Hil21 dam
Hil21
Located in Plant City, Florida, the Hil21 dam stands at a height of 50.89 feet and serves the primary purpose of tailings management. Built on an unnamed pond, this private-owned earth dam has a storage capacity of 29,947.39 acre-feet and covers a surface area of 497 acres. Although its hazard potential is currently undetermined and its condition is not rated, the dam is regulated by the Florida Department of Environmental Protection, with state permitting, inspection, and enforcement in place.
Despite lacking certain details such as the year of completion and inspection frequency, the Hil21 dam remains a significant infrastructure in Hillsborough County, Florida. With a normal storage capacity of 4,673.38 acre-feet, the dam plays a crucial role in managing water resources in the area. The dam's location in a strategic position in the watershed ensures effective control over water flow and storage, contributing to the overall water management efforts in the region.
As water resource and climate enthusiasts continue to monitor and assess the impact of dams like Hil21 on the environment, it is important to stay updated on the regulatory measures in place and the potential risks associated with such structures. With a focus on safety and sustainable water management practices, ongoing evaluation of dam conditions, emergency preparedness, and risk assessment are crucial to ensuring the resilience of water infrastructure in the face of changing climate patterns and increasing water demands.
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 Hil21 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Little Manatee River Near Ft. Lonesome Fl | · | → |
| South Prong Alafia River Near Ft Lonesome Fl | 7 cfs | → |
| South Prong Alafia River Near Lithia Fl | 12 cfs | → |
| South Fork Little Manatee River Near Parrish Fl | 1 cfs | → |
| South Fork Little Manatee River Near Wimauma Fl | 4 cfs | → |
| Alafia River At Lithia Fl | 26 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hil21.
Boat launches
- Alderman's Ford Park Trail Hillsborough County
- Alligator Alley, Plant City
- Center Avenue 852, Brandon
- Bullfrog Creek Bait
- Commongood Park
- Williams Park
Campgrounds
- Alafia River State Park
- Alderman's Ford Park Campsite 1
- Alderman's Ford Park Campsite 4
- Alderman's Ford Park Campsite 2
- Alderman's Ford Park Campsite 3
- Lithia Springs
Fishing spots
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 Hil21 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 Hil21
Where does the data for Hil21 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 Undetermined 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 Hil21.