Tieton Main Canal, also called Tieton Canal, Yakima-Tieton Irrigation Canal and Yakima Tieton Main Canal, is a long

irrigation canal Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface f ...

on the

Tieton River The Tieton River is a tributary of the Naches River, in Yakima County, Washington in the United States. The Tieton River begins in two forks, the North Fork Tieton River and South Fork Tieton River. The North Fork originates at McCall Glacier ...

in Washington state. It was cut by hand in 1906 with federal funding, one of the first canals created under the 1902 Reclamation Act, and opened in 1907. The canal was shut down for 19 days due to ash from the

1980 eruption of Mount St. Helens In March 1980, a series of volcanic explosions and pyroclastic flows began at Mount St. Helens in Skamania County, Washington, United States. A series of Phreatic eruption, phreatic blasts occurred from the summit and escalated until a major ...

and again during the Rimrock Retreat Fire in 2024. Two miles of the canal are through tunnels, including long North Fork Tunnel. The canal is managed by Yakima Tieton Irrigation District. As of the 2010s, the canal was "at risk of catastrophic failure" according to its owner, and in need of replacement, with a $200 million estimated cost for building a new canal.

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*{{Commons category inline, Tieton Main Canal 1907 establishments in Washington (state) Canals in Washington (state) Buildings and structures in Yakima County, Washington Canals opened in 1907 Geography of Washington (state)