Somersville Road Climb
- long (7.3 km)
- 4.5 mi
- long (7.3 km)
- of climbing (320 m)
- 1,050 ft
- of climbing (320 m)
- average grade
- 4.4%
- average grade
- steepest 500 m
- 11.4%
- steepest 500 m
Elevation profile
From 56 ft at the bottom to 1,106 ft at the top. Grades are averaged over each half kilometre, from USGS elevation data, so short ramps can be steeper than they show.
Weather at the top of Somersville Road this week
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Is it safe to bike up Somersville Road?
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. The records here are also incomplete: most reports along it are filed under Pittsburg, where only 34% of reported bike crashes have a map location, so the numbers here are too low. What the records show: 1 bike crash was reported on or beside Somersville Road along the climb from 2021–2025.
Common questions about Somersville Road
- How long and steep is the Somersville Road climb?
- 4.5 miles (7.3 km) at 4.4% on average, climbing 1,050 ft (320 m) from 56 ft to 1,106 ft. The steepest half kilometre averages 11.4%. That makes it a Category 3 climb.
- Where does the climb start and finish?
- It starts at 38.00442, -121.83693, where Somersville Road leaves Auto Center Drive, and tops out at Nortonville Pass at 37.95618, -121.87431.
- Is Somersville Road paved?
- Mostly: OpenStreetMap tags 85% of the climb as paved, and the rest as dirt or gravel.
- 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.
Other climbs nearby
- Railroad AvenueCat 3 · 5.2 mi at 3.4% · 938 ft · starts 3.1 mi away
- Bailey RoadCat 3 · 2.8 mi at 4.4% · 663 ft · starts 5.9 mi away
- Kirker Pass RoadCat 3 · 2.0 mi at 6.3% · 650 ft · starts 7.3 mi away
- Morgan Territory Road near ClaytonCat 2 · 8.9 mi at 3.1% · 1,453 ft · starts 7.7 mi away
- Royal Oaks DriveCat 3 · 1.0 mi at 13.8% · 715 ft · starts 8.3 mi away
- Summit Road from North Gate RoadCat 2 · 4.4 mi at 7% · 1,647 ft · starts 11 mi away
- North Gate RoadCat 2 · 7.7 mi at 4.9% · 1,965 ft · starts 11 mi away
- Burma Road from Stage RoadCat 1 · dirt · 4.3 mi at 9.2% · 2,103 ft · starts 12 mi away
Bike crash hotspots nearby
Found from OpenStreetMap roads and USGS 3DEP elevation; ranked on shape only. Category 3: 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. Crashes: bike crashes reported within 100 ft of the climb, 2021–2025, from the California Crash Reporting System (CCRS), counted only where the report has map coordinates. Weather: National Weather Service. Access from OpenStreetMap tags; obey posted signs. How the data works.