Lower White River Countyline Levee Setback project
This project is one of two projects in this reach. The other is the Right Bank Levee Setback project.
SEPA Comment Period: Oct. 9-23, 2012 - The State Environmental Policy Act (SEPA) public comment period is open. The Determination of Non-Significance, SEPA Environmental Checklist, and supporting documentation are provided below. Send comments on the Environmental Checklist to Sarah McCarthy, Project Ecologist, by October 23, 2012.
The Countyline Levee Setback project is between 30% and 60% design completion. Send comments on the safety checklist and design plan to Chris Brummer, Senior Engineer, River and Floodplain Management Section.
Significant flooding in January 2009 flooded the cities of Pacific and Sumner, and overtopped Eighth Street East. The goal of the project is to reduce flood elevations by increasing flood conveyance and storage capacity in the reach. The proposed project is a combination of property acquisition, levee modification and floodplain restoration along the left bank looking downstream of the lower White River between the A-Street Southeast and Eighth Street East bridges in the cities of Pacific and Sumner.
Specific project elements include:
- Acquire nearly 50 remaining acres of floodplain and associated wetland buffer in the project area;
- Construct a 6,000 lineal foot raised setback levee along the landward edge of a forested buffer to protect existing properties and structures;
- Construct 5,000 lineal feet of bio-engineered bank revetment along the existing wetland edge to protect existing properties and structures;
- Restore a forested riparian buffer (approximately 11 acres) adjacent to the wetland;
- Install engineered log structures in the existing wetland complex; and
- Remove approximately 4,000 lineal feet of levee and bank armoring.
Flood levels will be reduced by removing the existing levee constriction, while the extent of overbank flooding and damages to nearby communities will also be reduced.
Click the below image to enlarge the project's draft conceptual design.
Proposed timeline: Updated October 2012
- Oct.-Nov. 2012: Prepare permit-ready design, plans, specifications and permit applications
- 1st quarter 2013: Acquire all land rights and execute funding agreements
- 2014-2015: Construction
Project costs and sponsors
The total construction costs are estimated at 11.3 million, based on 40 percent of the project design being completed. Funding for the project is broken down as follows:
- $5.2 million - King County Flood Control District Capital Program
- $823,000 - State Salmon Recovery Funding Board grant (secured)
- $500,000 - Pierce County REET funding (expected)
- $4.775 million - Natural Resource Damage Assessment participants (expected)
The King County River and Floodplain Management Section is overseeing the design and construction of this project which is being implemented on behalf of the King County Flood Control District (external link).
SEPA Review Period: Oct. 9-23, 2012
The State Environmental Policy Act (SEPA) (external link) public comment period is open. The Determination of Non-Significance, SEPA Environmental Checklist, and supporting documentation are linked below. Send comments on the Environmental Checklist to Sarah McCarthy, Project Ecologist, by October 23, 2012.
The Countyline Levee Setback Project documents are available in Acrobat format.
- USGS Channel Capacity and Sediment Transport Report (Czuba et al. 2010 - 14.3 MB, PDF)
- Summary of Sediment Trends (Herrera 2010 - 10.4 MB, PDF)
- Hydraulic Modeling Approach and Initial Results (Herrera 2012a - 2.96 MB, PDF)
- Floodplain Geomorphic Surface Development Approach (Herrera 2012b - 4.26 MB, PDF)
- Draft Geomorphic Assessment (Herrera 2012c - 5.59 MB, PDF)
- Wood Budget (Latterell 2011 - 5.11 MB, PDF)
- Large Wood Safety Checklist (King County 2011, 642 KB, PDF)
- Geotechnical Investigation (King County 2012a) - 3.05 MB, PDF)
- Draft Wetland Delineation Report (King County 2012b - 6.84 MB, PDF)
- Draft Countyline Reach Monitoring Plan (King County 2012c - 831 KB, PDF)
- Draft Lower White River 2011 Sediment Monitoring Summary (King County 2012d, 2.2 MB, PDF)
- Draft Evaluation of Gravel Removal in the Lower White River, 2011 (King County 2012e, 3.22 MB, PDF)
- 30% Design Alternatives Analysis (King County 2012f, 15 MB, PDF)
External links to related information
For more information about the White River, contact Jeanne Stypula, White River Basin Supervisor, King County River and Floodplain Management Section.