State Street Dam Reservoir Report

Last Updated: December 5, 2025

State Street Dam, also known as Alma Dam, is a gravity-type dam located on the Pine River in Alma, Michigan.


°F

°F

mph

Wind

%

Humidity

Summary

Completed in 1938, this dam primarily serves the purpose of water supply, with a maximum storage capacity of 1500 acre-feet and a normal storage capacity of 600 acre-feet. The dam is regulated by the Michigan Department of Environment, Great Lakes, and Energy (DEGLE), with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations.

Standing at a height of 18 feet and a length of 355 feet, State Street Dam has a controlled spillway with a width of 97 feet to manage maximum discharge of 5000 cubic feet per second. Despite being assessed as having significant hazard potential, the dam's condition is deemed satisfactory as of the last inspection in May 2018. With a very high risk rating, measures for risk management and emergency preparedness are crucial for this structure, although details on emergency action plans and risk mitigation strategies are currently not specified.

Overall, State Street Dam plays a critical role in water resource management for the local community, highlighting the importance of maintaining its structural integrity and implementing effective risk management practices to ensure the safety of residents and the surrounding environment in the face of potential hazards and emergencies.

Year Completed

1938

Dam Length

355

Dam Height

18

River Or Stream

Pine River

Primary Dam Type

Gravity

Surface Area

140

Hydraulic Height

18.2

Drainage Area

308

Nid Storage

1500

Structural Height

18

Hazard Potential

Significant

Nid Height

18
       
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.