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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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2022 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)
06/25 N/A N/A N/A N/A N/A N/A 698.0 1170 165 N/A N/A N/A N/A
06/24 N/A N/A N/A N/A N/A N/A 683.0 2010 412 29.6 N/A N/A N/A
06/23 1221.3 3.2 -1.4 580 580 1820 670.0 1600 308 32.5 N/A N/A N/A
06/22 1220.3 2.0 -2.4 919 910 554 622.0 470 26 29.9 N/A N/A N/A
06/21 1220.6 2.1 -2.1 922 910 244 621.0 191 25 31.1 N/A N/A N/A
06/20 1221.2 2.6 -1.7 923 910 364 628.0 211 28 29.4 N/A N/A N/A
06/19 1221.7 2.9 -1.3 1077 1070 291 635.0 246 33 29.2 N/A N/A N/A
06/18 1222.3 3.3 -0.9 1077 1070 479 649.0 283 39 29.2 N/A N/A N/A
06/17 1222.8 3.6 -0.5 965 1070 453 655.0 351 48 28.4 N/A N/A N/A
06/16 1223.2 3.9 0.0 1077 1070 463 666.0 378 50 31.3 N/A N/A N/A
06/15 1223.7 4.2 0.4 670 660 509 686.0 459 53 31.2 N/A N/A N/A
06/14 1223.9 4.2 0.6 592 660 790 684.0 700 71 29.3 N/A N/A N/A
06/13 1223.7 3.8 0.3 668 660 1061 669.0 994 95 29.2 N/A N/A N/A
06/12 1223.5 3.4 0.0 543 530 902 646.0 632 104 29.7 N/A N/A N/A
06/11 1223.2 3.0 -0.4 540 530 1154 627.0 941 169 29.7 N/A N/A N/A
06/10 1222.8 2.4 -0.9 448 530 2005 597.0 1400 323 28.8 N/A N/A N/A
06/09 1221.6 1.1 -2.1 389 530 2067 545.0 1450 355 30.6 N/A N/A N/A
06/08 1220.3 -0.4 -3.4 352 540 2021 492.0 1520 277 31.5 N/A N/A N/A
06/07 1219.0 -1.9 -4.9 347 540 382 441.0 157 36 28.8 N/A N/A N/A
06/06 1219.0 -2.1 -5.0 346 540 232 446.0 155 31 31.8 N/A N/A N/A
06/05 1219.1 -2.2 -5.0 348 540 263 463.0 183 38 31.4 N/A N/A N/A
06/04 1219.2 -2.3 -5.0 333 540 338 479.0 238 52 29.4 N/A N/A N/A
06/03 1219.2 -2.4 -5.1 344 540 499 499.0 349 90 30.3 N/A N/A N/A
06/02 1219.2 -2.7 -5.1 355 540 778 507.0 476 185 30.6 N/A N/A N/A
06/01 1218.8 -3.2 -5.4 354 550 389 505.0 180 N/A 30.4 N/A N/A N/A
05/31 1218.8 -3.2 -5.4 353 550 206 516.0 163 32 32.9 549.7 173 0
05/30 1219.0 -3.1 -5.3 355 550 297 535.0 186 38 29.8 549.7 173 0
05/29 1219.0 -3.0 -5.2 356 600 328 552.0 217 48 31.3 549.7 173 0
05/28 1219.1 -2.9 -5.2 357 600 329 575.0 208 48 32.0 549.7 173 0
05/27 1219.2 -2.8 -5.1 357 600 329 604.0 195 43 32.6 549.6 N/A 0
05/26 1219.2 -2.8 -5.1 358 600 270 640.0 215 47 34.2 549.7 N/A 0
05/25 1219.3 -2.7 -5.1 358 660 300 694.0 243 55 29.8 549.7 173 0
05/24 1219.4 -2.6 -5.0 357 660 389 769.0 288 68 30.8 549.8 176 0
05/23 1219.4 -2.6 -5.0 357 660 509 838.0 313 80 31.1 549.8 176 0
05/22 1219.3 -2.7 -5.1 356 730 448 919.0 301 81 30.2 549.8 173 0
05/21 1219.2 -2.8 -5.3 354 730 596 985.0 356 107 30.4 549.8 N/A 0
05/20 1219.0 -3.0 -5.4 389 730 690 1012.0 418 158 29.4 549.8 N/A 0
