Johnson Lake Dam dam
Johnson Lake Dam
Johnson Lake Dam, located in Bacon, Georgia, is a privately owned earth dam built in 1947 with a primary purpose of recreation. Standing at a height of 13 feet and stretching 810 feet in length, the dam creates a reservoir with a normal storage capacity of 139 acre-feet and a maximum storage of 640 acre-feet. The dam overlooks the scenic Tenmile Creek and covers a surface area of 37 acres, providing a serene environment for water resource and climate enthusiasts to explore.
Despite being classified as having a low hazard potential, the dam has a moderate risk assessment rating. It has not been inspected since July 2016, with an inspection frequency of 5 years. While the condition assessment is marked as "Not Rated," there are no emergency action plans prepared or updated for the dam. With its uncontrolled spillway and outlet gates, Johnson Lake Dam presents an intriguing case study for those interested in understanding the management and risks associated with earthen dams in recreational settings.
Overall, Johnson Lake Dam offers a unique blend of recreational opportunities and potential risks for water resource and climate enthusiasts. Its historical significance, coupled with its location in the picturesque St James Church environs, makes it a fascinating subject for further exploration and study in the realm of dam safety and management in Georgia.
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 Johnson Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Satilla River Near Waycross | 57 cfs | → |
| Little Satilla River Near Offerman | 0 cfs | → |
| Altamaha River Near Baxley | 4,410 cfs | → |
| Ocmulgee River At Lumber City | 2,670 cfs | → |
| Altamaha River At Doctortown | 5,370 cfs | → |
| Satilla River At Atkinson | 86 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Johnson Lake Dam.
Boat launches
- Getaway Lane, Surrency
- Landing Road 438, Baxley
- Deen's Landing Road 688-700, Baxley
- Arnold River Road 599, Jesup
- ⛉ Riverwood Trail 45, Uvalda
Campgrounds
Fishing spots
Track Johnson 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 Johnson Lake Dam
Where does the data for Johnson 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 Johnson Lake Dam.