Charlestown Navy Yard, Boston, MA
Dry Dock No. 1

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Dry Dock No. 1, originally constructed in the early 1830s, is a smaller size dry dock currently used for docking the USS CONSTITUTION for maintenance and repair. The dock is considered a sister dock to that of Dry Dock No. 1 located in Norfolk, Virginia.

In 2013, HEGER was part of a teaming arrangement hired to modernize and improve the facility which included designing and building a replacement caisson gate.

As part of the project, HEGER was responsible for naval architecture aspects of the new steel floating gate design including stability and draft requirements. HEGER assisted in the development of projects drawings, calculations, and specification.

The new gate was constructed by STEEL AMERICAN in Norfolk, Virginia and delivered to Boston, Massachusetts where it continues to operate successfully.

Further information at the USS Constitution Museum.

Caisson Gates Under Construction. Norfolk Naval Shipyard DD#1 - Replacement Caisson Gate for Charlestown Naval Shipyard Dock #1
Figure 1 – Caisson Under Construction (DD#1 caisson on right)
Charlestown Caisson Gate installed in Basin Dock Entrance
Figure 2 – Caisson Gate Installed in Basin Dock Entrance
Charlestown Navy Yard - - View of Basin Dock with Gate Installed at Entrance
Figure 3 – View of Basin Dock with Gate Installed at Entrance
Norfolk Naval Shipyard, Portsmouth, VA
Dry Dock No. 1
Portsmouth Naval Shipyard, Kittery, ME
Dry Dock No. 1 Expansion