Montesano - WWTP Wynoochee River Bank Protection Project

Update from Rocky Howard     7/21/2016

Recent progress report from Parametrix has been uploaded to library.  See progress report here.

Based on initial modelling, it appears the groins conceptualized for this project may not have as great an effective as intended.  This is due in part to the way the river is migrating outside of the immediate project area.  Other alternatives could be explored that might generate greater protection for the WWTP.

There are three methods that could be considered to slow or eliminate the threat of lateral migration of the Wynoochee River towards the east that involve either “resistance” or “flow training”:
1. Hardening the east bank of the Wynoochee River upstream of the WWTP,
2. Place pile structures around the bend of the river that would accumulate wood and form a “natural” hardening of the bank and direct flow towards the river’s center, and
3. Encouraging the Wynoochee River to take a course further towards the west.

Projects Committee will work with Montesano on scope and timing of next steps.