Resource Management

Osborn Pacific Group provides a range of ecological restoration capabilities and experience to renew degraded coastal, aquatic, and terrestrial ecosystems. We conduct investigations, evaluations, monitoring, planning and design to:

  • Restore and Enhance Wetlands and Wildlife Habitats
  • Reintroduce Native Species
  • Invasive Species Control
  • Daylight and Enhance Streams
  • Stream Bank/Shoreline Restoration and Stabilization
  • Establishment of Riparian Buffer Zones
  • Fish Passage Design
  • Substrate Enhancement and Restoration
  • Coastal Marsh Restoration
South Park Bridge
New Intertidal Zone and Landscape

South Park Bridge

When King County bridge inspections determined the historic but failing South Park Bridge was becoming a safety hazard, they selected a design team to prepare plans for a larger replacement structure that would accommodate the projected future increasing commercial and general traffic volumes. Osborn Pacific Group was the environmental consultant on the bridge design team, responsible for restoring aquatic and terrestrial habitat functions to this important but severely degraded reach in the lower Duwamish River. This lower reach of the river is very important in juvenile salmon’s lifecycle because this is where they become acclimated to salt water.  The shoreline enhancement and mitigation included removal of bank armoring, creation of a new intertidal zone, positioning rootwads, and specifying emergent plants in the tidally influenced aquatic habitat zone. In the bioengineered upland riverbank habitat zone, Osborn Pacific Group included riparian trees and shrubs. Protective netting was specified to discourage Canadian geese. This mitigation will partially offset affected functions and values within the Duwamish Basin.

Shoreline Restoration
Salt Water Marsh with Netting

Turning Basin 3,
Salt Water Marsh Habitat Restoration

NOAA in combination with the other tribal, federal and state stakeholders in the Elliott Bay/Duwamish Restoration Program Panel identified the Turning Basin 3 site as an opportunity to restore salt water marsh habitat at this former marina site on the Duwamish River. Osborn Pacific Group interpreted tidal cycle frequencies and salinity concentration patterns in this lower reach of the river to prepare earthwork and landscape plans to match the requirements of a salt marsh.  This site is one of several other restoration sites in the same general area, the goal being to restore natural aquatic and terrestrial habitat functions to former industrial areas along the river. A waterfowl predation netting system was necessary to allow the emergent plants to become established to adequate densities to survive their role as a food source for waterfowl.  This salt marsh site provides a source of food for out-migrating juvenile salmon.

Under Construction
Under Construction

Sha Dadx Habitat Restoration

Sha Dadx Habitat Restoration was designed to restore critical side-channel juvenile salmon fish habitat in a 17-acre oxbow that was cut off from the Puyallup River in the early 1900s. This habitat restoration site was connected to the Puyallup River by constructing a 120-foot-long culvert through the levee. Osborn Pacific Group contoured the site to save existing large trees and accommodate a variety of salinity levels during daily tidal cycles. Osborn Pacific Group prepared revegetation plans that included emergent, forested scrub/shrub and upland native plant communities with logs and rootwads in pooled areas. The existing trees in combination with overhanging shoreline vegetation provide excellent habitat for juvenile salmon feeding, rearing, and resting. The site also is a corridor for small mammals and hosts migratory waterfowl and shore birds.

 

The Puyallup Tribe called this project the “crown jewel” of the tribe’s restoration projects and it was also the recipient of the 2010 American Council of Engineering Companies (ACEC) Bronze Award.