Cumberland Mtn Lake#3 dam
Cumberland Mtn Lake#3
Cumberland Mtn Lake#3, located in BOST COVE, Grundy, Tennessee, is a privately owned earth dam constructed in 1972 on Mill Creek. With a hydraulic height of 22.2 feet and a structural height of 24.5 feet, this dam stands at a total height of 25 feet and spans 925 feet in length. It has a maximum storage capacity of 384 acre-feet and a normal storage capacity of 302 acre-feet, covering a surface area of 34 acres with a drainage area of 0.39 square miles.
Despite being categorized with a low hazard potential, Cumberland Mtn Lake#3 is rated as moderate in terms of risk assessment. The dam has not been inspected since December 2016, with a scheduled inspection frequency of 5 years. While the condition assessment remains unrated, there is no Emergency Action Plan (EAP) in place, and the dam does not meet regulatory guidelines for inundation maps or emergency contacts. Although there are no associated structures or locks, the dam does have an uncontrolled spillway and outlet gates.
Overall, Cumberland Mtn Lake#3 serves as a significant water resource in Grundy, Tennessee, providing storage for the surrounding area. Climate and water resource enthusiasts may be interested in the engineering and maintenance challenges associated with this privately owned dam, as well as the risk management measures in place to ensure public safety in the event of any emergencies.
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 Cumberland Mtn Lake#3 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Bradley Creek Nr Prairie Plains | 33 cfs | → |
| Elk River Near Pelham | 31 cfs | → |
| Duck River Below Manchester | 41 cfs | → |
| Collins River Near Mcminnville | 198 cfs | → |
| Sequatchie River Near Whitwell | 152 cfs | → |
| Wartrace Creek Below County Road At Wartrace | 2 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Cumberland Mtn Lake#3.
Boat launches
- Prairie Plains Road 6471, Hillsboro
- Manchester Beach Road, Tullahoma
- Morris Ferry Dock Road 66-98, Estill Springs
- Franklin County Park Boat Ramp
- Eastbrook Road 1740, Estill Springs
- River Forge Road 485, Manchester
Campgrounds
Fishing spots
Track Cumberland Mtn Lake#3 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 Cumberland Mtn Lake#3
Where does the data for Cumberland Mtn Lake#3 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 Cumberland Mtn Lake#3.