Fourmile Area: Natural Bridge

Buena Vista, Colorado (Chaffee County)

Last Updated: 05/08/2022
4.6 / 5 ( 17 reviews )
Zoom in to see trails...
Typically Open: Year Round
Difficulty: 3-3
Length: 6.99 miles
Highest Elevation: 9200 feet
Duration: About 1 hour, 20 minutes
Shape of Trail: Loop
Best Direction to Travel: N/A
Nearest Town: Buena Vista
Nearest Town w/ Services: Buena Vista
Official Road Name: 373, 311
Management Agency: San Isabel National Forest
District: Salida Ranger District


Highlight: Fourmile Area: Natural Bridge
The Natural Bridge Loop is a scenic trail with a hiking option located just northeast of Buena Vista. The trail snakes back and forth over small ridges and through steep gullies before reaching the Natural Bridge rock formation. While an impressive photo opportunity from the road, the optional .75 mile hike to the bridge allows for an up close look and an amazing view of the Arkansas River Valley below. The return trip is equally as impressive with panoramic views of the 14,000' Collegiate Peaks as the backdrop. Bring your hiking gear and some water if you plan to hike to the bridge as it's a steep non-maintained trail up the mountainside.


Route Information

Advanced Rating System

Recommended Vehicle:
Stock SUV with High Clearance and 4 Low
The trail has a few mild hill climbs, but the majority of the trail is flat with only small rocks.

Technical Rating

Typically, more rock or undulated road surface. Potential rocks and/or tree stumps less than 12" tall and/or vertical ledges less than 12" tall and/or near vertical ledges or waterfalls less than 24" inches. Tire placement becomes more difficult. Can be steep.
Read more about our rating system

Community Consensus

Be the first to start building the community consensus! Leave a trail review below!


This trail is part of the Fourmile Travel Management Area northeast of Buena Vista. The Natural Bridge route follows FS 373 and part of FS 311 making a large loop. The road surface is mostly sand and/or smooth dirt as the trail climbs up and out of the valley. There are some steep gullies to navigate before the trail drops in elevation near the Natural Bridge hiking trail. The route then circles back toward Buena Vista giving a panoramic view of the Collegiate Peaks for the return trip.


1. Trailhead (0 mi)
The trailhead is immediately after you pass though a fence and over a cattle guard where FS 376 goes straight and FS 311 splits off to the left. Take FS 311 to the left.
2. FS 373 (0.5 mi)
Take a left hand turn at this intersection onto FS 373. FS 311 goes to the right, you will return on this road to conclude the loop. There is a nice photo op here of Mount Yale, 14,199'.
3. FS 373 to Right (1.02 mi)
Drop into a sandy wash and turn right to follow FS 373. Stay on the designated trail as this has been an area with resource damage in the past.
4. FS 373 to Right (3.38 mi)
Turn right and head downhill to follow FS 373 at this intersection. A left turn will take you to the Davis Meadow mountain bike trail.
5. Little Fourmile Creek (3.47 mi)
Cross through Little Fourmile Creek and make a sweeping right hand turn as you come up the hill.
6. Natural Bridge (4.3 mi)
The small turn-out marks the the trailhead for the Natural Bridge Hiking trail. The optional hike is a .75 mile (one way) trek on a non-maintained trail with a substantial elevation gain to the rock formation.
7. FS 311 to Right (4.84 mi)
Turn right onto FS 311 heading back toward Buena Vista at this intersection. A left hand turn here will take you to the Sevenmile Creek Trail.
8. Continue Straight (5.78 mi)
Continue straight on FS 311. FS 1414 takes off to the left, this is not a full-size motorized vehicle trail.
9. End (6.79 mi)
The trail ends when you get back to Waypoint 2. You can re-trace your route back to the trailhead and continue on the Lenhardy Cutoff Trail or you can turn right here and head back to Waypoint 3, turn left and take FS 376A back to the Fourmile Creek Trail.

Directions to Trailhead

From the stoplight in Buena Vista head east on East Main Street and in two blocks turn left onto North Colorado Street. Continue north on Colorado Street as it becomes CR 371. Continue on CR 371, you will cross the Arkansas River and wind through a residential area before CR 371 transitions to dirt. Continue on 371 as the dirt road begins, soon you will see the Midland Train Tunnels, turn right onto FS 375 just before you get to the first tunnel. You are now at the trailhead for the Spanish Mills Trail, you must first complete Spanish Mills before reaching the trailhead for the Natural Bridge Loop.


Formal lodging is available in the town of Buena Vista only a few miles southwest. Camping is allowed where there are existing dispersed sites along the trail. The campsites with the best views are located just between Waypoints 5 and 6. Camping in these areas is limited to 14 days. Please camp only in existing sites with a campfire ring, do not build new campfire rings. Extinguish campfires thoroughly with water and always know and observe current fire restrictions. Please help us keep this trail clean and pack everything out that you pack in.
Camping: Fourmile Area: Natural Bridge

Land Use Issues

This area is part of Pike-San Isabel National Forest, and as such is part of the 2011 Lawsuit where a coalition of conservation and recreation groups are suing the U.S. Forest Service over what they say is the illegal addition of 500 miles of motorized roads and trails. A settlement was reached in late 2015 that is requiring the U.S. Forest Service to re-evaluate the roads and create a new travel management plan. Over the next year, 30 roads will be partially or completely closed while this evaluation takes place over the next 5 years. It is imperative that the OHV community let's their voices be heard on this issue. If we do nothing, those 500 miles will be shutdown. Contact the local ranger districts and let them know why the area is important to you and the history you have there. Salida Forest Service District Office Leadville Forest Service District Office

Trail Reviews (20)

Questions & Answers (1)

Q: Does anyone have a gps coordinates for the bridge?
–Justin Noland (10/15/2020)
A: 38.908400,-106.093000
–Justin Noland (11/24/2020)

Writer Information

Marcus Trusty

Mapping Crew - Colorado

Marcus is a 4th generation Buena Vista, Colorado native who grew up bouncing around the central Colorado mountains in the back of his dad's CJ5. During his younger years, Marcus grew to appreciate public lands and the recreation opportunities backroads and 4-wheel drive trails offer. Marcus has been wheeling for 20 years now and has wheeled in Colorado, Arizona, New Mexico, Nevada, and California. Until a few years ago Marcus had just been a participant in the wheeling community, but he has become much more active in preserving trails and working to make sure the wheeling community has their access maintained for future generations. In 2017 Marcus helped to found Colorado Off Road Enterprise - CORE, based out of Buena Vista. CORE has worked with the Forest Service and BLM and has volunteer agreements in place with both organizations. CORE also has a Forest Service trail adoption agreement in place for Grizzly Lake, Pomeroy Lake, Hancock Lake, Hancock Pass, and Tincup Pass, Tomichi Pass, Williams Pass, Ptarmigan Lake, Mineral Basin, Clohesy Lake, Lost Canyon, Champion Mill, Iron Mike Mine, and Slide Lake. If Marcus is not working you can generally find him somewhere out on the trails around Buena Vista.
For individual use only, not to be shared.