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Lodge Creek Culvert Replacement
Project Information
- Project Location:
- WA
- Approx Contract:
- $350,000
- Status:
- Completed - Dec 2016
- Structure Type:
- Sewage / Water Treatment Plant
References
- Client:
- Kittitas County
Scope Of Work
The existing 4-foot diameter corrugated metal pipe culvert that conveys Lodge Creek under Via Kachess Road failed during heavy rains in early spring 2016—undermining the existing road fill and pavement.
The project required close coordination with resource and regulatory agencies to meet the aggressive four-month design and construction schedule. This required regular coordination meetings with Kittitas County, the USACE, DOE, WDFW, USFWS, NMFS, USFS, and Yakama Nation. This included developing a multi-disciplinary team consisting of experts in design (e.g., geotechnical, structures, roadway, and construction), environmental (e.g., biology, permitting, and cultural resources), and construction.
The project geotechnical conditions underlying the road embankment were composed of fine silt and organics, there is a high value wetland upstream of the existing failed culvert, and a degraded scour condition downstream of the roadway. The downstream condition created a plunge pool fish passage barrier, which adversely impacted stream and riparian habitat, and had a risk of draining the upstream wetland if not designed and constructed to avoid head-cutting and channel instability.
During the first workshop, Atkinson evaluated the proposed open-bottom design and determined a four-sided box culvert would eliminate many of the associated geotechnical risks. Atkinson also proposed a 3-day roadway closure to remove and install the new culvert—based on production rates at the recently completed Jovita Creek culvert replacement in Auburn, WA. Atkinson installed a new 40-foot-long, 19-foot-wide, closed-bottom, 4-sided precast concrete box culvert together with up- and downstream riparian habitat. The new culvert better conveys large Lodge Creek flow events, improves fish passage, and the new roadway provides reliable residential and emergency access to homes along Lake Kachess.
Market Sector
Roadways & Bridges
Capabilities
Self Performance
Designer
Jacobs Engineering Group Inc.
Project Images
