Seney A-1 Pool Dam Reservoir Report

Last Updated: December 5, 2025

Seney A-1 Pool Dam, located in Schoolcraft, Michigan, is a federal-owned structure on the Greys Creek, managed by the USDA Bureau of Agricultural Engineering.


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Summary

Constructed in 1937, this Earth dam stands at a height of 13 feet and has a hydraulic height of 10 feet, serving primarily for purposes other than flood control or water supply. With a storage capacity of 3,183 acre-feet and a drainage area of 44.8 square miles, the dam has a low hazard potential but a poor condition assessment as of the last inspection in July 2018.

Despite its poor condition, the dam continues to be regulated and inspected by the Michigan Department of Environment, Great Lakes, and Energy (DEGLE). The structure has undergone modifications in 1963 to improve its structural integrity. The risk assessment categorizes the dam as having very high risk, with measures in place to manage potential hazards. With its controlled spillway and outlet gates, Seney A-1 Pool Dam plays a crucial role in water management and conservation efforts in the region, making it a notable site for water resource and climate enthusiasts to explore and study.

Years Modified

1963 - Structural

Year Completed

1937

Dam Length

19176

Dam Height

13

River Or Stream

GREYS CREEK

Primary Dam Type

Earth

Surface Area

178

Hydraulic Height

10

Drainage Area

44.8

Nid Storage

3183

Structural Height

11

Outlet Gates

Other Controlled

Hazard Potential

Low

Foundations

Soil

Nid Height

13
       
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.