The Truyère gorges are traversed by lacs. This wild landscape has been shaped by the creation of numerous dams, creating a industrial heritage which cannot be found anywhere else. In summer, discover with family or friends the history, construction and operation of these dams and more broadly, the history of hydroelectricity in the Lot and Truyère valleys.


If hydroelectricity only represents half of electricity production in France, it is the only energy source likely to be modulated quickly according to demand and thus compensate for peaks in consumption.

In 2020, hydraulics represents 49% of gross renewable electricity production in France. With more than 2 installations, France is, with Sweden, one of the main producers of hydraulic energy in the European Union.

Maury Truyere dam

The dams on the Truyère gorges

To the west of Aubrac is a river: la Truyere. South of the Aubrac, there is another river: the Lot. These two valleys, sometimes without much difference in altitude, sometimes very steep, are exceptional and unique for their concentration of hydroelectric dams. Twenty dams weight type, mobile, arch or multi-arch feed fifteen production centers, including the Montézic pumped energy transfer station, the second most powerful hydroelectricity production site in France.

All these hydroelectric developments contribute to the production of the first renewable energy in France. They represent 10% of the power of EDF's hydraulic fleet in France.

Map of the Lot valley Truyère gorges

Did you know ?

La Truyere : it takes its source in the Monts de la Margeride, at the Col des Trois Sœurs, in Lozère, at an altitude of 1 m and flows into the Lot at Entraygues-sur-Truyère (in Aveyron).

The Batch : it takes its source on the side of the Goulet mountain, in Lozère, at an altitude of 1 m and flows into the Garonne at Aiguillon (in Lot-et-Garonne).

The history of dams

EDF – Pierre Soissons
Montézic dam and lake

The Truyère basin

The steep drop of the Truyère makes it one of the most interesting rivers in the Massif-Central for hydroelectric production.

From 1910 a development project was studied. This will be the start of the metamorphosis of these gorges with the construction of several dams and factories.

The first will be Brommat 1 underground hydroelectric power station which was inaugurated in 1933 by the President of the Republic at the time, Albert Lebrun. Then in 1934, the Sarrans dam is put in water. This dam is still today the most important in the Truyère valley, and one of the largest in France. Then came Lardit-Maury (1947), Couesques (1950), Cambeyrac (1957), Grandval (1959), Lanau (1962), Brommat 2 (1975) and finally the latest and most powerful in the valley: Montezic, put into service in 1982.

The Lot basin

Before the confluence with the Truyère, the Lot is equipped with two structures: Castelnau Lassouts (between Saint-Geniez-d'Olt and Saint-Côme-d'Olt) commissioned in 1949 and Golinhac (between Estaing and Entraygues-Sur- Truyere) in 1960.

The different dams

Factory nameYear of commissioningEngimeType of damArea
grandval196074 MWGrandval (1959): multiple vaults
Ganivet (1954): water intake
Moulinet (1959): water intake
1 ha
14,5 ha
16 ha
Silt196220 MWLanau (1962): thin vault158 ha
Sarrans1934183 MWOn the Truyère (1934): weight
On the Cantoinet (1934): weight
1 ha
0,1 ha
Bromat 1
Bromat 2
406 MWLa Barthe (1974): vault
Salazats (1974): weight
La Bromme (1932): vault
La Cadène (1932): weight
40 ha
0,1 ha
Montezic1982920 MWMontézic (1982): upper reservoir233 ha
couesques1950120 MWCouesques (1950): slender vault with overhanging crest
Le Goul (1950): vault
260 ha 
18 ha
Bacon194743 MWMaury (1947): vault166 ha
Cambeyrac195712 MWCambeyrac (1957): weight23,4 ha
Castelnau-Lassouts194942 MWOn the Lot (1948): weight
Mousseau (1950): weight
218 ha
0,1 ha
Golinhac196045 MWGolinhac (1960): weight53 ha

Industrial tourism

These structures astonish, impress and many people ask themselves questions about their construction, their history, their operation. Thanks to the energy road, information spaces, visiting circuits, developed viewpoints, will allow you to better understand hydroelectricity in general and more particularly in the Truyère gorges and the Lot valley.

Nautical activities

Hydroelectric production has changed the economic climate by creating dams, bodies of water and lakes important, thus promoting the development of tourism: establishment of campsites or water sports.


In a setting of untamed beauty, fisherman will be happy, with at their disposal numerous lakes and rivers of second category, where you can fish for pike, zander, trout, carp or tench. But also rivers of first category and a significant network of streams where wild trout is king.

Nautical activities Saint Gervais lake


Numerous hikes will allow you to discover magnificent views on these gorges that have remained wild. Hiking guides are on sale in the various offices of the Tourist Office, come and find us, we will advise you.

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