Floyd Sletto Reservoir Report
Nearby: Bill Bnot Ratedtz 1 Alfred Hutchinson
Last Updated: December 13, 2025
Floyd Sletto is a privately owned earth dam located in Lyman, South Dakota, along the White River offstream.
°F
°F
mph
Wind
%
Humidity
Summary
Constructed in 1972 by the Natural Resources Conservation Service, this dam stands at a height of 31 feet and stretches 277 feet in length. With a storage capacity of 26 acre-feet, it serves the primary purpose of water resource management in the region.
Managed and regulated by the South Dakota Department of Environment and Natural Resources, Floyd Sletto is classified as having a low hazard potential. Despite its condition being marked as "Not Rated," the dam undergoes regular inspections, permitting, and enforcement to ensure its structural integrity and safety. Additionally, the dam has not yet been assessed for emergency action plans and risk management measures, highlighting the need for continued monitoring and assessment of its potential risks.
Floyd Sletto plays a vital role in water resource management in the area, with a maximum discharge capacity of 630 cubic feet per second. As a key infrastructure for the surrounding community, the dam underscores the importance of sustainable water resource practices and climate resilience in the face of changing environmental conditions.
Year Completed |
1972 |
Dam Length |
277 |
Dam Height |
31 |
River Or Stream |
WHITE RIVER OFFSTREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
31 |
Nid Storage |
26 |
Hazard Potential |
Low |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White R Near Oacoma Sd
|
105cfs |
White River Near White River
|
42cfs |
Little White R Below White River Sd
|
141cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
Little White R Near Rosebud Sd
|
96cfs |
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.
Floyd Sletto