Twin Springs dam
Twin Springs
Twin Springs is a private dam located in McNairy, Tennessee, along the Joplin Branch river. Built in 1977, this earth dam stands at a structural height of 33.4 feet and has a hydraulic height of 29 feet. With a storage capacity of 272 acre-feet, it serves the primary purpose of water resource management in the area. The dam is regulated, permitted, inspected, and enforced by the Tennessee Safe Dams Program, ensuring its safety and compliance with state regulations.
Despite its satisfactory condition assessment in 2019, Twin Springs poses a significant hazard potential due to its location and design. However, the risk assessment for this dam is moderate, indicating a level 3 risk based on current evaluations. The emergency action plan status and risk management measures for Twin Springs are not specified in the available data, raising questions about the preparedness and response protocols in case of a potential dam failure. As water resource and climate enthusiasts, monitoring and advocating for the safety and maintenance of dams like Twin Springs is crucial to protect communities and ecosystems downstream.
As part of the Nashville District, Twin Springs is overseen by the Tennessee Safe Dams Program and falls under the jurisdiction of the state regulatory agency. While the dam has a spillway type of "Uncontrolled" and no associated locks or outlet gates, its last inspection in November 2019 indicated a satisfactory condition. With a drainage area of 0.51 square miles and a surface area of 19 acres, Twin Springs plays a vital role in water management and flood control in the region. As advocates for sustainable water resource management, it is essential to stay informed about the maintenance and monitoring of dams like Twin Springs to ensure their continued safety and functionality.
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 Springs -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Horse Creek Near Savannah | 54 cfs | → |
| Hatchie River Near Walnut | 86 cfs | → |
| Hatchie River At Bolivar | 1,460 cfs | → |
| Wolf River At Lagrange | 180 cfs | → |
| Middle Fork Forked Deer River Near Fairview | 215 cfs | → |
| Bear Creek At Bishop | 4,330 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Twin Springs.
Boat launches
- Highway 57 23970-23972, Pocahontas
- Wharf Road, Savannah
- Tennessee River Lane 475, Savannah
- White Oak Wildlife Road, Sardis
- Branun Cemetery Road, Savannah
- Main Street 499, Saltillo
Campgrounds
- Big Hill Pond State Park Campground
- Big Hill Pond Sp - Grassy Point Shelter
- Pickwick Dam - Tva
- Chickasaw State Park - Tent
- Pickwick Landing Sp - Trail Camps
Paddle runs
Track Twin Springs 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 Springs
Where does the data for Twin Springs 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 Springs.