Ultra Flag with Sugar on Top

Flagstaff? Super Flag? No, It's Ultra Flag!
Gross Dam Road is unpaved, as is the top of Sugarloaf. I have seen racing bikes on both. 48 miles.
  1. Boulder
  2. Gross Reservoir
  3. Crescent Village
  4. Coal Creek Canyon & Peak to Peak Highway
  5. Peak to Peak Highway & Sugarloaf
  6. Sugarloaf & Boulder Canyon
  7. Boulder
You may wish to finish on the Boulder Creek Path and Arapahoe Avenue instead of taking Boulder Canyon all the way into town.
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