Thompson Lake Dam dam
Thompson Lake Dam
Thompson Lake Dam, located in Cobb, Georgia, was completed in 1950 and serves as a vital recreational resource for the Marietta Community. Owned privately and standing at a height of 24.6 feet with a length of 460 feet, this earth dam holds a maximum storage capacity of 114.4 acre-feet and covers a surface area of 9 acres. Despite being unregulated by the state, the dam poses a low hazard potential and has not been officially rated for its condition assessment.
The dam's primary purpose is for recreation, providing opportunities for fishing, boating, and other outdoor activities. It is designed as an earth dam with a buttress core type, utilizing uncontrolled spillways and outlet gates. While the dam has not undergone recent inspections or been assessed for its condition, it maintains a moderate risk level and is situated in a drainage area of 213 square miles. With its scenic location and historical significance, Thompson Lake Dam continues to be a cherished landmark for water resource and climate enthusiasts in the area.
As an integral part of the community, Thompson Lake Dam offers a serene setting for outdoor enthusiasts to enjoy nature and engage in various recreational activities. While its risk level is categorized as moderate, ongoing maintenance and periodic inspections ensure the safety and functionality of this important water resource. With its rich history and scenic beauty, Thompson Lake Dam remains a valuable asset for residents and visitors alike, highlighting the intersection of water management, climate awareness, and recreational opportunities in Cobb, 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 Thompson Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Sope Creek Near Marietta | 10 cfs | → |
| Chattahoochee River Below Morgan Falls Dam | 1,010 cfs | → |
| Chattahoochee River Above Roswell | 615 cfs | → |
| Noonday Creek At Hawkins Store Rd | 6 cfs | → |
| Noonday Creek At Shallowford Road | 13 cfs | → |
| Nancy Creek At Rickenbacker Drive | 7 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Thompson Lake Dam.
Boat launches
- Johnson Ferry Road Southeast Sandy Springs
- Riveredge Lane Northwest Sandy Springs
- West Palisades Vinings
- Cobb Parkway South Vinings
- Lake Windward Landing 139, Alpharetta
- Chattahochee River Park Peachtree Corners
Campgrounds
- Dobbins Lakeside Military
- Payne - Allatoona Lake
- Victoria - Allatoona Lake
- Clark Creek South - Allatoona Lake
- Clark Creek North - Allatoona Lake
- Sweetwater - Allatoona Lake
Fishing spots
Track Thompson 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 Thompson Lake Dam
Where does the data for Thompson 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 Thompson Lake Dam.