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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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2021 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)
05/07 1220.5 -1.5 -3.8 1207 0 1086 1255.0 748 200 N/A 549.9 234 0
05/06 1220.6 -1.4 -3.8 1206 0 1330 1261.0 913 277 27.7 549.9 818 0
05/05 1220.5 -1.4 -3.8 1201 1200 1172 1252.0 824 257 28.1 550.0 852 0
05/04 1220.6 -1.4 -3.8 1203 1200 1142 1247.0 772 214 29.0 550.2 525 0
05/03 1220.7 -1.4 -3.8 1202 1200 1419 1245.0 947 259 27.6 550.3 464 0
05/02 1220.5 -1.5 -3.8 1281 1280 1833 1241.0 1220 292 26.4 550.2 309 0
05/01 1220.1 -1.9 -4.0 1294 1280 2893 1244.0 1720 490 28.0 550.1 285 0
04/30 1218.8 N/A -5.0 1291 1280 2789 1238.0 1850 569 29.1 549.8 225 0
04/29 1217.6 N/A -6.2 1298 1280 1354 1232.0 1080 218 27.8 549.5 201 0
04/28 1217.6 N/A -6.0 1317 1400 672 1305.0 498 85 29.6 549.4 198 0
04/27 1218.2 N/A -5.2 1402 1400 601 1485.0 436 70 29.2 549.4 201 0
04/26 1218.8 N/A -4.4 1384 1400 662 1626.0 502 84 29.1 549.5 201 0
04/25 1219.4 N/A -3.3 1391 1400 782 1899.0 N/A 100 28.6 549.6 201 0
04/24 1220.0 N/A -2.4 1399 1400 785 2129.0 620 123 28.1 549.6 201 0
04/23 1220.5 N/A -1.3 1402 1400 812 2224.0 553 121 28.1 549.7 201 0
04/22 1221.0 N/A 0.0 1398 1400 896 2251.0 647 154 30.2 549.7 201 0
04/21 1221.4 N/A 1.1 1398 1400 955 2256.0 697 131 30.9 549.7 198 0
04/20 1221.7 N/A 1.9 1395 1400 885 2244.0 727 98 29.6 549.7 198 0
04/19 1222.2 N/A 3.0 1399 1400 1109 2229.0 868 117 29.8 549.8 198 0
04/18 1222.4 N/A 3.6 1401 1400 1333 2205.0 1010 152 27.2 N/A N/A N/A
04/17 1222.5 N/A 4.3 1402 1400 1524 2173.0 1160 204 27.4 549.8 203 0
04/16 1222.4 N/A 5.1 1401 1400 1301 2137.0 1030 181 29.5 549.8 203 0
04/15 1222.5 N/A 6.1 1403 1400 919 2111.0 731 92 29.4 549.8 203 0
04/14 1222.9 N/A 7.3 1407 1400 1080 2100.0 890 101 30.0 549.8 203 0
04/13 1223.2 N/A 8.3 1408 1400 1435 2068.0 1110 132 28.9 549.9 203 0
04/12 1223.2 N/A 9.0 1405 1400 1271 2057.0 1080 111 28.9 549.9 203 0
04/11 1223.3 N/A 9.8 1394 1400 1130 2053.0 941 92 28.6 549.9 203 0
04/10 1223.5 N/A 10.7 1397 1400 1196 2038.0 1030 108 28.0 549.9 209 0
04/09 1223.7 N/A 11.3 1399 1400 1361 2010.0 1090 124 28.4 549.9 209 0
04/08 1223.7 N/A 12.0 2113 1400 1945 1973.0 1010 136 30.9 549.9 209 0
04/07 1223.9 N/A 13.0 1719 1770 1254 1917.0 886 144 30.0 550.0 209 0
04/06 1224.2 N/A 14.1 1237 1770 1067 1883.0 844 161 28.8 550.0 248 0
04/05 1224.4 N/A 15.2 1781 1770 1013 1857.0 791 173 30.2 550.0 262 0
04/04 1225.0 N/A 16.8 1454 1400 1080 1833.0 845 193 27.5 550.0 262 0
04/03 1225.3 N/A 18.2 1770 1400 1294 1807.0 1010 233 28.6 549.9 652 0
04/02 1225.6 N/A 19.4 2330 1400 1951 1776.0 1330 337 27.5 550.1 812 0
04/01 1225.9 N/A 20.6 2662 1400 2689 1724.0 1820 462 27.5 550.3 950 0
03/31 1225.9 N/A 21.5 2295 1040 2622 1646.0 1700 447 27.5 550.5 1020 0
03/30 1225.7 N/A 22.2 1280 1040 3529 1571.0 2110 714 29.7 550.5 788 0
03/29 1224.1 N/A 21.3 1015 1040 6070 1464.0 4220 1070 29.8 550.1 348 0
03/28 1220.2 N/A 18.4 562 560 4838 1271.0 2920 826 28.7 548.3 242 0
