Mosaic Csa F4a dam
Mosaic Csa F4a
Mosaic Csa F4a is a privately owned Earth dam located in Fort Lonesome, Hillsborough County, Florida. Built in 2003, this dam serves the primary purpose of storing tailings from mining activities. With a hydraulic height of 55 feet and a structural height of 62 feet, it stands at an impressive 60 feet tall and stretches over 21,180 feet in length. The dam has a maximum storage capacity of 37,500 acre-feet and covers a surface area of 650 acres, with a drainage area of 1.02 square miles.
The dam's spillway, which is controlled, has a width of 128 feet to manage discharge during peak flow events. Mosaic Csa F4a has been deemed to have a significant hazard potential, with a very high risk assessment rating of 1. Although the condition assessment is listed as "Not Rated," the dam is subject to state regulation, permitting, inspection, and enforcement by the Florida Department of Environmental Protection. Despite not being federally owned, the dam operates under state jurisdiction and follows state guidelines for emergency action plans and risk management measures.
For water resource and climate enthusiasts, Mosaic Csa F4a represents a critical infrastructure in managing water resources in the region. With its large storage capacity and controlled spillway, the dam plays a crucial role in safeguarding against potential flooding events and ensuring the safe storage of tailings. As a privately owned structure with state oversight, Mosaic Csa F4a highlights the intersection of private and public interests in ensuring the safety and sustainability of water management systems in the face of evolving climate conditions.
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 Mosaic Csa F4a -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Little Manatee River Near Ft. Lonesome Fl | · | → |
| South Fork Little Manatee River Near Parrish Fl | 1 cfs | → |
| South Prong Alafia River Near Ft Lonesome Fl | 7 cfs | → |
| South Fork Little Manatee River Near Wimauma Fl | 4 cfs | → |
| South Prong Alafia River Near Lithia Fl | 12 cfs | → |
| Little Manatee River Near Wimauma Fl | 11 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mosaic Csa F4a.
Boat launches
- Alderman's Ford Park Trail Hillsborough County
- Manatee County
- Wildcat Creek
- Commongood Park
- Center Avenue 852, Brandon
- Domino Park Boat Ramp
Campgrounds
- Alafia River State Park
- Primative Camp Site
- Alderman's Ford Park Campsite 1
- Alderman's Ford Park Campsite 4
- Alderman's Ford Park Campsite 2
- Little Manatee River State Park
Fishing spots
- Carlton Lake
- Lake Manatee
- Edward Medard Reservoir
- Peace River
- Ward Lake (Bill Evers Reservoir)
- Upper Myakka Lake
Paddle runs
- County Road 780 Bridge To State Road 72 Bridge
- Begins Downstream Of The State Road 72 Bridge To The Southern Boundary Of Myakka River State Park
- The Southern Boundary Of The Myakka River State Park To Ends Approximately At River Mile 23 Where Riverfront Residential Development Begins
- Approximately At River Mile 23 Where Riverfront Residential Development Begins To The Vicinity Of Snook Haven Fish Camp At Approximately River Mile 18
- Approximately River Mile 18 To A Point Just Upriver Of The Us 41 Highway Crossing
- A Point Just Upriver Of The Us 41 Highway Crossing To The Sarasota/Charlotte County Line
Track Mosaic Csa F4a 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 Mosaic Csa F4a
Where does the data for Mosaic Csa F4a 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 Significant 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 Mosaic Csa F4a.