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Timeline: 1921 - 1940 |
- The State Highway Board is replaced by the State Highway Committee (comprising the Governor, State Auditor, and State Treasurer) in 1921 and a Division of Highways is created in a new Department of Public Works, under the direction of Supervisor of Highways James Allen.
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- Washington levies its first gasoline tax, one cent per gallon, to raise $900,000 annually, in March 1921.
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- First State Highways Testing Laboratory (now the WSDOT Materials Laboratory) is established in Olympia in July 1921.
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- Legislature removes highways from the Department of Public Works and establishes the position of State Highway Engineer (first filled by James Allen) in 1923.
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- State installs its first standard-dimension steel truss bridge over the Dosewallips River in August 1923.
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- Final 36-mile stretch of Pacific Highway is paved between Kalama and Toledo to complete State Road No. 1 (now SR 99) in October 1923.
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- J. W. Hoover succeeds Allen as State Highway Engineer on April 1, 1925.
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- Present boundaries of six State Highway Regions are established in 1925 (a temporary seventh district directed central Puget Sound Interstate construction between 1957 and 1975).
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- Samuel J. Humes becomes Highway Engineer on May 1, 1927.
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- First Vantage Bridge over the Columbia River opens on September 8, 1927 (replaced in 1962).
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- Department of Highways becomes a separate code department on March 14, 1929. Samuel Humes is named first Director of Highways.
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- Olympic Loop Highway (U.S. 101) opens August 26–27, 1931.
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- George Washington Memorial Bridge (Aurora Bridge) opens on February 22, 1932.
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- Legislature approves $10 million in emergency relief bonds for public roadwork, funded in part from the gas tax, in February 1933. This is the first bonded debt issued by the State for roads.
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- Lacey V. Murrow becomes Director of Highways on March 20, 1933.
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- Highway Department establishes the first truck weighing stations in 1933, and occupies a new Olympia headquarters in 1934.
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- Deception Pass and Canoe Pass bridges open between Whidbey Island and Fidalgo Island in July 1935.
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- Legislature approves sweeping new highway code, raises speed limit to 50 m.p.h., and creates new Toll Bridge Authority within the Department of Highways in March 1937.
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- Final paving opens four lanes to traffic on Pacific Highway (SR 99) from Olympia to Everett on September 15, 1937.
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- Tacoma Narrows Bridge opens on July 1, 1940, and Mercer Island (Lake Washington) Floating Bridge (now Lacey V. Murrow Floating Bridge) opens the next day.
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- James A. Davis becomes acting Director of Highways in September 1940, after the U.S. Army calls Lacey Murrow to active duty.
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