92279

2009-012-00 EXP CHAHALPAM FLOODPLAIN RESTORATION PHASE 2

6/1/2023

9/30/2025

85. Remove/Breach Fish Passage Barrier

Work Element Usage Report

E: 85 - Remove or Replace Barrier Dieckman Creek Tributary Culvert Removal (Site #15)

The Tribe desires to restore floodplain function to the degree possible and this project will continue efforts towards desired future conditions. In 2016, a Floodplain Restoration Alternatives Analysis was developed by River Design Group to identify and prioritize floodplain restoration projects. The document identified 17 project opportunities. In 2021, grant funding was secured from BPA by way of Anchor Habitat Investments (contract 88241) and from OWEB by way of a Restoration Grant (221-3001-18955) to implement two of these projects; implementation occurred in 2022.

This project will continue floodplain restoration at Chahalpam by improving 3 stream crossings and restoring 19 acres of riparian floodplain forest. Current conditions limit channel connectivity, sediment continuity, fish passage, and floodplain function. Results will include opening one-mile of fish passage comprised of 0.6 mile of Dieckman Tributary and 0.4 mile of its tributary, and restoring native floodplain forest.

Site 15 is a culvert on a swale to Dieckman Tributary that may affect fish passage during high flows. It is located near North Santiam River river mile 9. This work will provide access to 0.4 miles of habitat through the removal of a fish passage barrier impacting 1 life stage for 2 species.

Proposed action:
Evaluate culvert and consider removing or replacing culvert to improve conveyance capacity and channel connectivity. Proposed actions include constructing a coffer dam at upstream extent of work area, culvert removal and channel bed stabilization, and site reclamation. See uploads section for River Design Group Cost Estimate.

Restoring fish passage and floodplain function is critical to providing refuge for ESA-listed fish including juvenile Chinook salmon and winter steelhead, and State sensitive species including Oregon chub and Pacific lamprey.

Grant funding was pursued through BPA's Anchor Habitat Investments for the next round of project opportunities. For this project, all 3 in-stream projects are identified in the Floodplain Restoration Alternatives Analysis developed by River Design Group, were chosen as the next "lowest hanging fruit" for implementation and are adjacent to existing restoration efforts. Site 15 is adjacent to 11 ac of of re-established floodplain forest funded by Marion County Soil and Water Conservation District and 24 ac that will be replanted to floodplain forest in 2023.

Remove fish passage barrier at site #15 as per final designs resulting in the following benefits:

* This work will provide access to 0.4 miles of habitat through the removal of a fish passage barrier impacting 1 life stage for 2 species including winter steelhead and spring Chinook.

* restoring native floodplain forest

* Overall water flow

* Floodplain connection

* Several native species will benefit including Oregon chub, juvenile Chinook salmon, winter steelhead, and State sensitive species such as Pacific lamprey, western pond turtle, and northern red-legged frog.

Subcontractor will complete tasks.

$25,081

10.61%

06/01/2023

05/31/2025

In Progress

n/a

n/a

Recurring