Irwin Mill Dam dam
Irwin Mill Dam
Irwin Mill Dam, located in Jackson, Florida, along the Irwin Mill Creek, is a privately-owned earth dam completed in 1970 with a primary purpose designated as "Other." The dam stands at a height of 10 feet and has a structural height of 6 feet, with a length of 250 feet. It has a storage capacity of 66 acre-feet and a normal storage level of 40 acre-feet, serving a low hazard potential according to assessments.
While the dam is regulated by the state of Florida and undergoes regular inspections, it has not been rated for its current condition. The last inspection was conducted in May 1994, indicating a need for updated assessments and potential risk management measures. With a maximum discharge rate of 234 cubic feet per second, the dam plays a crucial role in water resource management in the area, highlighting the importance of continued monitoring and maintenance to ensure its safety and functionality for the community.
For water resource and climate enthusiasts, Irwin Mill Dam presents an intriguing case study of a privately-owned structure with significant implications for local water management. As a part of the broader network of dams in the region, understanding its design, purpose, and regulatory oversight is essential for assessing its impact on the surrounding environment and communities. With a focus on safety and sustainability, ongoing evaluations and potential risk mitigation strategies can help ensure the continued effectiveness of the dam in meeting its intended purposes while minimizing potential hazards.
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 Irwin Mill Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Sawhatchee Creek At Cedar Springs | 44 cfs | → |
| Spring Creek Near Iron City | 148 cfs | → |
| Spring Creek Near Reynoldsville | 180 cfs | → |
| Chipola River At Marianna Fl | 973 cfs | → |
| Apalachicola River At Chattahoochee Fla | 8,410 cfs | → |
| Flint River At Bainbridge | 4,510 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Irwin Mill Dam.
Boat launches
- Desser Landing Road Seminole County
- Jowers Road Houston County
- Fairchild Park Road Seminole County
- River Road 3458, Sneads
- State Park Road Seminole County
- Harvel Pond Road Seminole County
Campgrounds
- Florida Caverns State Park
- Three Rivers State Park
- River Junction - Lake Seminole
- Eastbank - Lake Seminole
- Chattahoochee City Park
- Houston County Center
Fishing spots
Track Irwin Mill Dam 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 Irwin Mill Dam
Where does the data for Irwin Mill 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 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 Irwin Mill Dam.