Abstract: A detachable stairway system for use with a telescoping water vehicle ladder includes a frame, top and bottom brackets, and at least two steps hingedly mounted to the frame. Optionally, support cables and/or pneumatic cylinders can be added for support. A user attaches the stairway system to a ladder by hooking the bottom bracket under a bottom rung of the ladder, lifting the stairway system, and hooking the top bracket over a top rung of the ladder. Hooks may be utilized to more fully secure the stairway system to the ladder. The telescoping nature of the ladder allows it to expand/contract during attachment of the stairway system and to fully support and stabilize the stairway system to provide a safe and easy way to enter/exit a water vehicle. The hinged nature of the steps allows the stairway system to be folded for stowing/storage.