Paine Field Expansion Wetland Mitigation Bank

Snohomish County Airport (

Snohomish County Airport was able to relocate its runway as mandated by the FAA and create critical areas mitigation for new construction thanks to a 48-acre wetland restoration designed and permitted by The Watershed Company.

The property was sculpted and revegetated to create eight acres of new wetland, and 15 acres of enhanced upland buffer. 80,000 cubic yards of material was excavated. A half-mile boardwalk, two-mile jogging path, and nine interpretive signs were installed to encourage citizen use and appreciation of the mitigation bank: Narbeck Wetland Sanctuary.  The Watershed Company provided permit applications, working with Everett, Snohomish County, Ecology, WDFW, U.S. Environmental Protection Agency, and the Corps.

For seven years, scientists monitored performance of the $3.5 million project, completing annual reports on hydrology, water quality, vegetative cover, and wildlife. The mitigation met 100% compliance a year ahead of schedule because of excellent design and aggressive adaptive management to ensure habitat improvement.

Oblique aerial of pools, trails, and enhanced wetlands at a wetland mitigation bank for Snohomish County Airport

Narbeck Wetland Sanctuary was created as a mitigation bank for new construction.

Wetland pond with large woody debris and native plants

A 48-acre wetland restoration was designed and permitted by The Watershed Company.

A boardwalk lets visitors see the restored wetlands up close

Local schools use the Sanctuary as an outdoor classroom

Biologist monitoring vegetation at the wetland mitigation bank

Seven years of monitoring the site performance resulted in meeting compliance one year early.

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"Narbeck Wetland Sanctuary … has been exceptional from the process side of involving the resource agencies and public, and the initial environmental and ecological results."

Linda Storm, U.S. Environmental Protection Agency