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 2503.8 ft153.55 m0.0 ft−0.01 m from todayLikely 503.7153.53 to 503.9 ft153.60 mChance of ending 1 ft0.3 m or more higher: under 5%

In 2 weeks · by Nov 9503.8 ft153.56 m0.0 ft+0.01 m from todayLikely 503.7153.52 to 504.1 ft153.65 mChance of ending 1 ft0.3 m or more higher: under 5%

In a month · by Nov 25503.8 ft153.56 m0.0 ft+0.01 m from todayLikely 503.6153.48 to 504.8 ft153.85 mChance of ending 1 ft0.3 m or more higher: 15%

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 in1 mm watershed average
Rain forecast, next 7 days: 0.5 in13 mm normal 0.8 in20 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 Granger Lake with the dam, level gauge and 6 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	503.7153.53	503.8153.55	503.9153.60
Nov 9	503.7153.52	503.8153.56	504.1153.65
Nov 25	503.6153.48	503.8153.56	504.8153.85

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: 0.53 ft0.16 m Assuming the level stays the same was off by 0.73 ft0.22 m
Actual level inside our range: 82% of 423 tests; the range is built to catch 8 in 10
When we said a rise was possible (20–40%): 23% of those 39 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

Lake Georgetown784.3 ft239.05 m · 79%

Nearby lakes

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

About Granger Lake

Granger Lake is a U.S. Army Corps of Engineers reservoir on the San Gabriel River near Granger and Taylor in Williamson County, impounded around 1980 for flood control and water supply. Lake Georgetown is upstream on the North Fork of the San Gabriel.

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

Full pool (conservation): 504.0 ft153.62 m
Highest level since 1995: 523.0 ft159.42 m, Jul 2007
Lowest level since 1995: 498.4 ft151.91 m, Nov 2011
Surface area at normal pool: 4,400 acres1,781 ha
Conservation storage: 51,822 acre-feet64 million m³
Dam: Granger Dam, 1979
River or creek: San Gabriel River
County: Williamson
Owner: USACE - Fort Worth District

Elevations are feetmeters above sea level (NGVD29).

Common questions

Is Granger Lake full right now?

On Oct 26 it was 503.8 ft, 0.2 ft below full pool (504.0 ft), holding 98% of its conservation storage.On Oct 26 it was 153.55 m, 0.07 m below full pool (153.62 m), holding 98% of its conservation storage.

Is Granger Lake going up or down?

The middle estimate for Nov 9 is about steady, with an 8 in 10 chance it ends between 503.7 ft and 504.1 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 153.52 m and 153.65 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.