Green Dam Reservoir Report

Last Updated: December 9, 2025

Green Dam, located in Medora, Iowa, is a local government-owned earth dam completed in 1972 for fire protection, stock, and small fish pond purposes.


°F

°F

mph

Wind

%

Humidity

Summary

With a height of 25 feet and a length of 390 feet, Green Dam has a storage capacity of 40 acre-feet and a surface area of 4 acres, serving as a vital water resource in the region. The dam is regulated by the Iowa Department of Natural Resources and meets state permitting, inspection, and enforcement requirements.

Despite its low hazard potential and moderate risk assessment, Green Dam's condition assessment is currently not rated, highlighting the need for ongoing monitoring and maintenance to ensure its structural integrity and safety. The dam features an uncontrolled spillway and is situated on the TR-Squaw Creek, contributing to the drainage area of 0.17 square miles. With its strategic location and crucial role in water management, Green Dam serves as a key asset for flood control and water storage in Clarke County, Iowa. Climate and water resource enthusiasts can appreciate the significance of Green Dam in protecting local communities and supporting ecological sustainability.

Year Completed

1972

Dam Length

390

Dam Height

25

River Or Stream

TR-SQUAW CREEK

Primary Dam Type

Earth

Surface Area

4

Drainage Area

0.17

Nid Storage

40

Hazard Potential

Low

Foundations

Soil

Nid Height

25
       
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.