Grote Dam Reservoir Report
Last Updated: December 13, 2025
Grote Dam, located in Woodbine, Iowa, is a privately owned structure designed by the USDA NRCS for fire protection and as a stock or small fish pond.
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Summary
Completed in 1974, this earth dam stands at a height of 30 feet and spans 430 feet in length, with a storage capacity of 45 acre-feet. The dam is situated on the TR-Boyer River and is regulated by the Iowa DNR, with state permitting, inspection, and enforcement in place to ensure its safety and compliance.
Despite its low hazard potential, Grote Dam is considered to have a moderate risk level, with a risk assessment rating of 3. The dam is equipped with an uncontrolled spillway and is surrounded by a drainage area of 0.31 square miles. While the condition assessment is currently not rated, the dam's emergency action plan status, including its preparedness and adherence to guidelines, is not specified in the available data. With its strategic location and purposeful design, Grote Dam serves as a vital resource for water management and conservation in the region, highlighting the intersection of water resources and climate considerations.
Year Completed |
1974 |
Dam Length |
430 |
Dam Height |
30 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.31 |
Nid Storage |
45 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Maple River At Mapleton
|
323cfs |
West Nishnabotna River At Hancock
|
154cfs |
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.
Grote Dam