Big Park Watershed Site D-4 Reservoir Report
Last Updated: December 13, 2025
Big Park Watershed Site D-4 in Iowa, managed by the local government, is a key water resource for the area.
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Summary
This earth dam, designed by USDA NRCS in 1960, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. The dam stands at a height of 39 feet and has a storage capacity of 71 acre-feet, with a surface area of 9 acres and a drainage area of 2 acres.
Located in Crawford County, Iowa, the Big Park Watershed Site D-4 is regulated by the Iowa Department of Natural Resources and undergoes regular inspections and enforcement to ensure its safety and functionality. With a low hazard potential and a moderate risk assessment rating, this dam plays a crucial role in water management for the surrounding area. Despite not being rated for condition assessment, the dam is a vital infrastructure for water resource and climate enthusiasts, contributing to the overall environmental health of the region.
Year Completed |
1960 |
Dam Length |
535 |
Dam Height |
39 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
9 |
Drainage Area |
2 |
Nid Storage |
71 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
39 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Soldier River At Pisgah
|
112cfs |
Boyer River At Logan
|
417cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
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.
Big Park Watershed Site D-4