| Lac St. Cyr | |
| Pushpin Map: | Alberta |
| Location: | County of St. Paul No. 19, Alberta |
| Coords: | 53.896°N -111.193°W |
| Basin Countries: | Canada |
| Length: | 2.3km (01.4miles) |
| Width: | 1.8km (01.1miles) |
| Area: | 2.46km2 |
| Depth: | 5.1m (16.7feet) |
| Max-Depth: | 21m (69feet) |
| Elevation: | 648m (2,126feet) |
| Reference: | [1] |
Lac St. Cyr is a lake in the County of St. Paul No. 19, Alberta. The lake is near the town of St. Paul and since 1951 has been used as a source of water. In 1978, seasonal pumping of water from the North Saskatchewan River into the lake was begun to address a fall in the water level.[2]