Brennan is built on a strong, family oriented foundation. There is little that we haven’t been able to accomplish over the last century. From mixing concrete in a wooden barrel on the back of a Ford Model T truck to surgically dredging contaminated sediments off the bottom of an inland waterway, Brennan has a rich tradition of accomplishing the indescribable.

    1919

    James (Jim) and Eugene (Gene) Brennan leave the family farm and form Brennan Brothers Construction in Lansing, IA to begin building county bridges.
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    1930s

    Jim moves to La Crosse, WI and opens a Brennan Brothers office next to the Milwaukee Road Roundhouse near the banks of the Black River.
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    1940s

    With the World War II effort in full swing, Brennan provides bridge construction services to area railroads.
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    1950s

    Brennan Brothers specializes in bridge construction for the U.S. and State DOTs, including work along the new Interstate System.
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    1953

    Brennan Brothers increases its focus on marine construction when contracted by the U.S. Coast Guard to maintain navigational day markers between St. Paul and St. Louis.
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    1959

    Jim and Gene decide to divide their business. Jim incorporates as J.F. Brennan Company, Inc. in La Crosse and Gene continues to operate as Brennan Construction in Lansing.
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    1960s

    Brennan begins working for the U.S. Army Corps of Engineers to rebuild levees along the Mississippi River from Minnesota down to southern Iowa.
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    1970s

    Growth continues as Brennan begins to provide mechanical dredging and Lock and Dam construction services to the U.S. Army Corps of Engineers.
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    1984

    Brennan Marine Inc. is formed to provide harbor management services to the Port of La Crosse.
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    1989

    Brennan purchases the hydraulic dredging operations of the F.J. Robers Company to expand navigational dredging and habitat restoration capabilities.
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    1993

    Brennan expands its services to hydroelectric generation facilities, focusing initially on above and below water specialty concrete placement.
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    2000

    As the New Millennium begins, Brennan enters into the environmental remediation industry by dredging contaminated sediment from the Grand Calumet River in Gary, IN.
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    2013

    Pro-Dive, Inc. of Ottawa, IL is purchased, making Brennan one of the largest dive contractors in the Midwestern United States.

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    2014

    As railroads respond to growing market demands, Brennan forms a Rail Group to provide quality bridge construction and environmental response services.
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    2015

    A new logo is adopted to represent Brennan’s focus on the construction, transportation and environmental markets, as well as our above and below water capabilities. Expansion into Canada has also begun with the incorporation of J.F. Brennan Company Canada.
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