Neilsen #1 dam
Neilsen #1
Neilsen #1 is a privately owned dam located in Mellette, South Dakota, along TR Cottonwood Creek offstream. The dam, completed in 1968, stands at a height of 35 feet and has a storage capacity of 75 acre-feet. It serves a low hazard potential and has not been rated for its condition assessment. Despite being owned privately, the state of South Dakota regulates and inspects the dam regularly to ensure its safety and compliance with state regulations.
The dam's primary purpose and associated structures are not specified in the data, but it is important to note that the dam plays a crucial role in water resource management in the area. With a maximum discharge capacity of 1037 cubic feet per second, Neilsen #1 helps in controlling water flow and preventing flooding in the region. Its presence also contributes to the overall ecological balance of the surrounding environment, demonstrating the intersection of water resource management and climate resilience in South Dakota.
As a key infrastructure in the state, Neilsen #1 underscores the importance of maintaining and monitoring dams for water resource sustainability and climate adaptation. With its low hazard potential and regulatory oversight by the South Dakota Department of Environment and Natural Resources, the dam serves as a vital component in the local water management system. It is essential for water resource and climate enthusiasts to recognize the significance of structures like Neilsen #1 in ensuring the resilience of communities and ecosystems in the face of changing climate conditions.
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 Neilsen #1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Little White R Below White River Sd | 112 cfs | → |
| White River Near White River | 40 cfs | → |
| Little White R Near Rosebud Sd | 141 cfs | → |
| Black Pipe Creek Nr Belvidere | 13 cfs | → |
| White R Near Kadoka Sd | 83 cfs | → |
| Little White R Near Vetal Sd | 128 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Neilsen #1.
Track Neilsen #1 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 Neilsen #1
Where does the data for Neilsen #1 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 Neilsen #1.