6 Section Line Rules That Decide Who Crosses South Dakota Land

A South Dakota rancher can fence straight across a public section line and stay within the law, as long as they handle one small detail right.

Skipping it is a misdemeanor.

It’s one entry in a long list of rules that decide exactly who’s allowed on that ground, and when.

These are the section line rules that decide who crosses South Dakota land.

Note: This is general information, not legal advice. Section-line highway rules are set at the county and township level, so confirm current details with your county or township office.

1. Open by Default

South Dakota law creates a public highway along every section line in the state the moment the township grid was platted.

It doesn’t matter whether a road crew ever touched that ground.

That’s automatic.

The rule traces to an 1870 territorial law, almost two decades before South Dakota became a state.

It still covers the entire grid of square-mile section lines platted across the state today.

A rancher whose fence line has sat undisturbed for fifty years still owns land next to a public right-of-way on paper.

That’s true unless a county or township board formally closed that particular stretch.

2. Thirty-Three Feet on Each Side

South Dakota measures every section-line highway at exactly 66 feet wide, split equally between the two properties that share the line.

Each side gets thirty-three feet.

That width is wide enough for the public to drive across a section line, not just walk it.

A rancher can push a truck, a herd of livestock, or a loaded trailer through that 66-foot strip, the same as any county road allows.

A road authority can still buy extra width beyond that default, or take it through eminent domain.

It can even take an uneven amount on each side, to dodge a stand of trees, a barn, or rough terrain.

A grassy fence line that has never seen a grader still guarantees that same full-width crossing underneath it.

3. County or Township Vote

Closing a section line takes more than a fence and a “No Trespassing” sign.

A county commission can vote to vacate or relocate a section-line highway under its jurisdiction.

Or a township board of supervisors can do the same for a line under its township’s jurisdiction.

Neither board can vote a line away if it provides access to 40 acres or more of public land or public water.

It takes a vote.

A board can still close a section line to vehicles without fully vacating it, but only once the road itself has become unsafe to drive.

4. Gate Requirement

A landowner can string a fence straight across a section line, but only under narrow conditions.

The line has to be unimproved first, meaning nobody has ever altered it to carry vehicle traffic or used it regularly as a public right-of-way.

Even then, the landowner has to build and maintain a gate wherever that fence crosses the line.

The gate stays unlocked.

If it’s too small or too hard to open, anyone the closed line affects can file a request with the county sheriff.

The landowner then has seven days to fix it before facing a Class 2 misdemeanor charge.

5. Narrow Lane for Hunters

South Dakota lets hunters treat an open section line as public ground, but the legal lane is narrow.

A hunter can pursue small game and waterfowl on foot inside the 66-foot right-of-way.

The animal itself has to have taken flight or started running from inside that strip, or from directly overhead.

State law doesn’t let a hunter take big game from that right-of-way.

That’s the whole rule.

A hunter can still walk an open section line to reach other land they already have permission to hunt, public ground or a private field with the owner’s OK.

A hunter working a section line for waterfowl also has to stay 660 feet from any occupied home, school, or church.

6. No Duty to Keep It Safe

The public right to cross a section line comes with a trade-off for the landowner.

If someone crosses an unimproved line without an invitation, the landowner owes no duty of care and no warning about what’s out there.

Step in a badger hole out there, and the landowner isn’t on the hook.

The one exception is a hazard the landowner created on purpose, through willful and wanton conduct, like rigging a trap or deliberately hiding a danger.

That still counts against them.

Everywhere else, the immunity is the point: It’s what lets the public cross a section line without needing the landowner’s permission or upkeep in the first place.

Landlocked Without a Section Line

The section-line grid crosses the entire state, but a handful of tracts still end up landlocked with no line reaching them at all.

State law protects the owner of an isolated tract of at least ten acres, or a smaller residential tract of at least five acres.

That owner can condemn a private easement across a neighbor’s land to reach a public highway.

It’s a lawsuit.

The catch is that a tract next to a section-line right-of-way doesn’t count as isolated in the first place.