05/19 1218.8 -3.2 -5.7 605 730 666 1034.0 386 125 29.3 549.7 N/A 0
05/18 1218.8 -3.2 -5.7 352 800 770 1057.0 N/A 175 31.5 549.7 N/A 0
05/17 1218.5 -3.5 -6.0 349 800 1087 1069.0 671 318 31.8 549.7 N/A 0
05/16 1217.9 -4.1 -6.6 349 800 440 1077.0 321 86 30.8 549.5 N/A 0
05/15 1217.9 -4.1 -6.7 349 930 340 1118.0 226 42 32.5 549.5 176 0
05/14 1217.9 -4.1 -6.7 350 930 382 1171.0 223 40 30.6 549.4 N/A 0
05/13 1217.9 -4.1 -6.6 350 930 323 1211.0 235 43 32.2 549.4 N/A 0
05/12 1218.0 -4.1 -6.5 529 930 238 1252.0 254 46 31.5 549.5 N/A 0
NY Power Authority Comments : Deviation from OD to 340 cfs at hb 12
05/11 1221.2 -3.8 -6.2 1110 1110 461 1297.0 276 52 31.5 549.5 173 0
05/10 1218.8 -3.2 -5.5 1114 1110 488 1339.0 303 59 31.3 549.5 173 0
05/09 1219.3 -2.7 -4.9 1120 1110 487 1421.0 338 67 30.0 549.5 173 0
05/08 1219.9 -2.1 -4.4 1325 1330 532 1590.0 386 74 30.1 549.5 173 0
05/07 1220.5 -1.5 -3.8 1335 1330 718 1951.0 449 92 30.0 549.5 173 0
05/06 1221.0 -0.9 -3.3 1318 1330 758 2024.0 530 121 29.7 549.5 176 0
05/05 1221.5 -0.5 -2.9 1337 1330 927 2031.0 619 187 29.6 549.4 222 0
05/04 1221.8 -0.1 -2.5 1389 1400 756 2035.0 479 126 30.6 549.3 222 0
05/03 1222.4 0.4 -2.0 1394 1400 723 2052.0 465 101 31.9 549.2 273 0
05/02 1222.9 0.9 -1.4 1398 1400 721 2078.0 475 102 30.6 549.3 280 0
05/01 1223.4 1.4 -0.7 1417 1420 765 2124.0 526 101 30.4 549.3 284 0
04/30 1223.9 N/A 0.1 1424 1420 794 2170.0 608 121 29.7 549.4 284 0
04/29 1224.4 N/A 0.6 1427 1420 1038 2176.0 739 157 30.8 549.4 284 0
04/28 1224.7 N/A 1.1 1429 1420 1175 2170.0 922 206 30.7 549.4 287 0
04/27 1225.0 N/A 1.6 1407 1400 1434 2164.0 1120 263 31.7 N/A N/A N/A
NY Power Authority Comments : Revert back to Operating Diagram(1400 cfs) from 100 cfs at hb 0
04/26 1225.0 N/A 1.7 1797 1400 1891 2156.0 1360 370 31.3 N/A N/A N/A
04/25 1224.9 N/A 2.1 1811 1400 2533 2149.0 N/A 583 29.4 N/A N/A N/A
04/24 1224.4 N/A 2.0 1820 1400 2471 2131.0 1670 608 31.5 N/A N/A N/A
04/23 1223.9 N/A 2.1 1810 1400 2941 2113.0 1900 723 30.6 N/A N/A N/A
04/22 1223.1 N/A 2.1 1805 1400 2410 2067.0 1700 594 31.0 N/A N/A N/A
04/21 1222.7 N/A 2.3 1800 1400 1411 2047.0 939 356 30.4 N/A N/A N/A
04/20 1223.0 N/A 3.2 1809 1400 1353 2092.0 892 290 30.0 N/A N/A N/A
04/19 1223.4 N/A 4.2 1807 1400 1347 2205.0 929 246 19.1 N/A N/A N/A
04/18 1223.7 N/A 4.9 1806 1400 1147 2434.0 909 195 31.8 N/A N/A N/A
04/17 1224.2 N/A 6.0 1801 1400 1333 2558.0 1060 224 29.8 N/A N/A N/A
04/16 1224.6 N/A 7.3 1804 1400 1666 2582.0 1220 231 31.2 N/A N/A N/A
04/15 1224.7 N/A 8.3 1817 1400 1910 2562.0 1460 295 31.3 N/A N/A N/A
04/14 1224.7 N/A 9.1 1817 1400 1579 2520.0 1260 238 30.1 N/A N/A N/A
