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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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2020 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)
02/20 1202.8 N/A 1.3 892 890 416 490.0 N/A N/A N/A N/A 252 0
02/19 1203.4 N/A 1.6 934 930 472 495.0 N/A N/A 27.7 N/A 252 0
02/18 1204.0 N/A 2.0 933 930 354 501.0 N/A N/A 28.5 N/A 252 0
02/17 1204.6 N/A 2.5 937 930 414 515.0 N/A N/A 30.2 N/A 248 0
02/16 1205.2 N/A 2.9 980 970 336 526.0 N/A N/A 28.6 N/A 252 0
02/15 1206.0 N/A 3.3 976 970 319 541.0 N/A N/A 24.1 N/A 252 0
02/14 1206.7 N/A 3.6 975 970 376 575.0 N/A N/A 29.3 N/A 248 0
02/13 1207.4 N/A 3.9 974 970 459 622.0 N/A N/A 27.3 542.8 252 0
02/12 1207.9 N/A 4.1 973 970 -448 701.0 N/A N/A 18.9 542.8 252 0
02/11 1209.5 N/A 5.3 977 970 1013 900.0 N/A N/A 26.3 542.8 255 0
02/10 1209.5 N/A 4.9 978 970 977 1102.0 N/A N/A 26.3 542.7 255 0
02/09 1209.5 N/A 4.5 996 990 552 1047.0 N/A N/A 24.0 542.7 255 N/A
02/08 1210.0 N/A 4.6 999 990 700 1023.0 N/A N/A 25.5 542.7 255 N/A
02/07 1210.3 N/A 4.5 986 990 609 1008.0 N/A N/A 24.1 542.7 259 N/A
02/06 1210.7 N/A 4.6 1090 990 460 1011.0 N/A N/A 24.9 N/A N/A N/A
02/05 1211.2 N/A 4.8 1025 1020 357 1027.0 N/A N/A 27.5 542.6 252 N/A
02/04 1211.9 N/A 5.2 1025 1020 373 1054.0 N/A N/A 28.4 542.7 252 N/A
02/03 1212.5 N/A 5.6 1020 1020 412 1100.0 N/A N/A 35.0 N/A N/A N/A
02/02 1213.1 N/A 6.0 1061 1050 418 1125.0 N/A N/A 28.4 542.8 252 N/A
02/01 1213.7 N/A 6.4 1055 1050 403 1138.0 N/A N/A 28.4 542.8 252 N/A
01/31 1214.3 N/A 6.7 1058 1050 424 1150.0 N/A N/A 28.4 542.8 252 N/A
01/30 1214.9 N/A 7.0 1052 1050 410 1172.0 N/A N/A 12.0 542.8 252 N/A
01/29 1215.5 N/A 7.4 1067 1060 502 1209.0 N/A N/A 28.4 N/A N/A N/A
01/28 1216.0 N/A 7.7 1066 1060 636 1240.0 N/A N/A 27.7 543.5 255 N/A
01/27 1216.4 N/A 8.0 1063 1060 687 1248.0 N/A N/A 29.3 525.1 259 N/A
01/26 1216.8 N/A 8.3 1086 1080 736 1256.0 N/A N/A 26.8 N/A 259 N/A
01/25 1217.1 N/A 8.5 1081 1080 584 1251.0 N/A N/A 29.2 N/A 248 N/A
01/24 1217.5 N/A 8.8 1080 1080 549 1253.0 N/A N/A 28.6 543.8 248 N/A
01/23 1218.0 N/A 9.4 1083 1080 547 1255.0 N/A N/A 29.4 N/A 252 N/A
01/22 1218.4 N/A 9.8 1095 1090 673 1259.0 N/A N/A 30.4 N/A 252 N/A
01/21 1218.8 N/A 9.9 1134 1090 559 1258.0 N/A N/A 30.2 N/A 255 N/A
01/20 1219.3 N/A 10.2 1096 1090 667 1264.0 N/A N/A 27.5 542.5 259 N/A
01/19 1219.7 N/A 10.3 1044 1040 764 1264.0 N/A N/A 26.9 542.5 266 N/A
01/18 1219.9 N/A 10.5 1046 1040 734 1262.0 N/A N/A 37.7 542.5 270 N/A
01/17 1220.2 N/A 10.5 1059 1040 806 1263.0 N/A N/A 29.5 542.5 263 N/A
01/16 1220.4 N/A 10.5 1046 1040 1314 1277.0 N/A N/A 29.5 542.5 1300 N/A
01/15 1220.2 N/A 10.1 984 970 1797 1282.0 N/A N/A 29.3 543.2 1540 N/A
01/14 1219.6 N/A 9.2 983 970 2822 1290.0 N/A N/A 28.7 543.9 1540 N/A
NY Power Authority Comments : The Hinckley release rate returned to the Operating Diagram release of 970 cfs Tuesday (1/14) morning.
01/13 1218.1 N/A 7.4 1799 970 5519 1306.0 N/A N/A 28.5 544.6 1540 N/A
01/12 1214.9 N/A 4.0 1482 1000 7078 1182.0 N/A N/A 26.4 544.5 1560 N/A
NY Power Authority Comments : The Outlet #4 valve and bypass valve were closed Sunday (1/12) at 10:09 as per the Canal Corporation update. The deviation of 1,800 remained in effect through Monday (1/13).
01/11 1209.7 N/A -1.6 1820 1000 -656 992.0 N/A N/A 26.6 543.6 1540 N/A
01/10 1212.1 N/A 0.6 2638 1000 -166 1081.0 N/A N/A 28.3 544.4 1520 N/A
01/09 1214.7 N/A 3.0 1755 1000 222 1211.0 N/A N/A 29.2 545.4 955 N/A
NY Power Authority Comments : The Canal Corporation has authorized an increase of the release rate to 3,200 cfs until further notice. On Jan 9, 2020 at 1009, the Outlet #4 valve was opened to 48 inches and the bypass valve was opened.
01/08 1216.0 N/A 4.2 1797 980 710 1315.0 N/A N/A 27.8 545.8 935 N/A
01/07 1217.0 N/A 5.0 1467 980 942 1317.0 N/A N/A 27.6 546.3 940 N/A
NY Power Authority Comments : The scheduled releases for January 7th, January 8th and January 9th, 2020, were increased by 200 cfs in order to "make up" for the deviation from the Operating Diagram that took effect from Nov 18 to Nov 20. Additionally, the Canal Corporation authorized a further deviation to a release rate of 1,800 cfs which took effect on Tuesday, Jan 7th at 1000.
01/06 1217.5 N/A 5.3 989 980 1156 1303.0 N/A N/A 29.6 546.6 940 N/A
01/05 1217.3 N/A 5.0 990 980 1760 1286.0 N/A N/A N/A 546.9 950 0
01/04 1216.7 N/A 4.4 992 980 1158 1248.0 N/A N/A N/A 546.8 347 0
01/03 1216.6 N/A 4.3 988 980 811 1233.0 N/A N/A N/A 546.6 303 0
01/02 1216.8 N/A 4.5 986 980 780 1229.0 N/A N/A N/A N/A N/A N/A
01/01 1217.0 N/A 4.6 988 0 1068 1230.0 N/A N/A N/A N/A N/A N/A

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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.