Ralph Hedman dam
Ralph Hedman
Ralph Hedman, a private earth dam located in Stanley, South Dakota, stands as a crucial water resource structure along the TRIB. PLUM CREEK tributary. Constructed in 1958 by the Natural Resources Conservation Service, this dam boasts a height of 27 feet and a length of 660 feet, providing a storage capacity of 102 acre-feet for the surrounding area. With a significant hazard potential, this dam is regulated and inspected by the South Dakota Department of Environment and Natural Resources to ensure its structural integrity and safety.
Despite its age, Ralph Hedman remains in "Not Rated" condition, reflecting the need for ongoing assessment and maintenance to uphold its functionality and safety standards. The dam's emergency action plan status and risk assessment measures are currently unspecified, raising questions about preparedness in the event of a crisis. As a water resource and climate enthusiast, staying informed about the condition and management of dams like Ralph Hedman is essential for understanding their impact on local ecosystems and communities.
As water resource and climate enthusiasts, it is imperative to advocate for the proper management and maintenance of essential structures like Ralph Hedman to mitigate potential risks and ensure their long-term sustainability. By monitoring regulatory agencies' oversight and the dam's condition assessment, stakeholders can play a role in promoting responsible stewardship of water resources in South Dakota. Engaging with local authorities and staying informed about emergency preparedness measures can help safeguard against the potential hazards posed by aging infrastructure like Ralph Hedman.
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 Ralph Hedman -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Bad R Near Fort Pierre Sd | 4 cfs | → |
| Black Pipe Creek Nr Belvidere | 13 cfs | → |
| Cheyenne R Near Plainview Sd | 320 cfs | → |
| South Fork Bad R Near Cottonwood Sd | · | → |
| White River Near White River | 40 cfs | → |
| White R Near Kadoka Sd | 83 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Ralph Hedman.
Track Ralph Hedman 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 Ralph Hedman
Where does the data for Ralph Hedman 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 Ralph Hedman.