She was laid down at Oyster Bay, Long Island, New York, by Jakobson Shipyard as Yard Number 420 and launched on 22 July 1964.

Mascoutah entered service in August 1964 and was initially assigned to duty in the 5th Naval District, Norfolk, Virginia.

Reclassified YTM‑760 in September 1965, she served out of Norfolk until the summer of 1966 when she arrived in Philadelphia for duty in the 4th Naval District.

On 15 June 1986, Mascoutah was withdrawn from service and transferred to the Maritime Administration and placed in the National Defense Reserve Fleet, then transferred to the Saint Lawrence Seaway Development Corporation in 1989.

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