Outlook

Middle estimate, with the range the level has an 8 in 10 chance of landing in. The bars share one scale: change from today.

Next week · by Nov 2517.9 ft157.84 m−0.1 ft−0.03 m from todayLikely 517.7157.80 to 518.1 ft157.90 mChance of ending 1 ft0.3 m or more higher: under 5%

In 2 weeks · by Nov 9517.8 ft157.83 m−0.1 ft−0.04 m from todayLikely 517.6157.76 to 518.2 ft157.94 mChance of ending 1 ft0.3 m or more higher: under 5%

In a month · by Nov 25517.8 ft157.81 m−0.2 ft−0.06 m from todayLikely 517.4157.69 to 519.5 ft158.35 mChance of ending 1 ft0.3 m or more higher: 10%

Rises are harder to call. Heavy rain in the watershed can push the lake above these ranges within days.

Rain, past 7 days: 0.0 in0 mm watershed average
Rain forecast, next 7 days: 0.7 in17 mm normal 0.9 in24 mm

Statistical estimate, not safety, boating, or water-quality advice. For ramps, closures and advisories, check the U.S. Army Corps of Engineers.

Map

Map of Lewisville Lake with the dam, level gauge and 21 public boat ramps.

Dam
Level gauge
Public boat ramp

Ramp locations from Texas Parks and Wildlife. Whether a ramp is open depends on the lake level; check the operator.

Level and outlook

FeetMeters above sea level

Measured
Middle estimate
8 in 10 range
Full pool

Show outlook as a table

Date	Low end	Middle	High end
Nov 2	517.7157.80	517.9157.84	518.1157.90
Nov 9	517.6157.76	517.8157.83	518.2157.94
Nov 25	517.4157.69	517.8157.81	519.5158.35

How well this outlook has done here

We tested the 2-week outlook on past years at this lake, as if made once a week with only what was known that day.

On average it was off by: 0.48 ft0.15 m Assuming the level stays the same was off by 0.69 ft0.21 m
Actual level inside our range: 76% of 432 tests; the range is built to catch 8 in 10
When we said a rise was possible (20–40%): 26% of those 27 times it ended 1 ft0.3 m or more higher

The rise chance uses the same threshold for every lake: 1 ft (0.3048 m).

Connected lakes

Water from upstream lakes flows into this one; water released here flows on downstream.

Upstream

Ray Roberts Lake630.7 ft192.24 m · 94%

Downstream

Lake Livingston129.2 ft39.37 m · 91%

Nearby lakes

Closest lakes in a straight line, with today's level.

About Lewisville Lake

Lewisville Lake is a U.S. Army Corps of Engineers reservoir on the Elm Fork of the Trinity River in Denton County, near Lewisville. It began as Lake Dallas in the 1920s and was expanded in the 1940s and 1950s, for flood control and as a water source for Dallas and its suburbs. Ray Roberts Lake is upstream on the Elm Fork.

More: Wikipedia · Texas Water Development Board · U.S. Army Corps of Engineers

Full pool (conservation): 522.0 ft159.11 m
Highest level since 1988: 536.8 ft163.61 m, May 2015
Lowest level since 1988: 507.1 ft154.55 m, Oct 2000
Surface area at normal pool: 23,280 acres9,421 ha
Conservation storage: 563,228 acre-feet695 million m³
Dam: Lewisville Dam, 1955
River or creek: Elm Fork of The Trinity River
County: Denton
Owner: USACE - Fort Worth District

Elevations are feetmeters above sea level (NGVD29).

Common questions

Is Lewisville Lake full right now?

On Oct 26 it was 518.0 ft, 4.0 ft below full pool (522.0 ft), holding 82% of its conservation storage.On Oct 26 it was 157.87 m, 1.23 m below full pool (159.11 m), holding 82% of its conservation storage.

Is Lewisville Lake going up or down?

The middle estimate for Nov 9 is about steady, with an 8 in 10 chance it ends between 517.6 ft and 518.2 ft. The chance it ends 1 ft or more higher than today is under 5%. Heavy rain can change that quickly.The middle estimate for Nov 9 is about steady, with an 8 in 10 chance it ends between 157.76 m and 157.94 m. The chance it ends 0.3 m or more higher than today is under 5%. Heavy rain can change that quickly.

Where does this data come from?

Daily levels come from the Texas Water Development Board and lake operators. The outlook is our own statistical model, using recent levels and forecast rain over the watershed.