The US 101, Jefferson and Clallam counties – Remove Fish Barriers project is part of Washington state’s broader initiative to eliminate barriers restricting salmon migration, reconnecting aquatic habitats and improving long-term ecological health.

As part of Washington State Department of Transportation’s (WSDOT) fish passage program, Atlas is providing environmental and quality assurance services to support the replacement of six fish barriers along US 101 — especially critical for Clallam and Jefferson counties, as they’re located on the northwestern side of the state on the Olympic Peninsula. The project involves constructing five single-span bridges and a buried box culvert to restore natural stream conditions, allowing fish to access historic breeding and rearing habitats.

Atlas is helping WSDOT manage National Environmental Policy Act documentation, Section 404 and 401 permit applications, and environmental compliance measures, aligning project objectives with state and federal regulations.

The Atlas team is working with WSDOT, the Washington Department of Fish and Wildlife and the Jamestown S’Klallam Tribe to integrate permitting strategies with construction schedules so work remains on track while protecting sensitive ecosystems.

In addition to permitting support, Atlas provides fish exclusion, arborist/tree inventory, wetland verification and delineation, and environmental compliance inspections for stormwater management to safeguard sensitive habitats throughout the project.

The team also performs quality assurance and materials testing, overseeing compliance throughout construction so the new structures meet environmental and engineering standards. Fish already are returning to previously blocked streams, demonstrating the benefits of these efforts.

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The SR 520 Bridge Replacement Program is a multibillion-dollar initiative by the Washington State Department of Transportation to enhance safety, reduce congestion, and improve mobility across .

Key components include the world’s longest floating bridge, HOV lanes, and a bicycle/pedestrian path, all designed with environmental stewardship and community engagement in mind.

This project will boost mobility between Seattle and the Eastside while setting new standards for sustainable infrastructure development. We’re providing extensive Quality Assurance (QA) testing and inspection services throughout the corridor.

Key Contributions:

• QA Testing and Inspection: Mobilization and daily operation of on-site testing laboratories for soils, aggregates, and concrete at each project site. QA data management and reporting, supported by multiple teams of inspectors and testers.

• Pontoon Fabrication Plant Support: Atlas assisted with the start-up of the Quality Assurance Program, including the on-site satellite materials testing laboratory for high-strength concrete production and materials tracking documentation.

• Environmental and Materials Tracking: Atlas supports environmental stormwater management and materials tracking to ensure contract compliance.

Atlas ensures that all QA processes adhere to strict contractor schedules, providing round-the-clock support with 25 inspectors/testers working in 24/7 shifts to meet project milestones efficiently.

Specific Segments:

• SR 520 Pontoons Construction ($515 Million): Implemented Quality Assurance Program for high-strength concrete production and materials tracking.

• SR 520 Floating Bridge and Landings ($850 Million): Provided material laboratory testing services, special inspections, and multi-shift QC inspections.

• SR 520 Eastside Transit & HOV Project ($434 Million): Managed QA documentation, environmental work plans, and special inspections.

• SR 520 West Approach Bridge North ($264 Million): Provided initial environmental inspections and stormwater management.

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