03/27 1216.7 N/A 15.7 572 560 8869 1119.0 5550 1180 28.4 547.8 245 0
03/26 1209.0 N/A 8.4 587 560 7677 833.0 5660 1090 30.2 545.8 251 0
03/25 1201.1 N/A 0.9 618 560 3621 586.0 2430 763 30.7 544.2 234 0
03/24 1197.2 N/A -2.8 495 630 1628 473.0 1180 416 29.6 542.8 222 0
03/23 1195.6 N/A -4.2 609 630 1060 428.0 N/A 275 30.0 542.1 228 0
03/22 1195.0 N/A -4.7 627 630 585 401.0 471 186 29.1 541.5 222 0
03/21 1195.1 N/A -4.5 671 700 431 390.0 322 127 28.9 541.2 214 0
03/20 1195.5 N/A -3.9 677 700 400 384.0 299 119 31.2 541.1 209 0
03/19 1195.9 N/A -3.6 683 700 368 378.0 304 141 30.2 541.0 211 0
03/18 1196.4 N/A -2.9 647 700 447 375.0 -999999 -999999 31.8 540.9 211 0
03/17 1196.7 N/A -2.4 566 550 503 369.0 339 136 29.7 540.8 211 0
03/16 1196.8 N/A -2.2 567 550 590 361.0 432 166 29.4 540.7 211 0
03/15 1196.8 N/A -2.1 49 550 141 349.0 508 207 29.6 540.6 211 0
03/14 1196.8 N/A -2.2 551 530 1106 350.0 694 311 30.7 540.5 220 0
03/13 1196.1 N/A -2.6 542 530 1133 320.0 848 395 31.1 540.0 228 0
03/12 1195.2 N/A -3.3 305 530 701 288.0 N/A 277 30.8 539.0 242 0
03/11 1194.7 N/A -4.0 212 0 348 272.0 -999999 125 31.0 538.4 198 0
03/10 1194.5 N/A -4.2 212 510 251 267.0 -999999 78 31.6 538.3 193 0
03/09 1194.5 N/A -4.2 212 510 251 265.0 -999999 72 30.6 538.4 196 0
03/08 1194.5 N/A -4.1 212 510 251 264.0 -999999 70 29.8 538.5 196 0
03/07 1194.5 N/A -4.2 211 470 282 265.0 -999999 79 30.6 538.5 196 0
03/06 1194.4 N/A -4.1 211 470 282 264.0 -999999 87 30.6 538.6 196 0
03/05 1194.3 N/A -4.2 211 470 313 261.0 -999999 99 31.1 538.6 196 0
03/04 1194.2 N/A -4.6 210 470 344 257.0 -999999 116 30.8 538.7 196 0
03/03 1194.0 N/A -5.1 209 410 404 252.0 -999999 140 31.1 538.5 201 0
03/02 1193.8 N/A -5.7 208 410 355 246.0 -999999 157 29.9 538.4 201 0
03/01 1193.6 N/A -6.0 207 410 369 241.0 -999999 159 30.2 538.4 196 0
02/28 1193.3 N/A -6.5 206 400 307 235.0 -999999 155 30.2 538.3 196 0
02/27 1193.2 N/A -6.7 206 400 291 232.0 -999999 117 30.2 538.3 193 0
02/26 1193.1 N/A -7.0 206 400 291 229.0 -999999 120 32.7 538.4 193 0
02/25 1193.0 N/A -7.4 205 400 275 227.0 -999999 125 32.4 538.4 193 0
02/24 1192.9 N/A -7.7 205 390 274 225.0 -999999 98 31.0 538.5 193 0
02/23 1192.9 N/A -7.8 205 390 229 221.0 -999999 87 30.2 538.6 193 0
02/22 1192.9 N/A -7.9 205 390 259 220.0 -999999 68 31.0 538.6 193 0
02/21 1192.8 N/A -8.3 205 380 259 219.0 -999999 70 30.6 538.7 193 0
02/20 1192.8 N/A -8.7 205 380 259 219.0 -999999 75 31.5 538.8 193 0
02/19 1192.7 N/A -9.1 204 380 258 217.0 -999999 75 31.3 538.9 193 0
02/18 1192.7 N/A -9.3 204 380 227 218.0 -999999 79 31.2 539.0 193 0
02/17 1192.7 N/A -9.4 204 440 258 219.0 -999999 87 32.2 539.1 193 0
02/16 1192.6 N/A -9.8 204 440 288 221.0 -999999 68 31.0 539.1 193 0
02/15 1192.5 N/A -10.2 203 580 242 220.0 -999999 55 30.0 539.2 193 0
02/14 1192.5 N/A -10.6 203 580 242 224.0 -999999 55 31.3 539.3 193 0
02/13 1192.5 N/A -11.0 406 580 160 224.0 -999999 54 31.2 539.4 N/A 0
