G111 Control Structure dam
G111 Control Structure
The G111 Control Structure, also known as the Lake Jackson Structure, is a state-owned flood control system located in Osceola, Florida. Managed by the South Florida Water Management District (SFWMD) and the Florida Department of Environmental Protection, this structure plays a crucial role in reducing flood risks in the area. Completed in 1994, the G111 Control Structure is an earth dam with a height of 14 feet and a hydraulic height of 12 feet, offering flood protection for the surrounding communities.
With a maximum storage capacity of 11,000 acre-feet and a normal storage capacity of 7,500 acre-feet, the G111 Control Structure covers a surface area of 830 acres and serves a drainage area of 21 square miles. Equipped with a controlled spillway and other controlled outlet gates, this structure can handle a maximum discharge of 300 cubic feet per second. Despite its low hazard potential, the G111 Control Structure is deemed to be at a very high risk, indicating the importance of ongoing risk management and monitoring efforts to ensure its effectiveness in mitigating flood risks and protecting the local environment.
As an essential component of the water resource management infrastructure in Florida, the G111 Control Structure stands as a testament to the state's commitment to flood risk reduction and environmental protection. With its strategic location along the Jackson Canal and its vital role in regulating water levels in Lake Jackson, this structure exemplifies the collaborative efforts of state agencies and stakeholders in safeguarding communities against the impacts of extreme weather events and climate change.
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 G111 Control Structure -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Tiger Creek Near Babson Park Fl | 20 cfs | → |
| Livingston Creek Near Frostproof Fl | 15 cfs | → |
| Jane Green Creek Near Deer Park | 0 cfs | → |
| Blue Cypress Creek Nr Fellsmere | 29 cfs | → |
| Pennywash Creek Nr Deer Park | 2 cfs | → |
| Wolf Creek Near Deer Park | 1 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near G111 Control Structure.
Boat launches
- Florida 60 26000, Lake Wales
- 799 Lakeside Blvd, Kenansville, Fl 34739
- Park Drive Polk County
- 3301 Lake Cypress Rd, Kenansville, Fl 34739
- Boat Landing Road, Lake Wales
- Lake Gentry Road 5424, Saint Cloud
Campgrounds
- Three Lakes Campsite
- River Ranch Property Owners Association
- Buster Island Primitive Camp Site
- Fallen Oak Campsite
- Lake Kissimmee State Park
- Town Of Kicco Campsite
Fishing spots
Track G111 Control Structure 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 G111 Control Structure
Where does the data for G111 Control Structure 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 G111 Control Structure.