Garrett Dam Reservoir Report
Last Updated: December 14, 2025
Garrett Dam, located in Crawford County, Iowa, along the TR-Boyer River, was completed in 1967 by the USDA NRCS.
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Summary
This private dam serves multiple purposes, including fire protection, stock, and a small fish pond, with a primary height of 31 feet and a length of 343 feet. It has a storage capacity of 42 acre-feet and covers a surface area of 3 acres, with a drainage area of 0.25 square miles.
Managed by the Iowa DNR, Garrett Dam is classified as a low hazard potential structure with a moderate risk assessment. Despite not being rated for its condition, the dam is regularly inspected and maintained, meeting state regulations and permitting requirements. The spillway is uncontrolled, and the dam is constructed with earth materials on a soil foundation, making it an essential resource for water management and conservation in the region.
Water resource and climate enthusiasts can appreciate Garrett Dam for its role in providing essential services while also being a part of the environmental ecosystem. With its strategic location and design, the dam contributes to the sustainability of the local water supply, wildlife habitat, and flood control efforts. As a privately owned structure, it showcases the importance of collaboration between public and private entities in managing and protecting water resources for future generations.
Year Completed |
1967 |
Dam Length |
343 |
Dam Height |
31 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.25 |
Nid Storage |
42 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River Near Turin
|
1040cfs |
Soldier River At Pisgah
|
112cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Boyer River At Logan
|
417cfs |
West Fork Ditch At Hornick
|
80cfs |
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.
Garrett Dam