Zervreilasee
Zervreilasee is a high mountain reservoir at an elevation of 1.862m (6,108ft) above the sea level, located in the canton of Graubünden, Switzerland.
![Zervreilasee](https://www.dangerousroads.org/cache/images/900x/1/zervreilasee0-56374601.jpg)
The road to the reservoir is asphalted but pretty narrow and really steep (with sections up to 13.0%). The road was completed in 1957. Access is usually only possible from June to October.