Bert Loper

Loper left Russell and Monett in Glen Canyon on November 1, 1907, to repair a camera and was to rejoin the two other men at Lees Ferry not later than December 1.

Russell and Monett completed their river cruise through the Grand Canyon and arrived at Needles, California, on February 8, 1908, with one boat.

[2] In 1920, Loper acted as lead boatman on the USGS survey mission to find a suitable damsite in the Black Canyon, the future site of Hoover Dam.

Loper finally made his first boating run through the Grand Canyon in 1939 on a two-boat trip with Chester Klevin, Bill Gibson, and Don Harris.

River historian Otis "Dock" Marston speculated Loper, with his perilous heart condition, was most likely dead before the boat flipped.