Seney I-1 Pool Dam Reservoir Report

Last Updated: December 5, 2025

The Seney I-1 Pool Dam, located in Schoolcraft, Michigan, was completed in 1937 by the USDI NWS Branch of Engineering for the primary purpose of creating a Fish and Wildlife Pond.


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Summary

This earth dam stands at a height of 8 feet and spans 6765 feet in length, with a maximum storage capacity of 492 acre-feet. The dam, regulating the flow of the Holland Ditch, has a controlled spillway and a low hazard potential, making it a vital structure for managing water resources in the area.

Despite its historical significance, the Seney I-1 Pool Dam is currently in poor condition, as assessed in 2018. The dam poses a very high risk due to its condition, prompting the need for immediate attention and maintenance to ensure its continued functionality and safety. With the state of Michigan regulating and inspecting the dam regularly, there is a commitment to addressing any concerns and mitigating potential risks to the surrounding community and environment. As a key component in supporting fish and wildlife habitats, as well as recreational activities, the Seney I-1 Pool Dam serves as an essential water resource infrastructure in the region.

Years Modified

1954 - Structural

Year Completed

1937

Dam Length

6765

Dam Height

8

River Or Stream

HOLLAND DITCH

Primary Dam Type

Earth

Surface Area

129

Hydraulic Height

8

Drainage Area

0.63

Nid Storage

492

Structural Height

9

Hazard Potential

Low

Foundations

Soil

Nid Height

9
       
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.