Mill Picayune Watershed Site M-29-2 Reservoir Report
Last Updated: December 13, 2025
Located in Crawford County, Iowa, the Mill Picayune Watershed Site M-29-2 is a significant earth dam completed in 1967 by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
With a dam height of 47 feet and a length of 450 feet, this structure holds a storage capacity of 78 acre-feet and serves a drainage area of 0.36 square miles along TR-Mill Creek. Managed by the Iowa DNR and deemed to have low hazard potential, this dam plays a crucial role in flood risk reduction within the region.
Despite being designated as "Not Rated" in terms of its condition assessment, the Mill Picayune Watershed Site M-29-2 is considered to have a moderate risk level. While it lacks certain emergency preparedness features such as an Emergency Action Plan and inundation maps, its overall risk management measures remain undisclosed. With its primary purpose centered on water resource management, this dam site stands as a testament to the collaborative efforts between local government agencies and the USDA NRCS in safeguarding the environmental and hydrological welfare of the area. For water resource and climate enthusiasts, this site offers a glimpse into the intricate balance between human development and natural resource preservation.
Year Completed |
1967 |
Dam Length |
450 |
Dam Height |
47 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.36 |
Nid Storage |
78 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
47 |
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-29-2