Larch Mountain Road: The Corbett Climb
14 miles from the fork near Corbett to the Larch Mountain picnic area and trailhead, the highest road in Multnomah County's jurisdiction at 4,055 ft. Narrow in places with limited visibility, and heavily used by road cyclists.
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Closed every winter and spring, typically reopening in May and closing again in late November — exact dates depend on snow, not a fixed calendar. Check current access · Reviewed 2026-09-23
Planning the drive
This climbs from the fork near Corbett to 3,860 ft at our own measured high point, on the way to the Larch Mountain picnic area and trailhead — the highest road under Multnomah County's jurisdiction. 35 counted bends and 6 switchbacks over 14.1 miles at a 6.4% maximum grade, narrow in places with genuinely limited visibility around blind corners. Multnomah County: Larch Mountain Road
Road cyclists use this climb heavily, so expect to share the full width of the road on weekends. It closes every winter and spring, typically reopening in May and closing again around late November — exact dates depend on snowfall, not a fixed calendar.
Roads to connect
- Historic Columbia River Highway · US 30 HistoricThe Corbett fork is a short distance from the Historic Highway's waterfall corridor — a completely different kind of driving nearby.
Driving notes updated .
Road shape
- Length
- 14.1 mi
- Bends
- 35
- Switchbacks
- 6
- Bends per mile
- 2.5
- Turning per mile
- 276°
- Curviest rank
- 114of 165
Measured from the OpenStreetMap centreline at a 20 m sampling step — road shape only, not a safety or speed judgement. How bends are counted.
Elevation
- Total climb
- 3,179ft
- Climb per mile
- 225ft
- Highest point
- 3,860ft
- Steepest grade
- 6.4%
Sampled every 100 m from USGS 10 m elevation data, a public-domain federal dataset. Total climb counts vertical change in both directions, so it does not depend on which way you drive. How elevation is measured.
Speed limits
Varies
Unverified
Check posted signs along the road.
No reliable posted limit was found for this selected section. Follow current signs.
Posted signs always govern. How speed evidence is handled.
Sources
Difficulty 2/3 (Winding) is our editorial rating of width, bends and sightlines; “Technical” describes character, not a target speed. Full method. Identified from:
- Multnomah County: Larch Mountain Road
- Wikipedia: Larch Mountain (Multnomah County, Oregon)
- OpenStreetMap road data (7 ways in this trace)
Reviewed 2026-09-23. The trace shows selected road sections, not a navigation route.
Roads nearby
Distances are approximate straight lines between road centers, not driving distances or direct connections.