Built in 1970 Industrial Steel and Machine Works of Gulfport, Mississippi as the Terilyn (hull #100) for the Smith Rice Derrick Company of Alameda, California.
She was later acquired by the Dutra Construction Company of Alameda, California. Where the tug retained her name.
The tug was later acquired by Masters Tug and Towing LLC of Bethel Island, California. Where she retained her name.
In 2003, she was acquired by Westar Marine Services Incorporated of San Francisco, California. Where the tug retained her name.
Her powerplant consists of two CAT 3508E diesels turning two propellors. For a rated 1,550 horsepower.