Clark Valley Road Climb

We don't rate roads as safe or unsafe: crash counts can't say how risky a ride is, and roads people like to ride draw more riders, so they see more crashes. What the records show: no bike crashes were reported along the climb from 2021–2025.

How long and steep is the Clark Valley Road climb?

3.3 miles (5.4 km) at 3.5% on average, climbing 623 ft (190 m) from 315 ft to 938 ft. The steepest half kilometre averages 10.5%. That makes it a Category 3 climb.

Where does the climb start and finish?

It starts at 35.28592, -120.79774, and ends where the road ends at 35.27356, -120.7544.

Is Clark Valley Road paved?

Yes, by its OpenStreetMap tags.

How is the category worked out?

From the climb's shape only: length in metres × average grade (%) of 16,000 or more for Cat 3, 32,000 for Cat 2, 64,000 for Cat 1 and 80,000 for HC. It describes how hard the climb is, not traffic or crashes.

Where does this data come from?

The climb is found from OpenStreetMap roads and USGS 3DEP elevation (every climb, not a list of famous ones). Access is from OpenStreetMap tags; gates and closures change, so obey posted signs. Crash counts are police reports in the California Crash Reporting System (CCRS) on data.ca.gov, counted where their map location is within 100 ft of the climb. The forecast is from the National Weather Service.

• Happy Trails RoadCat 3 · 1.0 mi at 10.7% · 561 ft · starts 3.9 mi away
• San Bernardo Creek RoadCat 3 · 5.2 mi at 3.6% · 974 ft · starts 5.3 mi away
• Prefumo Canyon RoadCat 2 · 5.0 mi at 4.3% · 1,142 ft · starts 5.5 mi away
• Skyview TrailCat 3 · 0.6 mi at 18.6% · 545 ft · starts 7.2 mi away
• See Canyon RoadCat 2 · 7.4 mi at 3.2% · 1,263 ft · starts 7.7 mi away
• Baron Canyon Ranch RoadCat 3 · 1.3 mi at 10.5% · 702 ft · starts 8.0 mi away
• El Camino Real from Fox Hollow RoadCat 2 · 4.3 mi at 5% · 1,122 ft · starts 9.2 mi away
• Toro Creek Truck TrailCat 3 · 1.0 mi at 10.8% · 587 ft · starts 11 mi away