The following outline is provided as an overview of and topical guide to infrastructure of the U.S.
state of Washington.
This section lists a few of the largest infrastructure projects of each century since non-Indigenous settlement.
Initial settlement of the state
Early industrialization, Age of Rail
Rapid industrialization during World Wars, suburbanization of Seattle area
Washington is a major hydroelectric producer in the United States and the world. The Grand Coulee Dam on the Columbia River was the world's largest when built, and remains the largest power station in the United States by capacity.
For earlier 19th century forts, see List of forts#Washington
For a full list of Army airfields see Washington World War II Army Airfields. The Navy also civilianized several fields.
Constructed canals only
Volcano-related infrastructure around Mount St. Helens related to its 1980 eruption and future eruptions
Washington has more floating bridges than any other state, and the world's three longest ones, including:
Historically notable roads include
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