Harlan Ingersoll Smith,
The Archaeology of the Yakima Valley
“ North Yakima is on the western side of the Yakima River, about two miles below the mouth of the Naches, which empties into the Yakima from the west, immediately below where the latter breaks through Yakima Ridge. This break is called the Gap or the Upper Gap. North Yakima is at an altitude of 1067 feet above the sea level. The soil of the valley is made up of a rich volcanic ash and the region is arid and practically treeless except on the banks of the rivers and creeks or where irrigation has been successfully practised. ”
