Seneca Road Climb
- long (6.1 km)
- 3.8 mi
- long (6.1 km)
- of climbing (387 m)
- 1,270 ft
- of climbing (387 m)
- average grade
- 6.4%
- average grade
- steepest 500 m
- 10%
- steepest 500 m
Elevation profile
From 3,583 ft at the bottom to 4,852 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 Seneca Road this week
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Is it safe to bike up Seneca 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. What the records show: no bike crashes were reported along the climb from 2021–2025.
Common questions about Seneca Road
- How long and steep is the Seneca Road climb?
- 3.8 miles (6.1 km) at 6.4% on average, climbing 1,270 ft (387 m) from 3,583 ft to 4,852 ft. The steepest half kilometre averages 10%. That makes it a Category 2 climb.
- Where does the climb start and finish?
- It starts at 40.11378, -121.08408, and tops out on the road at 40.14917, -121.09467.
- Is Seneca Road paved?
- Mostly: OpenStreetMap tags 94% 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
- Prattville Butt Reservoir RoadCat 3 · 3.2 mi at 3.7% · 627 ft · starts 5.6 mi away
- Old Haun RoadCat 2 · 4.1 mi at 5.1% · 1,119 ft · starts 6.2 mi away
- Rush Creek RoadCat 2 · 2.3 mi at 9% · 1,112 ft · starts 6.5 mi away
- Round Valley Road from Hideaway RoadCat 3 · 3.5 mi at 4.9% · 902 ft · starts 7.0 mi away
- Butterfly Valley Twain RoadCat 2 · 3.2 mi at 6.9% · 1,165 ft · starts 7.2 mi away
- Old Haun Road from Greenville Wolf Creek RoadCat 3 · 2.4 mi at 6.4% · 810 ft · starts 7.2 mi away
- Standart Mine RoadCat 3 · 1.6 mi at 12.3% · 1,014 ft · starts 8.0 mi away
- Dixie Canyon-Round Valley-Long RoadCat 3 · 1.7 mi at 11.3% · 1,020 ft · starts 8.2 mi away
Found from OpenStreetMap roads and USGS 3DEP elevation; ranked on shape only. Category 2: 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.