Whidby Structnot Ratede 20 dam
Whidby Structnot Ratede 20
Whidby Structure 20, located in South Dakota along the TR-White River, is a private earth dam with a height of 24 feet and a length of 400 feet. Completed in 1966, this structure has a storage capacity of 128 acre-feet and a maximum discharge of 1050 cubic feet per second. Despite its significant hazard potential, the condition of Whidby Structure 20 is currently not rated, and it is regulated and inspected by the state's Department of Environment and Natural Resources.
Owned privately and designed by the Natural Resources Conservation Service, Whidby Structure 20 plays a vital role in water resource management in Jackson County, South Dakota. While its emergency action plan status and risk assessment details are not provided in the available data, the structure's importance in flood control and water supply for the area cannot be overstated. With its location within the St. Paul District of the US Army Corps of Engineers, Whidby Structure 20 stands as a key component in the region's overall water infrastructure.
As a crucial component of the local water management system, Whidby Structure 20 serves as a critical piece of infrastructure in South Dakota's efforts to mitigate flood risks and ensure water availability for various purposes. With its state-regulated status, inspection protocols, and significant hazard potential, this structure highlights the ongoing challenges and importance of maintaining and monitoring water resources in the face of changing climate conditions. For water resource and climate enthusiasts, Whidby Structure 20 represents a case study in the intersection of infrastructure, regulation, and environmental stewardship.
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 Whidby Structnot Ratede 20 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| White R Near Kadoka Sd | 83 cfs | → |
| Black Pipe Creek Nr Belvidere | 13 cfs | → |
| South Fork Bad R Near Cottonwood Sd | · | → |
| White R Near Interior Sd | 48 cfs | → |
| Bear In The Lodge Cr Near Wanblee Sd | 12 cfs | → |
| Little White R Below White River Sd | 112 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Whidby Structnot Ratede 20.
Track Whidby Structnot Ratede 20 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 Whidby Structnot Ratede 20
Where does the data for Whidby Structnot Ratede 20 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 Significant 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 Whidby Structnot Ratede 20.