Washington State Department of Transportation

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The Washington State Department of Transportation, also known as WSDOT, is governed by Washington State. The department is responsible for operating and improving transportation systems. It handles stormwater treatment, fish passage barrier removal, wetland replacement, and construction site erosion and air pollution control projects. The Washington State Department of Transportation manages an aerial photography branch that acquires aerial images on film negatives. The department also manages an aviation division that protects and preserves more than 135 general aviation airports. In addition, it offers services for over 3,000 vehicular bridges. The department obtains and manages architectural and engineering contracts for design and construction projects.