Rock Twp 33 Reservoir Report
Last Updated: December 12, 2025
Rock Twp 33, located in Pipestone, Minnesota, is a privately-owned dam with a primary purpose of flood risk reduction along the East Branch Rock River.
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Summary
This rockfill dam stands at a height of 29.8 feet and has a storage capacity of 17.4 acre-feet. With a low hazard potential, Rock Twp 33 is regulated by the Minnesota Department of Natural Resources and undergoes regular inspections to ensure its structural integrity.
The dam, completed at an unspecified date, covers a surface area of 0.5 acres and has a drainage area of 0.03 square miles. While its condition is currently not rated, Rock Twp 33 is equipped with spillway structures to manage excess water flow during periods of heavy rainfall. The surrounding area is designated for flood risk reduction, emphasizing the importance of this dam in protecting the local community from potential water-related disasters.
Overall, Rock Twp 33 serves as a vital infrastructure for managing water resources and mitigating flood risks in the region. Its strategic location in Edgerton, Minnesota, along with its low hazard potential and state-regulated status, highlights the importance of this dam in safeguarding the surrounding area from the impacts of climate change and extreme weather events.
Dam Length |
250 |
Dam Height |
29.8 |
River Or Stream |
EAST BRANCH ROCK RIVER |
Primary Dam Type |
Rockfill |
Surface Area |
0.5 |
Drainage Area |
0.03 |
Nid Storage |
17.4 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Rock Twp 33