May 2014

Otak’s Sara Junction Slope Stabilization project recently won an APWA Washington Project of the Year Award in the Disaster/Emergency, Less Than $5 Million category! Quinn Donnelly accepted the award yesterday at an APWA Washington Award Luncheon. Below is a brief overview of the project.

Otak led the design team tasked with the emergency roadway and embankment repair of NW 179th Street in rural Clark County. The roadway had been forced to close due to undercutting and embankment failure caused by stream bank erosion on adjacent Whipple Creek. Site assessment for use in the project design included stream characterization and hydraulic modeling. The design included a rebuilt roadway with guardrail, a new rock embankment to support the roadway and 100 feet of bioengineered stream bank protection, including large wood and wrapped soil lifts to prevent erosion, provide habitat, and minimize impact to the active stream channel. The design allowed for streamlined permitting, so that the repairs could be done promptly.


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