Mount Baldy Road
The approach up San Antonio Canyon from the Claremont boundary to the Glendora Ridge junction, below the ski-area ascent.
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No current opening claim established for the complete proposed segment. Check current access ↗ · Reviewed
Road shape
- Length
- 8 mi
- Bends
- 17
- Switchbacks
- 0
- Bends per mile
- 2.1
- Turning per mile
- 184°
- Curviest rank
- 77of 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
- 2,606ft
- Climb per mile
- 326ft
- Highest point
- 4,195ft
- Steepest grade
- 10.5%
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
Varies
Documented sections
Documented only where scoped: 35 mph (Glendora Ridge Road to Mountain Avenue; August 12, 2025 order); 45 mph (Mountain Avenue to defined Claremont boundary; August 12, 2025 order). These sections do not cover the whole selected trace and have not been checked against current signs.
Documented only where scoped: 35 mph (Glendora Ridge Road to Mountain Avenue; August 12, 2025 order); 45 mph (Mountain Avenue to defined Claremont boundary; August 12, 2025 order). These sections do not cover the whole selected trace and have not been checked against 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; “Medium speed” describes character, not a target speed. Full method. Identified from:
- Los Angeles County Board of Supervisors / Public Works · Traffic regulations, adopted August 12, 2025 ↗
- OpenStreetMap road data ↗ (18 ways in this trace)
Reviewed 2026-09-09. The trace shows selected road sections, not a navigation route.