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Answer to how Dry Dock #1 could accommodate DD's longer than 357-ft
|By the late 1930s, the dock was seen as too small for modern destroyers. As an interim measure to allow larger destroyers to be docked, the timber slide at the center of the dock's head was cut back in 1941 to create a notch for a ship's bow. Further work on the dock would have to wait until the end of hostilities because of its heavy usage for repair of battle-damaged vessels.
Combined with the need to extend the dock was its need for major repairs. As early as 1944, inspections revealed that some of the granite blocks on the side walls had bulged outward by as much as 4 in. This need for rebuilding, combined with the necessity of modifications to accommodate larger ships, led to one of the yard's first postwar modernization projects. This time, the extension was seaward by 40 ft., giving the dock its current length of 415 ft. A upper four altars of about half the length of the dock's side walls were taken down and replaced with concrete replicating the original form. This work, performed by Coleman Bros., started in the summer of 1947 and took approximately a year to complete.
A pretty good history of Dry Dock # 1 ... https://archive.hnsa.org/conf2004/papers/carlson.htm
I finally found an on-line history of Drydock #1;
Over the course of its history Dry Dock 1 has been enlarged several times. In 1833, the dock was 341′; in 1858-60 the dock was extended to 357’; the final extension occurred in 1947- 48, when the dock became 415’ in overall length, the size that it is today.
This cropped view of the two major drydocks and marine railway at the old Charlestown Navy Yard section of Boston Navy Yard, shows a GEARING (being delivered from BIW by then) in Drydock #1.
I don't know when they added the extension, but it was done at least during WWII. I don't have any scanned overhead images of BosNY prior to 1945. I have seen overhead photos prior to 1945, but the quality was poor and I decided not to scan them. The USN planned "facilities" upgrades for new classes of ships. Drydock #1 was only able to accommodate smaller ships in any case (no cruisers). The South BosNY drydocks was the go to place for the larger units.
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