The Seneca Lake Rule Curve defines the lake’s seasonal target levels:

Seneca Lake Rule Curve

Seneca Lake Rule Curve



  • Summer Target = 446.0 ±0.3 foot (445.7 – 446.3 feet)
  • Winter Target = 445.0 ±0.3 foot (444.7 – 445.3 feet)

The water level of Seneca Lake is partially determined by the physiological features found within the Oswego River Basin, however the Seneca Lake Rule Curve, developed in the mid-70s by Gordon  Hansen of the Navy’s Underwater System  Center at Dresden,  defines the lake’s highest tolerable level, lowest tolerable level.    Rule curves establish a target range for the water level, helping to prevent severe flooding or severe drought conditions, ensuring a stable, reliable water supply throughout low water summer months and protecting damage to delicate natural resources during high water months.

Seneca Lake Water Level Extremes:
PERIOD OF RECORD–October 1956 to September 2013

1993 Record High = April 26, 1993 at 448.95ft

1978 Record Low = March 14, 1978 at 442.64ft

1972 Flood of 1972 = June 25, 1972 at 448.85ft

Seneca Lake Water Level Charts