Summary
Built in 1968 by the USDA NRCS, this earth dam structure serves a primary purpose that is categorized as 'Other'. The pond has a height of 13 feet and a length of 400 feet, with a storage capacity of 250 acre-feet and a drainage area of 6 square miles. The Otter Tail River feeds into the pond, which has a low hazard potential and is deemed to be in satisfactory condition as of its last assessment in 2009.
Despite its uncontrolled spillway and outlet gates, Lehmann Pond poses a moderate risk factor of 3, according to a risk assessment. The structure is inspected every 8 years, with the last assessment taking place in August 2018. While the pond does not have an Emergency Action Plan (EAP) in place, it meets regulatory guidelines set by the state of Minnesota, as it is regulated, permitted, inspected, and enforced by the Minnesota Department of Natural Resources. With its peaceful surroundings and important role in water resource management, Lehmann Pond is a significant landmark for water resource and climate enthusiasts to explore and appreciate in the pristine wilderness of Minnesota.
Year Completed |
1968 |
Dam Length |
400 |
Dam Height |
12 |
River Or Stream |
OTTER TAIL RIVER-TR |
Primary Dam Type |
Earth |
Surface Area |
12 |
Drainage Area |
6 |
Nid Storage |
250 |
Structural Height |
13 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
13 |
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.
Lehmann Pond