Knollwood Dam 2 dam
Knollwood Dam 2
Knollwood Dam 2, located in Williamsburg, South Carolina, was completed in 1968 and serves multiple purposes including fire protection, stock, small fish pond, and recreation. This privately owned Earth dam stands at a height of 19 feet with a length of 405 feet, providing a storage capacity of 106 acre-feet. The dam is situated on the Walnut Branch river and is regulated by the South Carolina Department of Health and Environmental Control (SC DHEC), ensuring regular inspections and enforcement to maintain its structural integrity.
With a low hazard potential and fair condition assessment, Knollwood Dam 2 poses minimal risk to surrounding areas. Despite its age, the dam meets regulatory guidelines and has undergone inspections as recent as October 2017. The controlled spillway design ensures efficient water flow management, further reducing the risk of potential flooding. Additionally, the dam's location in a very high-risk area (risk level 1) highlights the importance of ongoing risk management measures to safeguard the surrounding community and environment from any unforeseen events.
For water resource and climate enthusiasts, Knollwood Dam 2 presents an intriguing case study of a privately owned dam with a diverse range of functions and a relatively low hazard potential. Its location in a high-risk area underscores the critical role of effective risk management and maintenance practices in ensuring the safety and sustainability of such infrastructure. As climate change continues to impact water resources, the management of dams like Knollwood Dam 2 will be essential in mitigating potential risks and adapting to changing environmental 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 Knollwood Dam 2 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Santee River Near Pineville | 680 cfs | → |
| Black River At Kingstree | 338 cfs | → |
| Lake Moultrie Tailrace Canal At Moncks Corner | 270 cfs | → |
| Santee River Nr Jamestown | 6,660 cfs | → |
| Back River At Dupont Intake Nr Kittredge | 671 cfs | → |
| Turkey Creek Near Maryville | 0 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Knollwood Dam 2.
Boat launches
- Williamsburg County
- Russel Store Road Berkeley County
- Clarendon County
- State Highway 260 Clarendon County
- Log Jam Road Clarendon County
- Hatchery Boat Ramp Lake Moultrie
Campgrounds
Fishing spots
Track Knollwood Dam 2 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 Knollwood Dam 2
Where does the data for Knollwood Dam 2 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 Knollwood Dam 2.