Although early loggers focused principally on harvesting big fir and hemlock timber for use in construction applications, other more specialized markets also developed during this period. Spruce found it's market niche for use in building aircraft and cedar for making shakes and shingles. And if you had access to water transport, there was always a market for cordwood. The benefit here was that cordwood could be made from "waste" timber and cost virtually nothing. The downside, however, was how to get all this small wood to market economically. One answer - build a flume.
Image courtesy VanNatta Logging History, circa 1890's
The above flume is reported to have been built just for transport of cordwood from the woods to portside, where it was loaded on barges and towed to population centers for sale. Apparently the flume was built with a catwalk all along the way to make it easy to break up jams and keep the cordwood moving.