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Farmers needed for flood impact survey

On behalf of the King County Flood Control District, King County is seeking input from farmers in the Lower Snoqualmie Valley about how flooding impacts their agricultural operations. The goal is to increase understanding of specific flooding and erosion risks, especially related to agricultural buildings and farm fields as part of the long-term Lower Snoqualmie Valley Residential and Agricultural Flood Mitigation Project.

There are several ways farmers can participate in this survey.

  1. Drop by the Carnation Library:
    Wednesday, May 14, 2014
    2 - 7 p.m.
    Carnation Library
    4804 Tolt Avenue, Carnation
    King County staff will be administering the survey on a first-come-first-served basis or you can call ahead for a reserved time slot. Plan to spend about 30-45 minutes.
  2. Click here to take survey (external link).
  3. Make arrangements to take the survey at your convenience either in person or by phone by contacting the King County project manager Richelle Rose.

(Alternate formats and interpreter and translation services are available by request. TTY relay: 711.)

Project overview

The Lower Snoqualmie Valley Residential and Agricultural Flood Mitigation Project, was initiated in 2010 to implement non-structural flood mitigation activities in an effort to reduce flood and erosion risks from the bottom of Snoqualmie Falls to the King-Snohomish county line.

Cursory analysis shows 574 structures in the Lower Snoqualmie Valley are at risk in a 100-year flood event.

Many high priority flood mitigation actions are underway. Since 2010, nine homes and two barns have been elevated; six properties have been acquired; and one elevated platform and 26 farm pads have been constructed as part of this project.

The project will continue to implement non-structural actions in the Lower Snoqualmie Valley floodplain.

Because levees and revetments in the Lower Snoqualmie Valley do not contain flood waters, non-structural actions such as elevations and buyouts are an essential part of the mitigation strategy.

Criteria addressing the urgency and severity of flood and erosion risks have been used to determine which actions to fund during the past several years. A more accurate understanding of risks, (similar to the Upper Snoqualmie Valley Residential Mitigation Program), will aid in a fair and consistent long-term mitigation strategy and highlight high priority risk areas.

Project goal

The goal of this long-term project is to protect agricultural and residential landowners, their homes and their farms, from flooding and erosion impacts in a way that does not compromise flood protection for neighboring landowners.


Homes, agriculture, businesses, and public and private infrastructure throughout the Lower Snoqualmie Valley floodplain are at risk of flooding and erosion.

In segments influenced by the Tolt and Raging Rivers, there are greater flood risks associated with channel migration and fast, erosive flows. Because the valley is flat and wide, rivers flow deep and fast, even during moderate flood flows. Six major floods have occurred since 1990 that have caused significant damage and disruption to agriculture, businesses and residences.

Additional resources

Snoqualmie Fish, Farm & Flood Advisory Committee

For more information about the Lower Snoqualmie Residential and Agricultural Flood Mitigation Project please contact Chrys Bertolotto, Project Manager, King County River and Floodplain Management Section.