FERN RIDGE LAKE NEAR ELMIRA

RESERVOIR LEVELS USGS 14168000
April 28, 2025


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Fern Ridge Dam, also known as Fern Ridge Lake, is a Federal-owned structure located in Eugene, Oregon, along the Long Tom River. Completed in 1941, the earth dam stands at a height of 46 feet and serves primarily for Flood Risk Reduction. With a storage capacity of 121,000 acre-feet and a surface area of 9360 acres, the dam plays a crucial role in mitigating flood risks in the region.

However, the dam faces a high Hazard Potential due to its proximity to the Cascadia Subduction Zone fault, which poses a risk of significant earthquake-induced damage. To address this risk, the US Army Corps of Engineers (USACE) is conducting advanced risk assessments to better understand potential damages and the likelihood of an uncontrolled release of water post-earthquake. USACE is also implementing risk management measures, including routine inspections, instrumentation for monitoring dam performance, and emergency action plans to safeguard the community in case of an emergency.

Despite the potential risks, USACE remains confident in the integrity of Fern Ridge Dam and its ability to reduce flood risks for the region. The ongoing efforts to assess and manage risks associated with the dam reflect USACE's commitment to ensuring the safety and security of the surrounding communities in the face of potential natural disasters.

Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft 24hr Change 0.01%
Percent of Normal 100%
Minimum 351.96 ft
2021-12-02
Maximum 374.43 ft
2023-12-04
Average 372 ft
Dam_Height 46
Hydraulic_Height 40
Drainage_Area 275
Year_Completed 1941
Nid_Storage 121000
Structural_Height 49
Primary_Dam_Type Earth
Foundations Soil
Surface_Area 9360
Hazard_Potential High
River_Or_Stream LONG TOM RIVER
Dam_Length 6610
Nid_Height 49
       
Seasonal Comparison
Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft Levels

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