An ongoing shortage of crew is the “No. 1 risk factor” for the Alaska Marine Highway System, Transportation Department Deputy Commissioner Katherine Keith told legislators.

As of a Feb. 2 presentation to the Senate Transportation Committee, the ferry system was short just over 100 crew for full staffing to efficiently operate the winter schedule, about a 20% vacancy factor for onboard employees.

The ferry system, however, is able to run its schedule with crew members…