Easements in Cass County, Texas

What a flowage easement actually is

A flowage easement is not government ownership of the land -- the private owner still holds title, pays property taxes, and can sell the parcel -- but it is a perpetual bundle of rights the government has permanently acquired over it. At Wright Patman Lake, a reservoir on the Sulphur River spanning Bowie and Cass Counties, the US Army Corps of Engineers holds flowage easements on roughly 78,000 acres of privately owned land around the lake, separate from the smaller acreage the Corps owns outright in fee. The easement exists because the reservoir's operation requires flooding land beyond the lake's normal conservation pool during high-water events, and the government secured the legal right to do that on private land decades ago when the project was built, rather than buying every acre outright.

The easement area is mapped, not vague: it generally covers the land between the Corps' fee-owned boundary line and a metes-and-bounds contour established at 265 feet above mean sea level. A parcel entirely above that elevation is typically outside the flowage easement area; a parcel that dips below it, even partially, may have some or all of its lower ground encumbered.

What the easement actually restricts

Three specific rights matter most to a buyer. First, the government retains the right to flood the easement land as part of operating the lake -- meaning periodic inundation is a legally anticipated use of the property, not a rare emergency. Second, the government has the right to flatly prohibit construction or maintenance of any structure intended for human habitation on flowage easement land -- a house, cabin, or similar dwelling generally cannot be built there, full stop. Third, the government retains the right to approve or deny nearly every other kind of structure before it goes up; wire fencing is the one type of improvement specifically carved out as not requiring approval.

In practice, that means a boat dock, storage building, barn, RV pad, or similar improvement on flowage easement land needs prior written approval from the Corps' District Engineer before construction, not just a county building permit. The Corps has indicated that a structure that doesn't reduce the lake's flood-storage capacity and isn't intended for human habitation can often be approved -- but approval is required first, and building without it is a real compliance problem, not a formality to skip.

What to check before buying near Wright Patman Lake

1. Ask the seller, title company, and the Corps of Engineers Wright Patman Lake Project Office directly whether a specific parcel -- or any part of it -- falls inside the flowage easement area, rather than assuming distance from the shoreline is a reliable guide.
2. Get the parcel's elevation checked against the 265-foot-above-mean-sea-level contour that generally defines the easement boundary; a survey or the Corps' own real estate office can confirm this for a specific tract.
3. If any part of the intended building site sits within the easement, understand that a residence cannot be built there under the terms of the easement -- plan any house site on unencumbered, higher ground on the same parcel if one exists.
4. For any other planned structure (dock, shed, barn, RV pad) on flowage easement land, submit for Corps approval before starting construction, and budget the review time into a project timeline rather than assuming it's a rubber stamp.