Simmons dam
Simmons
Simmons, a private dam located in Humphreys, Tennessee, was completed in 1971 and stands at a height of 31 feet with a hydraulic height of 28.6 feet. It holds a maximum storage capacity of 193 acre-feet and covers a surface area of 13.8 acres, with a drainage area of 0.24 square miles. The dam, primarily constructed of earth, spans 650 feet and features an uncontrolled spillway. Despite its significant hazard potential, its condition assessment remains unrated as of the last inspection in January 2016.
The dam on Culvert Branch, under the jurisdiction of the Nashville District, does not have any associated structures or federal agency involvement in its ownership, funding, design, construction, regulation, inspection, or operation. It is not regulated by the state and does not require permitting or enforcement. The risk assessment for Simmons is moderate, with a rating of 3, and it currently does not have an Emergency Action Plan (EAP) in place or meet the guidelines for one. With its historical significance and potential impacts on water resources in the area, Simmons serves as an important structure for water resource and climate enthusiasts to monitor and study.
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 Simmons -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Piney River At Vernon | 81 cfs | → |
| Duck River Above Hurricane Mills | 765 cfs | → |
| Yellow Creek At Ellis Mills | 68 cfs | → |
| Duck River At Hwy 100 At Centerville | 555 cfs | → |
| Buffalo River Below Lobelville | 450 cfs | → |
| Harpeth River Near Kingston Springs | 49 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Simmons.
Boat launches
- Willie Shanes Road 115, Hickman County
- Gaynor Slough Boat Ramp
- Humphreys County
- Cheatham County
- New Johnsonville Boat Ramp
- Eva Beach Drive 248, Eva
Campgrounds
- Montgomery Bell State Park
- Woodland Shelter
- Wildcat Shelter
- Camp Isengard
- Nathan Bedford Forrest State Park
- Harpeth River Bridge
Track Simmons 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 Simmons
Where does the data for Simmons 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 Simmons.