Texas Reservoirs and Water-Supply Projects: What Landowners Should Know

When a new lake shows up on a planning map, it is easy to assume the decision has already been made, or, just as easily, to assume it never will be. Texas water projects rarely fit either assumption. Most move through a long, public, and largely documented process, and the single most useful skill a landowner can develop is telling which stage a project has actually reached.

Texas has a statewide water-planning system

Texas develops a state water plan every five years, and the planning process begins locally: 16 regional water-planning groups, made up of local representatives, prepare regional plans that the Texas Water Development Board (TWDB) assembles into the statewide plan.

Each regional group evaluates:

• projected population;
• projected water demand;
• existing water supplies;
• drought-of-record conditions;
• potential shortages; and
• recommended water-management strategies to close the gap.

The Draft 2027 State Water Plan, Phase I of which TWDB released on April 16, 2026, includes thousands of recommended projects and strategies of all sizes, from conservation programs to major new reservoirs. According to that draft, implementing the recommended water-management strategies could require nearly $174 billion in capital investment through 2080, measured in 2023 dollars and excluding future inflation. That figure describes the estimated capital cost of recommended projects in a draft plan as of its publication date; it is not a construction budget, an appropriation, or a list of approved projects.

For a fuller walkthrough of the draft plan's projections and figures, see our guide to Understanding the 2027 Texas State Water Plan.

A plan is not the same as a permit

A project may appear, at different times and in different forms, in:

• a regional water plan;
• the state water plan;
• a feasibility study;
• a board presentation;
• a financing request;
• a permit application;
• a final design; and
• a construction contract.

These stages are different, and the differences matter. Appearing in a plan makes a project eligible for certain state processes and financing programs; it does not grant land, water rights, federal authorization, or money. Many recommended strategies are studied and never built, are built in a different form, or are replaced by alternatives as conditions change.

What approvals may be required?

Requirements depend on the project, its location, and its sponsor, but a major water-supply project may require some or all of the following before construction:

• property ownership or acquisition for the project footprint;
• flowage easements over land that may occasionally hold water;
• access easements for roads and maintenance;
• pipeline easements for conveyance;
• state surface-water rights (or amendments to existing rights) from the Texas Commission on Environmental Quality (TCEQ);
• other TCEQ review, depending on the project;
• federal Clean Water Act Section 404 authorization from the U.S. Army Corps of Engineers for discharges of dredged or fill material into waters of the United States;
• environmental review of impacts and alternatives;
• cultural and historic-resource review;
• dam-safety requirements for qualifying structures;
• financing, bonds, loans, state programs, or customer contracts; and
• design and construction approvals.

Each item on that list is its own process, with its own agency, records, and timeline. A project can hold some approvals and lack others for years.

What is an off-channel reservoir?

Many of the reservoirs Texas is now planning are off-channel reservoirs (often abbreviated OCR). An off-channel reservoir is built beside the main river channel rather than by damming the river itself, and it is generally filled by pumping or diverting river water into storage when water is legally and physically available.

Because it does not dam the main channel, an off-channel design can reduce certain impacts. It does not eliminate the project's footprint. An off-channel reservoir may still require:

• large tracts of land for the impoundment;
• embankments and spillways;
• intake structures on the river;
• pump stations;
• pipelines between the river and the reservoir;
• electrical facilities to power the pumps;
• roads;
• mitigation areas to offset environmental impacts; and
• flowage easements on surrounding land.

What does “site of unique value” mean?

Texas law allows certain potential reservoir sites to be designated as sites of unique value for the construction of a reservoir. This designation deserves careful reading, because it is often misunderstood in both directions.

What the designation can do: help protect a potential reservoir location from conflicting development, so the site remains available if a project later advances.

What the designation does not do by itself:

• approve construction;
• issue a water right;
• complete environmental review;
• set final project boundaries;
• authorize every land acquisition; or
• mean that construction is imminent.

A unique-value designation is a placeholder in state policy, not a green light. Some designated sites have remained undeveloped for decades. The Draft 2027 State Water Plan recommends a small number of new unique-value sites; their current legislative and planning status should be confirmed with TWDB before relying on any list.

Why landowners should pay attention early

By the time construction equipment arrives, the important decisions were made years earlier. The practical window for asking questions, reviewing records, and participating in public processes opens much sooner, usually with quiet, documentable steps such as:

• survey or right-of-entry requests to landowners;
• engineering contracts approved by a sponsor's board;
• environmental studies commissioned for a site;
• preliminary maps in planning documents or presentations;
• property purchases by a project sponsor;
• water-right applications or amendments filed with TCEQ;
• regional-plan amendments adding or changing a strategy;
• federal public notices;
• board-agenda items mentioning the project; and
• easement inquiries from acquisition agents.

None of these guarantees a project will be built. Each one is a signal worth recording, dating, and following. Our step-by-step method is in How to Track a Texas Water Project Before Construction Begins, and the full stage-by-stage sequence is in How a Proposed Reservoir Moves From Planning to Construction.