The octagonal stone tower and attached keeper's dwelling remained in use, essentially unchanged, into the early 20th century.

The tercentenary of Champlain's explorations of the lake provided the occasion for celebrations marking the event, and commissions from New York and Vermont, put in charge of the festivities, decided to erect a monument.

A suggestion in a newspaper prompted the notion to convert an existing lighthouse, and after some consideration of other sites, the Crown Point Light was chosen.

A new tower was constructed on and around this, consisting of a short tapered base, a ring of eight Doric columns, an elaborately carved cornice and parapet, and a new lantern atop the whole.

A fifth order Fresnel lens continued to shine in the lantern giving a fixed white light, and the old keeper's house remained in place, attached to the new tower by a short passageway.