BLM, Forest Service and State OHV Programs: Who Decides Where You Can Ride

The first question about any trail is not how hard it is but who manages it. In the United States most motorized recreation on public land happens on ground administered by the Bureau of Land Management, the U.S. Forest Service, or a state agency. Each has its own designation system, its own maps and its own enforcement. A trail that is open on one side of a boundary can be closed on the other, with nothing on the ground to mark the line. The managing agency is the authority on any of it, so check before you load the trailer.

The Bureau of Land Management classifies its land for motorized use in broad categories: open, limited, and closed. Open areas allow cross-country travel, and are now rare outside a few designated sand and desert play areas. Limited areas restrict travel to designated routes, or by season, or by vehicle type. Closed means no motorized use. These designations come out of resource management plans and travel management plans, which are public documents that go through comment periods before adoption.

The Forest Service works from a different document. Since the travel management rule, each national forest is required to publish a Motor Vehicle Use Map that shows which roads and trails are open to which vehicle classes and in which seasons. If a route is not on the map, it is not open to motor vehicles, regardless of how well traveled it looks. The maps are free, are reissued periodically, and are the legal reference an officer will cite. Carrying the current one is the single best defense against an honest mistake.

State programs sit on top of, and sometimes alongside, the federal systems. Many states run an OHV program funded by registration or sticker fees that pays for trail maintenance, grooming, signage and enforcement. Some states manage their own OHV parks and state forest trail systems with a separate designation scheme. Others contribute grants to federal agencies for trail work on federal ground. What the state sticker buys you, and where it is required, differs enough that the state OHV program's own site is the only reliable source.

Designations also change by vehicle width. Many forest trails are designated for vehicles under a stated width, which historically separated ATVs and dirt bikes from full-size trucks. Wider side-by-sides have complicated this, and some forests have redesignated trails or added width classes to accommodate them. Whether a Polaris RZR XP 1000 or a Can-Am Maverick X3 is legal on a given trail is a designation question, not a capability question. The map answers it.

Seasonal closures are the designation most often missed. A route can be legally open in the plan and closed by date for wet-season soil protection, wildlife, or fire restrictions. Spring thaw closures in the Midwest and the Rockies, and fire-season restrictions in the Sierra Nevada and Desert Southwest, are ordinary annual events. Agencies post these on their sites and at trailheads, but not always on the printed map. The managing agency is the authority on any of it, so check before you load the trailer.

Enforcement is where the three systems meet. Federal officers enforce federal designations; state and county officers may enforce state OHV law, including registration and equipment rules, on the same trail. A rider can be compliant with one and not the other. The practical approach is to treat the strictest applicable rule as the one that binds you, and to carry both the federal map and the state registration.

Land-use designations also explain most closures the desk reports on. A trail does not simply close; a plan is amended, a temporary order is signed, or a season turns. Reading the agency's own notice tells you whether the closure is a fire order that lifts in weeks, a seasonal gate, or a plan change that will take years to revisit. Those are very different pieces of news for a rider deciding where to go this weekend.