Apple Maps Google Maps gravel route Northern Half of Dirty Buff Ride bike gravelmap.com 45.1 km 629 m gain
Apple Maps Google Maps gravel segment Somerset Trail to Niwot Loop bike gravelmap.com 2.4 km 71 m gain
Apple Maps Google Maps dirt segment East Boulder - Gunbarrel Trail bike gravelmap.com 2.7 km 118 m gain
