Julesburg #4 Reservoir Report
Nearby: Julesburg #3 Julesburg #2
Last Updated: December 5, 2025
Julesburg #4, also known as Big Jumbo, is a privately owned irrigation dam located in Sedgwick, Colorado.
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Summary
Completed in 1910, this earth dam stands at a height of 33 feet and has a length of 2400 feet, providing a storage capacity of 38,600 acre-feet to support irrigation activities in the region. Situated on the South Platte River, the dam has a spillway width of 600 feet and a maximum discharge capacity of 1400 cubic feet per second, making it a crucial infrastructure for water management in the area.
Despite its importance, Julesburg #4 poses a high hazard potential due to its unsatisfactory condition as assessed during the last inspection in October 2020. The dam's Emergency Action Plan (EAP) status and risk assessment indicate a moderate risk level, prompting the need for consistent monitoring and potential risk management measures to ensure the safety of the surrounding community. With its historical significance and key role in irrigation, Julesburg #4 serves as a critical piece of water resource infrastructure in Colorado, highlighting the intersection of water management, climate resilience, and infrastructure maintenance in the face of changing environmental conditions.
Year Completed |
1910 |
Dam Length |
2400 |
Dam Height |
33 |
River Or Stream |
SOUTH PLATTE RIVER-TR |
Primary Dam Type |
Earth |
Surface Area |
1578 |
Hydraulic Height |
33 |
Drainage Area |
6 |
Nid Storage |
38600 |
Structural Height |
34 |
Hazard Potential |
High |
Nid Height |
34 |
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 #4