% · tread 12-18 inches wide · hiking, bike

2,186 ft 4,907 ft · 8.4 mi high 5,098 ft

Trailhead O'Leary / Castle Rock Trailhead 2,178 ft Drive there

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About this trail's facts

The lines are the US Forest Service's National Forest System trails layer (public domain), read 2026-10-16 and simplified for the map; the length is the line's, end to end, and the class, surface, grade and tread width are the forest's own entries where it publishes them - a forest that publishes the centreline alone has none. The trailheads and the points along the way are the Service's recreation points, and the write-ups its own recarea text, unedited. Heights come from USGS 3DEP through Terrain Tiles on AWS (Mapzen/Tilezen), read along each line and rounded; a short trail on steep ground can be off by a few tens of feet. Closures change: check the forest's own site before you go.