Upper Mulberry River Ws Str. # 7 dam
Upper Mulberry River Ws Str. # 7
Upper Mulberry River WS Str. # 7, also known as Duncan Lake Dam, is a significant structure located in Gwinnett, Georgia. Owned by the local government and regulated by the GA-SAFE DAMS PROGRAM, this earth dam stands at a height of 44.4 feet and was completed in 1980 for the primary purpose of flood risk reduction along Duncan Creek.
With a storage capacity of 1796 acre-feet, this dam has a high hazard potential and is subject to regular inspections, with the last assessment in March 2017 deeming its condition satisfactory. The dam features uncontrolled spillways and outlet gates, emphasizing its crucial role in managing floodwaters and protecting the surrounding area from potential inundation. Despite its moderate risk rating, the dam continues to serve as a key infrastructure for water resource management in the region.
As part of the larger network of dams and structures in the area, Upper Mulberry River WS Str. # 7 plays a vital role in mitigating flood risks and ensuring the safety of downstream communities. With its strategic location and design by NRCS, this dam stands as a testament to effective water resource management and climate resilience efforts in Georgia. As climate change continues to impact water resources, structures like Duncan Lake Dam will play an increasingly important role in safeguarding communities and ecosystems from the threats of extreme weather events.
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 Upper Mulberry River Ws Str. # 7 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Wheeler Creek At Bill Cheek Road | 1 cfs | → |
| Apalachee River At Fence Road | 1 cfs | → |
| Alcovy River Near Lawrenceville | 8 cfs | → |
| Richland Creek At Suwanee Dam Road | 6 cfs | → |
| Level Creek At Suwanee Dam Road | 3 cfs | → |
| Alcovy River At New Hope Road | 18 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Upper Mulberry River Ws Str. # 7.
Boat launches
- Van Pugh North Park
- Kings Point Drive Forsyth County
- Browns Bridge Road Forsyth County
- Saint Ives Country Club Parkway Johns Creek
- Chattahochee River Park Peachtree Corners
- Lake Windward Landing 139, Alpharetta
Campgrounds
- James Shackleford County Park
- Chestnut Ridge - Lake Lanier
- Shoal Creek - Lake Lanier
- Old Federal - Lake Lanier
- Fort Yargo State Park
- Shady Grove - Lake Lanier
Fishing spots
Paddle runs
- Martin Branch Bridge To Robertsontown Bridge On Ga Highway 356
- Old Turnpike Crossing To Martin Branch Bridge
- Mark Trail Wilderness Boundry To Old Turnpike Crossing Near Vandiver Branch
- Source Near Chattahoochee Gap To Mark Trail Wilderness Boundary
- Confluence Of Brasstown Creek And Little Brasstown Creek Just South Of Brasstown Falls Road (Fs 751) To Confluence Of Mill Branch, Brasstown Creek And Boatwright Creek Near Boatwright Road (Fs 753)
- Lloyd Shoals Dam On Lake Jackson To Georgia State Highway 16
Track Upper Mulberry River Ws Str. # 7 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 Upper Mulberry River Ws Str. # 7
Where does the data for Upper Mulberry River Ws Str. # 7 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 High 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 Upper Mulberry River Ws Str. # 7.