Three Island Lake
Three Island Lake Trail is a 5.9 miles trail in Medicine Bow-Routt National Forest, Colorado. The Forest Service rates it trail class 2, moderately developed. It is open to hiking, horse and pack stock and mountain biking. It enters Mount Zirkel Wilderness.
Trail conditions, closures and hazards are not tracked here. The Medicine Bow-Routt National Forest official page carries current alerts and closure orders.
Map
One end Other endLine simplified to about 100 metres. Basemap from the USGS National Map.
| One end | 40.7664, -106.7454 · Directions ↗ |
| Other end | 40.7378, -106.6724 · Directions ↗ |
The ends are the two ends of the longest connected chain of segments. The record does not say which is the usual start. The trail is recorded as 3 segments.
The trail
| Length | 5.9 miles |
| Trail class | 2, moderately developed |
| Type | land trail |
| Surface | native material |
| Typical grade | 12-20 percent |
| Typical tread width | 36-48 inches |
| Motor vehicles | Closed to all motorized use year-round |
| Accessibility | Not evaluated |
| National designation | National Scenic or Historic Trail |
| Trail numbers | 1163.1 |
| Forest | Medicine Bow-Routt National Forest (unit 0206) |
| States | Colorado |
| Detail published | management level, with uses |
Values are the set across all segments. Class 1 is minimally developed and class 5 is fully developed. Grade and width are the forest's typical values, not measured extremes.
Allowed uses
| Hiking | Allowed 01/01 to 12/31 (month/day) |
| Horse and pack stock | Allowed year-round |
| Mountain biking | Allowed 01/01 to 12/31 (month/day) |
A use is listed when the Forest Service records it as managed, accepted or discouraged on any segment. Discouraged still means legal. Uses marked restricted are left out. Where the forest publishes a Motor Vehicle Use Map, that map governs motorized use.
Wilderness
- Mount Zirkel Wilderness WildernessFS · about 56% of the line is insideWilderness Connect ↗
Inside a designated wilderness, bicycles and motor vehicles are prohibited by law regardless of the trail record, and permits or group limits may apply.
Trailheads
The Forest Service recreation layer records no trailhead within a third of a mile of this trail's line. Many trails start from a road pullout or another trail with no trailhead record. The forest's recreation pages list the trailheads it does publish.
Distance is from the point to the nearest part of the trail line. Season text is what the forest wrote and is often a season name rather than a date. The recreation page link goes to the Forest Service site, which may redirect to the forest's recreation index.
Camping nearby
Campsite Atlas cards carry site counts and booking links from Recreation.gov. Forest Service cards come from the recreation layer and link the agency page.
Reference
Questions people ask
How long is the Three Island Lake Trail?
5.9 miles, the sum of the 3 segments the Forest Service records under this name in Medicine Bow-Routt National Forest.
Source: Forest Service trail layer
What is allowed on the Three Island Lake Trail?
hiking, horse and pack stock and mountain biking. The trail is closed to motor vehicles year-round. Some uses are seasonal. The allowed uses section lists the dates.
Source: Forest Service trail layer
Where does the Three Island Lake Trail start?
The line begins at 40.7664, -106.7454 and ends at 40.7378, -106.6724. No Forest Service trailhead is recorded within a third of a mile of it. The record does not say which end is the usual start.
Source: Forest Service trail layer
Is the Three Island Lake Trail in a wilderness area?
Yes. It enters Mount Zirkel Wilderness. Wilderness rules ban bicycles and motor vehicles and often limit group size.
Where can I camp near the Three Island Lake Trail?
Seedhouse Group Site (0.2 mi), Seedhouse Campground (1.4 mi) and Seedhouse Guard Station (1.5 mi) are within five miles of the trail. Site counts and booking links are on Campsite Atlas.
Source: Campsite Atlas
How developed is the Three Island Lake Trail?
Trail class 2, which the Forest Service describes as moderately developed. Class 1 is a minimal, unimproved route and class 5 is fully developed, often paved.
Source: Forest Service trail layer
How steep and how wide is the Three Island Lake Trail?
The typical grade is 12-20 percent. The typical tread is 36-48 inches wide.
Source: Forest Service trail layer
Is the Three Island Lake Trail a national trail?
Yes. The record marks it as a National Scenic or Historic Trail.
Source: Forest Service trail layer
Who manages the Three Island Lake Trail?
Medicine Bow-Routt National Forest, Forest Service unit 0206. The trail is in Colorado.
Source
This page is built from 3 segments named THREE ISLAND LAKE in the Forest Service TrailNFS_Publish layer, administrative unit 0206. Wilderness overlap is tested against the National Wilderness Preservation System layer from Wilderness Connect. Trailheads and Forest Service campgrounds come from the Forest Service Recreation Opportunities layer. Data refreshed September 17, 2026. The methodology page explains how segments become trails.