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[Portal ID #1943]

Chehalis - Dillenbaugh Creek Culvert Assessment Project

Summary of the project
Last Updated: April 2, 2017
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Click HERE To See Project Financials
2015-17 Funding -- Flood Authority authorized $110,000 at their 4/21/2016 meeting (see 5/20/2016 FINAL signed funding agreement here).
Project Financials -- See separate project financials website here.
Description -- Chehalis will complete an inventory and assessment of culverts along Dillenbaugh Creek and associated tributaries along the lowland reach bordering the City of Chehalis. Assessment of the culverts will also include an evaluation for fish passage requirements prescribed by WDFW sizing criteria. This study will also allow the city to identify and plan for upsizing culverts along the Dillenbaugh Creek to meet current fish passage standards. The existing size, type, and condition will be evaluated for all culverts. The culvert inventory and assessment will then be used to complete an analysis to determine flow capacity/deficiencies in capacity of culverts. This will aid in determining which culverts act to limit conveyance, resulting in localized flooding during storm events. The results of the inventory and modelling will be described and documented in a comprehensive report.
Flood Hazard Reduction Benefits -- Project will benefit the Community as it will help the City to more precisely identify future capital improvements that can alleviate local funding.
Project Status -- On-Track, Underway.
  • October 2016 – Assessment and inventory completed.
  • January 2017 – Basin modelling and report complete (see here).
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