The Crozet lake is located in Belledonne mountain range in the French Alps at 1974m above see level. From the city of Grenoble nearby, it takes about 45 minutes to drive the 27km. You'll have to walk for 2h30 to 3 hours to hike the ~750 meters, the path is well signposted, a bit steep at the start but within everyone's reach. Being a mountain lake, the water of the lac du Crozet is often pretty cold athough it is bathable in summer.
Lake Crozet is perched at an altitude of 1974 m, above /lake Freydières, on the path that leads to the La Pra refuge. The walk offers a splendid view of the Grésivaudan valley and the Chartreuse massif. Its edges were raised more than a century ago by Aristide Bergès, father of white coal, who was able to increase its capacity and put its waters under penstocks, over nearly 1800 metres of difference in height.
How to get there: Take the exit of the A41 motorway number 25 "Domène / Montbonnot-Saint-Martin". Go to Montbonnot-Saint-Martin, continue straight on the D11 towards Domène. At Domène, take the direction of Revel then direction Freydières. At Les Freydières, leave the first car park on the right (in front of the restaurant) and continue along the paved road. Park approximately 500 metres on the Pré Raymond car park (1370m), this will save you a hard walk on the asphalt.