Saganashkee Slough 2 Dam Reservoir Report

Last Updated: December 5, 2025

Saganashkee Slough 2 Dam, located in Cook County, Illinois, along the Trib Calumet Sag Channel, was completed in 1948 and serves a primary purpose of recreation.


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Summary

Owned by the local government, this earth dam with a height of 8 feet and length of 30 feet provides a storage capacity of 2375 acre-feet, with a normal storage level of 718 acre-feet. Despite its low hazard potential, the dam is regulated by the Illinois Department of Natural Resources and undergoes periodic inspections to ensure its structural integrity.

Designed by Warren & Van Praag & C.S. Engineer, the Saganashkee Slough 2 Dam is a vital component of the local water resource infrastructure, offering recreational opportunities and contributing to the overall water management in the area. With no spillway present, the dam's risk assessment indicates a high level of risk (2), prompting the need for ongoing risk management measures to mitigate potential hazards. While the condition assessment is currently not available, the dam's emergency action plan status and inundation mapping preparedness remain undisclosed, highlighting areas for potential improvement in emergency response protocols.

As a key feature along the waterway, Saganashkee Slough 2 Dam plays a significant role in the local ecosystem and provides valuable recreational amenities for residents and visitors alike. With a notable history dating back to its construction in the mid-20th century, the dam continues to be a focal point for water resource and climate enthusiasts interested in understanding the intersection of infrastructure, recreation, and environmental stewardship in the region. Ongoing monitoring and management efforts ensure the dam's continued safety and functionality for the community it serves.

Year Completed

1948

Dam Length

30

Dam Height

8

River Or Stream

TRIB CALUMET SAG CHANNEL

Primary Dam Type

Earth

Nid Storage

2375

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

8
       
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.