This continued until about seventeen years ago, when it was decided to replace these locks by some of very much larger dimensions, and also to greatly reduce the number. With this object, locks were built at Dutton and Saltersford near the site of existing locks, and of sufficient height of walls to enable the two ponds above to be thrown into one, thus doing away with the four smaller locks. The same has been done at Hunts, and, more recently, at Valeroyal, above Northwich. The locks at Dutton and Saltersford are entirely built of masonry, having limestone sills and rubbling courses, with the intermediate part sandstone. All the work on the river is of this description, with the exception of the Hunts and Valeroyal large locks, which are built of concrete. When these improvements are completed there will be only four locks on the twenty miles of navigation, the larger of each pair of locks being 220 feet long, by 42 feet 6 inches wide, and having 15 feet of water on the sills. Most of the river is now dredged to 12 feet, there only being 10-feet bars at certain points. The ordinary width is about 95 to 100 feet at water level, and 45 feet at the bottom. More than a million tons of salt annually pass down the Weaver to the Mersey. THE TYNE. This noble river, from Newcastle to the sea, is one of the greatest triumphs of modern engineering. Good old Camden quaintly remarks, that “where the wall (Roman) and the Tine almost met together Newcastle sheweth itself gloriously, the very eye of all the townes in these parts, ennobled by a notable haven, which Tine maketh, being of that depth that it beareth very tall ships, and also defendeth them, that they can neither easily be tossed with tempests nor driven upon shallows and shelves.”[36]