Funding for a second Olympic-class vessel was authorized in the spring 2012 session of the Washington State Legislature and the keel laying and first weld took place on March 8, 2013.
The name Samish was decided by the Washington State Transportation Commission on November 13, 2012 (the same day of the naming of the MV Tokitae) after a public outreach process. The vessel is named after the Samish Indian Nation, a Coast Salish tribe whose name means "giving people".[3]
On December 21, 2013, the ship's superstructure was rolled out from Nichols Brothers Boat Builders and sent to Seattle on December 23 to be joined with the hull which was under construction at the Vigor Shipyards.
The Samish was accepted by Washington State Ferries on April 10, 2015 and was officially christened on May 20 in Anacortes. The ship underwent two months of sea trials and crew training before entering service on the Anacortes/San Juan Islands route at the start of the Summer 2015 sailing season on June 14 at 9:05am sailing from Anacortes to Friday Harbor.[4]
The Samish is also listed as one of the 10 Best Passenger Ships of 2015 (the year she was launched), on Marine Log.[5]
The Samish was pulled from service on February 21, 2016, after the discovery of a quarter-sized hole in the hull below the water line, later found during a drydock inspection to be linked to corrosion. The ferry was re-entered service on March 10 after some minor patchwork.[6]
On August 7, 2017, the Samish was removed from service due to a problem with the number two drive engine, causing the Anacortes/San Juan Islands route to be operated on an emergency four boat schedule until a replacement boat entered service.
On March 10, 2024, the Samish assisted US Coast Guard crews in the rescue of 6 passengers and 2 dogs from a private vessel in distress in the Rosario Strait. Samish took on 4 passengers before the Coast Guard arrived, and positioned the ferry to provide protection from wind and waves for the rescue effort.[7]