Cowlitz County approves engineering supplements for Tower Road culvert and Allender Road fish-passage project

Nov 4, 2025

Cowlitz County approved two supplemental professional-service agreements on Tuesday: a $500,000 increase with WSP USA to complete outstanding engineering work including the Tower Road Rock Creek culvert replacement, and a $207,834.60 supplement with OTAC Inc. for final design and permitting on the Allender Road fish-passage project.

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Susan Eugenis, the county engineer, told the commissioners the county requested Supplemental Agreement No. 4 to the local agency standard consultant agreement with WSP USA to complete existing projects the consultant is already supporting, adding $500,000 to the contract. Eugenis said the largest remaining task under that agreement is the Tower Road Rock Creek culvert replacement, which currently has a temporary bridge in place and is slated for final construction in 2026.

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