Dane Ridge Watershed Site C-4 Reservoir Report
Last Updated: December 13, 2025
Dane Ridge Watershed Site C-4, located in Crawford County, Iowa, is a vital water resource managed by the local government for fire protection, stock, and small fish pond purposes.
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Summary
Constructed in 1971 by the USDA NRCS, this earth dam stands at a height of 44 feet and spans a length of 542 feet, providing a storage capacity of 130 acre-feet and serving a drainage area of 0.45 square miles. The dam is situated on the TR-Boyer River and is regulated by the Iowa Department of Natural Resources, with state permitting, inspection, and enforcement in place to ensure its safety and functionality.
Despite its low hazard potential and moderate risk assessment rating, Dane Ridge Watershed Site C-4 has not been rated for its condition and lacks updated emergency action plans. The dam features an uncontrolled spillway and has not been modified since its completion. While it currently meets guidelines for risk management, there is room for improvement in terms of emergency preparedness and maintenance. With its strategic location and importance for flood risk reduction and recreation, the watershed site serves as a key asset in the region's water resource management efforts, warranting continued monitoring and investment in its upkeep to ensure long-term sustainability and safety.
Year Completed |
1971 |
Dam Length |
542 |
Dam Height |
44 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
6 |
Drainage Area |
0.45 |
Nid Storage |
130 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
44 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River Near Turin
|
1040cfs |
Soldier River At Pisgah
|
112cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Boyer River At Logan
|
417cfs |
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.
Dane Ridge Watershed Site C-4