Harold Arnold dam
Harold Arnold
Harold Arnold, located in Corson, South Dakota, is a privately owned Earth dam completed in 1950 with a height of 17 feet and a length of 600 feet. This dam, situated on the TR-HUMP river or stream, has a storage capacity of 73 acre-feet and a maximum discharge of 397 cubic feet per second. Despite its low hazard potential, the dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and undergoes regular inspections, permitting, and enforcement to ensure its safety and compliance with state regulations.
Managed by private owners, Harold Arnold plays a crucial role in water resource management in the region, providing flood control and water storage benefits. While the dam's condition is currently not rated and there is no Emergency Action Plan (EAP) in place, its proximity to the St. Paul District of the US Army Corps of Engineers highlights its importance in the overall water infrastructure network. With its strategic location and capacity to mitigate risks associated with extreme weather events, Harold Arnold serves as a vital asset for climate resilience and water resource sustainability in South Dakota.
As a key component of the local water management system, Harold Arnold contributes to the overall water supply, aquatic habitat preservation, and flood risk reduction efforts in the area. Its historical significance, dating back to the mid-20th century, underscores the importance of maintaining and monitoring aging infrastructure for climate adaptation and resilience. Water resource and climate enthusiasts can appreciate the role of Harold Arnold in safeguarding communities and ecosystems against the impacts of changing weather patterns and increasing water variability in the region.
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 Harold Arnold -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Cedar Creek Nr Raleigh | 20 cfs | → |
| Cannonball River Nr Raleigh | 16 cfs | → |
| Grand R At Little Eagle Sd | 64 cfs | → |
| Oak Cr Near Wakpala Sd | 10 cfs | → |
| Moreau R Near Whitehorse Sd | 55 cfs | → |
| Cannonball River At Breien | 49 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Harold Arnold.
Track Harold Arnold 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 Harold Arnold
Where does the data for Harold Arnold 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 Harold Arnold.