Puget Sound Bridge and Dredging Company Puget Sound Bridge and Dredging Company Puget Sound Bridge and Dredging Company was a major shipbuilding and construction company, located in Seattle, Washington. The firm was established in 1898 on Elliott Bay in Puget Sound. The company was engaged in construction projects around the United States and built ships for the U.S. Navy at its shipyard on Harbor Island on Puget Sound during and after World War II. In 1959 the firm was purchased by Lockheed and became the Lockheed Shipbuilding and Construction Company. The shipyard was permanently closed in 1987. During its 61-year history as Puget Sound Bridge and
Lake Washington is now the primary source of water for Lake Washington. In addition, there are numerous small creeks and rivers which feed the lake, including: Before construction of the Lake Washington Ship Canal in 1916, Lake Washington's outlet was the Black River, which joined the Duwamish River and emptied into Elliott Bay. When the canal was opened the level of the lake dropped nearly nine feet (2.7 m). The canal to the Puget Sound became the lake's sole outlet, causing the Black River to dry up and disappear. Concrete floating bridges are employed to span the lake because Lake Washington's depth