South Fork Floodplain Enhancement Phase II

Phase II of the Lower South Fork McKenzie River Floodplain Enhancement Project was completed in late August of 2019. The Project enhanced habitat conditions within a 0.6-mile section of the South Fork McKenzie River directly upstream of the Phase I project sight, restoring connection to over 20 acres of floodplain. Phase II built upon the work completed during Phase I in 2018 that successfully reconnected over 150 acres of floodplain.

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Gallery

Pre-project single thread channel

Large cobble substrate — Pre-project berms

Cobble substrate in shallow section of creek, on South Fork McKenzie River prior to floodplain project — Pre-project cobble substrate

Diversion channel constructed

Super-sacks placed prior to dewatering main-stem

Crews collect and relocate stranded fish

Crews use seins to collect stranded fish

Silt curtain placed across floodplain — Silt curtain in place to minimize turbidity downstream of project

Project managers in hardhats and vests talking in circle — Planning meeting with USFS

Excavator working alongside pile of wood in dewatered floodplain — Excavator filling material in dewatered floodplain

Bulldozer grading dewatered floodplain channel — Bulldozer grading dewatered channel

Decked large wood in dewatered floodplain — Large wood staging

Cleared floodplain with an assortment of gravel — Fill material

Dump truck loaded with sediment — Haul truck on dewatered floodplain

Cleared floodplain with pool of large wood — Leave pool

Large wood surrounded by water — Leave pool with large wood

Large wood in de-watered floodplain — Large wood placed prior to rewatering

Large wood in dewatered floodplain — Additional large wood prior to rewatering

Large wood — Rewatering of floodplain

Large wood in rewatered South Fork McKenzie River Floodplain — Rewatered floodplain

Chinook spawning — Salmon spawning in completed project area – September 2019

Oblique aerial image of South Fork McKenzie River from below Phase II project area — Post-project aerial looking upstream from Phase I

Aerial view of large wood scattered acorss watered floodplain in South Fork McKenzie River — Post-project aerial

Aerial view of large wood scattered acorss watered floodplain in South Fork McKenzie River — Post-project aerial

Oblique aerial view of large wood in watered South Fork McKenzie River following project completion — Post-project aerial

Map showing redds in project area following implementation

Contact

McKenzie Watershed Alliance
P.O. Box 70166
Springfield, OR 97475

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