In early April 1906, Frank J. Smith, transportation manager for Mountain Gem, reported that the steamer's route had been extended to Kennewick and Pasco, Washington, both on the Columbia River, upstream from Wallula.
 These two towns had never before had steamboat service.
 Mountain Gem would also connect with the White Bluffs Transportation Company which ran to Priest Rapids on the upper Columbia.
 In October 1906, Mountain Gem was the largest steamboat on the upper Columbia, and carried wheat from Hover, Washington, to Celilo, a distance of 115 miles.

In late July 1908, Mountain Gem was temporarily aid up, and its business was consolidated with the steamer W.R. Todd, with the Todd alone left on the Kennewick-Priest Rapids route.
In early April 1906, Frank J. Smith, transportation manager for Mountain Gem, reported that the steamer's route had been extended to Kennewick and Pasco, Washington, both on the Columbia River, upstream from Wallula.  These two towns had never before had steamboat service.  Mountain Gem would also connect with the White Bluffs Transportation Company which ran to Priest Rapids on the upper Columbia.  In October 1906, Mountain Gem was the largest steamboat on the upper Columbia, and carried wheat from Hover, Washington, to Celilo, a distance of 115 miles.
In late July 1908, Mountain Gem was temporarily aid up, and its business was consolidated with the steamer W.R. Todd, with the Todd alone left on the Kennewick-Priest Rapids route.
Mountain Gem (sternwheeler)