Big Park Watershed Site C-4 Reservoir Report
Last Updated: December 13, 2025
Located in Crawford County, Iowa, the Big Park Watershed Site C-4 is a crucial resource managed by the local government for fire protection, stock, and small fish pond purposes.
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Summary
Built in 1962 by the USDA NRCS, this earth dam stands at a height of 33 feet and spans 339 feet in length, with a storage capacity of 80 acre-feet. Situated along the TR-Boyer River, this watershed site covers a drainage area of 0.97 square miles and serves as a vital component for flood risk reduction in the region.
With a low hazard potential and moderate risk assessment rating, the Big Park Watershed Site C-4 remains a key asset in water resource management and climate resilience efforts. State-regulated and inspected by the Iowa DNR, this site plays a crucial role in ensuring the safety and security of the surrounding community in Dunlap. Despite its age, the dam has not been rated for condition assessment, highlighting the need for ongoing monitoring and maintenance to uphold its functionality and integrity for the future. As water resource and climate enthusiasts, the preservation and sustainable management of sites like Big Park Watershed C-4 are essential for safeguarding both natural ecosystems and human populations against the impacts of climate change.
Year Completed |
1962 |
Dam Length |
339 |
Dam Height |
33 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
0.97 |
Nid Storage |
80 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
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 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.
Big Park Watershed Site C-4