04/13 1224.9 N/A 10.0 1820 1400 1581 2490.0 1280 251 30.3 N/A N/A N/A
04/12 1225.1 N/A 10.9 1945 1400 1571 2459.0 1230 292 31.1 N/A N/A N/A
04/11 1225.4 N/A 11.8 2547 1400 1732 2427.0 1360 332 27.8 N/A N/A N/A
04/10 1226.0 N/A 13.2 4044 1400 2946 2397.0 1940 593 30.9 N/A N/A N/A
04/09 1226.8 N/A 14.5 6484 1400 5544 2335.0 3420 1030 29.3 N/A N/A N/A
04/08 1227.4 N/A 15.8 4015 1400 11370 2196.0 9310 1520 31.3 N/A N/A N/A
04/07 1222.1 N/A 11.2 1809 1400 2903 1887.0 3060 458 30.2 N/A N/A N/A
04/06 1221.2 N/A 11.2 1799 1400 981 1862.0 825 186 31.4 N/A N/A N/A
04/05 1221.9 N/A 12.7 1810 1400 1045 1865.0 794 201 30.7 N/A N/A N/A
04/04 1222.5 N/A 14.3 1791 1400 1274 1847.0 924 237 32.2 N/A N/A N/A
04/03 1222.9 N/A 15.8 1795 1400 1500 1814.0 1110 281 30.7 N/A N/A N/A
04/02 1223.2 N/A 17.0 1801 1400 2086 1770.0 1410 451 31.7 N/A N/A N/A
04/01 1223.0 N/A 17.6 1819 1400 2135 1719.0 1670 610 31.4 N/A N/A N/A
03/31 1222.7 N/A 18.3 1808 1400 994 1648.0 691 159 31.0 N/A N/A N/A
03/30 1223.4 N/A 19.9 1598 1400 840 1642.0 654 154 32.0 N/A N/A N/A
NY Power Authority Comments : Deviation from 1400 cfs to 1800 cfs until further notice
03/29 1224.0 N/A 21.3 1416 1400 1013 1663.0 769 193 31.0 N/A N/A N/A
03/28 1224.3 N/A 22.5 1418 1400 1177 1677.0 945 226 30.5 N/A N/A N/A
03/27 1224.5 N/A 23.5 1416 1400 1703 1691.0 1220 303 31.4 N/A N/A N/A
03/26 1224.3 N/A 23.7 1413 1400 1993 1730.0 1430 388 32.6 N/A N/A N/A
03/25 1223.9 N/A 23.7 1409 1400 1921 1841.0 1370 394 30.0 N/A N/A N/A
03/24 1223.5 N/A 23.5 1408 1400 1561 2016.0 1160 304 32.3 N/A N/A N/A
03/23 1223.4 N/A 23.5 1355 1400 1798 2017.0 1300 323 31.0 N/A N/A N/A
03/22 1223.1 N/A 23.4 1412 1400 2776 2020.0 1780 540 32.6 N/A N/A N/A
03/21 1222.1 N/A 22.5 1412 1400 4738 2021.0 2810 911 31.9 N/A N/A N/A
03/20 1219.4 N/A 20.1 1417 1400 8215 2027.0 5160 1340 31.6 N/A N/A N/A
03/19 1213.6 N/A 14.2 1409 1400 4875 1941.0 3430 910 33.0 N/A N/A N/A
03/18 1210.4 N/A 11.1 1396 1400 2038 1789.0 1560 562 32.0 N/A N/A N/A
03/17 1209.8 N/A 10.7 1387 1400 1064 1728.0 976 380 34.2 N/A N/A N/A
03/16 1210.1 N/A 11.0 1399 1400 672 1700.0 613 269 32.1 N/A N/A N/A
03/15 1210.8 N/A 11.8 1399 1400 659 1688.0 516 228 34.1 N/A N/A N/A
03/14 1211.6 N/A 12.8 1398 1400 671 1677.0 558 240 32.0 N/A N/A N/A
03/13 1212.3 N/A 13.5 1335 1400 587 1662.0 599 243 31.0 N/A N/A N/A
03/12 1213.0 N/A 14.4 1389 1400 852 1650.0 671 263 33.4 N/A N/A N/A
03/11 1213.6 N/A 14.9 1401 1400 1075 1628.0 825 296 33.2 N/A N/A N/A
03/10 1213.9 N/A 15.2 1536 1400 1365 1598.0 1050 386 32.1 N/A N/A N/A
03/09 1213.8 N/A 15.1 1406 1400 2124 1556.0 1380 585 35.0 N/A N/A N/A
03/08 1213.2 N/A 14.5 1599 1400 2150 1493.0 1630 723 32.0 N/A N/A N/A
