Built in 2012 by Diversified Marine of Portland, Oregon as the Sommer S (hull #24) for the Shaver Transportation Company of Portland, Oregon.
Named in memory of Sommer Sondra Shaver, sister of company president Steve Shaver.
Her powerplant consists of two MTU M62 diesels driving twin four-blade, 96 (in) stainless steel propellors in Schottel Z-Drives, for a rated 5,364 horsepower.
Electrical load is provided for by two Cummins 6CTA 8.3 145kW generators.
The tug's towing gear is a Markey DEPCF-48 winch equipped with 500 (ft) of 8 (in) line.