Forsythe Canyon Trail (#852)

Length: Forsythe Canyon Trailhead (TH) to trail intersection with CR 68J - 1.6 miles

Elevation: 7,337 feet at TH; 7,837 feet at CR 68J

Trail Description: Forsythe Canyon Trail is a non-motorized hiking trail near Gross Reservoir. From the Forsythe Canyon Trailhead, walk downhill from the parking area. The trail begins near the gate on National Forest System Road 359.

Forsythe Canyon Trail leads off of a rocky point, following Forsythe Creek down its wooded, rocky canyon. The small creek runs noisily in spring, forming small, picturesque waterfalls and cascades finally ending at the far northwestern tip of Gross Reservoir.

Camping in this area is restricted to the designated campsites along National Forest System Road 359.

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

View a trail map here.

At a Glance

Usage: Medium
Best Season: Accessible year round
  • In this area, dispersed camping outside of a designated Forest Service campsite is prohibited. See Order.
  • Motorized and mechanized vehicles are prohibited.
  • Practice Leave No Trace principles.
Fishing and hunting are allowed 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

General Information


From Boulder, head west on Canyon Boulevard, (Colorado Highway 119) for four miles and turn southwest onto Magnolia Road (County Road 132). Continue on Magnolia Road for 6.6 miles and turn southeast onto County Road 68. Follow CR 68 for two miles and turn southeast onto National Forest System Road 359.


Mountain Biking

Forsythe Canyon Trail is a short segment of singletrack trail west of Gross Reservoir. Other four-wheel drive roads in the area provide additional mileage of riding.
Difficulty Level: Easy to Intermediate

Lake and Pond Fishing

Day Hiking


Fire Information Unless 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: Easy

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