King County Flood Control District Snoqualmie Basin Supervisor Engineer Chase Barton fields questions and input from residents during a meeting at the North Bend Library on Oct. 30. The Flood Control District is putting together a draft investments plan which will be done by next spring. Aaron Kunkler/staff photo

King County Flood Control District Snoqualmie Basin Supervisor Engineer Chase Barton fields questions and input from residents during a meeting at the North Bend Library on Oct. 30. The Flood Control District is putting together a draft investments plan which will be done by next spring. Aaron Kunkler/staff photo

King County considers how to invest in Snoqualmie River flood infrastructure

County representatives met in North Bend to talk with residents about an investment plan.

North Bend residents and county representatives met Oct. 30 to talk about flooding solutions for the valley.

The Snoqualmie River basin is prone to floods and has had multiple floods, including four major floods in the last four decades. These floods are known as 25-year flood events, meaning they have a 4-percent chance to happen in any given year. The most recent 25-year flood occurred in 2009 and caused millions in damage across the county. Many areas along the Snoqualmie in East King County were flooded.

The King County Flood Control District was formed in 2007 to find ways to reduce flood impacts and is currently soliciting local input for a capital investment strategy, said county engineer Chase Barton at the meeting.

“We want to hear from you, what the impacts are in your community,” he said.

The capital investments strategy will rank projects by need and feasibility in the area of the Middle Forks Snoqualmie River upstream of its intersection with the North Fork, outside of North Bend. Options include adding height to existing levees, adding wood to banks to protect them from erosion, rebuilding or replacing bridges and culverts, elevating structures above flood levels, repairing levees, dredging the river, setting levees further back from the river or removing levees to restore floodplains.

There are a number of levees already along the Snoqualmie near North Bend, but many were constructed during the 1960s and have steep banks set next to the river. The banks allow the water to erode beneath the levy, weakening them. The levees could be reinforced, removed or moved back to allow the river more leeway during floods.

The county is hoping to reduce risks from floods and channel migration, where the river naturally moves across the landscape due to erosion of the banks. It is additionally hoping to reduce long-term repetitive costs of floods, build sustainable flood management infrastructure and solicit community input in their plans. The Flood Control District will draft a plan this winter and return for public comment by next spring. These projects will include plans for floods as big as a 500-year event.

In addition to levee repairs, the Flood Control District has undertaken projects like reinforcing banks and elevating homes. Following the 2009 flood, the county received more than $2 million in federal emergency funding to elevate 22 homes near North Bend and Snoqualmie.

King County Executive Dow Constantine recently urged residents to prepare for flood season, which occurs between November and February. The county has experienced 12 federally declared floods since 1990. While records aren’t reliable from the time, Barton said a 1959 flood may have been close to a 100-year flood. Families in flood-prone areas should create kits including lights and batteries, a portable radio, non-perishable food, water and books and games.

As climate change continues unabated, the effects will be felt in King County largely through impacts to water. The rainy season will be wetter and the summers drier, meaning snowpack will be significantly reduced by mid-century, leading to more variation between summer and winter flows. Many rivers in the area will switch from being fed through a mixture of snow runoff and rainfall to primarily becoming dependent on rain. Rainfall during winter months will likely increase, which could affect the severity of floods in the region.

Other areas of Washington state are vulnerable to flooding as well, especially along the Chehalis River, which runs from the small mountain town of Pe Ell, through Thurston County before reaching the seaside cities of Aberdeen and Hoquiam. A massive 2007 flood submerged the cities of Centralia and Chehalis as well as a portion of Interstate 5, a critical highway which runs from the Canadian border through Oregon and California to the Mexican border.

More in News

Eastside tech companies Smartsheet, OfferUp, Apptio face challenging 2019

Here are a handful of companies from the Eastside that will be interesting to watch in 2019.

Attendees gather after the Dec. 21, 2018, meeting at Seattle’s Daybreak Star Indian Cultural Center. Photo by Melissa Hellmann
Washington indigenous communities push for action to address violence against women

A new law seeks to strength data collection on missing and murdered indigenous women.

Exit poll indicates Washington voters still support climate change action

State environmental organizations’ poll points to continuing support for carbon-reducing measures.

CenturyLink 911 outage investigations underway; AG seeks comment from locals

CenturyLink could be hit with both FCC and UTC fines.

Josh Tuininga of North Bend sketches in his converted vintage Bluebird school bus art studio. Photo courtesy of Josh Tuininga
Local man releases new graphic bedtime story

Josh Tuininga of North Bend has completed his first graphic bedtime story, “Dream On.”

From left, director of local services John Taylor welcomes Danielle de Clercq as deputy director and Jim Chan as director of the permitting division. Photo courtesy of King County Local Services
King County’s Department of Local Services begins operations

Unincorporated King County rang in the new year with its own department

Attorney General Bob Ferguson visited the Reporter’s office. Carrie Rodriguez/staff photo
Northshore area lawmakers sponsor attorney general bills

The bills focus on gun control, consumer protection and raising vape and tobacco product age limits.

Mount Si Artist Guild’s Open Studio program begins 2019 with new plans

The Mount Si Artist Guild’s Open Studio is beginning it’s fourth year of operation new plans.

From left: Maximo Jimenez, Cameron McCrea, Rowen Higgins and Ivan Dyshlevich. Joe Dockery’s digital media class create and sell coffee mugs and sleeves to support the school’s suicide prevention program. Madison Miller/staff photo
Mount Si High School students caffeinate for a cause

MSHS students design, manufacture and sell coffee mugs and sleeves for suicide prevention program.

Most Read