Permit
Verification in progressA route-specific official conclusion has not yet passed the evidence check. Confirm this item with the land manager before travel.
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Arapaho and Roosevelt National Forests · CO
South Fork 21
South Fork 21 is a mapped USDA Forest Service trail in Arapaho and Roosevelt National Forests, Colorado. Forest Service GIS linework reports 24.04 miles across 1 mapped feature and 1 segment. Published TrailNFS fields identify Terra trail type, Native Material surface. The agency design record lists typical grade TG05 - +12-20% and typical tread width TW03 - 18-24 INCHES. Legally allowed uses published for at least one mapped segment include Bicycle, Pack & Saddle, Hiker/Pedestrian. The official designation field records Not designated as a National Trail. Official recreation data links the route to Williams Fork Trailhead and South Fork Trailhead; the page below preserves the agency's directions, fees, and restrictions when published. Current permit, entry, road, parking, shuttle, and closure conclusions are shown separately and remain unknown until route-specific evidence passes the publication checks.
24.04 miles2 official trailhead recordsAccess verification in progress
Area contextAt a glance
Published route facts
- Managing area
- Arapaho and Roosevelt National Forests
- State
- Colorado (CO)
- Route number
- 21
- GIS distance
- 24.04 miles
- Official surface
- Native Material
- Official trail type
- Terra
- Official trail class
- 2 — Moderately developed
- Mapped geometry
- 1 feature · 1 segment · 264 vertices
- Geometry bounds
- W -106.037003 · S 39.702257 · E -105.905401 · N 39.794009
Before you go
Access information
Unknown categories stay visible while the official source is being verified. They are never treated as “not required.”
Park entry
Verification in progressA route-specific official conclusion has not yet passed the evidence check. Confirm this item with the land manager before travel.
Road access
Verification in progressA route-specific official conclusion has not yet passed the evidence check. Confirm this item with the land manager before travel.
Parking
Verification in progressA route-specific official conclusion has not yet passed the evidence check. Confirm this item with the land manager before travel.
Shuttle
Verification in progressA route-specific official conclusion has not yet passed the evidence check. Confirm this item with the land manager before travel.
Closures
Verification in progressA route-specific official conclusion has not yet passed the evidence check. Confirm this item with the land manager before travel.
Getting there
Official trailhead records
These locations come from the managing agency and are matched to the published route geometry. Directions, fees, and restrictions are shown exactly as agency facts—not as a current availability guarantee.
Williams Fork Trailhead
69 m from the published route geometry
- Coordinates
- 39.790600, -106.023900
- Directions
- In the Williams Fork Valley, 25 miles south of Parshall (US Highway 40), off County Road 3, on Forest Road 138.
- Water
- No water is available
South Fork Trailhead
186 m from the published route geometry
- Coordinates
- 39.740000, -106.027500
- Directions
- In the Williams Fork Valley, 25 miles south of Parshall (US Highway 40), off County Road 3, on Forest Road 138. Make a right on Forest Road 142 and drive approximately five miles to the trailhead.
- Restrictions
- Practice Leave No Trace principles . Dogs must be under control at all times. 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.
- Water
- No
Forest Service dataset
Classification and managed use
Legally allowed uses
BicyclePack & SaddleHiker/Pedestrian
National designation
- Not designated as a National Trail
Published design fields
- Typical trail grade
- TG05 - +12-20%
- Typical tread width
- TW03 - 18-24 INCHES
- Accessibility field
- NOT ACCESSIBLE
Display and travel-management fields
- Development scale group
- TC1-2 — Minimally developed (Trail Class 1) or moderately developed (Trail Class 2)
- Motorized designation
- N — Designated as closed to all motorized uses year-round
These are segment display and management designations from the Forest Service dataset. They do not prove current road, trail, or seasonal availability.
Published activity management
These are Forest Service management fields retained with their published date ranges. They do not prove that the route is currently open.
- Hiker PedestrianManaged · 06/01-11/15
- Hiker PedestrianAccepted Discouraged · 11/16-05/31
- Pack SaddleManaged · 06/01-11/15
- BicycleDiscouraged · 01/01-12/31
- BicycleAccepted Discouraged · 01/01-12/31
- MotorcycleRestricted · 01/01-12/31
- AtvRestricted · 01/01-12/31
- Four Wheel DriveRestricted · 01/01-12/31
- E Bike Class1Restricted · 01/01-12/31
- E Bike Class2Restricted · 01/01-12/31
- E Bike Class3Restricted · 01/01-12/31
Hiker management field
Recorded value: 06/01-11/15. This is retained with the Forest Service meaning. It is not a best season recommendation or proof that the route is currently open.
More official records
Route-linked and nearby facilities
These agency records matched the route identity or nearby geometry. A campground or facility status applies only to that named facility, not automatically to the whole trail.
Boardwalk Trailhead
268 m from the published route geometry
- Coordinates
- 39.796216, -106.029211
- Official description
- Begins at South Fork Campground and connects to Darling Creek Trail.
South Fork Campgound
268 m from the published route geometry
- Coordinates
- 39.796216, -106.029211
- Official description
- The South Fork Campground is a first-come, first-served campground located in the Williams Fork Valley. Facilities: There are 21 non-electric sites that will accommodate tents, trailers and RVs. Each site contains a tent pad, fire grate and picnic table. Additional facilities include restrooms, trash service and drinking water. The South Fork Campground is the only campground on the Sulphur Ranger District that is designated for horse camping. There is a small corral in the campground for one or two horses. No water troughs. Group campsite : South Fork Campground also has one non-electric group site that can hold up to 25 people. The group site may be reserved. Recreation: Popular activities include hiking and horseback riding on nearby trails and in the Byers Peak Wilderness area, where Wilderness regulations apply. View a COTREX map . View a campground map .
- Fees
- Check the campground table for fee information.
- Reservations
- Single campsites are first come, first served. The South Fork Group Site may be reserved at www.recreation.gov or by calling 1-877-444-6777.
- Restrictions
- A single site may hold up to eight people. Tents must fit on pads provided. RVs, trailers and other vehicles must fit on the parking spur. Driving or parking off road is not permitted. Maximum Vehicle Length: 23' Pets must be on a hand-held leash.
Darling Creek Trailhead
486 m from the published route geometry
- Coordinates
- 39.796690, -106.025260
- Official description
- The Darling Creek Trailhead is located near the South Fork Campground in the Williams Fork area. View a COTREX area map here. Darling Creek Trail (#18) Length : 5.2 miles ONE WAY Elevation : 8,900 feet at the Darling Creek Trailhead; 12,130 feet at junction with St. Louis Divide Trail (#17) Trail Description : Beginning at the Darling Creek Trailhead , located near the Sugarloaf Campground , the trail crosses the boardwalk. The trail is a moderate hike at the start. When the trail forks from Darling Creek, it quickly gains elevation and becomes steep in sections. When the trail connects with the St. Louis Divide Trail , there is an excellent view of the area. Latlong : 39.79669; -106.02526 Download a trail summary here. View a trail map here .
Local route geometry
