What to do · Mont-Saint-Michel
Couesnon Dam and Footbridge on Foot
Information
- Price
- Free on your own · guided Balade Grand air walk €5 to €7
- Duration
- 1 h
- Distance
- 2.5 km
- Season
- All year
- Who it's for
- Everyone; flat
- With a dog
- On a lead on the road and the footbridge
Between the car park and the mount there are two works that explain the site today: the Couesnon dam and the footbridge. Together they are part of the big project that restored the mount's island character, after the old 1879 causeway and the canalisation of the river had been filling the bay with sand. Walking them is also the best way to see the mount grow in front of you, and the classic walk for the photo.
The dam
The dam closes the River Couesnon at La Caserne, about 2 km from the islet, and was completed in the late 2000s. At high tide it lets sea water in upriver; at low tide it releases it all at once, opening the gates gradually, and that current carries away the sand that builds up around the mount. From the road you see the gates and, if a release coincides, the water coming out hard towards the bay. On top of the dam there is an open esplanade, with the mount straight ahead.
The footbridge
From the dam you continue towards the mount along the road and the footbridge, about 760 m long, a light platform on piles that replaced the causeway. At the highest spring tides the water passes underneath and can cover the last stretch, which is cut off for a few hours. From the information centre it is about 35 to 40 minutes on foot to the village gate, on the flat. The Le Passeur shuttle makes the same journey for free, and the usual thing is to go up on it and walk back, with the afternoon light facing the mount.
With a guide
The Établissement public du Mont-Saint-Michel, the body that manages the site, organises the Balade Grand air: an hour and a half and about 4 km through the ponds, marshes, the Couesnon estuary and the salt meadows, with stops to see the tide and the dam in action. It costs €5 to €7 for adults, €3.50 to €5 for young people and is free for under-8s. The next one is on 5 December 2026, from 14:00 to 15:30, from the tourist information centre; book on their website.
Tips
- Go by shuttle and walk back The photo of the whole mount is on the footbridge, halfway, best in the afternoon.
- Look for the release At low tide, from the dam you can see the water coming out through the gates.
- Wrap up warm On the footbridge the wind from the bay blows almost always.
Frequently asked questions
How long does it take to walk from the car park to the mount?
Between 35 and 40 minutes along the road and the footbridge, on the flat.
What is the Couesnon dam for?
It holds the high-tide water and releases it at low tide to carry away the sand built up around the mount.
Can I visit with a guide?
Yes, on the Balade Grand air walks run by the body that manages the mount, from €5.
Does the footbridge flood?
Only the last stretch and only on the biggest tides, for a few hours.
With young childrenAs a familyWith a dog
Who runs it
- Établissement public du Mont-Saint-MichelBalade Grand air: polders, marshes, tide and dam with a guide Visit their website
