Parnell Creek Subwatershed Site 8-2 Reservoir Report
Last Updated: December 14, 2025
Parnell Creek Subwatershed Site 8-2 is a key water resource management site located in Woodbury, Iowa, near the Missouri River.
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Summary
Managed by the local government and designed by USDA NRCS, this earth dam structure was completed in 1969 with a primary purpose of fire protection, stock, or small fish pond, along with flood risk reduction. With a height of 49 feet and a length of 460 feet, the dam provides a storage capacity of 202 acre-feet, serving a drainage area of 0.41 square miles.
This site, regulated by the Iowa DNR, features a spillway type of uncontrolled design, with a low hazard potential and a moderate risk assessment rating. While the condition assessment is currently not rated, the structure meets state regulatory requirements for permitting, inspection, and enforcement. The dam's storage capacity, surface area of 7 acres, and normal storage volume of 130 acre-feet contribute to its role in managing water resources in the region, ensuring adequate water supply for various purposes.
Overall, Parnell Creek Subwatershed Site 8-2 plays a vital role in water resource management, providing essential functions such as flood risk reduction and water storage for fire protection and aquatic life support. With its strategic location and design, this earth dam structure serves as a valuable asset in the sustainable management of water resources in the Woodbury County area, showcasing the importance of effective infrastructure in addressing climate-related challenges and ensuring water security for local communities.
Year Completed |
1969 |
Dam Length |
460 |
Dam Height |
49 |
River Or Stream |
GULLY 8 TR-PARNELL CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Drainage Area |
0.41 |
Nid Storage |
202 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
49 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River At Correctionville
|
327cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Missouri River At Decatur
|
14900cfs |
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.
Parnell Creek Subwatershed Site 8-2