Osprey Trailhead


Located on the south shore of Gross Reservoir, Osprey Trailhead provides access to the Inlet Trail.

Gross Reservoir is managed by Denver Water. Please visit their website for regulations and additional information.

At a Glance

Usage: Light
Best Season: May - October
Restrictions: Non-motorized uses only. This area is subject to regulations established by Denver Water Board. Denver Water does not allow overnight parking. Fishing is permitted in accordance with regulations established by the Colorado Parks & Wildlife.
Closest Towns: Boulder, Colorado
Water: Gross Reservoir; treat water for drinking.
Restroom: Practice Leave No Trace principles
Operated By: U.S. Forest Service
Information Center: Boulder Ranger District, 2140 Yarmouth Ave, Boulder, CO 80301, Phone 303-541-2500, Fax 303-541-2515; Contact Us

General Information

Directions: From Boulder, head west on Baseline Road. The road name changes to Flagstaff Road as it climbs up the mountain. After 8.6 miles, turn left onto Gross Dam Road and follow it as it heads down into the canyon and across South Boulder Creek. Turn right onto Denver Water Board Road and follow signs for Osprey Trailhead.



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Day Hiking