Picket Wire Canyonlands reveals Las Animas County’s deep history

Picket Wire Canyonlands is the place in Las Animas County where federal land rules, road conditions, and local capacity determine whether people can actually reach one of North America’s rarest fossil sites. The same canyon system that holds dinosaur trackways, Hispanic-era ruins, and ranching history is also remote enough that visitors have to plan around distance, water, and vehicle access before they ever reach the bedrock.

A canyon shaped by Dust Bowl recovery and federal stewardship

The Picket Wire landscape sits inside the Comanche National Grassland, a stretch of about 443,765 acres across Baca, Las Animas, and Otero counties. The U.S. Forest Service describes that grassland as the product of rehabilitation work on land once devastated by the Dust Bowl, and says it is managed to conserve grass, water, wildlife habitat, and prehistoric and historic areas.

That management model matters in Las Animas County because Picket Wire is not a park with broad paved access or built-out visitor services. It is a working public landscape where the agency has to balance preservation with use, and where the condition of the road system, the trailhead, and the canyon itself shapes who can come in and how many people the site can absorb at once. The grassland also supports rare species including lesser prairie chicken, golden eagle, and swift fox, so the same stewardship decisions that protect the tracks also affect living habitat.

The route into the canyon

The Picket Wire Trail is 17.6 miles long, winding through natural, archaeological, and historical terrain. The round trip to the dinosaur tracks is 11.2 miles from Withers Canyon Trailhead, with visitors descending about 250 feet into the canyons before reaching the paleontological area.

Withers Canyon Trailhead is the only public access into Picket Wire Canyonlands. Hiking, nonmotorized bicycles, and horseback riding are allowed there, but potable water is not available, which makes the trip a serious day-long undertaking in southeastern Colorado heat. The Forest Service recommends carrying at least one gallon of water per person, a basic rule that reflects how quickly the canyon can turn a visit into a safety problem if people underestimate distance, exposure, or the lack of services.

For visitors who cannot make the hike, the Picket Wire Guided Auto Tour is the only authorized motorized access. It requires high-clearance 4WD vehicles, runs from 8 a.m. to 4 p.m., and is offered on Saturdays in May, June, September, and October by reservation. That limited schedule shows how tightly access is controlled, both to protect the site and to keep traffic manageable on fragile roads and canyon surfaces.

North America’s largest known dinosaur tracksite

The draw that put Picket Wire on the map is not just scenic access but scale. The Forest Service describes the canyonlands as home to the largest known dinosaur tracksite in North America, and one agency summary says the site holds more than 1,900 individual prints in 130 trackways stretching across a quarter mile of bedrock. Another Forest Service trail page uses a different count, describing more than 1,400 individual tracks on 100 pathways, but both summaries point to the same conclusion: this is the continent’s largest known tracksite.

The tracks are associated with plant-eating Brontosaurus and carnivorous Allosaurus, and the Forest Service says parallel Brontosaurus tracks may indicate social behavior. That detail gives the canyon a scientific importance that goes beyond spectacle. For teachers, local families, and visiting students, the site offers a direct look at prehistoric movement preserved in place, not in a museum case.

The way the tracks are reached is part of the story too. A visit requires a long walk, a descent into the canyon, and enough preparation to keep people from damaging the surface they came to see. On a public-land site this remote, access is not a side issue. It is the main issue.

Mission ruins, settlement history, and the trail of Hispano communities

The trail also passes the Dolores Mission and Cemetery, a 19th-century ruin tied to early Hispanic settlement in the canyon country. That stop anchors Picket Wire in the broader human history of the Purgatoire Valley, where occupation goes back to the Paleo-Indian period.

Colorado Encyclopedia places the valley in the Santa Fe Trail corridor and notes the long presence of Hispano communities in the region. That history matters in Las Animas County because Picket Wire is not only a fossil landscape. It is also part of a migration route, a ranching landscape, and a corridor where Indigenous and Hispano histories overlap with later Anglo settlement and federal land management.

The canyon itself carries layered names and memory. Forest Service material says a legend places an earlier name on the river as El Rio de las Perdidas in Purgatorio. Whether visitors come for the geology or the history, the place keeps returning them to the same point: this is a landscape shaped by movement, labor, and survival across many generations.

Rourke Ranch and the county’s ranching economy

Longer outings on the trail can continue to Rourke Ranch National Historic Site, turning a fossil hike into a broader history of land use in southeastern Colorado. The Forest Service says Rourke Ranch, also known as the Wineglass Ranch, was founded by Eugene Rourke in 1871 as a cattle and horse ranch and remained active across three generations over a span of about 100 years.

History Colorado adds another layer: Eugene and his brother James began acquiring lands from departing Hispanic farmers and sheep growers in the early 1880s, eventually building one of the largest cattle ranches in the area. The original ranchstead, established in 1875, was abandoned after a flood in 1904, and the district was listed on the National Register of Historic Places on September 21, 2000. The ranch grew from Eugene Rourke’s original 40 acres to well over 52,000 acres.

Those figures make Rourke Ranch more than a preserved homestead. It is a record of how land ownership, water, flood risk, and regional power shifted across the county. For Las Animas County, it is one of the clearest places to see how ranching consolidated acreage and how those decisions still shape the public landscape around Picket Wire today.

Why this canyon still matters now

Picket Wire Canyonlands brings together dinosaur footprints, mission ruins, ranching history, and a living grassland that the Forest Service is still trying to protect after the Dust Bowl. The site’s value lies in that overlap. Visitors see the largest known dinosaur tracksite in North America, but they also move through a canyon where access is limited by road conditions, water availability, vehicle rules, and the need to keep a fragile public resource intact.

That combination is what makes Picket Wire one of Las Animas County’s most revealing places. It is a county story written in bedrock, floodplain, trail, and fence line, and every mile into the canyon shows how stewardship decides what the public can reach, and what it must be careful not to destroy.