Lake Jacksonville Water Level
Texas · updated daily from the Texas Water Development Board
97.0% full
Lake Jacksonville is near full at 421.33 ft and falling (-0.21 ft in the last 7 days).
0.67 ft below full pool of 422.00 ft · change since yesterday -0.02 ft
Reading as of 2026-08-15 · higher than 51% of August readings on record
Where Lake Jacksonville sits historically
Today's level compared with every reading in our 27.3-year record for this lake.
Since yesterday
-0.02 ft
7-day change
-0.21 ft
30-day change
-0.70 ft
1-year change
-0.57 ft
Full pool
422.0 ft
Last 30 days
Last 12 months
Full history (27.3 years)
Lake Jacksonville records and averages
| Current level | 421.33 ft |
|---|---|
| Percent full | 97.0% |
| Storage | 24,961 acre-feet |
| Record high | 424.36 ft (2007-07-06) |
| Record low | 416.36 ft (2011-11-18) |
| Average of all readings | 421.48 ft |
| Data span | 27.3 years (9,884 readings) |
Frequently asked questions
Is Lake Jacksonville full right now?
Lake Jacksonville is at 97.0% of conservation capacity as of 2026-08-15, which we classify as near full.Over the past 30 days the level has fallen 0.70 ft.
What is the water level at Lake Jacksonville today?
The most recent reading is 421.33 ft (2026-08-15), sourced from the Texas Water Development Board. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Lake Jacksonville has ever been?
The highest level in our records is 424.36 ft on 2007-07-06. The lowest is 416.36 ft on 2011-11-18. Our record covers about 27.3 years of readings.
Is Lake Jacksonville low for this time of year?
Compared with every August in our records, the current level is higher than 51% of them — near full. Seasonal comparison matters more than the raw number, because most reservoirs draw down predictably through late summer and refill over winter and spring.
Why is Lake Jacksonville low right now?
Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Lake Jacksonville has fallen 0.70 ft over the past 30 days. For the operational reason on any given week, check the Texas Water Development Board directly.
How much has Lake Jacksonville changed over the past year?
The level is -0.57 ft compared with this date last year (421.33 ft today). The full-history chart above covers 27.3 years, with a record high of 424.36 ft and a record low of 416.36 ft.
Nearby lakes in Texas
Source: the Texas Water Development Board. Readings are provisional and subject to revision by the publishing agency. All Texas lake levels.