Blalock Reservoir Dam Reservoir Report

Last Updated: December 5, 2025

Blalock Reservoir Dam, also known as Pates Creek Lake Dam, is a local government-owned structure located in Henry, Georgia.


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Summary

Constructed in 1988 for water supply purposes, this Earth-type dam stands at a height of 39 feet and has a maximum storage capacity of 6,160 acre-feet. The dam is situated on Pates Creek, within the jurisdiction of the Georgia Safe Dams Program, and is regulated, permitted, inspected, and enforced by the state authorities to ensure its safety and compliance.

Despite being classified as having a high hazard potential, Blalock Reservoir Dam is reported to be in satisfactory condition as of the last assessment in 2016. The dam features an uncontrolled spillway and outlet gates, with a moderate risk assessment rating. While the dam has not undergone any significant modifications over the years, it is subject to regular inspections every two years to monitor its integrity and address any potential risks. With its vital role in providing water supply to the area, the dam serves as a crucial infrastructure for managing water resources and climate-related challenges in the region.

As a key component of the water supply infrastructure in Henry, Georgia, Blalock Reservoir Dam plays a critical role in ensuring the availability of water resources for the local community. With its controlled operation and state-regulated oversight, the dam stands as a reliable structure for water storage and management. Despite its high hazard potential, the dam's satisfactory condition and risk management measures underscore its importance in addressing water resource and climate-related concerns in the area.

Year Completed

1988

Dam Height

39

River Or Stream

PATES CREEK

Primary Dam Type

Earth

Nid Storage

6160

Outlet Gates

Uncontrolled

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

39
       
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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.