Sign in

Private company

Basalt Rock Company

Former American industrial company

Basalt Rock Company was a multifaceted industrial operation that was founded in 1920. The company started as a rock quarrying operation located a few miles south of Napa, California near Rocktram adjacent to the Napa River. It later branched out into the ship building business in 1941 when it started building ships for the U.S. Navy for use during World War II.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

1920Founded1
  • Industryshipbuilding1

See how the biggest companies compare on our leaderboards

USS Grasp (ARS-24)
Photo: US Navy, Public domain, via Wikimedia Commons3

Basalt Rock Company was a multifaceted industrial operation that was founded in 1920. The company started as a rock quarrying operation located a few miles south of Napa, California near Rocktram adjacent to the Napa River. It later branched out into the ship building business in 1941 when it started building ships for the U.S. Navy for use during World War II. Following the war, the plant built 30 miles of pipe for the City of Napa's pipeline from Lake Hennessey.2

Timeline

  1. 1920Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

  1. 1
  2. 2
  3. 3