Cornish Creek Reservoir Dam Reservoir Report

Last Updated: December 6, 2025

Cornish Creek Reservoir Dam in Newton, Georgia, is a vital water supply structure designed by WELKER & ASSOC.


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Summary

and completed in 1991. The dam stands at a height of 46.5 feet and has a storage capacity of 18,400 acre-feet, serving the primary purpose of water supply for the region. With a high hazard potential but a satisfactory condition assessment as of March 2019, the dam is under state regulation and inspection by the GA-SAFE DAMS PROGRAM, ensuring its safety and reliability for the community.

Located on Cornish Creek, this Earth-type dam with a buttress core spans 1600 feet and covers a surface area of 820 acres, drawing from a drainage area of 24.73 square miles. While the dam features uncontrolled spillways and outlet gates, it operates within state permitting and enforcement guidelines, emphasizing the importance of effective risk management measures. The dam's moderate risk assessment rating highlights the need for continued monitoring and maintenance to uphold its crucial role in providing water resources for the area.

Managed by the Local Government, Cornish Creek Reservoir Dam plays a key role in water supply infrastructure for Newton, Georgia. Although its hazard potential is deemed high, the dam's current condition is deemed satisfactory, thanks to regular inspections and enforcement by state regulatory agencies. With its completion in 1991, this vital structure continues to serve the community, underscoring the importance of responsible stewardship and risk management to ensure the safety and reliability of water resources in the region.

Year Completed

1991

Dam Length

1600

Dam Height

46.5

River Or Stream

CORNISH CREEK

Primary Dam Type

Earth

Surface Area

820

Hydraulic Height

46.5

Drainage Area

24.73

Nid Storage

18400

Outlet Gates

Uncontrolled

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

47
       
Seasonal Comparison

Weather Forecast

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Nearby Streamflow Levels

Cornish Creek Reservoir DamALCOVY RIVER ABOVE COVINGTON Preview Alcovy River Above Covington
213.0cfs
213cfs
Cornish Creek Reservoir DamBIG HAYNES CREEK AT BALD ROCK ROAD Preview Big Haynes Creek At Bald Rock Road
40.5cfs
41cfs
Cornish Creek Reservoir DamLITTLE HAYNES CREEK AT DIAL MILL RD NR MILSTEAD GA Preview Little Haynes Creek At Dial Mill Rd Nr Milstead Ga
21.9cfs
22cfs
Cornish Creek Reservoir DamYELLOW RIVER AT GEES MILL ROAD Preview Yellow River At Gees Mill Road
255.0cfs
255cfs
Cornish Creek Reservoir DamBIG HAYNES CREEK AT JACK TURNER DAM Preview Big Haynes Creek At Jack Turner Dam
45.3cfs
45cfs
Cornish Creek Reservoir DamALCOVY RIVER BELOW COVINGTON Preview Alcovy River Below Covington
287.0cfs
287cfs

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.
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