South Holston Dam - Bent Branch Auxiliary Spillway dam
South Holston Dam - Bent Branch Auxiliary Spillway
South Holston Dam - Bent Branch Auxiliary Spillway is a vital structure located in Bluff City, Tennessee, along the South Fork Holston River. Built in 1950 by the Tennessee Valley Authority, this concrete dam with a multi-arch core serves the primary purpose of flood risk reduction. With a structural height of 9 feet and a length of 300 feet, the dam plays a crucial role in managing water levels and protecting the surrounding areas from potential flooding.
The Bent Branch Auxiliary Spillway features an uncontrolled spillway type with a width of 300 feet, allowing for a maximum discharge of 43,200 cubic feet per second. While it has a high hazard potential, the risk assessment for this structure is moderate. The dam is not state-regulated and is solely owned, funded, designed, constructed, regulated, inspected, and operated by the Tennessee Valley Authority, highlighting the agency's comprehensive involvement in its management and maintenance.
Despite limited data on storage capacity and condition assessment, the South Holston Dam - Bent Branch Auxiliary Spillway continues to play a crucial role in safeguarding the local community and environment from potential flood risks. With regular inspections and emergency action planning in place, this structure stands as a testament to effective water resource management and climate resilience efforts in the region.
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 South Holston Dam - Bent Branch Auxiliary Spillway -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Beaver Creek At Bristol | 24 cfs | → |
| Watauga River At Elizabethton | 460 cfs | → |
| Doe River At Elizabethton | 293 cfs | → |
| S F Holston River Near Damascus | 218 cfs | → |
| M F Holston River Near Meadowview | 357 cfs | → |
| Watauga River Near Sugar Grove | 56 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near South Holston Dam - Bent Branch Auxiliary Spillway.
Boat launches
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Campgrounds
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Fishing spots
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River runs
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More reservoirs
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About South Holston Dam - Bent Branch Auxiliary Spillway
Where does the data for South Holston Dam - Bent Branch Auxiliary Spillway 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.