A ramp assembly for a pontoon boat includes a pair of ramp support members, at least two rollers, and a ramp. The ramp support members are positioned beneath a deck of the pontoon boat and include a vertically-oriented portion. The rollers are rotatingly mounted to the vertically-oriented portion of the ramp support members. The ramp includes a pair of side rails, each side rail positioned on a side of a ramp walkway, the side rails each having an upper rail member and a lower rail member joined by a web and forming an outboard pocket. The ramp is rollingly received between the ramp support members such that the rollers are positioned in the outboard pocket of the side rails.