July 14, 2020

Willowmoor Floodplain Restoration Project – Dynamic Weir Analysis
This is a follow-up to a memo Reid Brockway sent to the Executive Committee dated March 8, 2019, concerning a key problem – extreme flooding of Lake Sammamish in peak inflow events – that the Willowmoor-sponsored Preliminary Dynamic Weir Analysis Technical Memorandum (DWA) did not adequately address.

Memo to FCD – DWA addendum critique

May 25, 2020

WSSA Video Review of Lake Sammamish Flooding 2020

This 20-minute video presentation provides background facts and factors surrounding Lake Sammamish’s mismanaged water levels and repeated flooding of shoreline properties.

2020 Flooding Survey

March 8

This is to highlight what I believe to be the most pressing issue concerning the Sammamish River flood control and the Willowmoor project.  It is a problem with a solution, achievable with active flow control via a dynamic weir.

Memo to FCD – DWA critique

February 2020

Damage Photos, Letters of Concern,
Citizen Petition, Estimated Damages

2020 Lake Sammamish Flooding Document Download

Inspection Report on Authorized Project

Sammamish River, King County, Washington

Flood Control Project July 8 2008

PDF Document

Submission to KC Flood Control District Appeal

Comparison of County Prel. Weir Analysis Lake Level History to an Independent Analysis 2018

Submission of Water Level Issue Photos 10_2018

Statistical Analysis of Lake Samm. Historic Water Levels

King County explains the Willowmoor Project – Asks for Your Input – 2015 Creek

Inspection Report on Authorized Project 2008

Sammamish River, King County, Washington

July 8th 2008

PDF Document

Submisson To KC Willowmoor Project 10_2018

King County’s flood risk reduction and habitat restoration projects sometimes require the placement of large wood into rivers and streams. Large wood can slow down a river, create pools and hiding places for young salmon, and bolster levees or revetments that protect people and infrastructure from flood risks. If you would like to learn about King County projects that involve the placement of large wood, please join us for a conversation about our current projects.

• 3-5 p.m. Tuesday, June 12, Issaquah Fish Hatchery, 125 W. Sunset Way Issaquah
• 6-8 p.m. Wednesday, June 13, Riverbend Club House, 17410 S.E. Renton-Maple Valley Road, Renton.

Some of the projects to be presented are:

• Cedar River: Riverbend Floodplain Restoration Project, Taylor Creek Mitigation Project
• Green River: Lones Levee Setback Project
• Snoqualmie River: Shake Mill Left Bank Repair Project, Si View Levee Repair Project, Lower Bendigo Right Bank Repair Project
• Tolt River: Remlinger Levee Repair Project, San Souci Floodplain Restoration Project, Lower Tolt 2018 Adaptive Management Project
• White River: Middle Boise Creek Van Wieringen Stream Restoration Project, Boise Creek-Evans Adaptive Management Plan

For more information, contact Laird O’Rollins.

Letter to Corps Feb 2017