NY Power Authority Comments : Reverting Back to Operating Diagram as of hb 12; 1800 cfs to 1400 cfs
03/07 1212.7 N/A 14.0 1791 1400 1073 1427.0 1020 452 35.6 N/A N/A N/A
03/06 1213.4 N/A 14.9 1800 1400 500 1399.0 488 230 34.0 N/A N/A N/A
03/05 1214.6 N/A 16.1 1801 1400 279 1392.0 -999999 -999999 32.2 N/A N/A N/A
03/04 0.0 N/A -1198.8 -1756 1400 176 1389.0 -999999 -999999 32.7 N/A N/A N/A
03/03 1217.2 N/A 18.1 1626 1400 573 1387.0 -999999 -999999 34.1 N/A N/A N/A
03/02 1218.1 N/A 18.7 1419 1400 -18 1373.0 -999999 -999999 32.4 N/A N/A N/A
03/01 1219.3 N/A 19.7 1396 1400 827 1377.0 -999999 -999999 34.4 N/A N/A N/A
02/28 1219.8 N/A 20.0 1389 1400 1461 1355.0 N/A -999999 31.6 N/A N/A N/A
02/27 1219.8 N/A 19.9 1405 1070 1429 1310.0 979 349 31.9 N/A N/A N/A
02/26 1219.8 N/A 19.6 1407 1070 1613 1265.0 1210 439 34.9 N/A N/A N/A
02/25 1219.6 N/A 19.2 1414 1070 2873 1215.0 1800 743 33.1 N/A N/A N/A
02/24 1218.4 N/A 17.8 1411 1070 5325 1124.0 3200 1190 33.8 N/A N/A N/A
NY Power Authority Comments : Deviate from Operating Diagram from 520 cfs to 1400 cfs
02/23 1215.1 N/A 14.4 1429 520 7177 953.0 5280 1240 32.1 N/A N/A N/A
02/22 1209.8 N/A 9.0 1417 520 1588 721.0 1130 407 35.2 N/A N/A N/A
02/21 1209.6 N/A 8.5 1083 520 1885 673.0 1350 491 32.7 N/A N/A N/A
NY Power Authority Comments : Release adjusted from 520 cfs to 1400 cfs for 2/21 - 2/23 to mitigate spilling risk from forecasted inflows.
02/20 1208.8 N/A 7.3 613 630 2794 616.0 1780 699 30.6 N/A N/A N/A
02/19 1206.6 N/A 4.8 642 630 4913 530.0 3130 1040 31.9 N/A N/A N/A
02/18 1201.8 N/A -0.2 612 630 5639 376.0 4490 930 29.0 N/A N/A N/A
02/17 1195.0 N/A -7.0 602 630 331 199.0 -999999 -999999 33.0 N/A N/A N/A
02/16 1195.5 N/A -6.9 663 700 184 195.0 -999999 -999999 33.8 N/A N/A N/A
02/15 1196.2 N/A -6.5 666 700 244 203.0 N/A -999999 33.1 N/A N/A N/A
02/14 1196.8 N/A -6.3 666 700 305 203.0 -999999 -999999 32.6 N/A N/A N/A
02/13 1197.4 N/A -6.1 705 710 338 207.0 -999999 -999999 29.9 N/A N/A N/A
02/12 1197.9 N/A -5.9 703 710 220 214.0 -999999 -999999 33.0 N/A N/A N/A
02/11 1198.6 N/A -5.6 703 710 228 228.0 -999999 -999999 31.1 N/A N/A N/A
02/10 1199.3 N/A -5.3 715 710 173 237.0 -999999 -999999 30.1 N/A N/A N/A
02/09 1200.0 N/A -5.0 806 800 173 247.0 -999999 -999999 35.4 N/A N/A N/A
02/08 1200.8 N/A -4.6 799 800 130 261.0 -999999 -999999 32.5 N/A N/A N/A
02/07 1201.7 N/A -4.1 795 800 212 277.0 -999999 -999999 32.7 N/A N/A N/A
02/06 1202.4 N/A -3.7 832 840 194 287.0 -999999 -999999 30.5 N/A N/A N/A
02/05 1203.2 N/A -3.3 837 840 207 301.0 -999999 -999999 31.6 N/A N/A N/A
02/04 1204.0 N/A -2.8 834 840 299 317.0 -999999 -999999 32.1 N/A N/A N/A
