Big Park Watershed Site F-1 Reservoir Report
Last Updated: December 13, 2025
Big Park Watershed Site F-1 in Crawford, Iowa, is a locally owned water management structure designed by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
Completed in 1965, this Earth-type dam stands at a height of 35 feet and spans 395 feet, with a storage capacity of 80 acre-feet. Situated on the TR-Boyer River, this dam serves to reduce flood risks and provide recreational opportunities to the community. Despite its low hazard potential, the dam's condition assessment remains unrated, emphasizing the need for regular inspections and maintenance to ensure its long-term effectiveness.
Managed by the Iowa DNR and located in Dow City, this watershed site plays a crucial role in regulating water flow and preserving the surrounding ecosystem. With a drainage area of 0.32 square miles and a surface area of 4 acres, the dam helps control water levels and protect downstream areas from potential inundation. Although the dam's spillway is uncontrolled, its moderate risk assessment rating suggests the need for proactive risk management measures to mitigate any potential hazards and ensure the safety of the local community.
As part of the Rock Island District, Big Park Watershed Site F-1 stands as a testament to the importance of sustainable water resource management in the face of changing climate conditions. With its historical significance and ongoing role in water conservation efforts, this dam serves as a valuable asset for both flood control and recreational purposes, highlighting the vital connection between water resources and climate resilience in the region.
Year Completed |
1965 |
Dam Length |
395 |
Dam Height |
35 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.32 |
Nid Storage |
80 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
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 F-1