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Hermiston Irrigation District Watershed Plan: Environmental Assessment

Fain Environmental performed geomorphic, hydrologic, and hydraulic analyses for the removal and replacement of an existing pedestrian bridge for Bellingham Parks. We assessed the geomorphology and developed a hydrologic and hydraulic 1-D Hydrologic Engineering Center-River Analysis System (HEC-RAS) to assess the amount of clearance between the 100-year water level and the bottom of the proposed bridge and potential scour. The proposed bridge will adequately convey floodwaters and allow for fish passage.

Hermiston Irrigation District Watershed Plan - Environmental Assessment
Hermiston Irrigation District Watershed Plan – Environmental Assessment

Location: Umatilla County, Oregon

Owner: Hermiston Irrigation District

Year: 2022 to present

Roles

  • Fish Passage Design
  • Hydrologic and Hydraulic Modeling
  • Geomorphic Assessment
  • Scour Analysis