Milliken Avenue 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. The records here are also incomplete: most reports along it are filed under Rancho Cucamonga, where only 5% 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 Milliken Avenue along the climb from 2021–2025.

How long and steep is the Milliken Avenue climb?

3.4 miles (5.4 km) at 3.3% on average, climbing 597 ft (182 m) from 1,211 ft to 1,808 ft. The steepest half kilometre averages 5%. That makes it a Category 3 climb.

Where does the climb start and finish?

It starts at 34.10672, -117.55712, where Milliken Avenue leaves Foothill Boulevard, and tops out at Wilson Avenue at 34.15059, -117.56445.

Is Milliken Avenue 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.

• Day Creek BoulevardCat 3 · 3.2 mi at 3.2% · 528 ft · starts 1.2 mi away
• Haven Avenue from Acacia StreetCat 3 · 4.2 mi at 3.3% · 748 ft · starts 1.5 mi away
• Hermosa AvenueCat 3 · 5.4 mi at 3.5% · 1,014 ft · starts 2.1 mi away
• Haven Avenue near Rancho CucamongaCat 2 · 3.3 mi at 7.5% · 1,322 ft · starts 2.3 mi away
• Amethyst AvenueCat 3 · 2.8 mi at 5% · 738 ft · starts 2.6 mi away
• Hellman AvenueCat 3 · 4.5 mi at 3.5% · 823 ft · starts 2.7 mi away
• Carnelian StreetCat 3 · 3.6 mi at 4.5% · 863 ft · starts 3.2 mi away
• Beryl StreetCat 3 · 3.3 mi at 4.3% · 755 ft · starts 3.2 mi away