Julesburg #1 Reservoir Report
Nearby: Julesburg #1a Jumbo
Last Updated: December 5, 2025
Julesburg #1, located in Logan, Colorado, is a privately owned irrigation dam built in 1910 on Cottonwood Creek.
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Summary
Standing at a height of 23 feet with a length of 2730 feet, the dam has a storage capacity of 38,600 acre-feet and serves the primary purpose of irrigation, with additional recreational benefits. Despite its age, the dam's condition was assessed as unsatisfactory during the last inspection in October 2020, posing a high hazard potential.
With a drainage area of 6 square miles and a maximum discharge of 2592 cubic feet per second, Julesburg #1 has an uncontrolled spillway and a surface area of 1578 acres. The dam's risk assessment is moderate, with a risk management plan yet to be specified. The dam is regulated by the Colorado Department of Water Resources, with enforcement, inspection, and permitting carried out by state authorities. As a key water resource in the region, efforts to improve the dam's condition and safety measures are crucial to ensure the protection of downstream communities and the environment.
Year Completed |
1910 |
Dam Length |
2730 |
Dam Height |
23 |
River Or Stream |
COTTONWOOD CREEK-TR |
Primary Dam Type |
Earth |
Surface Area |
1578 |
Hydraulic Height |
23 |
Drainage Area |
6 |
Nid Storage |
38600 |
Structural Height |
23 |
Hazard Potential |
High |
Nid Height |
23 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Platte River Near Crook
|
166cfs |
S. Platte R. At Julesburg
|
-999cfs |
South Platte River At Roscoe Nebr
|
213cfs |
South Platte River At Cooper Bridge
|
13cfs |
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.
Julesburg #1