Hopland Grade · Hwy 175
Highway 175 from US 101 in Hopland to Highway 29 south of Lakeport, including the tight, winding Hopland Grade crossing. The mountain bends give way to more settled roads near either end.
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Caltrans reported construction traffic control west of the Mendocino/Lake county line when reviewed September 13, 2026. Check the current report for delays before crossing. Check current access ↗ · Reviewed 2026-09-13
Road shape
- Length
- 17.6 mi
- Bends
- 99
- Switchbacks
- 13
- Bends per mile
- 5.6
- Turning per mile
- 591°
- Curviest rank
- 48of 135
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
- 3,489ft
- Climb per mile
- 198ft
- Highest point
- 2,481ft
- Steepest grade
- 7.3%
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.
Limits vary by section. Follow posted signs.
Posted signs always govern. How speed evidence is handled.
Sources
Difficulty 3/3 (Demanding) is our editorial rating of width, bends and sightlines; “Technical” describes character, not a target speed. Full method. Identified from:
- Caltrans · Hopland Grade is on Route 175 ↗
- Caltrans · Highway 175 conditions ↗
- OpenStreetMap road data ↗ (15 ways in this trace)
Reviewed 2026-09-13. 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.