Elk Rock Island Side Channel Enhancement
Project Overview
Basics
Elk Rock Island Side Channel Enhancement
Planning/Design
This project includes placement of key pieces of large wood in the back channel alcove and floodplain, management of invasive plants, and restoration of native wetland and riparian plant communities. We will also look at retrofitting an existing stormwater outlet to treat stormwater entering the project site. This project will enhance winter rearing habitat for anadromous fish. There are very few opportunities for back channel enhancements on the Lower Willamette River and this project offers a unique opportunity to improve much needed winter refuge habitat for outmigrating juvenile anadromous fish. The majority of this property is owned by the City of Milwaukie and managed by NCPRD.
2023
2026
2027
12/18/2024
Location
Organizations
| Funders | |
| Lead Implementer | |
| Other Partners | City of Milwaukie, North Clackamas Parks & Recreation District, Friends of Spring Park - Elk Rock Island, Island Station Neighborhood Association |
Contacts
Amy van Riessen - North Clackamas Watersheds Council (NCWC) (amy@ncwatersheds.org)
Performance Measures
Expected Performance Measures
| Large Wood Placement | Placement Density: 15 - 25 yrd^3/1000 ft Placement Location: In Channel | 950 lf |
| Large Wood Placement | Placement Density: 15 - 25 yrd^3/1000 ft Placement Location: Floodplain | 950 lf |
| Riparian / Floodplain Invasive Species Removal Area | Side of stream / river: Both sides of stream | 3.5 acres |
| Riparian / Floodplain Native Planting Area | Side of stream / river: Two sides | 3.5 acres |
Reported Performance Measures
Reported Performance Measures are not relevant for Projects in the Planning/Design stage.
Financials
Budget
| Comment: | Estimated construction costs increased due to access issues and need to barge in materials. |
|---|
Reported Expenditures
| 2023 | 2024 | 2025 | Total | |
|---|---|---|---|---|
| City of Milwaukie (City of Milwaukie) | $0.00 | $0.00 | $0.00 | $0.00 |
| NOAA Transformational Habitat Restoration and Coastal Resilience Grants (NOAA) | $0.00 | $0.00 | $0.00 | $0.00 |
| OWEB Focused Investment Partnership (FIP) (OWEB) | $0.00 | $0.00 | $0.00 | $0.00 |
| Grand Total | $0.00 | $0.00 | $0.00 | $0.00 |
| Note: | None provided |
|---|
Focal Species
Focal Species
Enhancement of high flow refugia and cover for juvenile coho during migration and rearing in the Willamette, benefitting the Clackamas Population as they move downstream in early fall-winter flows and remain in the basin for 14 months before migrating to the ocean.
Juvenile fall Chinook will benefit from confluence large wood during rearing in the Willamette where side-channel refugia opportunities are minimal (USGS, 2018).
Large wood will provide instream cover for out-migrating juveniles (macrophthalmia).
Spring Chinook from the Clackamas, Molalla, Santiam and McKenzie Rivers rear in the lower Willamette River for up to 14 months. Sub-yearlings are expected to benefit from the side-channel complexity established from this project for resting from high flows, and instream feeding cover.
Clackamas, Molalla, Santiam, and McKenzie winter steelhead migrate through the lower Willamette, where side-channel habitat and instream cover is critically limited.
Project Types
Project Types
The project will address both habitat creation and the restoration of natural processes that will restore longer-term ecological function beyond the life of the project in these areas:
Lack of Complexity: large wood, accumulation of wood from the Willamette, gravel accumulation
Invasive Removal & Native Riparian Restoration: restoration of shade, large wood sourcing in the future, resistance of invasives and reinfestatations.
Water Temperature: Improvements on temperature in alcove and retention of cold water on site.
See attachment for complete description due to space limitations.
FIP Bienniums
FIP Bienniums
Project Details
Attachments
30% Design
- Uploaded On
- 12/18/2024
- File Type
- Description
- 30% design drawings have been completed by WaterWays Consulting.
Elk Rock Island Letter of Support City of Milwaukie
- Uploaded On
- 10/3/2022
- File Type
- Description
- Letter of Support from Landowner (City of Milwaukie)
Concept Design and Estimate of Probable Costs
- Uploaded On
- 10/3/2022
- File Type
- Description
- Concept Design & Cost Estimate provided by GeoEngineers, 7/31/2022
FIP IIJA Funding & Budget Note
- Uploaded On
- 10/3/2022
- File Type
- Description
- Suggested description of request to Clackamas Partnership FIP based on NOAA Fisheries IIJA Pending Grant
Elk Rock Island Back Channel Enhancement Proposal Evaluation Reponse Form
- Uploaded On
- 10/3/2022
- File Type
- Description
- Narrative responses to evaluation questions
No attachments
Notes
No Notes entered.