Should I Install a Cattle Guard or a Farm Gate?

What each one actually does

A cattle guard is a grid of pipes or rails laid over a shallow pit where a drive crosses a fence line. Vehicles roll across it. Cattle won’t walk onto it, because the gaps and the drop under them give no safe footing. On each side, wings connect the fence to the guard, so animals can’t walk around the end. That’s the “cattle guard fence” people search for: the fence and the guard work as one line.

A gate is a moving part of the fence. It closes completely, it can be locked, and it works for every animal, not just cattle. The trade-off is that someone has to open and close it, or it needs an operator to do that automatically.

So the choice is really about three things:

• Vehicle convenience. A guard never has to be opened. A hand gate has to be opened and closed on every trip.
• Which animals. A guard is built around cattle. Horses are the big exception (see below).
• Control over people. A guard is always open to any vehicle or anyone on foot. Only a gate can close the entrance.

On the mainland side of Galveston County, around Santa Fe and Hitchcock, and across Brazoria County, most small acreages have one drive-through entrance and several working gates behind it. The working gates are covered in farm gate vs ranch gate. This page is about the entrance.

How a cattle guard is built

The clearest public drawings of a farm cattle guard are the USDA and Mississippi State University Extension plans (publication 6051, drawn in 1968 and still published). They are a reference design, not a code, but they show every part a buyer should ask about:

• The deck. Fourteen pieces of 2-inch galvanized steel pipe, 7 inches on center, each 10 feet long, running across the road. With pipe that size, the clear gap between pipes works out to about 4.6 inches (7 in minus the 2⅜ in outside diameter).
• The pit. An excavated pit 18 inches deep under the pipes, with concrete curbs at each end and a support under the middle of the pipes.
• Drainage. A 4-inch drain tile “where possible.” A pit is a hole in the road, and water will find it.
• Size. A 10-foot opening across the road, 9 feet along the direction of travel, and 16 feet 8 inches between the fence posts at the tips of the wings.
• Wings. Sloped panels of 1×6 slats spaced 3 inches apart that close the gap between the fence and the guard.

The same publication has a wood version: 2×4s on edge, 8 inches on center, over a pit 2 feet 8 inches to 3 feet deep overall. Most guards sold today are prefabricated steel, so treat the plan as a checklist. Whoever builds yours should be able to tell you, in writing, the spacing, pit depth, drainage and load rating. The NRCS Texas fence specification also expects the location of “gates and cattle guards” to be part of a fence design, so plan the guard and the fence together.

Do cattle guards work for horses?

No. The University of Georgia Cooperative Extension puts it plainly: “Cattle guards don’t work well either because horses will often try to jump across or walk through, again tangling and injuring legs.” A horse that tries to cross can put a leg between the pipes.

If horses live behind the entrance, use a gate. The same UGA article suggests 12 to 16 feet as a handy width for main gates so equipment can get through, and says the gate should be as tall as the fence so horses don’t lean over it or try to jump it. If the entrance gets a lot of traffic, an automatic gate gives you the no-stopping convenience of a guard without the leg risk. See how solar gate openers work, which is how most rural entrances far from grid power are automated.

Goats, sheep and pigs are a different question. The extension plans cited on this page were designed around cattle. If you keep smaller livestock, ask the guard maker to state in writing whether its design stops your animals. If it won’t, use a gate.

Coastal ground and the pit

A cattle guard is the only entrance option that puts a hole in the drive. On flat, low ground that holds water after heavy rain, the pit is the part to plan carefully. The USDA plan handles it two ways:

• It calls for a 4-inch drain tile out of the pit “where possible.” Ask where yours will drain to. A pit with nowhere to drain holds water and silt.
• It shows two ways to set the guard: with the floor level with grade, or raised above grade with earth ramps up to it. The raised version needs less digging below the road surface.

A gate has no pit. It needs a brace assembly on both sides of the opening, and the NRCS Texas fence specification notes that sandy and consistently wet soils need posts set deeper than its standard 3 feet. Either way, the ground at your entrance shapes the job, which is why it’s worth looking at on site before choosing.

The common answer: a guard and a gate

The USDA plan itself draws a “gate for passage of cattle and wide equipment” next to the guard, and its note says a wide gate beside the guard “is suggested for passage of extra wide equipment and livestock.” That is the setup many working entrances end up with:

• The guard takes the everyday traffic, so nobody gets out of the truck.
• The gate beside it handles cattle drives, hay equipment wider than the guard, and anything that has to be closed at night or locked while you’re away.

Size the gate for the widest load. UGA’s horse fencing bulletin puts pasture gates for equipment at 14 to 16 feet. Hang it on braced posts, as described in farm gate vs ranch gate. If you want drive-through convenience without a pit, a bump gate or an automatic gate are the other options.

Questions we get about this