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Road cycling routes

France

Bourgogne-Franche-Comté

Clamecy

Marigny-L'Église

Col de Marigny – Crescent Dam loop from Mazignien Coutolles

Routes

Road cycling routes

France

Bourgogne-Franche-Comté

Clamecy

Marigny-L'Église

Col de Marigny – Crescent Dam loop from Mazignien Coutolles

Moderate

riders

Col de Marigny – Crescent Dam loop from Mazignien Coutolles

02:09

39.5km

730m

Road cycling

Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.

Last updated: May 12, 2026

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Your route passes through a protected area

Please check local regulations for:

Parc naturel régional du Morvan

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5.08 km

Col de Marigny

Highlight • Mountain Pass

The view is magnificent but you have to hang on in winter!

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5.28 km

Panoramic View of Marigny-l'Église

Highlight • Viewpoint

A steady climb but the scenery is worth it. Do not hesitate to take a break at the very nice and flowery inn.

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9.05 km

The Crescent Dam was built between 1929 and 1932. A gravity dam, it is 330 meters long and 37 meters high. Its width at the base is 24 meters and at the crest 3.5 meters. It was built on the initiative of SA Compagnie HydroElectrique de la Cure and was owned by the City of Paris until 1946. The dam was built to regulate the waters of the Yonne and Seine rivers and thus prevent flooding in Paris, while also producing electricity. More than 165 hectares of cultivated land, hamlets, mills, and paths were flooded to allow the creation of the reservoir (maximum depth of 40 meters). It occupies four municipalities and two departments, and is fed by the Cure and Chalaux rivers. The structure was partly financed by war reparations owed by Germany to France after the First World War. This is why much of the dam's mechanisms are German-made.
The road across it is narrow and only allows passage for one vehicle. Fortunately, there is very little traffic.

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