Brooklyn Street Lock And Dam Reservoir Report

Last Updated: December 5, 2025

Brooklyn Street Lock and Dam, located in San Antonio, Texas, is a concrete structure designed by HDR Engineering Inc for the primary purpose of navigation on the San Antonio River.


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Summary

Completed in 2009, this dam stands at a height of 13.5 feet with a hydraulic height of 15.5 feet and a structural height of 20 feet. With a storage capacity of 28 acre-feet, the dam covers a surface area of 27.6 acres and has a maximum discharge capacity of 10,400 cubic feet per second.

Managed by the Texas Commission on Environmental Quality (TCEQ), the Brooklyn Street Lock and Dam has been deemed to have a satisfactory condition assessment as of April 2021. Its spillway, controlled and 33 feet wide, serves as a safety measure to manage water flow during peak periods. While there are no associated locks with this dam, it features outlet gates for controlled and uncontrolled water release. With a very high risk rating, the dam is closely monitored for any potential hazards and is subject to regular inspections and enforcement by the state regulatory agency.

Despite its relatively recent construction, the Brooklyn Street Lock and Dam plays a crucial role in facilitating navigation along the San Antonio River. Its strategic location and design elements ensure the efficient management of water flow and storage, contributing to the overall water resource management efforts in Bexar County, Texas. For water resource and climate enthusiasts, this dam serves as a testament to the ongoing efforts to balance the needs of navigation and environmental conservation in a rapidly changing climate landscape.

Year Completed

2009

Dam Length

33

Dam Height

13.5

River Or Stream

SAN ANTONIO

Primary Dam Type

Concrete

Surface Area

27.6

Hydraulic Height

15.5

Nid Storage

28

Structural Height

20

Outlet Gates

Other Controlled - 2, Uncontrolled - 1

Hazard Potential

Not Available

Foundations

Rock, Soil

Nid Height

20
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.