Derbyshire Dam dam
Derbyshire Dam
Derbyshire Dam, also known as Lake Sandy Plains Dam, is a private-owned structure located in Polk, North Carolina, specifically in the city of Collinsville. The dam is situated on Hughes Creek and falls under the jurisdiction of the North Carolina Department of Environmental Quality's Dam Safety Program. With a hydraulic height of 30 feet and a structural height of 38 feet, Derbyshire Dam primarily serves as a recreational site, offering opportunities for outdoor enthusiasts to enjoy the surrounding area.
Despite its recreational focus, Derbyshire Dam is classified as having a high hazard potential, although its current condition is assessed as fair. The dam has a storage capacity of 99,999 acre-feet and a drainage area of 934 square miles. Regular inspections are conducted, with the last assessment taking place in March 2020, and an emergency action plan is in place to ensure preparedness in case of any unforeseen events. Overall, Derbyshire Dam stands as a vital component of the water resource infrastructure in the region, providing both recreational amenities and essential safety measures to protect the surrounding communities from potential risks associated with its operation.
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 Derbyshire Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Pacolet River Nr Campobello | 42 cfs | → |
| North Pacolet River At Fingerville | 102 cfs | → |
| Pacolet River Near Fingerville | 74 cfs | → |
| Cove Creek Near Lake Lure | 136 cfs | → |
| Middle Tyger River Near Gramling | 13 cfs | → |
| Second Broad River Nr Logan | 124 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Derbyshire Dam.
Boat launches
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Campgrounds
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Fishing spots
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River runs
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About Derbyshire Dam
Where does the data for Derbyshire 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 High 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 below 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.
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.