G103 Control Structure dam
G103 Control Structure
The G103 Control Structure, also known as the Lake Rosalie Control Structure, is a critical flood risk reduction infrastructure located in Polk, Florida. Managed by the South Florida Water Management District (SFWMD), this state-regulated structure plays a vital role in managing water levels in the Zipperer Canal to prevent flooding and protect surrounding areas. With a dam height of 15 feet and a hydraulic height of 9 feet, the G103 Control Structure has a structural height of 24 feet and was completed in 1965.
Covering a drainage area of 42 square miles, the G103 Control Structure has a maximum storage capacity of 49,000 acre-feet and a normal storage level of 35,100 acre-feet, serving a surface area of 5,400 acres. Equipped with a controlled spillway with a width of 50 feet, this structure has a maximum discharge capacity of 734 cubic feet per second. Despite its low hazard potential, the risk assessment for the G103 Control Structure indicates a very high risk level, emphasizing the importance of its maintenance and monitoring for optimal performance in mitigating flood risks in the region.
The G103 Control Structure stands as a testament to Florida's commitment to water resource management and climate resilience. With its roller-compacted concrete core type and soil foundation, this structure exemplifies the state's efforts to prioritize flood risk reduction and ensure the safety of its residents. As climate change continues to impact water resources, the G103 Control Structure remains a crucial asset in safeguarding the surrounding communities and enhancing the overall resilience of the region against potential flooding 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 G103 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 | → |
| Peace Creek Drainage Canal Near Wahneta Fl | 5 cfs | → |
| Shingle Creek At Campbell | 46 cfs | → |
| Reedy Creek Nr Loughman | · | → |
| Shingle Creek At Airport Nr Kissimmee | 30 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near G103 Control Structure.
Boat launches
- Park Drive Polk County
- Boat Landing Road, Lake Wales
- 3301 Lake Cypress Rd, Kenansville, Fl 34739
- North Lakeshore Boulevard 769, Lake Wales
- East Southport Road 2001, Kissimmee
- Florida 60 26000, Lake Wales
Campgrounds
- Fallen Oak Campsite
- Buster Island Primitive Camp Site
- Lake Kissimmee State Park
- Backpack Campsite
- River Ranch Property Owners Association
- Circle F Dude Ranch Camp - Summer Camp & Outdoor Education Center
Fishing spots
Track G103 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 G103 Control Structure
Where does the data for G103 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 G103 Control Structure.