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State of Washington

Washington Department of Transportation

Geotextiles & DOT Specifications

JAN 2020


Washington DOT does not follow AASHTO and has developed their own specifications (although it appears their specs may be somewhat informed by AASHTO M 288). Their property tables for AOS and Water Permittivity differ from AASHTO M 288.

Unlike AASHTO, they describe AOS requirement as "NO. (#) max". This can lead to confusion. Do they want a product with a Standard Sieve number no greater than the number listed, or do they want a particle size no greater than the size associated with that sieve number? We are reading the spec as the size associated with the sieve number.

They also use "survivability" terminology no longer used by AASHTO. The various product categories are named differently as well.

The specification for "Geotextile Properties for Retaining Wall & Reinforced Slopes" is very confusing. The Washington DOT Qualified Products List for this specification list geogrids, which would make sense for this application. However the specification clearly allows for a woven and nonwoven geotextile. Perhaps these are to be used as facing wraps? Please be careful here. 

Below are US Fabric's geotextile products that meet the Washington DOT geotextile specification, listed by their application.

Click on the green product name for a data sheet.

US Fabrics Products Meeting Washington's DOT Specifications
Specification Application Non Woven Woven Composite Grid
9-33.2 Table 1 & 2Underground Drainage (Low Survivability)    
Class AUS 120NWUS 230  
Class BUS 120NWUS 230  
Class C    
9-33.2 Table 1 & 2Underground Drainage (Moderate Survivability)    
Class AUS 160NWUS 230  
Class BUS 160NWUS 230  
Class C    
9-33.2 Table 3Separation US 160NWUS 250  
9-33.2 Table 3Soil StabilizationUS 205NW   
9-33.2 Table 4 & 5Permanent Erosion Control (Moderate Surv) Class AUS 160NWUS 230C  
9-33.2 Table 4 & 5Permanent Erosion Control (Moderate Surv) Class B, CUS 160NW   
9-33.2 Table 4 & 5Permanent Erosion Control (High Surv) Class AUS 205NWUS 230C  
9-33.2 Table 4 & 5Permanent Erosion Control (High Surv) Class B, CUS 205NW   
9-33.2 Table 4Ditch LiningUS 160NWUS 250  
9-33.2 Table 7Retaining Walls & Slopes (Geotextile Reinforcement)US 120NWUS 200  
9-33.2 Table 7Retaining Walls & Slopes   SG150
9-33.2 Table 7Retaining Walls & Slopes   SG200
9-33.2 Table 7Retaining Walls & Slopes   SG350
9-33.2 Table 7Retaining Walls & Slopes   SG500
9-33.2 Table 7Retaining Walls & Slopes   SG550
9-33.2 Table 7Retaining Walls & Slopes   
9-33.2 Table 7Retaining Walls & Slopes   SG700
More resources may be found on the web:

Washington DOT Home Page

2020 Standard Specifications for Road, Bridge, and Municipal Construction - 9-33 Construction Geosynthetic

State QPL information:

Qualified Product List

  • US Fabrics' Products (With the exception of Strata Geogrids) are not currently listed on the WSDOT QPL.
  • The above information is to be used only as a guide.
  • Please verify the meaning of "max AOS" as understood by the project engineer.
  • Products on the above list can change without notice.
Areas Served:

US Fabrics is proud to serve the geotextile needs of the State of Washington, including: Seattle, Spokane, Tacoma, Vancouver, Bellevue, Everett, Kent, Yakima, Renton, Spokane Valley, Federal Way, Bellingham, Kennewick, Auburn, Marysville, Pasco, Lakewood, Redmond, Shoreline, Kirkland, Richland, Olympia, Sammamish, Lacey, Edmonds, Bremerton, Puyallup, Longview, Lynnwood, Bothell, Burien, Wenatchee, Mount Vernon, Walla Walla, University Place, Issaquah, Pullman, Des Moines, Lake Stevens, SeaTac, Bainbridge Island, Mercer Island, Maple Valley, Oak Harbor, Kenmore, Moses Lake, Mukilteo, Mountlake Terrace, Camas, Tukwila, Port Angeles, Mill Creek, Ellensburg, Arlington, Covington, Battle Ground, Bonney Lake, Tumwater, Monroe and all other areas of Washington.