Scour Mitigation in Washington

Scour Mitigation in Washington

Engineered scour mitigation across Washington—I-90 Snoqualmie Pass. Design/build solutions for WSDOT corridors and critical infrastructure.

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River scour erosion on road embankment before stabilization, Route 619

Scour Mitigation Across Washington

Washington's scour mitigation needs span Puget Sound's tidal and seismic exposure and the Cascade Range's snowmelt-driven river flow, and WSDOT infrastructure across these varied settings requires scour protection calibrated to whichever flow regime and seismic hazard level a given site presents.

This pattern is consistent with the broader Washouts & Scour Damage challenges GSI addresses across the state.

Geohazard Mitigation in Washington

Scour Mitigation in WA?

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How GSI Delivers Scour Mitigation in Washington

Riprap and Armor Stone Protection

Riprap and armor stone for Washington's Puget Sound infrastructure are sized for tidal flow patterns distinct from the Cascade Range's snowmelt-driven river dynamics. GSI's bridge solutions capability supports this step.

Grout-Filled Mattress Systems

Grout-filled mattress systems for Washington bridge crossings account for the state's Cascadia subduction zone seismic exposure alongside standard scour protection. This is one application of GSI's broader emergency bridge repair expertise.

Bridge Foundation Reinforcement

Sheet pile and grouted rock protection at Washington bridge foundations addresses both tidal and snowmelt-driven scour depending on site location. GSI's coastal and bluff stabilization experience informs this approach.

This approach is informed by GSI's broader water infrastructure work across Washington.

Washington Scour Mitigation Process

GSI follows a systematic five-step process to deliver scour mitigation solutions in WSDOT corridors and beyond.

Step 1

Site Assessment

GSI engineers evaluate conditions and severity at your Washington site.

Step 2

Root Cause Investigation

In-house geologists investigate the specific conditions driving the issue, referencing Washington's Cascade volcanics, Columbia River Basalt, and seismically active Puget Sound terrain.

Step 3

Engineered Solution Design

Custom design matched to Washington's site-specific geology, hydrology, and infrastructure loading.

Step 4

Design/Build Execution

One team executes the engineered solution under a single WSDOT-ready contract.

Performance Warranty

Design/build/warranty coverage on every scour mitigation solution installed in Washington.

Performance Warranty

Design/build/warranty coverage on every scour mitigation solution installed in Washington.

Bridge pier scour mitigation installation in riverbed

Why Washington Trusts GSI for Scour Mitigation

Engineered for Washington's conditions. GSI's Washington scour mitigation adapts to the state's dual exposure — Puget Sound tidal dynamics and Cascade Range snowmelt flow — within one DOT's jurisdiction. It's backed by GSI's broader transportation infrastructure and engineers capability.

Design/build delivery. One team designs and builds — avoiding the miscommunication between separate design and build firms.

WSDOT specification compliance. Engineering records and field methods satisfy state DOT requirements beginning with the first engineering package.

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Washington Clients Report on Scour Mitigation

WSDOT partners and Washington infrastructure owners describe GSI's scour mitigation results.

Retaining Wall Repair for Commercial Property in Ohio

I wanted to let you know how impressed we were with your company. Time will tell how well it all worked, however, the professionalism and quality of your team was most obvious. I truly believe we could not have picked a better company for this large endeavor. I was there yesterday showing it to our owner, and was quite proud of the work you did. Everything you promised, you delivered. And though there were a couple snafus, based on a job this large, it was beyond minor and also you made it all right in the end. Thank you for that. In speaking with Tammie, our Property Manager and Dave--the quality of your guys working was top notch.

Again, ask me years from now how it is working, but if ever we had another job with your name on it, it would be a pleasure and honor to work with you again!

Landslide Repair for Infrastructure in California

“I would like to thank you and the county for repairing the road slide on Dunne avenue. The repair is excellent and the contractors were very efficient and skilled. You personally did a great job of providing information about the status of the project. My family appreciates your efforts.”

Erosion Control for Water Infrastructure in Minnesota

I am sending this to you from Duluth Minnesota where 4 of your employees just finished working on a wall they had put in for us previously. That was a few years ago after Duluth suffered a flood. We are on Lake Superior and St. Louis County wanted to help stop erosion. The guys worked during the rain and just kept on going, like little Energizer bunnies. Nice fellows, all of them!! They are certainly a credit to your company and I feel it is always good to give thanks to people for a job well done. Please let them know how much we appreciated their dedication to get the job done. We will always wish you and your team good days ahead!!

Scour Mitigation in Washington

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