Lower Clackamas/ Johnson Creek Confluence Side Channel Reconnection Project
Project Overview
Basics
Lower Clackamas/ Johnson Creek Confluence Side Channel Reconnection Project
Implementation
This project at River Mile 4.6 in the lower Clackamas River increased the inundation frequency and duration of a 1700' relic side channel, removed a culvert in the side channel, and increase the quantity and complexity of the side channels and alcoves at the site. The project included construction of large wood structures along the newly connected side channel as well as several large structures at the inlet and outlet. Over 7 acres of riparian area was treated for invasive plants and then planted after construction. CRBC conduced 3 years of plant stewardship which includes treating invasive plants and monitoring the planted sites for success.
2018
2023
2026
12/2/2024
Location
Organizations
| Funders | |
| Lead Implementer |
Contacts
Isaac Sanders - Clackamas River Basin Council (CRBC) (isaac@clackamasriver.org)
Performance Measures
Expected Performance Measures
| Large Wood Placement | Placement Density: > 25 yrd^3/1000 ft Placement Location: In Channel | 1,680 lf |
| Riparian / Floodplain Native Planting Area | Side of stream / river: Two sides | 14 acres |
| Side Channel Habitat Increase | Inundation frequency: Equal or more frequent than annual | 1,680 lf |
Reported Performance Measures
| Large Wood Placement | |||||
|---|---|---|---|---|---|
| Placement Density | Placement Location | Total | 2024 | 2023 | Units |
| > 25 yrd^3/1000 ft | In Channel | 1,680 | N/A | 1,680 | lf |
| Total | 1,680 | 0 | 1,680 | lf | |
| Riparian / Floodplain Native Planting Area | ||||
|---|---|---|---|---|
| Side of stream / river | Total | 2024 | 2023 | Units |
| Two sides | 10 | 10 | N/A | acres |
| Total | 10 | 10 | 0 | acres |
| Side Channel Habitat Increase | ||||
|---|---|---|---|---|
| Inundation frequency | Total | 2024 | 2023 | Units |
| Equal or more frequent than annual | 1,680 | N/A | 1,680 | lf |
| Total | 1,680 | 0 | 1,680 | lf |
Financials
Budget
| Comment: | None provided |
|---|
Reported Expenditures
| 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | Total | |
|---|---|---|---|---|---|---|---|---|---|
| OWEB Focused Investment Partnership (FIP) (OWEB) | $0.00 | $542.00 | $1,983.00 | $174.00 | $100.00 | $476,400.00 | $53,323.00 | $0.00 | $532,522.00 |
| USFS General Fund (USFS) | $0.00 | $0.00 | $460.00 | $608.00 | $53.99 | $156,182.00 | $8,188.00 | $0.00 | $165,491.99 |
| Grand Total | $0.00 | $542.00 | $2,443.00 | $782.00 | $153.99 | $632,582.00 | $61,511.00 | $0.00 | $698,013.99 |
| Note: | No expenditures noted |
|---|
Focal Species
Focal Species
Side channel would provide off channel refugia.
Side channel would provide off channel refugia.
Project Types
Project Types
FIP Bienniums
FIP Bienniums
Project Details
Attachments
As built plan set
- Uploaded On
- 4/12/2024
- File Type
- Description
- As built plan set from Interfluve Inc
No attachments
Notes
| 12/05/2017 2:03 PM | Zachary Bergen | Project Prioritization: 1.) Focal species affected: - Two species 2.) Limiting factors addressed: - Addresses two or more primary and at least one secondary 6e 3. Physical habitat quality: Degraded channel structure and complexity. 6e 4. Physical habitat quality: Degraded floodplain connectivity and function. 6e 1. Physical habitat quality: Degraded riparian areas and large wood recruitment. 6e 2. Physical habitat quality: Isolated side channels and off-channel habitats. 3.) Project protection benefits: - Minimal protection from three private landowners. 4.) Processed-based restoration -Partial restoration- Project partially addresses restoring natural processes. Restoration actions would include wetland enhancement, riparian restoration, the creation of side channels, invasive species removal, and native plantings. 5.) Threats addressed: -Climate change resiliency- Restoration partially or fully addresses climate change resiliency and the project focuses on key habitats that provide resiliency. - Urbanization/development impacts- Restoration actions partially address habitat and watershed processes associated with current and future watershed urbanization. 6.) Project size and scale: - Stream projects (linear scale)- 1/4 to 1/2 mile in length - Floodplain/ riparian area extent (lateral extent)- Floodplain/riparian activities improve degraded conditions and restore natural processes and channel meander corridors. 7.) Project readiness, constraints, and risks: -Project readiness- The project's conceptual design does consider other factors such as constructability and how project effectiveness will be demonstrated. -Project constraints and risks- There are few or no feasibility constraints or risks that may limit overall project success. 8.) Outreach, landowner relationship, and socio-economic benefits: -One of the three landowners is an enthusiastic landowner who supports tours or outreach activities on their property. -It is unknown if the remaining two landowners support tours or outreach activities on their properties. |
External Links
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