Junction Reservoir Report

Last Updated: December 4, 2025

Junction is a small unincorporated community located in Northern California.


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Summary

The area is known for its rich history, which includes the discovery of gold in the 1850s. The community is situated at the confluence of the North Fork and Middle Fork of the American River, which makes it an important hydrological site. The river system provides surface flow for agricultural uses in the region, and snowpack from the nearby Sierra Nevada Mountains provides additional water resources. The area has a thriving agricultural industry with crops such as apples, peaches, and cherries. Additionally, the region is popular for recreational activities such as fishing, hiking, and camping. The area is also home to several historic sites, including the remains of gold rush-era mining towns.

Reservoir Details

Storage 24hr Change -3.81%
Percent of Normal 83%
Minimum 144.0 acre-ft
2023-11-02
Maximum 3,300.0 acre-ft
2004-04-30
Average 2,311 acre-ft
Nid_Height 168
Hydraulic_Height 150
Primary_Dam_Type Concrete
Drainage_Area 142
Year_Completed 1962
Dam_Height 168
Structural_Height 168
Surface_Area 64
Nid_Storage 3000
River_Or_Stream South Fork Silver Creek
Dam_Length 525
Hazard_Potential Significant
       
Seasonal Comparison
Storage Levels
Pool Elevation Levels
Top Conserv Storage Levels
Inflow Levels

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.