"The Caja del Rio is not acreage on a map." Senator Martin Heinrich said those words standing at the La Cieneguilla Petroglyphs trailhead on May 8, 2026, unveiling a bill that covers the same high desert plateau where Las Campanas riders have been pointing their horses west for years.
Most people who board a horse at the Equestrian Center, or who lace up boots for a Saturday hike past the barn, know the club's pitch by heart: direct access to tens of thousands of acres of open land, no trailer required. What that pitch leaves out is what that land actually is. It is not a club holding. It is federal public land, split between the Santa Fe National Forest and the Bureau of Land Management, and as of this year it is the subject of a live piece of federal legislation working its way through a Congress that has six months left to act on it.
What "Open Land" Has Meant All Along
The Caja del Rio plateau stretches west from the edges of Las Campanas toward the Rio Grande, and the Equestrian Center has long marketed direct access to roughly 68,000 acres of it as a signature amenity, alongside guided trail rides that head out from the barn without ever loading a trailer. That land carries a Forest Service designation as a Wild Horse Territory, meaning the mustangs some riders spot out there are a federally managed herd, distinct from a separate, unmanaged band of feral horses known to roam the same stretch.
The plateau also holds one of the most historically intact remaining sections of El Camino Real, the road that once linked colonial Santa Fe to Mexico City, and La Cieneguilla Petroglyphs, described by state officials as one of the largest concentrations of ancient rock carvings in New Mexico. None of that history came with a fence. It came with decades of illegal dumping, off-road vehicle damage, and, in one widely reported incident, spray-painted vandalism at the petroglyphs themselves. That is the backdrop for the bill.
The Bill Filed While Riders Were Still on the Trail
Heinrich introduced the Caja del Rio Protection Act, S.4458, in the Senate on April 30, 2026, with Representative Teresa Leger Fernández carrying an identical version in the House as H.R.8616. Senator Ben Ray Luján and Representatives Melanie Stansbury and Gabe Vasquez signed on as cosponsors. The bill would create two new federal designations across the plateau: a Special Management Area on more than 67,000 acres of Forest Service land, and a National Conservation Area on Bureau of Land Management acreage that different accounts put at either roughly 17,000 or closer to 21,000 acres, depending on which telling you read. The National Wildlife Federation's own count on the acreage lands at 105,623 acres total; other reporting has rounded the same package to a 107,000-acre expanse. The discrepancy is a rounding difference between agencies, not a contradiction worth losing sleep over, but it is worth knowing the number moves depending on the source.
What the bill actually locks down is narrower than the acreage makes it sound. It bans new roads, new mining claims, new rights-of-way, and any sale or parceling of the land. It explicitly protects grazing, hunting, and herb gathering as ongoing traditional uses, and it requires federal land managers to consult with area Pueblos and historic land grant communities before making management decisions. It does not touch the already-approved transmission line project carrying power to Los Alamos National Laboratory, which cuts across part of the plateau and is written into the bill as an existing use the legislation leaves alone.
Recreational riding and hiking are not named outright in that list of protected uses. Heinrich has instead framed the bill's effect on recreation in terms of making it "more responsible," language that points toward future management plans rather than a blanket ban or a blanket guarantee. For someone who already rides out from the Equestrian Center, that is the practical takeaway: the fight in Washington is aimed at the trucks tearing new tracks and the trash piling up at dispersed camping sites, not at a Saturday trail ride.
A Governor's Read on the Same Land
Tesuque Pueblo Governor Mark Mitchell put the plateau's stakes in terms that had nothing to do with acreage counts. "The landscape also serves as a migration corridor for these animals and others," he said, referring to the deer and elk herds that move through the Caja and that his Pueblo has relied on for generations.
That framing runs alongside a separate agreement, signed in late 2025, in which the Bureau of Land Management, the Forest Service, and the Pueblo of Tesuque committed to co-stewarding culturally significant sites on the plateau, incorporating traditional ecological knowledge into how the land gets managed regardless of what happens to the 2026 bill. The co-stewardship deal is already in effect. The bill is not.
Where Your Own Trail Fits Into a Bigger Map
The line between "club trail" and "federal backcountry" is thinner than the gate makes it look. The Santa Fe Conservation Trust has run an annual Caja del Rio Gravel Grinder ride that, in past years, used a segment of the Las Campanas Trail with permission from the homeowners association, stitching together a route from downtown Santa Fe through the La Tierra Trails, across Las Campanas, and out toward the Caja del Rio and a proposed future Camino Real Trail. The ride was organized as what participants called a GUSTO study, an active attempt to map how much of that corridor could someday connect on dirt alone, gate to gate, without ever touching pavement.
That is the same ground covered by the Equestrian Center's own trail rides, on the same plateau now named in a Senate bill, linked by the same private trail your HOA occasionally opens to outside riders for one weekend a year.
What Happens Next
The bill cleared a Senate Energy and Natural Resources Subcommittee hearing on July 15, 2026, where Heinrich pressed a Forest Service deputy chief who admitted under questioning that he had never personally visited the Caja del Rio. Reporting on the bill has noted that Republican majorities in both chambers make passage of a Democratic-sponsored conservation bill an uphill climb in the current Congress. Heinrich himself has acknowledged there are only a few months left in this session to get conservation legislation marked up and moved, telling colleagues at the hearing that gridlock in Washington tends to pass eventually, even if it does not pass on anyone's preferred schedule.
None of that changes what is out there right now. The mustangs are still federally managed. The petroglyphs are still standing, dumping incidents and all. The trail still starts at the same barn it always has. What has changed is that the acreage behind the gate now has a bill number attached to it, a hearing transcript, and a governor's quote about migration corridors, all generated in the same year some of it was ridden past on an ordinary Tuesday morning.
If you want the plain-language version of what's moving in Santa Fe, from land bills to local trail news, Rachele Griego tracks the stories that actually touch this ground, one neighborhood at a time.
