The USCGC Greenbrier is a Kankakee class 75-foot river buoy tender which was built in 1990 by Avondale Shipyard Small Boat Division, New Orleans, Louisiana. The tenders push a specific-use 130 foot maintenance barge, with specialized cranes and equipment. The vessel has a 24 foot beam, 5 foot of draft, and displaces 172 tons (full load). There is a crew of 19 but only 13 racks on board. The Kankakee class ships were built to replace old vessels. These are powered by 2 diesel engines turning 2 shafts with 1,080 bhp, giving the vessels a capability of