Built in 2017, by Diversified Marine Incorporated of Portland, Oregon (hull #35) as the Rich Padden for Tug Construction LLC. of Seattle, Washington.
In 2017, the tug was chartered to Harley Marine Services Incorporated of Seattle, Washington. Where she retained her name.
In 2019, she was returned to Tug Construction LLC. of Seattle, Washington. Where she was chartered to the Foss Maritime Company of Seattle, Washington. Where the tug retained her name.
In 2020, the tug was acquired by the Foss Maritime Company of Seattle, Washington. Where she was renamed as the Lillian Foss.
Powered by two, Tier III compliant, Caterpillar 3516 diesel engines. With Rolls Royce US205FP z-drives. Equipped with two, four bladed, Nibral, skewed 2,400(mm)/94(in) propellers. For a rated 5,300 horsepower.
Her electrical service is provided by two, Tier III complaint Caterpillar C7.1 generator sets. The tug's capacities will be 30,000 gallons of fuel, 2,800 gallons of fresh water, and 370 gallons of lube oil.
The deck equipment consists of a Markey DEPC-46 towing winch, mounted on the bow. Outfitted with 600(ft) of 8(in) spectra line. And a Markey DEPC-32 towing winch, mounted on the stern. Outfitted with 250(ft) of 6(in) spectra line.