NY Power Authority Comments : As of 2/13/21 HB 13 Hinckley Reservoir release rate will be reduced from the Hinckley Reservoir Operating Diagram to 200 cfs
02/12 1192.9 N/A -10.9 595 580 206 228.0 -999999 56 30.6 539.5 N/A 0
02/11 1193.6 N/A -10.6 581 580 166 231.0 -999999 62 30.5 539.6 193 0
02/10 1194.3 N/A -10.4 657 660 232 236.0 -999999 66 32.1 539.7 193 0
02/09 1194.9 N/A -10.1 657 660 188 238.0 N/A 61 31.3 539.8 N/A 0
02/08 1195.7 N/A -9.7 664 660 199 242.0 259 58 31.4 539.9 N/A 0
02/07 1196.4 N/A -9.4 691 700 232 242.0 291 60 30.9 540.0 196 0
02/06 1197.1 N/A -9.1 698 700 281 247.0 204 63 33.0 540.1 N/A 0
02/05 1197.7 N/A -8.8 698 700 255 252.0 200 57 32.6 540.2 N/A 0
02/04 1198.3 N/A -8.4 703 700 195 262.0 205 53 32.8 540.2 N/A 0
02/03 1199.0 N/A -7.9 744 750 187 275.0 208 54 31.2 540.3 193 0
02/02 1199.8 N/A -7.3 737 750 186 292.0 210 47 31.5 540.4 193 0
02/01 1200.5 N/A -6.9 738 750 214 317.0 366 44 31.3 540.4 196 0
01/31 1201.2 N/A -6.4 698 780 203 336.0 387 42 31.4 540.5 196 0
01/30 1201.8 N/A -6.1 777 780 210 352.0 314 43 31.7 540.6 196 0
01/29 1202.5 N/A -5.6 776 780 198 372.0 270 47 32.1 540.7 196 0
01/28 1203.2 N/A -5.0 776 780 207 390.0 266 50 31.0 540.8 196 0
01/27 1203.9 N/A -4.5 837 840 237 418.0 272 50 33.8 540.9 196 0
01/26 1204.6 N/A -3.9 837 840 202 465.0 324 46 33.9 540.9 196 0
01/25 1205.4 N/A -3.2 838 840 168 562.0 N/A N/A 31.1 540.9 196 0
01/24 1206.1 N/A -2.6 862 870 202 797.0 N/A N/A 31.2 541.1 196 0
01/23 1206.9 N/A -1.7 868 870 219 1062.0 N/A N/A 31.9 541.2 196 0
01/22 1207.6 N/A -1.0 866 870 277 1068.0 N/A N/A 30.7 541.2 196 0
01/21 1208.2 N/A -0.7 866 870 195 1070.0 N/A N/A 30.5 541.2 196 0
01/20 1208.9 N/A -0.2 910 910 277 1075.0 N/A N/A 31.2 541.3 196 0
01/19 1209.6 N/A 0.3 912 910 255 1079.0 N/A N/A 30.6 541.3 196 0
01/18 1210.2 N/A 0.8 913 910 310 1083.0 N/A N/A 30.6 541.3 196 0
01/17 1210.8 N/A 1.2 943 940 280 1083.0 N/A N/A 31.0 541.3 196 0
01/16 1211.5 N/A 1.6 946 940 350 1086.0 N/A N/A 31.5 541.3 196 0
01/15 1212.1 N/A 2.0 938 940 256 1088.0 N/A N/A 30.5 541.3 206 0
01/14 1212.8 N/A 2.4 942 940 277 1092.0 N/A N/A 31.7 541.4 206 0
01/13 1213.4 N/A 2.7 981 980 278 1102.0 N/A N/A 32.5 541.4 206 0
01/12 1214.0 N/A 3.1 978 980 320 1119.0 N/A N/A 32.7 541.5 209 0
01/11 1214.7 N/A 3.5 982 980 288 1125.0 N/A N/A 32.4 541.5 211 0
01/10 1215.3 N/A 3.8 1007 1010 304 1128.0 N/A N/A 33.2 541.5 211 0
01/09 1215.9 N/A 4.2 1011 1010 213 1130.0 N/A N/A 33.2 541.6 217 0
01/08 1216.6 N/A 4.7 1008 1010 371 1137.0 N/A N/A 31.1 541.6 222 0
01/07 1217.2 N/A 5.2 1012 1010 426 1139.0 N/A N/A 31.3 541.7 1220 0
01/06 1217.7 N/A 5.5 1028 1030 572 1137.0 N/A N/A 32.4 542.5 1220 0
01/05 1218.1 N/A 5.8 1031 1030 582 1136.0 N/A N/A 32.1 543.2 1220 0
01/04 1218.5 N/A 6.2 1032 1030 698 1140.0 N/A N/A 31.5 544.1 1230 0
01/03 1218.8 N/A 6.5 1040 1030 944 1140.0 N/A N/A 31.8 N/A 1240 0
01/02 1218.9 N/A 6.6 1043 1030 767 1135.0 N/A N/A 32.6 545.2 1240 0
01/01 1219.2 N/A 6.8 1033 1030 696 1142.0 N/A N/A 32.8 N/A 1240 0

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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.