Canyon Lake Water Levels: What Lake Home Buyers Should Know

Canyon Lake is considered full at 909 feet above mean sea level, but it is a flood control and water supply reservoir, so the level moves all the time. Before you buy a lake home here, look at how the property works across the whole range, from a drought year to a flood year, not just on the day the listing photos were taken.

Here is how the lake is managed, how far it actually swings, and where to check the level yourself.

Who manages the lake

Canyon Dam and the reservoir are owned by the federal government. According to the Guadalupe-Blanco River Authority (GBRA), GBRA owns the right to the conservation storage, which is the water at or below 909 feet, and the U.S. Army Corps of Engineers manages the flood control pool above it.

The Corps’ Canyon Lake FAQ says releases from the dam are controlled jointly. When the lake is above 909, the Corps weighs the lake level, inflow, weather forecasts and downstream flooding risk before releasing water. At 909 and below, GBRA requests releases to serve water users downstream.

It also helps to know why the lake exists. The Corps is direct about it: the dam was built for flood control and water conservation, and “recreation was not the purpose behind the construction.”

What “full” means at Canyon Lake

The 909-foot mark is the top of the conservation pool, often called the normal pool. On the Texas Water Development Board (TWDB) Water Data for Texas page, 909 feet is what counts as 100 percent full, and the flood pool tops out at 943 feet.

At 909 feet, the Corps’ history page lists about 8,309 surface acres and 93 miles of shoreline. Both numbers shrink as the water drops, because the edge of the lake moves downhill.

Anything above 909 is temporary flood storage, which the Corps releases as downstream conditions allow.

How far the level actually swings

The Corps says plainly that “the lake was never designed to stay at the 909 conservation pool level always” and that the level “will fluctuate year round.” The TWDB’s daily record and the Corps’ own history show what that looks like:

• Drought: The lake stayed below 909 feet from late 2021 until July 2026. It bottomed out near 877 feet in May 2025, about 45 percent full and roughly 32 feet below the conservation pool.
• Fast refill: In July 2026, the lake rose from about 888 feet to 909 feet in roughly a week.
• Floods: The flood of record came in 2002, when water went over the spillway for the first time and peaked at 950.32 feet. A 1987 flood reached 942.67 feet.

Evaporation plays a part too. GBRA puts the lake’s average annual net evaporation at 2.43 feet, so a hot, dry stretch pulls the level down on its own.

Low water reaches past the shoreline. GBRA’s drought plans use five stages of water use restrictions, with triggers based partly on the water level in Canyon Reservoir.

Where to check the level yourself

You don’t have to take anyone’s word for the current level, including mine. These are the sources I’d bookmark:

1. Water Data for Texas: Canyon Lake shows percent full, elevation and historical charts. On October 1, 2026, it read 907.87 feet and 97.6 percent full.
2. The Corps’ Fort Worth District reservoir report lists each lake’s elevation, its conservation pool, the difference between the two, the 24-hour change and the current release.
3. USGS gauge 08167700, “Canyon Lk nr New Braunfels,” is the source of the TWDB’s water level readings.
4. The Corps’ Canyon Lake page links to elevation and release reports, and GBRA’s conditions page posts the forecast release from Canyon Dam.

One habit worth building: when you look at listing photos, ask when they were taken, then check the level on that date.

What the swings mean for a specific home

Views and the shoreline

The federal government owns the land under the lake at 909 feet plus a strip of varying width around it, according to the Corps’ adjacent landowner page. When the water drops, the distance between a home and the water’s edge grows, and more bare shoreline shows.

You can’t fix a view by clearing that public strip. The Corps states that removing trees or shrubs on public land to enhance a lake view is illegal.

Ramp access

The Corps lists 23 boat ramps run by Comal County, the Water Oriented Recreation District (WORD), the Corps, the marinas, Lake Canyon Yacht Club and Joint Base San Antonio. Its FAQ notes that some ramps close when the water is too low, so a ramp down the street only helps if it reaches the water at the levels you’re likely to see.

Flood risk and easements

Some lakeside lots carry a federal flowage easement on their lower ground. The Corps says these easements generally cover private land below the 948-foot contour, though the deed can define the line differently, and they bar homes and other habitable structures in that area. The Corps also won’t allow septic tanks below 948 feet.

Keep the 2002 peak of 950.32 feet in mind. Look up the property on the FEMA Flood Map Service Center and price flood insurance early: FEMA notes that most homeowners insurance doesn’t cover flood damage, and a new flood policy typically has a 30-day waiting period.

Resale

Texas law addresses this directly. Under Property Code Section 5.019, a seller of property adjoining a qualifying lake or reservoir with at least 5,000 acre-feet of storage must give the buyer written notice that the water level fluctuates, including because of drought or flood. The seller’s disclosure in Section 5.008 also asks whether the property is wholly or partly in a flood pool or a reservoir.

Expect the topic to come up in the paperwork, and expect the next buyer to ask the same questions you’re asking now. A home with a view that holds up at lower water, a workable route to an open ramp, and living space well above the easement line is easier to explain when it’s your turn to sell. You can browse lake and acreage properties with that in mind, and if you’d like sales data on lakeside homes, I can pull current numbers for your area.

A pre-offer checklist

1. Write down today’s elevation from Water Data for Texas and the Corps reservoir report.
2. Ask for the dates of the listing photos and compare the lake level on those days.
3. Find the U.S. boundary line, which is marked by concrete monuments with brass caps. The Corps’ Canyon Lake Office (830-964-3341) can schedule a ranger visit to help.
4. Get a survey that shows the 948-foot contour, and have the title company check the deed history for a flowage easement.
5. Look up the FEMA flood zone and get a flood insurance quote.
6. Find the nearest ramps, who runs them, and whether they stay open at low water.
7. If you want to pump lake water for irrigation, plan on getting water rights from GBRA before you apply for a Corps license.
8. Read the seller’s disclosure and the water level notice closely.

If you’re weighing a lake home

I live at Canyon Lake, and I’d rather you buy with the full range of water levels in mind than be surprised by your first dry summer. For the bigger picture on buying here, start with my Canyon Lake Buyer’s Guide.