Brook Hollow Lake Dam dam
Brook Hollow Lake Dam
Brook Hollow Lake Dam, located in Gwinnett, Georgia, was completed in 1985 with a primary purpose of flood risk reduction. This private dam, designed by Pharr Engineering, is an earth dam with a buttress core type, standing at 34 feet in height with a hydraulic height of 25 feet. The dam has a storage capacity of 63 acre-feet and a normal storage of 24 acre-feet, serving a drainage area of 89 square miles.
Despite being state-regulated and inspected, the dam is classified with a low hazard potential and a moderate risk assessment. With an uncontrolled spillway and outlet gates, the dam's condition remains unrated as of the last inspection in October 2016. Even though the dam meets guidelines and has not experienced any emergency situations, water resource and climate enthusiasts may find interest in the risk management measures and potential enhancements that could further ensure the safety and efficiency of Brook Hollow Lake Dam for the surrounding community and environment.
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 Brook Hollow Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| N.F. Peachtree Creek At Graves Rd | 0 cfs | → |
| Crooked Creek Near Norcross | 2 cfs | → |
| Chattahoochee River Near Norcross | 1,070 cfs | → |
| Chattahoochee River Above Roswell | 1,370 cfs | → |
| Big Creek Near Alpharetta | 34 cfs | → |
| Suwanee Creek At Suwanee | 18 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Brook Hollow Lake Dam.
Boat launches
- Chattahochee River Park Peachtree Corners
- Saint Ives Country Club Parkway Johns Creek
- Lake Windward Landing 139, Alpharetta
- Johnson Ferry Road Southeast Sandy Springs
- Riveredge Lane Northwest Sandy Springs
- West Palisades Vinings
Campgrounds
- Stone Mountain Park Campground
- Stone Mountain Campground
- Dobbins Lakeside Military
- Sawnee
- Shoal Creek - Lake Lanier
- Bald Ridge Creek
Fishing spots
Track Brook Hollow 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 Brook Hollow Lake Dam
Where does the data for Brook Hollow 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 Brook Hollow Lake Dam.