Twin Lake#1 dam
Twin Lake#1
Twin Lake#1, also known as Sanford Gray Lake Dam 1, is a privately owned earth dam located in Coker Creek, Tennessee. Built in 1962 by the USDA NRCS, this dam serves primarily for recreation purposes and is situated on the Hot Water Branch river. With a hydraulic height of 20.8 feet and a structural height of 25.7 feet, Twin Lake#1 has a NID storage capacity of 36 acre-feet and covers a surface area of 3.7 acres.
Despite not being state regulated, Twin Lake#1 has a significant hazard potential, with a moderate risk assessment rating of 3. Although the dam has not been officially rated for its condition, it undergoes inspections every five years, with the last inspection conducted in January 2018. The dam's spillway is uncontrolled, and it does not have any outlet gates. The surrounding area has a drainage area of 0.16 square miles and a normal storage capacity of 31 acre-feet.
Water resource and climate enthusiasts may find Twin Lake#1 intriguing due to its unique design and purpose, as well as its location in the picturesque Monroe County, Tennessee. The dam's history, construction details, and risk assessment provide valuable insights into the management of water resources and the importance of maintaining infrastructure for recreation and environmental preservation. Twin Lake#1 stands as a reminder of the intricate relationship between human development and natural ecosystems, making it a fascinating subject for further study and appreciation.
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 Twin Lake#1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Tellico River At Tellico Plains | 122 cfs | → |
| Ocoee River At Copperhill | 256 cfs | → |
| Valley River At Tomotla | 110 cfs | → |
| Oostanaula Creek Near Sanford | 32 cfs | → |
| Cheoah River Nr Bearpen Gap Nr Tapoco | 136 cfs | → |
| Hiwassee River At Charleston | 10,400 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Twin Lake#1.
Boat launches
- Towee Creek Launch
- Apalachia Powerhouse Launch
- Powerhouse Road 820-832, Reliance
- Hiwassee Dam Access Road 4692, Murphy
- Ellis Creek Road 155, Reliance
- Micken Branch Cherokee County
Campgrounds
- Hunt's Lodge Motorcycle Campground
- Holly Flats Campground
- Holly Flats
- North River Composite
- Dam Creek
- Dam Creek Walk-In Campground And Picnic Area
Fishing spots
Paddle runs
- Tn/Nc State Line (Rm 48.0) To Tn360 Bridge (Rm 30.0)
- Headwaters Near Graham County Line To Nc/Tn State Line
- Apalachia Powerhouse (Rm 53.5) To Us411 Bridge (Rm 43.0)
- Headwaters Near Mitchell Lick To Owlcamp Branch
- Owlcamp Branch To Polecat Branch
- Polecat Branch To Snowbird Picnic Area
Track Twin Lake#1 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 Twin Lake#1
Where does the data for Twin Lake#1 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 Significant 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 Twin Lake#1.