Outline of Washington (state) infrastructure

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.

For earlier 19th century forts, see List of forts#Washington For a full list of Army airfields see Washington World War II Army Airfields.

Constructed canals only[b] Volcano-related infrastructure around Mount St. Helens related to its 1980 eruption and future eruptions Washington has more floating bridges than any other state,[9] and the world's three longest ones, including: Historically notable roads include

The location of the state of Washington in the United States of America
Grand Coulee Dam has long been emblematic of infrastructure in the State of Washington, and is one of two dams mentioned in the official state folk song, Roll On, Columbia, Roll On ". But its scale has been eclipsed by several 21st century infrastructure projects .
LIGO gravity wave observatory at Hanford, with legs two and a half miles long, is the largest project ever funded by the National Science Foundation. It is one of a pair of instruments used by the scientists awarded the 2017 Nobel Prize in Physics .
Center pivot irrigation in the Columbia Basin makes mile-wide circles around Potholes Reservoir , visible from space.
Many bridges are visible in this photograph of the northern Puget Sound area of Washington, including the four floating bridges listed
Brick paved section of Yellowstone Trail in Redmond