DESCRIPTION
Investigations into the replacement of the culverts in place advanced to a conceptual level. It was quickly recognized that due to a multitude of factors that the significant investment spent correcting the barriers would deliver considerable habitat and hydraulic impacts due to the roadway improvements associated with upgraded crossings. Replacing the culverts in place would lock the Hoko Ozette road onto a spot on the landscape that was detrimental to habitat forming processes(including fish habitat) in the name of fish passage. It was clear that the civil solution to replacing the structures in place was at odds with the environmental, geomorphic, biological, and hydraulic setting of the landscape. A solution to this conflict was not apparent despite investigations. It became clear that investment in the replace in place option would not provide a significant return on the investment, and could potentially deliver a loss.
FBRB was approached for a change in the project scope of work to allow for investigations leading to the development of conceptual level realignments as described in the Project Agreement Description.
The realignment conceptual design effort began by sketching possible alignments on aerial imagery using LiDAR hillshades to inform the alignment. Hydraulic models were used to further inform potential alignment locations and new crossing sizings. Parcel maps were used to identify key landowners so that they could be contacted and invited into discussions regarding the constraints of utilizing their property. Civil design concentrated on potential crossing types and sizes and establishing rudimentary grading and alignment plans to allow the development of cost estimates. All information gathered and developed was pulled together into a single design report.