Start Date

2-3-2021 10:20 AM

End Date

2-3-2021 11:25 AM

Abstract

The Harborton Habitat Enhancement Project (Harborton) recreated off-channel floodplain habitat and preserved adjacent natural areas for salmonids and other species on 54 acres adjacent to the Willamette River at river mile 3.1. Pre-construction habitat included a 20-acre PGE facility, historic dredge disposal site, and a seasonally flooded wetland that is regionally significant breeding habitat for northern red-legged frog (Rana aurora aurora). This wetland was preserved in its entirety; adjacent upland and wetland habitats were modified to create floodplain and a new backwater channel. Site work involved removing 154,000 cubic yards of historic dredge from the floodplain, creating a new stream channel, installing 363 large wood pieces, and planting approximately 84,000 native plants. Earthwork and habitat structures were completed October 2020; plantings were completed January 2021. The new channel, vegetation, red-legged frog habitat and other metrics will be monitored for the next 10 years. Lessons learned from project design, planning, and construction will be shared.

Subjects

Habitat restoration

Persistent Identifier

https://archives.pdx.edu/ds/psu/35485

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Mar 2nd, 10:20 AM Mar 2nd, 11:25 AM

Harborton Habitat Enhancement Project

The Harborton Habitat Enhancement Project (Harborton) recreated off-channel floodplain habitat and preserved adjacent natural areas for salmonids and other species on 54 acres adjacent to the Willamette River at river mile 3.1. Pre-construction habitat included a 20-acre PGE facility, historic dredge disposal site, and a seasonally flooded wetland that is regionally significant breeding habitat for northern red-legged frog (Rana aurora aurora). This wetland was preserved in its entirety; adjacent upland and wetland habitats were modified to create floodplain and a new backwater channel. Site work involved removing 154,000 cubic yards of historic dredge from the floodplain, creating a new stream channel, installing 363 large wood pieces, and planting approximately 84,000 native plants. Earthwork and habitat structures were completed October 2020; plantings were completed January 2021. The new channel, vegetation, red-legged frog habitat and other metrics will be monitored for the next 10 years. Lessons learned from project design, planning, and construction will be shared.