Mill Picayune Watershed Site S-4 Reservoir Report
Nearby: Mill Picayune Watershed Site S-1
Last Updated: December 14, 2025
Mill Picayune Watershed Site S-4, located in Woodbine, Iowa, is a key part of the South Picayune Creek watershed, managed by the local government with assistance from the USDA NRCS.
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Summary
This earth dam, completed in 1991, stands at 29 feet tall and stretches 410 feet in length, providing flood risk reduction and other purposes for the surrounding area. With a drainage area of 4.48 square miles and a storage capacity of 112 acre-feet, this site plays a crucial role in managing water resources in the region.
The dam at Mill Picayune Watershed Site S-4 is regulated by the Iowa DNR and undergoes regular inspections and enforcement to ensure its structural integrity and safety. Despite its low hazard potential, the risk assessment for this site is moderate. While the condition assessment is currently not rated, the dam's design, location, and purpose make it an essential component of water resource management in Harrison County, Iowa.
As a part of the Rock Island District, this watershed site serves as a model for effective water resource management, showcasing the collaboration between local and federal agencies. With its controlled spillway and soil foundation, the dam at S-4 provides a critical buffer against flooding while also supporting the ecological health of the surrounding area. For water resource and climate enthusiasts, Mill Picayune Watershed Site S-4 represents a prime example of sustainable infrastructure that balances human needs with environmental stewardship.
Year Completed |
1991 |
Dam Length |
410 |
Dam Height |
29 |
River Or Stream |
SOUTH PICAYUNE CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
4.48 |
Nid Storage |
112 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
29 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
West Nishnabotna River At Hancock
|
154cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Maple River At Mapleton
|
323cfs |
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.
Mill Picayune Watershed Site S-32-1