2025/10/08 Council Agenda Packet

P a g e | 2 Fish Passage Barrier Inventory and Assessments Program Task 2 Desktop Data Review and Complex Culvert Categorization Objective: The Consultant team will gather and analyze data available from City of Everett as well as publicly available from Washington Department of Fish and Wildlife’s (WDFW) Fish Passage inventory. Osborn will use this data in conjunction with the 78 complex unknown barrier status sites to categorize each site based on ease of assessment into three different categories. Consultant Services Osborn will cross reference the 78 complex sites against most recent 2025 WDFW Statewide Inventory to determine whether any of the sites have been assessed by WDFW since the completion of the City’s previous assessment task. Osborn will place each of the 78 complex sites into one of the following three categories: 1. Simple: The site’s fish passage barrier assessment can be completed as part of a desktop survey (e.g. sufficient City or WDFW data has become available since the 2023 study), including a brief site visit to photograph the inlet and outlet. 2. Moderate: The site’s fish passage barrier assessment requires field work as insufficient data is available in City and / or WDFW GIS databases. Field work may include measurement of slope, relative invert elevations using measure-downs, measurement of water surface drop, or measurement of channel cross sections. These sites may require, HY-8, FishXing, or ArcGIS Pro analysis. 3. Complex: The site’s fish passage barrier assessment requires field work in conjunction with hydraulic modeling exceeding the effort covered under Category 2: Moderate. Hydraulic modeling would be performed using HEC-RAS or XP-SWMM, and field assessment may require wetland proximity and extent measurements or complex topographic survey of sites located in deep ravines. Assumptions  The data sources that will be included in the desktop based reconnaissance will be the “Complex Culvert Map Package” GIS data layer provided to the consultant.  The City will provide as-built data for their assets for sites which require further documentation to aid barrier status assessment, when available. Deliverables 1. Provide a categorized list of the complexity of each site broken down into categories of assessment difficulty based on the criteria stated above (Simple, Moderate, and Complex). Task 3 Barrier Assessment Objective: Osborn will conduct fish passage barrier assessments on sites previously identified as “complex”. Osborn will conduct site visits according to the categorized list delivered from Task 2. Consultant Services Osborn will perform fish passage barrier assessments according to WDFW’s Fish Passage Screening and Inventory protocols. Osborn will perform field visits as needed based on the categorization. Each category of complexity consisting of; “Simple, Moderate, and Complex” will require different needs as described in Task 2. Osborn will perform this task through in-person field visits using the necessary equipment needed and as outlined in WDFW’s Fish Passage Screening and Inventory protocols. Osborn’s scope of work includes assessment of up to 25 Simple category sites and up to 25 Moderate category sites. As budget allows, additional sites will be assessed.