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Cooper Lake (Jim Chapman) water level today

Cooper Lake (Jim Chapman) is 65.8% full, 5.39 ft below its conservation pool of 440.0 ft, as of October 18, 2026. Over the past week the lake is down 0.33 ft; compared with a year ago it is down 2.48 ft. That is 3.24 ft below the 10-year average for October 18 (437.85 ft). The lake has been lower on this date in 7 of the 26 years on record.

Water level434.61 ftfeet above mean sea level
Percent full65.8%of conservation storage
vs. full pool-5.39 ftpool 440.0 ft
7-day change-0.33 ft
30-day change-0.93 ft
1-year change-2.48 ft

Past 12 months

434436439442444NovDecJanFebMarAprMayJunJulAugSepOctConservation pool 440.0 ft

Past 12 monthsYear before

Last 30 days

DateLevel (ft)Percent full
Oct 18434.6165.8%
Oct 17434.6666.1%
Oct 16434.7466.5%
Oct 15434.8066.9%
Oct 14434.8367.1%
Oct 13434.8667.2%
Oct 12434.9067.5%
Oct 11434.9467.7%
Oct 10434.9767.9%
Oct 9435.0168.1%
Oct 8435.0568.3%
Oct 7435.0868.5%
Oct 6435.1268.7%
Oct 5435.1568.9%
Oct 4435.1869.1%
Oct 3435.1368.8%
Oct 2435.1268.7%
Oct 1435.0468.3%
Sep 30435.0068.0%
Sep 29435.0468.3%
Sep 28435.0968.6%
Sep 27435.1368.8%
Sep 26435.1769.0%
Sep 25435.2269.3%
Sep 24435.2669.5%
Sep 23435.3169.8%
Sep 22435.3770.2%
Sep 21435.4070.4%
Sep 20435.4470.6%
Sep 19435.4970.9%
Sep 18435.5471.2%

This date in past years

DateLevel (ft)Today vs. then
October 18, 2025437.09-2.48
October 18, 2024436.98-2.37
October 18, 2023437.48-2.87
October 18, 2022434.25+0.36
October 18, 2021438.24-3.63
October 18, 2020436.55-1.94
October 18, 2019437.99-3.38
October 18, 2018443.70-9.09
October 18, 2017438.91-4.30
October 18, 2016437.29-2.68

Records

Highest level on record: 448.51 ft (March 2, 2018). Lowest: 422.02 ft (December 28, 2006). Records in this series start October 1, 2000; early years are monthly readings.

About these numbers

Levels are daily averages in feet above mean sea level, estimated by the Texas Water Development Board from gauges run by TWDB and partner agencies. "Percent full" compares water in conservation storage with the lake's conservation capacity of 258,723 acre-feet; flood storage above the conservation pool is not counted, so a lake can read 100% while still rising. Latest reading: October 18, 2026. Official TWDB page for Cooper Lake (Jim Chapman).

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