The ecoregion includes the mainstem Columbia north of the Snake River and tributaries such as the Yakima, Okanagan, Pend Oreille, Clark Fork, and Kootenay Rivers.

Early season hop growth in a hop yard in the Yakima River Valley of Washington ( U. S. state ) | Washington with Mount Adams ( Washington ) | Mount Adams in the distance

The Yakima River is a tributary of the Columbia River in south central and eastern Washington State, named for the indigenous Yakama people.

The river flows through that town, skirts Ellensburg, passes the city of Yakima, and continues southeast to Richland, where it flows into the Columbia River at an elevation of.

The Yakima River is ranked between Class I and Class II rapids, depending on the circumstances and season.

The Yakima River south of Union Gap, Washington | Union Gap

The Yakima River Basin consists of approximately located in south central Washington State.

The Yakima River provides irrigation for the dry but fertile land in the valley, and irrigated agriculture is the economic base.

The Yakima River and its tributaries have been heavily altered for the purpose of irrigated agriculture.

As a result, discharge statistics for the Yakima River are heavily affected by the irrigation system.

The USGS operates four streamflow gauges on the Yakima River.

de: Yakima River

* Yakima River

* Yakima River

In 2002, the Benton City – Kiona Bridge over the Yakima River at Benton City was added to the National Register of Historic Places.

The Yakima River canyon near the town of Thorp.

The town site of Thorp is above the flood plain of the upper Yakima River at an elevation of 1, 637 feet ( 499 m ).

It is situated near the river's west bank directly opposite the Hayward Hill slide area and Clark Flats, near the southeastern approach to the Yakima River canyon at the foot of Thorp Prairie.

North and northeast of the town of Thorp along the Yakima River channel is the gradual upward lift of the Thorp Drift, marked by an elevation change due to the incline onto the terminal moraine that marks the furthest advance of the Thorp Glacial stage.

Northwest of the town site of Thorp at the junction of SR 10 and Thorp Highway, the Yakima River emerges from the river canyon parallel to a basalt flow, the uppermost layers of which have been dated to 10. 5 million years.

About 7 miles west of Thorp, the first glimpses of the Columbia River Plateau are seen where the Yakima River has cut into the westernmost edge of the basalt plateau.

At the bottom of the Thorp Drift moraine the view opens up into the Kittitas Valley which is deeply buried in river gravel deposited by the ancient Yakima River.

The dividing line between these northern and southern sections is the confluence of the Naches and Yakima Rivers.

It is the location of the Yakima Valley AVA, a designated American Viticultural Area.

With more than 160 wineries within an hour ’ s drive, the Tri-Cities of Kennewick, Pasco, and Richland is truly at the heart of the Columbia Valley which includes the Yakima Valley, Walla Walla Valley, Red Mountain, Horse Heaven Hills, and Wahluke Slope appellations ( areas with a distinctive growing climate that influences wine production ).

The Tri-Cities is part of the Yakima television market.

The name " Three Rivers " has recently come to be used more for the area ( from the Columbia, Snake, and Yakima rivers ), yet is rarely mentioned beyond professional settings.

Yakima County is the second largest county by area in the U. S. state of Washington.

The county seat is Yakima, which is also its largest city.

Yakima County is the second largest county in Washington by area.

Yakima County is also widely known for being one of the most difficult places on earth to predict weather, because of the mountains that surround it.

Located within the larger Columbia Valley AVA, the Yakima Valley AVA is sub-divided into the three smaller wine regions, each with its own distinctive growing conditions.

It is significantly more Republican than the counties it borders, with the possible exception of Yakima County.

A third possibility is that the town was named for a Palouse tribal chief and signer of the Yakima Treaty of 1855.

Among the earliest records of Native American interaction with frontiersmen in the Kittitas Valley took place in 1858, the summer of the Yakima War, when a large contingency of Wanapum from Priest Rapids camped at the head of Taneum Canyon very close to where the town of Thorp is now located.

Fielden Mortimer ( F. M .) Thorp is recognized as the first white settler in the Yakima Valley, prior to his subsequent move to the pleasant surroundings of the present-day town of Thorp.

Utilizing water diverted from the Yakima River, it is about 14 miles long and averages 12 feet wide.

Additional training space is available at the Yakima Training Center in eastern Washington, including maneuver areas and additional live fire ranges.

Yakima Pass was also used by the Hudson's Bay Company.

The train was combined with the Amtrak Empire Builder between Chicago and Minneapolis and between Spokane and Seattle ( at the time the Empire Builder used the former North Coast Limited route between Spokane and Seattle, via Yakima ) and operated three days per week.

It is primarily used for baseball, and is the home field of the Yakima Bears minor league baseball team.