Mann Lake Dam dam
Mann Lake Dam
Mann Lake Dam, located in Toombs, Georgia, is a private earth dam designed by George Rice of the NRCS. Standing at a height of 21 feet, the dam has a storage capacity of 270 acre-feet and serves as a water resource for the surrounding area. The dam is considered to have a low hazard potential and a moderate risk assessment rating.
Although not regulated by the state, Mann Lake Dam undergoes regular inspections, with the last one conducted in May 2017. The dam features an uncontrolled spillway and outlet gates, with no associated structures. While the condition of the dam is currently not rated, it meets the guidelines for emergency action preparedness.
For water resource and climate enthusiasts, Mann Lake Dam offers a glimpse into the engineering and management of water infrastructure in Georgia. Its modest size and simple design provide an interesting case study for those interested in the intersection of water resources, dam safety, and risk management. With a focus on efficient water storage and minimal environmental impact, Mann Lake Dam stands as a testament to the importance of sustainable water management practices in the face of a changing climate.
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 Mann Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Altamaha River Near Baxley | 3,400 cfs | → |
| Ohoopee River Near Reidsville | 43 cfs | → |
| Ocmulgee River At Lumber City | 2,120 cfs | → |
| Oconee River Near Mount Vernon | 933 cfs | → |
| Turnpike Creek Near Mcrae | · | → |
| Canoochee River Near Claxton | 2 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mann Lake Dam.
Boat launches
- Benton Powell Road 267-315, Uvalda
- Deen's Landing Road 688-700, Baxley
- ⛉ Riverwood Trail 45, Uvalda
- Highway 135, Uvalda
- Cherokee Road Wheeler County
- Landing Road 438, Baxley
Campgrounds
- Falling Rocks County Park
- Towns Bluff County Park
- Gordonia-Alatamaha State Park
- Little Ocmulgee State Park
Fishing spots
Track Mann Lake Dam 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 Mann Lake Dam
Where does the data for Mann Lake Dam 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 Mann Lake Dam.