Alma Mill 6 Reservoir Report
Nearby: Alma Mill 4 Alma Mill 5
Last Updated: December 5, 2025
Alma Mill 6, also known as Raymond Grob, is a water management structure located in Buffalo, Wisconsin, along the FIMIAN river.
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Summary
Constructed in 1963 by the USDA NRCS, this earth-type dam stands at a height of 28 feet and stretches 696 feet in length, providing debris control and flood risk reduction for the surrounding area. With a storage capacity of 35 acre-feet and the ability to discharge up to 1504 cubic feet per second, Alma Mill 6 plays a crucial role in managing water flow and maintaining safety in the region.
Managed by the Wisconsin Department of Natural Resources, Alma Mill 6 has been classified as having a low hazard potential and fair condition, with a moderate risk assessment rating. Regular inspections are conducted to assess its structural integrity and ensure its continued effectiveness in mitigating potential risks. Although located in a relatively remote area, the dam serves a vital function in protecting downstream communities and infrastructure from potential flooding events.
Owned and regulated by local government authorities, Alma Mill 6 is a key piece of infrastructure in the region's water resource management strategy. With a history dating back to the 1960s, this dam continues to play a crucial role in safeguarding against the impacts of extreme weather events and maintaining the overall resilience of the surrounding ecosystem. For water resource and climate enthusiasts, Alma Mill 6 stands as a testament to the importance of proactive infrastructure planning and maintenance in the face of a changing climate.
Year Completed |
1963 |
Dam Length |
696 |
Dam Height |
28 |
River Or Stream |
FIMIAN |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
28 |
Drainage Area |
1.5 |
Nid Storage |
35 |
Structural Height |
28 |
Hazard Potential |
Low |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Zumbro River At Kellogg
|
1550cfs |
Trempealeau River At Arcadia
|
400cfs |
Chippewa River At Durand
|
3450cfs |
Trempealeau River At Dodge
|
953cfs |
Mississippi River At Winona
|
13700cfs |
Black River Near Galesville
|
862cfs |
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.
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