Col du Glandon (1924 m ) is a high mountain pass in the Dauphiné Alps in Savoie, France, linking Le Bourg-d'Oisans to La Chambre. It is situated between the Belledonne, Grandes Rousses and Arvan-Villards mountain ranges, west of the Col de la Croix de Fer. The road over the Col du Glandon was opened in 1898, although it was not linked to the Col de la Croix de Fer until 1912.
The road over the Col du Glandon was being constructed during 1898.
The road was opened in 1898, so it would have been worked on during that year.  You do not build a road and let it sit unused for many months.