Regulation
Severe flooding around the lake led to the excavation of an improved outlet channel between 1899 and 1901. In 1933 following dry years in the late 1920s and early 1930s, the Province constructed a concrete control dam across the Fairford River immediately downstream of the channel. A new dam was constructed in 1961. The new structure is operated to try to control levels between 810.5 and 812.5 feet (247.0 and 247.7 m) above sea level.
| Period | Max level | Average level | Min level | Av. annual range |
|---|---|---|---|---|
| Pre 1960 | 816.25 ft (248.79 m) | 812.17 ft (247.55 m) | 809.92 ft (246.86 m) | 1.4 ft (0.43 m) |
| 1960–1999 | 813.48 ft (247.95 m) | 811.92 ft (247.47 m) | 810.36 ft (247.00 m) | 1.27 ft (0.39 m) |
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