In 1917, the Utah Power and Light Company floated their own men down the river to search for suitable sites for hydro-electric dams.

Head boatman for the trip was Bert Loper, a seasoned runner on the Colorado River. The other boatmen, who also served as rodmen for the servey, were E.B. Lunt and H.E. Blake. Additional men survey as cooks, helpers, and engineers completed the crew.

The party launched on July 22nd, 1922; again with tales of disaster from the townspeople. The group floated to Green River, Utah, located 14 potential damsites and thoroughly mapped the canyons of the upper Green River

Though still untamed, the “Great Unknown” of the Green River was reduced to lines on maps.