Großsee is a high mountain dam, at an elevation of 2.481m (8,139ft) above the sea level, located in the district of Spittal an der Drau in the Austrian state of Carinthia.
The road to the summit is asphalted, but very narrow and steep. Starting from Döllach, at 1.010m above the sea level, the ascent is 15.2 km long. Over this distance, the elevation gain is 1.402 meters. The average percentage is 9.2 % and the maximum slope is 20% .
The road to the dam was built in 1978. The road is narrow and nice. The asphalt ends at 2470m, and the last stretch is unpassable due to big stones/boulders and snow. The last 4,5 kms twisted on the grassy mountainside with fantastic panorama to mountains and onto the Kegelsee (lake).
More info&pics: http://www.gyorgyigabor.hu/2007_tauern_eng.php