Brownsville Area Reservoirs: Monitored Water Supply Reservoirs are 27.5% full on 2026-01-18

Historical Data

Date Percent Full Reservoir Storage
(acre-ft) 		Conservation Storage
(acre-ft) 		Conservation Capacity
(acre-ft)
Most recent 2026-01-18 27.5 1,042,631 929,529 3,375,775
1 day prior 2026-01-17 27.6 1,043,685 930,470 3,375,775
2 days prior 2026-01-16 27.5 1,043,134 929,988 3,375,775
1 week prior 2026-01-11 27.6 1,043,240 930,106 3,375,775
1 month prior 2025-12-18 26.3 1,050,414 888,890 3,375,775
3 months prior 2025-10-18 26.7 1,087,997 901,203 3,375,775
6 months prior 2025-07-18 24.8 1,072,841 837,064 3,375,775
1 year prior 2025-01-18 21.1 1,026,215 711,052 3,375,775
*

 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 1as of 2026-01-18 Water Supply and Flood Control 35.0 1,053.26 -63.74 709,324 633,931 1,813,408 19,128
Falcon 1as of 2026-01-18 Water Supply and Flood Control 18.9 256.20 -45.00 333,307 295,598 1,562,367 22,107
footnotes
1

Lake Amistad and Lake Falcon straddle the border of Texas and Mexico. By treaty, Texas has rights to 56.2% of the total conservation capacity of Amistad and 58.6% of the total conservation capacity of Falcon. 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 the fixed percent of total conservation capacity. Conservation storage is based on the bi-weekly changing Texas share.