Detective Jeremiah MacKay Memorial Highway Climb
- long (42.3 km)
- 26 mi
- long (42.3 km)
- of climbing (1,560 m)
- 5,118 ft
- of climbing (1,560 m)
- average grade
- 3.7%
- average grade
- steepest 500 m
- 8.3%
- steepest 500 m
Elevation profile
From 1,519 ft at the bottom to 6,637 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 Detective Jeremiah MacKay Memorial Highway this week
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Is it safe to bike up Detective Jeremiah MacKay Memorial Highway?
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: 7 bike crashes were reported on or beside Detective Jeremiah MacKay Memorial Highway along the climb from 2021–2025, 5 of them serious or fatal (1 fatal). Of the 6 where the cyclist's direction along the climb can be read, 5 were coming down and 1 going up.
Common questions about Detective Jeremiah MacKay Memorial Highway
- How long and steep is the Detective Jeremiah MacKay Memorial Highway climb?
- 26 miles (42.3 km) at 3.7% on average, climbing 5,118 ft (1,560 m) from 1,519 ft to 6,637 ft. The steepest half kilometre averages 8.3%. That makes it a Hors catégorie climb.
- Where does the climb start and finish?
- It starts at 34.07007, -117.15291, where Detective Jeremiah MacKay Memorial Highway leaves East Lugonia Avenue, and tops out on the road at 34.17315, -116.85504.
- Is Detective Jeremiah MacKay Memorial Highway 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.
Other climbs nearby
- Church StreetCat 3 · 1.8 mi at 5.7% · 535 ft · starts 3.0 mi away
- Cloverhill DriveCat 3 · 1.9 mi at 6.8% · 669 ft · starts 3.3 mi away
- Smiley BoulevardCat 2 · 3.6 mi at 5.9% · 1,102 ft · starts 4.3 mi away
- Avenue ECat 3 · 4.4 mi at 4.3% · 997 ft · starts 4.8 mi away
- Oak Glen Road from Yucaipa BoulevardCat 1 · 9.0 mi at 5.5% · 2,615 ft · starts 5.2 mi away
- Steve Faris Memorial HighwayHC · 24 mi at 4.3% · 5,456 ft · starts 5.6 mi away
- Wildwood Canyon RoadCat 2 · 6.6 mi at 4.2% · 1,460 ft · starts 5.9 mi away
- Carter StreetCat 3 · 2.6 mi at 6% · 814 ft · starts 6.6 mi away
Bike crash hotspots nearby
Found from OpenStreetMap roads and USGS 3DEP elevation; ranked on shape only. Hors catégorie: 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.