Texas AI Docket
Texas Water Watch

Reservoir record

Cooper (Chapman) Lake

Cooper (Chapman) Lake is 74.5% full, holding 192,751 acre feet against a conservation capacity of 258,723 acre feet.

Updated September 5th, 2026

Percent full74.5%
Storage192,751AF
Conservation capacity258,723AF
Change today-472AF
Across the record-17,832AF
Recorded range74.5% to 81.4%
Record26days

Daily movement

The line follows every verified reading held for this reservoir.

73.3%77.9%82.6% August 11th, 2026, 81.4% fullAugust 12th, 2026, 81.2% fullAugust 13th, 2026, 80.9% fullAugust 14th, 2026, 80.6% fullAugust 15th, 2026, 80.2% fullAugust 16th, 2026, 79.9% fullAugust 17th, 2026, 79.8% fullAugust 18th, 2026, 79.4% fullAugust 19th, 2026, 79.2% fullAugust 20th, 2026, 78.9% fullAugust 21st, 2026, 78.6% fullAugust 22nd, 2026, 78.2% fullAugust 23rd, 2026, 77.9% fullAugust 24th, 2026, 77.9% fullAugust 25th, 2026, 77.5% fullAugust 26th, 2026, 77.3% fullAugust 27th, 2026, 76.8% fullAugust 28th, 2026, 76.6% fullAugust 29th, 2026, 76.3% fullAugust 30th, 2026, 76.0% fullAugust 31st, 2026, 75.8% fullSeptember 1st, 2026, 75.5% fullSeptember 2nd, 2026, 75.2% fullSeptember 3rd, 2026, 74.9% fullSeptember 4th, 2026, 74.7% fullSeptember 5th, 2026, 74.5% fullAug 11thAug 24thSep 5th
Daily percent full. The vertical scale follows this record's own range instead of starting at zero, so its movement stays visible without changing the measurement.

The readings

Daily movement appears only when the previous reading is from the prior calendar day.

DatePercent fullStorageDaily movement
September 5th, 202674.5%192,751 AF-472 AF
September 4th, 202674.7%193,223 AF-472 AF
September 3rd, 202674.9%193,695 AF-789 AF
September 2nd, 202675.2%194,484 AF-791 AF
September 1st, 202675.5%195,275 AF-793 AF
August 31st, 202675.8%196,068 AF-635 AF
August 30th, 202676.0%196,703 AF-636 AF
August 29th, 202676.3%197,339 AF-797 AF
August 28th, 202676.6%198,136 AF-638 AF
August 27th, 202676.8%198,774 AF-1,119 AF
August 26th, 202677.3%199,893 AF-481 AF
August 25th, 202677.5%200,374 AF-1,123 AF
August 24th, 202677.9%201,497 AF-160 AF
August 23rd, 202677.9%201,657 AF-805 AF
August 22nd, 202678.2%202,462 AF-805 AF
August 21st, 202678.6%203,267 AF-808 AF
August 20th, 202678.9%204,075 AF-808 AF
August 19th, 202679.2%204,883 AF-648 AF
August 18th, 202679.4%205,531 AF-811 AF
August 17th, 202679.8%206,342 AF-488 AF
August 16th, 202679.9%206,830 AF-650 AF
August 15th, 202680.2%207,480 AF-978 AF
August 14th, 202680.6%208,458 AF-816 AF
August 13th, 202680.9%209,274 AF-818 AF
August 12th, 202681.2%210,092 AF-491 AF
August 11th, 202681.4%210,583 AFFirst reading

Every reading is available in the open water record.