Edwards-Plateau Climate Division Reservoirs: Monitored Water Supply Reservoirs are 47.5% full on 2026-09-13

Historical Data

Date Percent Full Reservoir Storage
(acre-ft) 		Conservation Storage
(acre-ft) 		Conservation Capacity
(acre-ft)
Today 2026-09-13 47.5 2,130,325 2,024,502 4,261,647
Yesterday 2026-09-12 47.5 2,132,190 2,026,334 4,261,647
2 days ago 2026-09-11 47.6 2,133,852 2,027,969 4,261,647
1 week ago 2026-09-06 47.8 2,141,518 2,035,512 4,261,647
1 month ago 2026-08-13 48.2 2,178,281 2,054,650 4,261,647
3 months ago 2026-06-13 45.3 2,040,932 1,929,948 4,261,647
6 months ago 2026-03-13 45.4 2,022,584 1,936,232 4,261,647
1 year ago 2025-09-13 48.3 2,242,894 2,059,182 4,261,647
*

 Percent Full is based on Conservation Storage and Conservation Capacity and doesn't account for storage in flood pool.

Area Map

recent reservoir storage map

Reservoir Storage

Reservoir Type Percent Full Water Level
(ft) 		Height Above Conservation Pool
(ft) 		Reservoir Storage
(acre-ft) 		Conservation Storage
(acre-ft) 		Conservation Capacity
(acre-ft) 		Surface Area
(acres)
Amistad 1 Water Supply and Flood Control 39.0 1,056.49 -60.51 773,643 706,620 1,813,408 20,720
Brady Creek Water Supply 85.6 1,740.83 -2.17 26,293 24,671 28,808 1,837
Buchanan Water Supply 96.6 1,018.69 -1.31 851,130 837,468 866,694 22,179
E V Spence Water Supply 9.7 1,842.66 -55.34 50,037 50,037 517,272 3,302
Inks Water Supply 95.3 887.19 -0.81 13,367 13,084 13,729 790
Lyndon B Johnson Water Supply 98.7 824.77 -0.23 130,141 111,301 112,778 6,410
Marble Falls Water Supply 96.5 736.56 -0.44 7,329 7,329 7,597 605
Nasworthy Water Supply 85.8 1,871.74 -0.97 8,738 8,245 9,615 1,235
O C Fisher Water Supply and Flood Control 11.3 1,872.74 -35.26 13,061 13,060 115,742 1,151
O H Ivie Water Supply 42.7 1,530.01 -21.49 236,872 236,872 554,340 - n.a. -
Oak Creek Water Supply 14.3 1,973.85 -26.15 5,752 5,602 39,210 533
Twin Buttes Water Supply and Flood Control 5.6 1,896.47 -43.73 13,962 10,213 182,454 1,140
footnotes
1

Lake Amistad straddles the border of Texas and Mexico. By treaty, Texas has rights 56.2% of the total conservation capacity. The fraction of the actual storage that belongs to Texas is formally determined biweekly by the International Boundary Water Commission (IBWC). The IBWC is the legal repository of data related to this lake for treaty purposes and official versions of the datasets should be obtained directly from them. Conservation capacity is based on 56.2% of total conservation capacity. Conservation storage is based on the bi-weekly changing Texas fraction.