Mill Picayune Watershed Site M-27-1 Reservoir Report
Last Updated: December 13, 2025
The Mill Picayune Watershed Site M-27-1 in Crawford County, Iowa, is a local government-owned dam designed by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
Completed in 1961, this earth dam stands at a height of 40 feet and spans a length of 450 feet, with a storage capacity of 79 acre-feet and a surface area of 3.2 acres. Situated on TR-Mill Creek, this dam is regulated by the Iowa DNR and is inspected, permitted, and enforced by state authorities to ensure its safety and functionality.
Despite its low hazard potential and moderate risk assessment, the condition of the Mill Picayune Watershed Site M-27-1 has not been rated due to a lack of recent assessments. The dam features an uncontrolled spillway and soil foundation, with a drainage area of 0.29 square miles. The site has not undergone modifications in recent years, and there are no associated structures or outlet gates. While the dam has not been evaluated for emergency action plan compliance, it is essential for flood risk reduction in the area, highlighting its importance for water resource and climate management enthusiasts.
Year Completed |
1961 |
Dam Length |
450 |
Dam Height |
40 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
3.2 |
Drainage Area |
0.29 |
Nid Storage |
79 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
40 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
Maple River At Mapleton
|
323cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
West Nishnabotna River At Hancock
|
154cfs |
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 M-27-1