As rail competition grew, and forced steamboats off their old routes, shippers and steamboat lines began agitating Congress to allocate funds for improvements to the river, in the form of canals and locks, that would restore their competitive position relative to the railroads. The two main improvements sought on the Columbia were the Cascade Locks and, about twenty years later, the Celilo Canal and Locks. Studies for a canal at the Cascades had begun in 1875, but interest tapered off when Oregon Railroad and Navigation Company finished the railroad to The Dalles and took its boats off the middle river. Anti-monopoly shippers eventually got Congress to allocate funds in 1893 to begin the canal and locks at the Cascades, which were completed in November 1896. The locks had a lift chamber carved in solid rock long, and 90' wide, with of draft, deep enough for any vessel then on the river, and large enough to accommodate several at once. The locks could raise a vessel 14' at high water and 24' at low water. The lock gates were wide and high. The locks were carefully designed to address the great variation in the height of the river, the difference between high and low water being. This condition made it necessary to build a series of three sets of gates, increasing in height from the lower entrance to the huge upper guard gate, only two sets being used at one time. When the river was low, the upper guard gates remained open continually and the lower sets were operated. When the water rose enough to drown the lower gates, they were swung open and the lifting work was done by the others. The upper approach was formed by masonry wall extending from the guard gate in a long sweep of, and the bank behind was armored against floods with riprapped stone.
Effect on river traffic
In an 1897 article written shortly after their completion, Scientific American was optimistic about the future of the locks, saying: As it turns out, completion of the locks and the canal leading from the east end of the locks, produced some increase in traffic, but not as much increase in riverine traffic as had been hoped. The North Bank railroad was also completed along the Columbia, which took more business away from the boats. As a result, the Regulator Line, which had been running Dalles City, Regulator, and Bailey Gatzert on the lower Columbia, and, through the locks, on the middle Columbia, sold out to James J. Hill, owner of the Great Northern and other railroads. Not long later, in 1912, the Panama Canal Act made it illegal for a railroad to be owned in common with a competing steamboat line, so in 1915, Great Northern sold its boats.
