Reginald H. Thomson

Reginald Heber Thomson (usually R.H. Thomson; 1856 – January 7, 1949) was a self-taught American civil engineer. He worked in Washington state, mainly in Seattle, where he became city engineer in 1892 and held the position for two decades. Alan J. Stein wrote that Thomson "probably did more than any other individual to change the face of Seattle" and was responsible for "virtually all of Seattle's infrastructure".

Despite the scope of his work, no major portion of Seattle's infrastructure has ever carried Thomson's name. He was supposed to have been memorialized by the R.H. Thomson Expressway, proposed in 1960 but never built.

Among his achievements were the railway route through Snoqualmie Pass, the Lake Washington Ship Canal, much of the paving of Seattle's roads and sidewalks, numerous bridges over rivers and valleys, and major improvements to Seattle's sewer system, as well as straightening and deepening the Duwamish River and developing the Cedar River watershed, now one of Seattle's major sources of drinking water. He was also responsible for much of the regrading of Seattle, taking down hills and filling in the mudflats, and played a major role in the creation of Seattle City Light (the public electric utility), the Port of Seattle, and the Hiram M. Chittenden Locks. Elsewhere, he consulted on projects such as the Rogue River Valley Irrigation Canal, water development for Bellingham, Washington, and power plants in Southeastern Alaska.

Born and raised in a "Scottish colony" in Hanover, Indiana, Thomson received three degrees from Hanover College: a Bachelors in 1877, a Master of Arts in 1901 and an honorary Ph.D., also in 1901. After his baccalaureate, he worked as a surveyor, then followed his father to Healdsburg Institute in Healdsburg, California, where his father served as principal and Thomson as a mathematics teacher.

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