YEAR OVER YEAR
SUMMARY
| Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft 24hr Change | 0% |
| Percent of Normal | 100% |
| Minimum |
351.96 ft
2021-12-02 |
| Maximum |
374.43 ft
2023-12-04 |
| Average | 354 ft |
| Dam_Height | 46 |
| Hydraulic_Height | 40 |
| Drainage_Area | 275 |
| Year_Completed | 1941 |
| Nid_Storage | 121000 |
| Structural_Height | 49 |
| River_Or_Stream | LONG TOM RIVER |
| Foundations | Soil |
| Surface_Area | 9360 |
| Hazard_Potential | High |
| Dam_Length | 6610 |
| Primary_Dam_Type | Earth |
| Nid_Height | 49 |
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.
