Isu Dam Reservoir Report
Nearby: Mc Farland Lake Dam Arnold Lake Dam
Last Updated: December 13, 2025
Isu Dam, located in Ames, Iowa, along the Skunk River, was completed in 1958 for the primary purposes of fire protection, stock, and small fish pond.
°F
°F
mph
Wind
%
Humidity
Summary
This earth dam, designed by USDA NRCS, stands at a height of 37 feet and stretches 460 feet in length, with a storage capacity of 170 acre-feet. Although it is classified as having a low hazard potential, the dam is regulated, permitted, inspected, and enforced by the Iowa DNR, ensuring its safe operation and maintenance.
With a moderate risk assessment rating, Isu Dam has not been rated for its condition assessment. Despite this, the dam's location in Story County holds significance for water resource and climate enthusiasts, as it plays a vital role in managing water resources and supporting local ecosystems. The dam's controlled release through an uncontrolled spillway helps mitigate flood risks and provides valuable water storage for agricultural and environmental purposes.
As a key structure in the Rock Island District, Isu Dam serves as a critical element in the region's water management infrastructure. Its historical significance, coupled with its ongoing role in protecting the local community and supporting diverse water uses, makes Isu Dam a fascinating subject for those interested in water resource management and climate resilience efforts in Iowa.
Year Completed |
1958 |
Dam Length |
460 |
Dam Height |
37 |
River Or Stream |
TR- SKUNK RIVER |
Primary Dam Type |
Earth |
Surface Area |
12.5 |
Drainage Area |
0.73 |
Nid Storage |
170 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
37 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Skunk River Near Ames
|
92cfs |
Squaw Creek At Ames
|
53cfs |
South Skunk River Below Squaw Creek Near Ames
|
130cfs |
Des Moines River Near Stratford
|
1720cfs |
Boone River Near Webster City
|
232cfs |
Indian Creek Near Mingo
|
79cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Isu Dam