Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Tenino was the second steamboat to run on the Columbia River above Celilo Falls and on the Snake River. Following a reconstruction or major salvage in 1876 this vessel was named the New Tenino. Tenino was built in 1860 by R.R. Thompson at the mouth of the Deschutes River on the upper Columbia River for the Oregon Steam Navigation Company ("OSN"), which by the time Tenino was built was becoming the most powerful transportation company in the American part of the Oregon Country. John Gates, the OSN principal engineer, supervised construction of Tenino and became her first engineer. The engines were new from the OSN shops.