Brownsville Area Reservoirs: Monitored Water Supply Reservoirs are 30.6% full on 2026-09-15

Historical Data

Date Percent Full Reservoir Storage
(acre-ft) 		Conservation Storage
(acre-ft) 		Conservation Capacity
(acre-ft)
Most recent 2026-09-15 30.6 1,231,861 1,034,588 3,375,775
1 day prior 2026-09-14 30.7 1,234,506 1,036,570 3,375,775
2 days prior 2026-09-13 30.8 1,237,415 1,038,747 3,375,775
1 week prior 2026-09-08 31.1 1,251,184 1,048,945 3,375,775
1 month prior 2026-08-15 32.1 1,316,087 1,084,878 3,375,775
3 months prior 2026-06-15 26.6 1,063,743 896,820 3,375,775
6 months prior 2026-03-15 26.7 995,607 901,584 3,375,775
1 year prior 2025-09-15 26.4 1,085,724 891,615 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 1 Water Supply and Flood Control 38.9 1,056.42 -60.58 772,322 705,414 1,813,408 20,687
Falcon 1 Water Supply and Flood Control 20.9 261.12 -40.08 456,513 326,937 1,562,367 28,079
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.