Big Park Watershed Site F-2 Reservoir Report
Last Updated: December 13, 2025
Big Park Watershed Site F-2, located in Dow City, Iowa, is a critical resource for fire protection, livestock, and small fish pond purposes.
°F
°F
mph
Wind
%
Humidity
Summary
Managed by the USDA NRCS, this earth dam stands at a height of 45 feet and stretches 646 feet in length, with a storage capacity of 184 acre-feet. With a low hazard potential and moderate risk assessment, this dam on the TR-Boyer River serves as a key component in flood risk reduction efforts in the area.
Constructed in 1970, this dam plays a vital role in safeguarding the surrounding Crawford County area from potential flooding events. With a drainage area of 0.88 square miles and a normal storage capacity of 83 acre-feet, this structure also offers recreational opportunities for the community. Despite not being rated for its condition, the dam at Big Park Watershed Site F-2 is subject to state regulation and inspection, ensuring its continued functionality and safety for the local residents and ecosystem.
As part of the Rock Island District, this site is a testament to effective water resource management and environmental stewardship in Iowa. With the support of the Iowa DNR and other state agencies, the dam at Big Park Watershed Site F-2 represents a collaborative effort to protect and preserve the region's water resources for future generations.
Year Completed |
1970 |
Dam Length |
646 |
Dam Height |
45 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
9 |
Drainage Area |
0.88 |
Nid Storage |
184 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
45 |
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-2