Big Park Watershed Site C-3 Reservoir Report
Last Updated: December 13, 2025
Big Park Watershed Site C-3 is a key water resource structure located in Crawford County, Iowa, specifically in the city of Dunlap.
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Summary
This earth dam, completed in 1962, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a dam height of 35 feet and a storage capacity of 61 acre-feet, this structure plays a crucial role in managing water resources in the area.
Managed by the USDA NRCS and regulated by the Iowa DNR, Big Park Watershed Site C-3 is designed to withstand low hazard potential and has a moderate risk assessment rating. Despite its importance, the condition assessment for this structure is currently not rated, highlighting the need for regular inspections and maintenance to ensure its effectiveness in mitigating potential risks and protecting the surrounding environment.
Located along the TR-Boyer River, this site is a valuable asset for the community and the environment. With its strategic placement and multi-functional design, Big Park Watershed Site C-3 exemplifies the importance of proper water resource management in the face of changing climate patterns and increasing pressures on our natural ecosystems.
Year Completed |
1962 |
Dam Length |
252 |
Dam Height |
35 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.72 |
Nid Storage |
61 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Soldier River At Pisgah
|
112cfs |
Maple River At Mapleton
|
323cfs |
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 C-3