Big Park Watershed Site D-1 Reservoir Report
Last Updated: December 13, 2025
Big Park Watershed Site D-1 is a vital water resource in Crawford County, Iowa, designed by the USDA NRCS with a primary purpose of fire protection, stock, or small fish pond, as well as flood risk reduction.
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Summary
This earth dam, completed in 1960, stands at a height of 43 feet and has a storage capacity of 68 acre-feet. Situated along the TR-Boyer River, this dam covers a surface area of 4 acres and serves a drainage area of 0.42 square miles.
Managed by the Iowa DNR, Big Park Watershed Site D-1 is regulated and permitted by the state, with inspections and enforcement in place to ensure its safety and functionality. With a low hazard potential and a moderate risk assessment rating of 3, this dam plays a crucial role in water management and protection in the region. While its condition is currently not rated, ongoing monitoring and risk management measures are in place to safeguard this important water infrastructure.
Located in Dow City, Iowa, this watershed site is a testament to the collaborative efforts of local government and federal agencies in safeguarding water resources for various purposes, including fire protection, stock, and flood risk reduction. With a focus on sustainability and risk management, Big Park Watershed Site D-1 stands as a vital component of the water infrastructure in Crawford County, contributing to the overall resilience and conservation of the local ecosystem.
Year Completed |
1960 |
Dam Length |
495 |
Dam Height |
43 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.42 |
Nid Storage |
68 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
43 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Soldier River At Pisgah
|
112cfs |
Boyer River At Logan
|
417cfs |
Maple River At Mapleton
|
323cfs |
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.
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