Casci 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 Casci Road climb?

3.8 miles (6.1 km) at 5.2% on average, climbing 1,030 ft (314 m) from 3,084 ft to 4,114 ft. The steepest half kilometre averages 11.6%. That makes it a Category 3 climb.

Where does the climb start and finish?

It starts at 39.28507, -120.91207, and tops out on the road at 39.31832, -120.88955.

Is Casci 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.

• Red Dog Road near Nevada CityCat 2 · 3.5 mi at 6.1% · 1,132 ft · starts 4.3 mi away
• Willow Valley RoadCat 2 · 3.1 mi at 6.7% · 1,109 ft · starts 4.9 mi away
• North Bloomfield-Graniteville Road near Nevada CityCat 2 · 2.5 mi at 8.9% · 1,161 ft · starts 5.0 mi away
• Chalk Bluff RoadCat 1 · 12 mi at 3.5% · 2,119 ft · starts 5.1 mi away
• Red Dog Road from Boulder StreetCat 3 · 3.8 mi at 5% · 1,007 ft · starts 5.3 mi away
• Jones Ridge RoadCat 3 · 2.2 mi at 7.2% · 853 ft · starts 5.5 mi away
• Banner Mountain TrailCat 3 · 2.5 mi at 4.2% · 551 ft · starts 5.5 mi away
• North Bloomfield-Graniteville Road near Nevada CityCat 1 · dirt · 8.8 mi at 4.7% · 2,175 ft · starts 5.7 mi away