Maas Detention Reservoir Report
Last Updated: December 6, 2025
Maas Detention, located in Faribault, Minnesota, was designed by the USDA NRCS and is owned by a private entity.
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Summary
This earth dam was completed in 1993 and serves the primary purpose of flood risk reduction along the Mud Creek-TR. With a dam height of 30 feet and a length of 260 feet, Maas Detention has a storage capacity of 21.1 acre-feet and a drainage area of 0.6 square miles. Despite its low hazard potential, the dam has a moderate risk assessment rating of 3, indicating the need for ongoing monitoring and maintenance.
Managed by the MNDNR EWR, Maas Detention is equipped with uncontrolled spillways and outlet gates. The dam's overall condition was last assessed in July 2017 and deemed satisfactory. While the structure has not been modified in recent years, regular inspections are conducted every 8 years to ensure its continued safety and effectiveness. The risk management measures and emergency action plan for the dam are currently unspecified, highlighting the importance of proactive planning and coordination in the face of potential climate-related challenges.
As part of the Rock Island District, Maas Detention plays a crucial role in protecting the surrounding area from flooding events. Its strategic location in Rice County, Minnesota, underscores the significance of water resource management in mitigating climate-related risks. With its effective flood risk reduction capabilities and commitment to regulatory compliance, Maas Detention stands as a testament to the importance of sustainable water infrastructure in adapting to a changing climate and safeguarding communities against natural disasters.
Year Completed |
1993 |
Dam Length |
260 |
Dam Height |
30 |
River Or Stream |
MUD CREEK-TR |
Primary Dam Type |
Earth |
Surface Area |
1 |
Drainage Area |
0.6 |
Nid Storage |
21.1 |
Structural Height |
34 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
34 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Straight River Near Faribault
|
83cfs |
Vermillion River Near Empire
|
40cfs |
Cannon River At Welch
|
384cfs |
Minnesota River Near Jordan
|
2960cfs |
Minnesota River At Mankato
|
3240cfs |
Le Sueur River Near Rapidan
|
179cfs |
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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