Union Grove Silt Containment Dam Reservoir Report
Nearby: Union Grove Lake Dam Deschamp Dam
Last Updated: December 6, 2025
The Union Grove Silt Containment Dam, located in Garwin, Iowa, serves as a critical structure for debris control along the TR-Union Grove Lake.
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Summary
Completed in 1990, this earth dam stands at a height of 17 feet and spans 720 feet in length, with a storage capacity of 249 acre-feet. Managed by the Iowa Department of Natural Resources, the dam is regulated, permitted, inspected, and enforced by the state, ensuring its safety and functionality for water resource management.
With a low hazard potential and a moderate risk assessment rating, the Union Grove Silt Containment Dam plays a vital role in protecting the surrounding area from potential flooding and sediment buildup. Although the dam's condition is currently not rated, its design and construction meet industry standards for debris control purposes. As an essential part of Iowa's water infrastructure, the dam contributes to environmental conservation efforts and helps maintain the integrity of the TR-Union Grove Lake ecosystem.
For water resource and climate enthusiasts, the Union Grove Silt Containment Dam stands as a testament to the importance of sustainable water management practices. As an earth dam with a focus on debris control, it showcases the state's commitment to preserving natural habitats and protecting communities from the impacts of extreme weather events. By staying informed about the dam's operations and maintenance, enthusiasts can contribute to ongoing efforts to safeguard Iowa's water resources for future generations.
Year Completed |
1990 |
Dam Length |
720 |
Dam Height |
17 |
River Or Stream |
TR- UNION GROVE LAKE |
Primary Dam Type |
Earth |
Drainage Area |
1.88 |
Nid Storage |
249 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
17 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Iowa River At Marshalltown
|
1040cfs |
Timber Creek Near Marshalltown
|
37cfs |
Richland Creek Near Haven
|
12cfs |
Wolf Creek Near Dysart
|
35cfs |
Black Hawk Creek At Hudson
|
103cfs |
Salt Creek Near Elberon
|
42cfs |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Union Grove State Park
|
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Wolf Creek Rec Area
|
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Riverview Park - Marshalltown
|
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Otter Creek Lake and Park
|
Union Grove Silt Containment Dam