Gilham's Lake Dam dam
Gilham's Lake Dam
Gilham's Lake Dam, located in Roswell, Georgia, was completed in 1960 and serves as a vital recreational resource in the area. The dam, with a height of 41.4 feet and a length of 170 feet, impounds Willeo Creek to create a surface area of 20.2 acres and a storage capacity of 282 acre-feet. The primary purpose of the dam is recreation, offering opportunities for boating, fishing, and other water-based activities.
Managed by a private owner, Gilham's Lake Dam is regulated by the Georgia Safe Dams Program and undergoes regular inspections to ensure its structural integrity. The dam, classified as an earth dam with a buttress core type, has a high hazard potential but was assessed to be in satisfactory condition during the last inspection in February 2016. Despite its moderate risk assessment rating, the dam has not experienced any significant modifications or emergency events in recent years.
The dam's location within Fulton County, Georgia, and its designation as a controlled spillway structure with uncontrolled outlet gates highlight its importance in managing water resources in the region. With its picturesque setting and recreational offerings, Gilham's Lake Dam stands as a symbol of the intersection between water management, climate resilience, and community enjoyment.
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 Gilham's Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Chattahoochee River Below Morgan Falls Dam | 1,010 cfs | → |
| Sope Creek Near Marietta | 10 cfs | → |
| Chattahoochee River Above Roswell | 615 cfs | → |
| Noonday Creek At Hawkins Store Rd | 6 cfs | → |
| Noonday Creek At Shallowford Road | 13 cfs | → |
| Big Creek Near Alpharetta | 37 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Gilham's Lake Dam.
Boat launches
- Johnson Ferry Road Southeast Sandy Springs
- Riveredge Lane Northwest Sandy Springs
- Lake Windward Landing 139, Alpharetta
- West Palisades Vinings
- Cobb Parkway South Vinings
- Chattahochee River Park Peachtree Corners
Campgrounds
- Dobbins Lakeside Military
- Payne - Allatoona Lake
- Victoria - Allatoona Lake
- Sweetwater - Allatoona Lake
- Clark Creek South - Allatoona Lake
- Clark Creek North - Allatoona Lake
Fishing spots
Track Gilham's 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 Gilham's Lake Dam
Where does the data for Gilham's 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 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 Gilham's Lake Dam.