Molstad Lake Reservoir Report
Nearby: Ted Molstad Dam Robert Bolander
Last Updated: December 13, 2025
Molstad Lake, located in Walworth, South Dakota, is a state-regulated water resource that was completed in 1940 by the Works Progress Administration (WPA).
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Summary
This earth dam structure stands at 19 feet in height and spans 2080 feet in length, with a maximum storage capacity of 2080 acre-feet and a normal storage level of 623 acre-feet. The dam's primary purpose and associated structures are not specified, but it serves as an important water source for the surrounding area.
With a low hazard potential and a moderate risk assessment rating, Molstad Lake is equipped with an uncontrolled spillway that is 66 feet wide. Despite its condition being labeled as "Not Rated," the dam undergoes regular state inspection and enforcement to ensure its safety and functionality. The inspection frequency is set at every 3 years, with the last inspection conducted in September 2019. This water resource is a critical component of the local water infrastructure, supporting the community with its water storage and flood control capabilities.
Managed by the South Dakota Department of Agriculture and Natural Resources (DANR), Molstad Lake plays a crucial role in the region's water management system. The dam's location along the TR MISSONot RatedI river/stream and its proximity to the St. Paul District of the US Army Corps of Engineers underscore its significance in regulating water flow and providing essential services to the area. For water resource and climate enthusiasts, Molstad Lake offers a fascinating glimpse into the intersection of infrastructure, natural resources, and environmental stewardship in South Dakota.
Year Completed |
1940 |
Dam Length |
2080 |
Dam Height |
19 |
River Or Stream |
TR MISSONot RatedI |
Primary Dam Type |
Earth |
Hydraulic Height |
19 |
Drainage Area |
24 |
Nid Storage |
2080 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
19 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Oak Cr Near Wakpala Sd
|
10cfs |
Grand R At Little Eagle Sd
|
47cfs |
Moreau R Near Whitehorse Sd
|
35cfs |
Beaver Creek Bl Linton
|
39cfs |
Cedar Creek Nr Raleigh
|
20cfs |
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.
Molstad Lake