Thomas Road Climb near Rio Dell

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 Thomas Road near Rio Dell climb?

2.9 miles (4.6 km) at 7.1% on average, climbing 1,070 ft (326 m) from 1,371 ft to 2,441 ft. The steepest half kilometre averages 12.8%. That makes it a Category 2 climb.

Where does the climb start and finish?

It starts at 40.22747, -123.94495, and tops out on the road at 40.2204, -123.9555.

Is Thomas 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.

• Salmon Creek Road near Rio DellCat 3 · 0.7 mi at 15.2% · 568 ft · starts 1.8 mi away
• Salmon Creek Road near Rio DellCat 3 · 2.3 mi at 6% · 719 ft · starts 1.9 mi away
• Thomas Road near Rio DellCat 3 · 1.2 mi at 11.8% · 748 ft · starts 1.9 mi away
• Salmon Creek Road near Rio DellCat 3 · 1.5 mi at 11.8% · 919 ft · starts 2.1 mi away
• East Fork RoadCat 3 · 2.0 mi at 9% · 965 ft · starts 2.7 mi away
• Thomas Road near Rio DellCat 2 · 2.5 mi at 9.6% · 1,247 ft · starts 2.9 mi away
• Grenz LaneCat 2 · 0.9 mi at 23.2% · 1,073 ft · starts 3.9 mi away
• East ForkCat 3 · 1.4 mi at 9.7% · 735 ft · starts 4.4 mi away