Woods Hollow Subwatershed Site 1-2875 Reservoir Report
Last Updated: December 14, 2025
Woods Hollow Subwatershed Site 1-2875 is a dam located in Monona, Iowa, designed by the USDA NRCS and completed in 1960.
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Summary
This earth dam serves multiple purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction. With a height of 26 feet and a storage capacity of 25 acre-feet, this structure plays a crucial role in water resource management in the area.
Situated on the TR- Little Sioux River, Woods Hollow Subwatershed Site 1-2875 is regulated by the Iowa DNR and is subject to state permitting, inspection, and enforcement. Despite its low hazard potential and moderate risk assessment, the condition of the dam has not been rated, and its emergency action plan status is unknown. The dam's spillway type is listed as uncontrolled, with a surface area of 2 acres and a drainage area of 0.35 square miles.
While the dam's primary purpose is to provide essential services to the local community, such as fire protection and stock pond management, it also contributes to flood risk reduction in the area. As a key component of the water resource infrastructure in Monona, Woods Hollow Subwatershed Site 1-2875 serves as a critical asset for climate and water resource enthusiasts interested in understanding and managing the region's water resources effectively.
Year Completed |
1960 |
Dam Height |
26 |
River Or Stream |
TR- LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
0.35 |
Nid Storage |
25 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Soldier River At Pisgah
|
112cfs |
Maple River At Mapleton
|
323cfs |
Missouri River At Decatur
|
14900cfs |
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.
Woods Hollow Subwatershed Site 1-2875