Wylie dam
Wylie
Wylie, located in Fort Mill, South Carolina, is a hydroelectric dam operated by the Catawba River. Built in 1925 by the Wateree Power Company, this gravity dam stands at a height of 119 feet and spans 3,232 feet in length. With a storage capacity of 246,435 acre-feet and a surface area of 12,177 acres, Wylie serves multiple purposes including hydroelectric power generation, recreation, and water supply for the region.
Managed by the Federal Energy Regulatory Commission, Wylie poses a high hazard potential and is classified as very high risk due to its critical infrastructure and location. The dam features controlled spillways and 11 slide gates for water release. While the condition assessment is not available, regular inspections and emergency action plans are in place to ensure the safety and integrity of the structure. With a maximum discharge of 386,364 cubic feet per second, Wylie plays a crucial role in managing water resources and supporting the surrounding communities.
As a key component of the water management system in South Carolina, Wylie remains a vital asset for the region's water supply, energy generation, and recreational activities. With its historic significance and ongoing regulatory oversight, Wylie continues to be a focal point for water resource and climate enthusiasts interested in sustainable infrastructure 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 Wylie -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Catawba River Near Rockhill | 853 cfs | → |
| Steele Creek At Sr1441 Nr Pineville | 1 cfs | → |
| Sugar Creek At Nc 51 Near Pineville | 39 cfs | → |
| Little Sugar Creek At Pineville | 20 cfs | → |
| Mcalpine Cr Below Mcmullen Cr Nr Pineville | 7 cfs | → |
| Wildcat Creek Below Rock Hill | 3 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Wylie .
Boat launches
- New Gray Rock Road Tega Cay
- Windward Drive Tega Cay
- Boatshore Road York County
- Piedmont Medical Center Trail York County
- Waterford Trail Rock Hill
- Soldier Road 15299, Mecklenburg County
Campgrounds
- Ebenezer County Park
- Sign Language
- Mcdowell Nature Preserve
- Andrew Jackson State Park
- Kings Mountain State Park
- Cane Creek Park
Track Wylie 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 Wylie
Where does the data for Wylie 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 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 Wylie .