F1 Four Corners Mine Dam
F1 Four Corners Mine
The F1 Four Corners Mine in Florida is a privately owned mine with a primary purpose of tailings storage. The mine features an earth dam with a height of 55 feet and a hydraulic height of 50 feet, completed in 1989. It is located in Manatee County, near the Myakka River, and is regulated by the Florida Department of Environmental Protection (FDEP).
With a storage capacity of 17,500 acre-feet and a surface area of 322 acres, the F1 Four Corners Mine poses a significant hazard potential and is classified as having a very high risk level. Despite not being rated for its condition, the mine is equipped with a controlled spillway and has a maximum discharge capacity of 80 cubic feet per second. The last inspection was conducted in January 2006, and the mine is subject to state regulatory oversight, inspection, and enforcement.
Water resource and climate enthusiasts interested in the intersection of mining operations and environmental regulations in Florida would find the F1 Four Corners Mine to be a captivating case study. Its location near the Myakka River and its significant hazard potential underscore the importance of proper management and oversight of such facilities to protect water resources and mitigate climate-related risks in the region.
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 F1 Four Corners Mine -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Fork Little Manatee River Near Parrish Fl | 10 cfs | → |
| South Prong Alafia River Near Ft Lonesome Fl | 15 cfs | → |
| Little Manatee River Near Ft. Lonesome Fl | 2 cfs | → |
| South Fork Little Manatee River Near Wimauma Fl | 71 cfs | → |
| South Prong Alafia River Near Lithia Fl | 19 cfs | → |
| Horse Creek Near Myakka Head Fl | 4 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near F1 Four Corners Mine.
Boat launches
See all →
Campgrounds
See all →
Fishing spots
See all →
River runs
See all →
More reservoirs
See all →
About F1 Four Corners Mine
Where does the data for F1 Four Corners Mine 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 below 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.
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.