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Just at its lower lip Farwell began to drive piles at an angle upstream. He sank brush with hundreds of bags of sand, made cribwork filled with whatever rubbish came to his hand, and soon he had the makings of a temporary dam, rude, but effective.
On examination of the piers of the bridge, it was found that they had admirably resisted the tremendous pressure; and though the timber “cribwork” erected to facilitate the placing of floating pontoons to form the dams, was found considerably disturbed and in some places seriously damaged, the piers, with the exception of one or two heavy stone blocks, which were still unfinished, escaped uninjured.
It would seem that for many highway bridges of short span, causeways, and similar structures, the use of similar caissons would prove economical and permanent, and that they might be used very largely to the exclusion of cribwork, which, after a decade or so, becomes a source of constant maintenance charges, besides never presenting an attractive appearance.
Along the entire length of the shed, and on the opposite side of the track, a timber trestle is erected, strong timber beams are laid from the top of the cribwork to the top of the trestle, 4 feet apart and at an angle representing the slope of the mountain, as nearly as possible.
The interior of the well is reached by a spiral stairway built in the wall, and commencing in the boiler house. In this way the engineer is able to reach the pump. It is a fact worthy of notice in connection with the construction of the wall, or rather the sinking of it, that the outer wall rests upon four feet of wooden cribwork, two feet thick, and having an iron shield.
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