Inlet Trail


The Inlet Trail traverses west across the steep ridge south of Gross Reservoir and below the railroad tracks. This one-mile trail leads from Osprey Point Trailhead to Gross Reservoir's inlet at South Boulder Creek.

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

At a Glance

Operational Hours: The land on the east side of Gross Reservoir and the reservoir itself is owned and operated by Denver Water. They do not allow overnight parking. 
Usage: Light
Restrictions: Motorized vehicles prohibited. This area is subject to regulations established by Denver Water Board. Fishing: permitted in accordance with regulations established by the Colorado Parks & Wildlife.
Closest Towns: Boulder, Colorado
Water: Lakes and streams; 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

Fire InformationUnless seasonal restrictions are in effect, campfires must be attended at all times and cold to the touch with the bare hand before being abandoned. Collection of dead and down wood is allowed; do not break branches from standing trees for firewood.
Difficulty Level: Intermediate

Related Information

Areas & Activities


  Area/Length : 
1 mile (One-way)

  Elevation : 
7,200' - 7,500'