Irwin Mill Dam Reservoir Report
Nearby: Billy Byrd Howards Mill Lake Dam
Last Updated: January 11, 2026
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.
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Summary
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.
Year Completed |
1970 |
Dam Length |
250 |
Dam Height |
10 |
River Or Stream |
IRWIN MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
10 |
Nid Storage |
66 |
Structural Height |
6 |
Hazard Potential |
Low |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Sawhatchee Creek At Cedar Springs
|
20cfs |
Spring Creek Near Iron City
|
72cfs |
Spring Creek Near Reynoldsville
|
267cfs |
Chipola River At Marianna Fl
|
229cfs |
Apalachicola River At Chattahoochee Fla
|
8080cfs |
Flint River At Bainbridge
|
3600cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
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. Investigations and studies are necessary.
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.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams 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, environment 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.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Irwin Mill Dam