Stj04 dam
Stj04
Stj04, located in Ponte Vedra Beach, Florida, is a vital water resource structure along the Intercoastal Waterway. Owned by the local government, this dam is regulated by the state and serves a primary purpose classified as 'Other'. With a dam height of 21 feet and a storage capacity of 4806 acre-feet, Stj04 plays a significant role in managing water levels in the area.
Constructed with an earth core and stone foundations, Stj04 has a spillway width of 60 feet and a hazard potential rated as 'High'. Despite not having a condition assessment rating, it is considered to have a moderate risk level of 3. The structure's emergency action plan status and risk management measures are not disclosed in the available data, highlighting areas that may require further attention and evaluation to ensure the safety and functionality of Stj04 for water resource and climate enthusiasts to monitor and assess.
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 Stj04 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Julington Crk At Old St August Rd Nr Bayard | 169 cfs | → |
| Pottsburg Creek Nr South Jacksonville | 25 cfs | → |
| St. Johns River At Jacksonville | 161,000 cfs | → |
| Ortega River At Kirwin Rd Nr Jacksonville | 5 cfs | → |
| Cedar River At San Juan Ave At Jacksonville | 27 cfs | → |
| Deep Creek At Spuds | 214 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Stj04.
Boat launches
- West Palm Vally Landing
- Six Mile Landing
- Hood Landing Road 12903, Jacksonville
- Usina Boat Ramp
- Longview Drive South 14688, Jacksonville
- Palmo Fish Camp Road 8698, Saint Augustine
Campgrounds
- Osprey Cove Military - Mayport Ns
- Hanna City Park
- Anastasia State Park
- Jacksonville Nas Rv Military
- Pelican Roost Rv Military - Mayport Ns
- Huguenot City Park
Fishing spots
Paddle runs
- The Confluence Of The North Prong And Middle Prong To Trader's Hill
- Begins Approximately 1 Mile Upstream Of Flea Hill, Georgia To The Bells River Confluence
More reservoirs
Track Stj04 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 Stj04
Where does the data for Stj04 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 High 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 Stj04.