Unnamed Dam dam
Unnamed Dam
Unnamed Dam, also known as Cla01, is a privately owned structure located in Green Cove Springs, Florida. The dam is regulated by the Florida Department of Environmental Protection and serves the primary purpose of flood risk reduction. It also supports recreation and water supply in the area. Built as an Earth type dam with a height of 13 feet and a hydraulic height of 10 feet, it has a storage capacity of 218 acre-feet and covers a surface area of 19 acres.
Situated on the Mill Log Creek, the dam has a drainage area of 3.81 square miles and is equipped with uncontrolled outlet gates. Despite its low hazard potential and a condition assessment that is yet to be rated, the dam has a normal storage capacity of 32 acre-feet. With a length of 690 feet, the dam offers vital flood protection to the surrounding area. The last inspection was conducted in May 2017, emphasizing the importance of regular maintenance and monitoring to ensure the safety and functionality of this essential water resource infrastructure for the local community.
For water resource and climate enthusiasts, Unnamed Dam presents an intriguing case study in dam management and regulation. While serving as a critical tool for flood risk reduction, the dam also contributes to recreational activities and water supply in the region. Its location, design, and capacity highlight the intricate balance between human development and environmental sustainability. As the dam continues to play a crucial role in water management in Clay County, Florida, ongoing inspections and maintenance efforts are essential to ensure its continued effectiveness and safety for the community.
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 Unnamed Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Fork Black Creek Nr Penney Farms | 19 cfs | → |
| Ortega River At Kirwin Rd Nr Jacksonville | 7 cfs | → |
| North Fork Black Creek Nr Middleburg | 10 cfs | → |
| Julington Crk At Old St August Rd Nr Bayard | 101 cfs | → |
| Cedar River At San Juan Ave At Jacksonville | 183 cfs | → |
| Pottsburg Creek Nr South Jacksonville | 72 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Unnamed Dam.
Boat launches
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Campgrounds
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Fishing spots
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River runs
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About Unnamed Dam
Where does the data for Unnamed Dam 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 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.