Basalt Rock Company
| Company type | Private |
|---|---|
| Industry | Quarrying, Shipbuilding, Cement manufacturing |
| Founded | 1920 |
| Headquarters | Napa , United States |
| Products | Quarry materials, Ships, Cement |
Basalt Rock Company originated in 1920 as a quarrying enterprise located near Napa, California. By 1941, the firm had diversified into ship construction, manufacturing vessels for the U.S. Navy throughout World War II. Following the conclusion of the war, the company played a significant role in regional development by installing 30 miles of pipeline for Napa, sourcing water from Lake Hennessey.
In 1950, Basalt Rock purchased a cement manufacturing facility previously owned by Standard Portland Cement Company, situated in what is currently American Canyon, California. This plant remained operational until 1978 and was under consideration for redevelopment as of 2001.
Successor companies of earlier corporate sales
The steel production facility was sold to Kaiser Steel in 1955 and later transferred to Oregon Steel Mills in 1988, operating under the name Napa Pipe until its closure in 2004. Efforts to convert this location into residential housing encountered considerable resistance and controversy.
The division handling rock and sand resources was acquired by Dillingham Construction during the early 1970s and subsequently purchased by Syar Industries in 1986. As of 2018, it functions as Syar's Napa Quarry, with announced plans in 2013 to increase annual aggregate production from one million to two million tons, reflecting strategic growth and investment in capacity expansion.
Ships built
Throughout World War II, Basalt Rock Company contributed to naval shipbuilding by producing a variety of vessels for the US Navy and other customers, including yard oilers, freight barges, lighters, and rescue ships. These craft supported both wartime supply chains and postwar naval activities, showcasing the company's versatile business approach and leadership in manufacturing. Key ships include yard oilers such as Crownblock (YO 48) and Whipstock (YO 49), several freight barges commissioned by CPNAB, and a series of rescue vessels like Grapple (ARS 7) and Preserver (ARS 8), which were eventually sold or transferred abroad. This shipbuilding portfolio underscores the company’s competitive edge and influence within its industry during that era.