NAVIGATION ON THE YANGTSE
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than a hundred feet above the river. The cliffs in Windbox Gorge rise to over 700 feet above the river, and it was here that in the record year the river level rose 275 feet in a short time.
In 1917, after there had been regular services operating on the river for some years, the Chinese Maritime Customs issued a series of recommendations for steamers intending to ply on the Upper River, based on the experience gained over these years. The maximum size for steamers intending to run all year round was 210 feet long by 31 feet beam and 94 feet draft, with a minimum speed of 12 knots. If they were intended to negotiate the main rapids under their own power, a speed considerably in excess of 12 knots was recommended. It was also recommended that the hull be divided into watertight compartments, and that ships should have a flat bottom. Ships over 130 feet long were recommended to have twin screws and two boilers, and if their beam was over 22 feet three rudders; all others having two rudders. Other recommendations and regulations related to steering gears, windlasses, and capstans, and illustrate the peculiar problems posed by navigation on the Upper Yangtse. By 1931 there were over a dozen special-type ships on the Upper Yangtse, half of them British, running regularly between Ichang and Chungking. Three of the others were Chinese, two American, and one French. There were also several small oil tankers. Above Chungking there were about two dozen smaller motor launches running, but in this part of the river a great part of the traffic was still handled by native craft of various types. In 1931 the American West China Shipping Company's last ship was wrecked in the Upper River, and the Dollar Company sold their last ship, the Alice Dollar, to the China Navigation Company, who renamed her the Wantung. This left British steamers predominant on the Upper River for the short time after that it remained open to foreign trade.
All ships operating on the Yangtse required pilots. On the Lower River these were mostly foreigners of the various countries which formed the Woosung-Hankow Pilots' Association. This was not a branch of the Chinese Maritime Customs, although these pilots were licensed and recognised by the Customs. On the coast and on other rivers, the Chinese Pilotage Service, which was a branch of the Customs, was the recognised authority. There was no official body of pilots on the Middle River, but there was