It flows generally northwest from headwaters in the Blue Mountains of southeastern Washington to meet the Snake 4 miles (6 km) upstream from Lyons Ferry Park and the mouth of the Palouse River.

The Washington Department of Ecology named the Tucannon basin a Watershed Resource Inventory Area (WRIA) and in 1995 began hearings about how to allocate the water.

On their return trip to St. Louis on May 2, 1806, Lewis and Clark followed the Nez Perce Trail, crossing over from Patit Creek about 2.5 miles (4.0 km) east of present-day Dayton to meet the Tucannon.

Its bed is pebbled... (I)n its narrow bottoms are found some cottonwood, willow and the underbrush which grows equally on the east branch of the Wollawollah [Touchet].

[12]Lewis and Clark camped on the Pataha Creek (a tributary to the Tucannon), which is recorded as the first locality for some distance where they were able to find ample firewood.

In the late winter of 1834, Captain Benjamin Bonneville crossed the Tucannon on the Nez Perce Trail, surveying the Northwest on behalf of the United States government.

The expedition started about the 10th of March, 1848, and after a search of ten days or so found the enemy encamped on the Tucannon River, about four miles above its confluence with the Snake.

The troops, greatly outnumbered, fought on the defensive, marching in retreat, formed in a hollow square, to resist the assaults made on all sides.

He selected the mouth of Tucannon River to establish Fort Taylor (a supply depot which honored Captain Oliver H. P. Taylor—killed that same year while he served with Lt.

Peak output from the project, bought by Puget Sound Energy and transmitted by the Bonneville Power Administration, is 150 megawatts (MW).

Rainbow, Deer, Blue, Spring, Curl, Beaver, Watson and fly fishing-only Big Four Lake make up these trout-catching opportunities.

Activities include hiking, canoeing on Donnie Lake, swimming in an indoor pool, archery, softball, tennis, and basketball.