Lago di Teleccio is a high mountain artificial lake at an elevation of 1.918m (6,292ft) above the sea level, located in the Italian region Piedmont, within the Gran Paradiso National Park. It’s a mind numbing vertical drop of hundreds of meters so you might want to give it a miss on a windy day. The road is really steep, with sections up to 15.7% and 20 hairpin turns. It is narrow, so keep the speed down and be ready to move over and make room for oncoming vehicles.
The road to the reservoir is called Strada al lago Teleccio. This road has humbled many egos. It’s not for the sissies and shouldn’t be attempted by novice drivers. It’s paved (since 2006) and very narrow, impassable for 2 cars at the same time.
The road is really steep, with sections up to 15.7% and includes 20 hairpin turns. The last 6.3km of the road are closed to private cars. Starting from Casetti - Rosone, the ascent is 11.66 km long. Over this distance, the ehelavtion gain is 1.189 meters. The average percentage is 10.1 %. Do not travel this pass in severe weather conditions.