02/03 1204.6 N/A -2.3 835 840 180 329.0 -999999 -999999 30.2 N/A N/A N/A
02/02 1205.4 N/A -1.8 899 910 141 343.0 -999999 -999999 35.3 N/A N/A N/A
02/01 1206.2 N/A -1.2 906 910 131 370.0 -999999 -999999 33.9 N/A N/A N/A
01/31 1207.1 N/A -0.5 905 910 112 405.0 -999999 -999999 32.9 N/A N/A N/A
01/30 1207.9 N/A 0.0 991 980 156 429.0 -999999 -999999 31.0 N/A N/A N/A
01/29 1208.8 N/A 0.7 1126 980 127 446.0 -999999 -999999 31.4 N/A N/A N/A
01/28 1209.8 N/A 1.5 1393 980 65 464.0 -999999 -999999 29.9 N/A N/A N/A
01/27 1211.1 N/A 2.7 1382 980 118 483.0 -999999 -999999 33.1 N/A N/A N/A
01/26 1212.4 N/A 3.8 1400 1050 155 503.0 -999999 -999999 31.9 N/A N/A N/A
01/25 1213.5 N/A 4.9 1065 1050 197 527.0 -999999 -999999 33.3 N/A N/A N/A
01/24 1214.3 N/A 5.6 1046 1050 191 554.0 -999999 -999999 28.2 N/A N/A N/A
01/23 1215.1 N/A 6.5 1387 1400 165 576.0 -999999 -999999 31.1 N/A N/A N/A
01/22 1216.2 N/A 7.6 1393 1400 187 593.0 -999999 -999999 28.7 N/A N/A N/A
01/21 1217.3 N/A 8.4 1291 1400 204 605.0 -999999 -999999 31.4 N/A N/A N/A
01/20 1218.2 N/A 9.1 1396 1400 295 620.0 -999999 -999999 30.6 N/A N/A N/A
01/19 1219.1 N/A 9.8 1398 1400 334 635.0 -999999 -999999 31.1 N/A N/A N/A
01/18 1220.0 N/A 10.6 1407 1400 201 653.0 -999999 -999999 30.8 N/A N/A N/A
01/17 1221.0 N/A 11.3 1389 1400 413 680.0 -999999 -999999 28.2 N/A N/A N/A
01/16 1221.8 N/A 11.8 1376 1400 258 711.0 -999999 -999999 27.7 N/A N/A N/A
01/15 1222.6 N/A 12.5 1390 1400 415 750.0 -999999 -999999 30.5 N/A N/A N/A
01/14 1223.4 N/A 13.0 1481 1400 559 778.0 -999999 -999999 29.8 N/A N/A N/A
NY Power Authority Comments : 1/14 - Jarvis Units 1 & 2 Return to Service. Revert back to the Operating Diagram.
01/13 1224.1 N/A 13.4 716 1400 640 793.0 -999999 -999999 31.1 N/A N/A N/A
01/12 1224.2 N/A 13.3 626 1410 485 830.0 -999999 -999999 29.1 N/A N/A N/A
01/11 1224.3 N/A 13.1 717 1410 476 925.0 -999999 -999999 27.8 N/A N/A N/A
01/10 1224.5 N/A 13.0 717 1410 608 1088.0 N/A -999999 30.1 N/A N/A N/A
01/09 1224.6 N/A 12.9 718 1500 608 1133.0 347 152 28.8 N/A N/A N/A
01/08 1224.7 N/A 12.8 719 1500 510 1151.0 303 149 28.3 N/A N/A N/A
01/07 1224.9 N/A 12.8 720 1500 610 1186.0 396 146 29.4 N/A N/A N/A
01/06 1225.0 N/A 12.8 724 1500 680 1256.0 447 176 29.3 N/A N/A N/A
01/05 1225.0 N/A 12.7 735 1400 658 1407.0 N/A N/A 29.9 N/A N/A N/A
01/04 1225.1 N/A 12.8 808 1400 597 1434.0 489 198 29.1 N/A N/A N/A
01/03 1225.3 N/A 13.0 924 1400 947 1440.0 698 213 29.3 N/A N/A N/A
01/02 1225.3 N/A 13.0 781 1490 1204 1442.0 890 248 27.5 N/A N/A N/A
01/01 1225.0 N/A 12.7 720 1490 809 1434.0 526 141 29.7 542.5 626 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.