Alma Mill 2 Reservoir Report

Last Updated: December 5, 2025

Alma Mill 2, also known as Lester Jost, is a locally-owned dam in Buffalo, Wisconsin that was completed in 1963 by the USDA NRCS.


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Summary

The dam serves primarily for debris control and flood risk reduction along TR Mill Creek, with a height of 35 feet and a length of 840 feet. The dam has a low hazard potential and is classified as fair in condition, with a moderate risk assessment rating.

Managed by the WIDNR, Alma Mill 2 is designated for state regulation, permitting, inspection, and enforcement, ensuring its safety and compliance with regulations. While the dam has a maximum storage capacity of 40 acre-feet, its normal storage is reported as zero. The structure also features an uncontrolled spillway type and a maximum discharge capacity of 1759 cubic feet per second, along with a drainage area of 1.3 square miles.

Despite its fair condition and moderate risk assessment, Alma Mill 2 remains a vital asset for debris control and flood risk reduction in the area. With its strategic location and design, the dam plays a crucial role in managing water resources and mitigating potential hazards along TR Mill Creek, benefiting both the environment and surrounding communities in Buffalo, Wisconsin.

Years Modified

2002 - Other

Year Completed

1963

Dam Length

840

Dam Height

35

River Or Stream

TR MILL CREEK

Primary Dam Type

Earth

Surface Area

2

Hydraulic Height

29

Drainage Area

1.3

Nid Storage

40

Structural Height

35

Hazard Potential

Low

Nid Height

35
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.