Mount Umunhum Road
A summit-access road with tight turns and broad valley views. Preserve opening hours apply.
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Road shape
- Length
- 5.4 mi
- Bends
- 56
- Switchbacks
- 10
- Bends per mile
- 10.3
- Turning per mile
- 1131°
- Curviest rank
- 5of 85
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
- 2,206ft
- Climb per mile
- 409ft
- Highest point
- 3,457ft
- Steepest grade
- 12.5%
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
25 mph
Published limits
Lower speeds may be needed at bends. Follow posted signs.
Midpen’s 2016 road rehabilitation sign plan specifies 25 mph signs. Current signs take precedence.
Posted signs always govern. How speed evidence is handled.
Sources
Difficulty 3/3 (Demanding) is our editorial rating of width, bends and sightlines; “Low speed” describes character, not a target speed. Full method. Identified from:
- r/Touge · Bay Area drives ↗
- OpenStreetMap road data ↗ (7 ways in this trace)
Reviewed 2026-09-08. The trace shows selected road sections, not a navigation route.