Ouvrage Col de Crous is a lesser work (petit ouvrage) of the Maginot Line's Alpine extension, the Alpine Line.

The ouvrage consists of one infantry block at an altitude of 1,963 metres (6,440 ft).

Additional blocks were planned but not built.

[1] Two proposed petits ouvrages were proposed for the same ridge to the north, the Ouvrage du Col-de-Pal and the ''Ouvrage du col-de-Jallorgues, neither of which were started.

[2]