Yakima River

Columbia River Basalt Group

There is no single entry for the entire Yakima river. The first way definition is at https://www.openstreetmap.org/way/319057418 and from there you can query your way downstream until reaching the Columbia River. To query, zoom into a region of the map (such as a river segment) and then right-click and select Query features.

Saddle Mountains (Wikipedia) The Saddle Mountains consists of an upfolded anticline ridge of basalt in Grant County of central Washington state. The ridge, reaching to 2,700 feet, terminates in the east south of Othello, Washington near the foot of the Drumheller Channels. It continues to the west where it is broken at Sentinel Gap (a water gap through which the Columbia River passes) before ending in the foothills of the Cascade Mountains.

Yakima River (Wikipedia) The Yakima River is a tributary of the Columbia River in south central and eastern Washington state, named for the indigenous Yakama people. Lewis and Clark mention in their journals that the Chin-nâm pam (or the Lower Snake River Chamnapam Nation) called the river Tâpe têtt (also rendered Tapteete), possibly from the French tape-tête, meaning “head hit”. The length of the river from headwaters to mouth is 214 miles (344 km), with an average drop of 9.85 feet per mile (1.866 m/km). It is the longest river entirely in Washington state.