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Hinckley Reservoir Water Levels

Information on this page provides current data and operating parameters related to ongoing management of Hinckley Reservoir water levels.
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2019 Water Level Data Table
Date Hinckley Reservoir Elevation
(ft)
Hinckley Reservoir
Comparison to Elevation Trigger
(ft)1
Hinckley Reservoir Comparison to Normal Elevation
(ft)2
Hinckley Reservoir
Discharge
(cfs)3
2012 Operating Diagram Release
(cfs)4
Hinckley Reservoir Inflow
(cfs)
Hinckley Reservoir
30-Day Running Average Inflow
(cfs)5
Wilmurt Streamgage Flow
(cfs)6
Black Creek Flow
(cfs)
Mohawk Valley Water Authority Withdrawal
(cfs)
Delta Reservoir Elevation
(ft)
Delta Reservoir Discharge
(cfs)
Nine Mile Feeder Discharge
(cfs)
01/15 1217.6 N/A 7.5 1125 1070 504 1502.0 N/A 92 31.8 541.9 1390 0
01/14 N/A N/A N/A N/A N/A N/A 1503.0 N/A 92 N/A N/A N/A N/A
01/13 N/A N/A N/A N/A N/A N/A 1468.0 N/A 104 N/A 542.1 1390 0
01/12 1219.3 N/A 8.4 1230 1100 558 1435.0 N/A 115 31.0 542.1 1390 0
01/11 1219.9 N/A 8.6 1098 1100 602 1432.0 N/A 131 34.1 542.2 1390 0
01/10 1220.3 N/A 8.8 1218 1100 842 1431.0 611 181 31.0 542.1 1390 0
NY Power Authority Comments : The New York State Canal Corporation has authorized the New York Power Authority to revert to the 2012 Operating Diagram beginning January 10.
01/09 1220.6 N/A 8.9 1803 1420 896 1420.0 732 202 31.0 541.7 1390 0
01/08 1221.3 N/A 9.4 1821 1420 712 1413.0 558 183 31.4 541.3 1390 0
01/07 1222.2 N/A 10.2 1829 1420 508 1413.0 468 168 30.2 541.4 1390 0
01/06 1223.2 N/A 11.0 1826 1650 776 1418.0 688 145 30.3 542.4 1390 0
01/05 1224.0 N/A 11.7 1826 1650 927 1426.0 813 193 28.6 543.4 1390 0
01/04 1224.7 N/A 12.4 1832 1650 1156 1438.0 1010 240 30.4 544.2 1390 0
01/03 1225.2 N/A 12.9 2175 1650 1695 1461.0 1320 334 29.8 545.0 1390 0
01/02 1225.6 N/A 13.3 2612 1650 2533 1503.0 1860 582 29.9 545.7 1400 0
01/01 1225.7 N/A 13.4 2213 1650 2706 1545.0 2210 617 N/A N/A N/A N/A
NY Power Authority Comments : On Monday, December 31, 2018, The New York State Canal Corporation has authorized the New York Power Authority to deviate from the 2012 Operating Diagram, to increase the Hinckley Reservoir release rate to 1,800 cfs to lower Hinckley Reservoir water level to minimize the potential for downstream flooding, until further notice.

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1 The Elevation Trigger is invoked when Hinckley Reservoir elevation falls below the 10% historical low level. The elevation trigger is 1222 feet in May, 1198 feet October 15 to December 31 and linearly interpolated from 1222 feet on May 31 and 1198 feet on October 15.

2 "Normal" Hinckley Reservoir elevations for a given date are based upon the average of 59 years of daily Hinckley Reservoir elevation data (1942-1979 and 1987-2007).

3 cfs is the abbreviation for cubic feet per second.

4 The 1920 Operating Diagram establishes the rate of release of water from Hinckley Reservoir based upon varying reservoir levels throughout the year. 

5 The Inflow Trigger is invoked when the 30-day running average Hinckley Reservoir inflow is below 300 cfs.

6 The Wilmurt plus Black Creek streamflow represents 80% of the Hinckley watershed area.