Florence South Res. No. 1 Reservoir Report
Nearby: Gains Florence South Res. No. 2
Last Updated: December 14, 2025
Florence South Reservoir No.
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Summary
1, also known as North Cell, is a local government-owned water supply reservoir located in Coal Creek, Colorado. Completed in 1904, this earth dam stands at a height of 30 feet and has a storage capacity of 325 acre-feet. The reservoir serves the primary purpose of water supply and is regulated by the Colorado Department of Water Resources, with state permitting, inspection, and enforcement measures in place.
With a surface area of 15 acres and a maximum discharge of 25 cubic feet per second, Florence South Reservoir No. 1 plays a crucial role in the water management of the area. Despite being classified as having a high hazard potential, the dam is assessed to be in fair condition as of the last inspection in April 2020. The Emergency Action Plan (EAP) for the reservoir meets guidelines, and risk management measures are in place to address potential risks associated with the dam.
Overall, Florence South Reservoir No. 1 is a vital water resource infrastructure in Custer County, Colorado, providing essential water supply for the region. As a significant component of the local water management system, the reservoir's condition and regulatory compliance ensure the safety and sustainability of its operations for the community it serves. Climate and water resource enthusiasts would find value in studying the management and maintenance practices of this historic dam to understand its role in addressing water supply challenges in the region.
Year Completed |
1904 |
Dam Length |
525 |
Dam Height |
30 |
River Or Stream |
ALKALI CREEK-OS |
Primary Dam Type |
Earth |
Surface Area |
15 |
Hydraulic Height |
30 |
Nid Storage |
325 |
Structural Height |
35 |
Outlet Gates |
Drum - 0 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
35 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Mingus Ranch Cabin
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Oak Creek
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Ophir Creek Campground
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Ophir Creek
|
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Davenport
|
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Davenport Campground
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Florence South Res. No. 1