This trail provides views of high mountain lakes and nearby peaks. The trail is level - and often brushy - for the first 2 miles (3.2 km) then gains elevation through cool, old-growth forest. Stop on the ridge above Thornton Lake (4.5 miles/7.2 km) for great views. For a longer, more strenuous day, scramble up Trapper Peak or down to the lake.

• Difficulty: Moderately strenuous. 
• Distance and elevation: 10.4 miles (16.7 km) roundtrip with 2,300 ft (700 m) elevation gain.
• Access: From milepost 117 on State Route 20, follow the Thornton Lake Road for 5 miles (8 km) to the trailhead (rough road - not recommended for low-clearance vehicles).
• Leashed dogs allowed up to the national park boundary.
• Backcountry camping is allowed in designated sites only with a backcountry permit.

Detailed trail description.