Mill Picayune Watershed Site S-8-2 Reservoir Report
Last Updated: December 14, 2025
Located in Harrison, Iowa, the Mill Picayune Watershed Site S-8-2 is a crucial water resource managed by the local government and designed by the USDA NRCS.
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Summary
This site serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. Completed in 1984, the earth dam stands at a height of 48 feet and has a storage capacity of 123 acre-feet, with a normal storage of 58 acre-feet over a surface area of 3.8 acres.
This watershed site on the TR-S. Picayune Creek is regulated by the Iowa DNR and is subjected to inspections, permitting, and enforcement by the state. With a low hazard potential and a moderate risk assessment, the site has not been rated for its condition but meets guidelines for emergency action planning. The dam's uncontrolled spillway type and lack of outlet gates indicate a need for continual monitoring and maintenance to prevent potential risks associated with flooding or dam failure.
As a part of the Rock Island District, the Mill Picayune Watershed Site S-8-2 plays a vital role in water resource management in the region. Enthusiasts interested in climate and water resources will appreciate the site's design and purpose, as well as the efforts taken by local and state agencies to ensure its safe operation and management for the community.
Year Completed |
1984 |
Dam Length |
600 |
Dam Height |
48 |
River Or Stream |
TR- S. PICAYUNE CR. |
Primary Dam Type |
Earth |
Surface Area |
3.8 |
Drainage Area |
0.3 |
Nid Storage |
123 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
48 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
West Nishnabotna River At Hancock
|
154cfs |
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-8-2