Les Moulins Souterrains du Col-des-Roches au Locle

Useful Information

Location: 2 km from the center of Le Locle.
Open: MAY to OCT daily 10-17:00, tours at 10:15, 11:30, 13:30, 14:45, 16:00.
NOV to APR Tue-Fri 14-17, tours at 14:15, 15:30, Sat-Sun 14-17, tours at 14:30, 16.
Closed 24-DEC to 02-JAN.
Fee: Adults CHF 14, Children (6-18) CHF 7, Students CHF 11.50, Family (2+2) CHF 30.
Groups: Adults CHF 9.50, Children (6-18) CHF 4, Students CHF 8.
Classification: SpeleologyKarst cave SpeleologyRiver cave
Light: LightIncandescent Electric Light System
Dimension: T=7 °C.
Guided tours: D=50 min.
Bibliography: Van der Paas, Jan Paul (1996): Underground mills at Col des Roches (NE), In: Speleophilately International, Schimmert (NL), Nr. 49, 1996, S. 26. Fig. N1824
Address: Fondation des Moulins souterrain du Col-des-Roches, Col 23, 2400 Le Locle, Tel: +41-32-9318889, Fax: +41-32-9318915. E-mail: contact
Ville du Locle, Secrétariat aux Musées, 2400 Le Locle, Tel: +41-32-9316262, Fax: +41-32-9318989.
As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
Please check rates and details directly with the companies in question if you need more recent info.


1660 underground mills created by Jonas Sandoz.
1844-45 renovated and new mill erected by Jean-Georges Eberlé.
1973 start of development as a museum.
1987 opened to the public.


A factory in a cave! The underground mills of Col-des-Roche, are unique in Europe and a testimony to man's ingenuity and courage. On a 400 year old historical site 2 km from the centre of the town, visitors can plunge into an underground world to discover an astonishing use of hydraulic energy. Formerly, the water forced its way through the mass of limestone that blocked its path. Gradually, generations of millers hewed away the rock, dug wells and aqueducts so as to build, perfect and power an impressive system of hydraulic wheels, mills, paddles and saws. The history of these men is illustrated throughout the cave and in its museum.

Text by Tony Oldham (JUN-2001). With kind permission.