The ferry's passenger cabin was updated in the late 1990s, included in the upgrades were the removal of many tables located in the passenger cabin to allow for the bench seats to be spaced closer together in some sections of the ship, and an upgrade of the galley area.

[4] The problem was eventually traced to the computer that controls the pitch of the props, which because of a large amount of unshielded wiring, would short out a couple of signal lines causing the props to re-angle for full propulsion, instead of reversing.

[9] On the morning of February 18, 2021, a propulsion issue was found on the Cathlamet, forcing the Sealth to take over the Southworth–Vashon Island–Fauntleroy route.

[10] A year later, on July 28, 2022, the Cathlamet collided with the pilings near the Fauntleroy dock, sustaining significant damage to one end in the process.

[11] An investigation attributed the accident to human error,[12] and Cathlamet returned to service in April 2023.