The Pacific Bridge Company was established in California in 1869 and opened its Portland office in 1880. It constructed many Portland bridges, including the Morrison, Burnside, Interstate, and Ross Island bridges. Collection includes trial balance book, 1911-1913, and account book, 1888-1897.

The Pacific Bridge Company was established in California in 1869 and opened its Portland office in 1880. It constructed many Portland bridges, including the Morrison, Burnside, Interstate and Ross Island bridges. Records include cash books, journals, ledgers, letterpress books, voucher registers, and miscellaneous business papers.