| Chapfensee | |
|---|---|
| Location | Mels, Canton of St. Gallen |
| Coordinates | 47°03′00″N 9°22′34″E / 47.05000°N 9.37611°ECoordinates: 47°03′00″N 9°22′34″E / 47.05000°N 9.37611°E |
| Type | reservoir |
| Basin countries | Switzerland |
| Surface area | 9 ha (22 acres) |
| Water volume | 430,000 m3 (350 acre·ft) |
| Surface elevation | 1,030 m (3,380 ft) |
Chapfensee is a reservoir at Mels, Canton of St. Gallen, Switzerland. The area around the reservoir is a nature preserve.
The reservoir was built in 1946/1947 and used to generate power at the plant Plons.