Sieben-Riverbend Side Channel Enhancement
Limiting Factor
Isolated Side Channels and Off-Channel Habitats
Lead Implementer
Clackamas River Basin Council
Funders
Bureau of Land Management, Metro Nature in Neighborhoods, Oregon Watershed Enhancement Board
Project Primary Contact
Isaac Sanders (isaac@clackamasriver.org)
Project Stage
Completed
Duration
2022 - 2024
Degraded Channel and Riparian Areas
Isolated Side Channels and Off-Channel Habitats
The Sieben Creek side channel reconnection project is on private property upstream of Sah-Hah-Lee Golf Course and downstream of the Rock Creek Confluence with the Clackamas River. The project increased channel complexity and connectivity of the 1/3 mile long side channel. The constructed apex jam is racking up material and created a scour pool frequented by juvenile salmonids and other native fishes. Habitat structures throughout the channel have added structure, provide cover and help form scour pools. Log structures built in the alcove at the downstream end of the project provide additional complexity and habitat for our native fish and wildlife.
Key Accomplishments
- Large Wood Placement: 1,750.00 lf
- Riparian / Floodplain Invasive Species Removal Area: 4.00 acres
- Riparian / Floodplain Native Planting Area: 4.00 acres
- Side Channel Habitat Increase: 1,750.00 lf
Focal Species
- Coho
- Fall Chinook
- Pacific Lamprey
- Spring Chinook
- Steelhead
Project Types
- Outreach / Landowner Engagement
- Restoration
FIP Bienniums
- FIP Biennium 1 work plan
Apex Jam at inlet of side channel
Location
Expenditures
Expenditures by Fund to Date: $675,987.23
Metro Nature in Neighborhood... (Metro): $14,328
OWEB Focused Investment Partn... (OWEB): $594,159
Bureau of Land Management (BLM): $67,500
Photos
Looking upstream of from the confluence of Sieben Creek and Clackamas River (Timing: Before)
Location of potential side channel (Timing: Before)
Confluence of Sieben Creek and potential side channel (Timing: Before)
Apex jam mid construction (Timing: During)
Log jam during construction (Timing: During)
Excavating at the inlet of the side channel (Timing: During)
Apex jam on left just after construction (Timing: During)
Large wood racked up on one of the installed large wood structures (Timing: After)
Looking down side channel towards Siben Creek confluence (Timing: After)
Building bat boxes with Clackamas River Community Cooperative memebers (Timing: After)
Large wood recruited on placed structures in the side channel below Sieben Ck confluence (Timing: After)
Looking up side channel at apex jam and inlet during high flow (Timing: After)
Sieben Creek confluence with the side channel at high flow (Timing: After)
Looking up side channel at apex jam during average winter flow (Timing: After)
Sieben Creek confluence with the side channel at low flow (Timing: After)
Project last updated 12/2/2024