Julesburg #1a Reservoir Report
Nearby: Julesburg #2 Julesburg #1
Last Updated: December 5, 2025
Julesburg #1a, located in Logan, Colorado, is a privately owned earth dam completed in 1910 for irrigation purposes on Cottonwood Creek.
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Summary
With a height of 18 feet and a length of 735 feet, it has a storage capacity of 38,600 acre-feet and serves a drainage area of 6 square miles. The dam has a high hazard potential and was assessed as unsatisfactory during its last inspection in October 2020.
Despite its age, Julesburg #1a continues to play a crucial role in the region's water resource management, providing essential irrigation water to support agricultural activities. The dam's moderate risk assessment underscores the importance of ongoing maintenance and monitoring to ensure its structural integrity and safety. With state regulation, inspection, and enforcement in place, the dam is subject to regular assessments to mitigate potential risks and protect downstream communities in the event of an emergency.
As a key component of the local infrastructure, Julesburg #1a highlights the intersection of water resource management and climate resilience. Its historical significance and ongoing operation serve as a reminder of the critical role that dams play in sustaining water supplies for agriculture and recreation in the face of changing climate conditions. Through proactive risk management measures and adherence to regulatory guidelines, Julesburg #1a continues to contribute to the sustainable utilization of water resources in the region.
Year Completed |
1910 |
Dam Length |
735 |
Dam Height |
18 |
River Or Stream |
COTTONWOOD CREEK-TR |
Primary Dam Type |
Earth |
Surface Area |
1578 |
Hydraulic Height |
18 |
Drainage Area |
6 |
Nid Storage |
38600 |
Structural Height |
18 |
Hazard Potential |
High |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Platte River Near Crook
|
162cfs |
S. Platte R. At Julesburg
|
-999cfs |
South Platte River At Roscoe Nebr
|
209cfs |
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 #1a