South Junction Reservoir Report
Last Updated: March 31, 2026
South Junction is a privately-owned irrigation structure located in Box Elder, Utah, specifically in the city of Lynn.
Summary
Managed by the Utah Division of Water Rights, this dam on South Junction Creek was completed in 1958 and serves the primary purpose of irrigation. With a height of 47 feet and a hydraulic height of 44 feet, it has a storage capacity of 865 acre-feet, making it a significant water resource in the area.
Designed by the USDA NRCS, South Junction is regulated, permitted, inspected, and enforced by the state of Utah, ensuring its safety and compliance with water management regulations. The dam is situated in a strategic location with a drainage area of 6.2 square miles, providing vital water supply for agricultural activities in the region. Despite being marked as having a significant hazard potential, its condition assessment is currently not rated, highlighting the need for further evaluation and potential risk management measures.
Located within the Sacramento District, South Junction plays a crucial role in water resource management and climate adaptation efforts in the area. With its historical significance dating back to the mid-20th century, this earth dam stands as a testament to the importance of sustainable water infrastructure for supporting agriculture and local communities. As water enthusiasts and climate advocates continue to monitor and assess the dam's condition, it remains a focal point for ensuring water security and resilience in the face of changing environmental conditions.
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15-Day Weather Outlook
Year Completed |
1958 |
Dam Length |
1235 |
River Or Stream |
SOUTH JUNCTION CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
44 |
Drainage Area |
6.2 |
Nid Storage |
865 |
Structural Height |
47 |
Hazard Potential |
Significant |
Nid Height |
47 |
Seasonal Comparison
5-Day Hourly Forecast Detail
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.
South Junction