Lewandowski Dam dam
Lewandowski Dam
Lewandowski Dam, located on the TR.-LITTLE MINNESOTA RIVER in Roberts, South Dakota, is a privately owned structure designed by USDA NRCS and completed in 2006. This earth dam stands at a height of 29 feet, with a storage capacity of 33 acre-feet and a maximum discharge of 325 cubic feet per second. The dam serves a primary purpose of water resource management, with a low hazard potential and a moderate risk assessment rating.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Lewandowski Dam is regulated, permitted, inspected, and enforced by the state. The dam features an uncontrolled spillway with a width of 24 feet and does not have outlet gates. Despite being in good condition and not rated for condition assessment, the structure's risk management measures and emergency action plan status remain undisclosed. Its location within the Omaha District further underscores its importance in mitigating the impact of climate change on water resources in the region.
Overall, Lewandowski Dam plays a crucial role in water resource management and climate resilience efforts in South Dakota. As a vital structure along the TR.-LITTLE MINNESOTA RIVER, it stands as a testament to the collaboration between private owners, government agencies, and design entities in safeguarding the local community against potential water-related hazards. With its strategic placement and functional design, the dam serves as a valuable asset in regulating water flow, storing essential water resources, and maintaining the ecological balance of the surrounding area.
Dam data reference
Condition Assessment
- Satisfactory
- No 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.
- 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.
- 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.
Hazard Potential Classification
- High
- Dams 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, environmental 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.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Lewandowski Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Little Minnesota River Near Peever | 56 cfs | → |
| Bois De Sioux River Near White Rock | 96 cfs | → |
| Whetstone River Near Big Stone City | 64 cfs | → |
| Minnesota River At Ortonville | 81 cfs | → |
| Big Sioux River Nr Florence Sd | 7 cfs | → |
| Yellow Bank River Near Odessa | 69 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lewandowski Dam.
Boat launches
- Mn 27 4906, Traverse County
- Mn 27 4924, Traverse County
- T149 5800, Traverse County
- Roberts County
- Rocky Point Big Stone City
- Roy Lake State Park
Track Lewandowski Dam in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Lewandowski Dam
Where does the data for Lewandowski Dam come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Low hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Lewandowski Dam.