Can I build a fence in a flood zone or an easement?

Two different things on the same lot

A flood zone is a FEMA map designation for where water is expected to go in a major flood. It can cover the whole back half of a lot near a creek. An easement is a recorded right for someone else, such as a utility, a MUD, or a city, to use a strip of your land for lines or drainage. It shows up on your plat and survey. A lot can have one, both, or neither.

You can look up the current flood map for an address at the FEMA Map Service Center. For easements, check your survey and the recorded plat.

Who has a say, by location

• Unincorporated Montgomery County. The county's floodplain regulations require a development permit for development in the special flood hazard area and define development broadly enough to include excavation. The rules carve out one fence by name, three-strand barbed wire, so other fence types in the flood area may need a permit. For lots in the mapped floodplain, we confirm with the county floodplain office.
• Walker County. Subdivision plats there carry a note requiring a development permit from the county floodplain administrator before man-made changes to the land. Whether that reaches a fence is a question for that office, and we ask it for Huntsville-area acreage.
• Willis. City code makes an exception that allows fences in utility easements, but the city keeps the right to pull them out for maintenance and owes nothing for the damage.
• Panorama Village. The city's fence packet doesn't allow fences in drainage easements at all.
• City of Conroe. Inside city limits, start with the Building Inspections and Permits department. Our permit guide covers each city.

What the lake and the river have shown

Lake Conroe is a reservoir with releases, and the water downstream rises with them. During Harvey in 2017, SJRA released a record of roughly 79,000 cubic feet per second. In May 2024, releases rose to about 69,500 cfs with the lake reported near 205 feet. That water runs down the West Fork past neighborhoods like River Plantation, which has a long flood history.

On low lots there, and along the creeks that feed the lake, fences sit in saturated ground for days and catch whatever the water carries. A solid board fence turns that debris into a wall, and the wall pushes over. Floods are excluded from homeowners policies and fall outside our workmanship warranty, so on a lot that floods, a design that sheds water is the practical choice.

Fence designs that let water through

• Open ornamental aluminum or steel, which passes water and debris far better than solid boards
• Chain link, with the bottom held a few inches above grade where it crosses a swale
• An open bottom on the wood sections that cross drainage paths, instead of running the rot board straight through
• A gate or removable panels across an easement, so a utility crew can get in without cutting the fence
• Deeper, wider post holes in low, wet ground, which we size at the estimate

None of this makes a fence flood-proof. It does make it more likely to be standing, and repairable, after the water goes down.