US Army Corps of Engineers

Grand Coulee Dam

October 2026

Day of MonthTotal Generation MWhAverage Generation MWStation Use MWhInflow kcfsTotal Outflow kcfsGeneration Flow kcfsSpill kcfsMidnight Reservoir ElevationAverage Forebay ElevationAverage Tailwater ElevationAverage Head feetBanks Lake Pump kcfsBanks Lake Pump MWhBanks Lake Elev
1 28454 1186 171 55.30 48.90 48.90 0.00 1286.70 1286.61 956.05 330.56 2.42 1625 1568.09
2 32240 1343 167 52.70 54.00 54.00 0.00 1286.60 1286.69 956.82 329.87 2.27 1513 1567.95
3 25690 1070 168 55.10 43.90 43.90 0.00 1286.80 1286.70 956.20 330.50 2.32 1535 1567.81
4 36216 1509 167 65.90 61.90 61.90 0.00 1286.70 1286.86 957.50 329.36 7.20 4752 1568.00
5 36088 1504 175 53.20 60.60 60.60 0.00 1286.50 1286.57 957.43 329.14 2.24 1554 1567.86
6 40997 1708 211 61.50 69.00 69.00 0.00 1286.30 1286.40 957.95 328.45 2.18 1483 1567.67
7 42655 1777 209 62.90 71.90 71.90 0.00 1286.00 1286.14 958.16 327.98 2.25 1531 1567.47
8 1285.80
9 36224 1509 196 59.20 59.70 59.70 0.00 1285.60 1285.69 956.83 328.86 10.70 7079 1567.69
10 34168 1424 198 64.30 56.10 56.10 0.00 1285.50 1285.52 956.47 329.05 10.63 7078 1567.99
11 37503 1563 192 63.30 61.90 61.90 0.00 1285.30 1285.30 957.22 328.08 10.60 7076 1568.36
12 37390 1558 192 68.60 62.40 62.40 0.00 1285.30 1285.21 957.38 327.83 2.60 1730 1568.41
13 33085 1379 197 59.70 57.70 57.70 0.00 1285.40 1285.31 956.82 328.49 0.00 0 1567.89
14 25510 1063 203 65.60 47.20 47.20 0.00 1285.90 1285.62 955.68 329.94 0.00 0 1567.51
15 27946 1164 193 65.90 52.20 52.20 0.00 1286.20 1285.99 956.43 329.56 0.00 0 1567.12
16 23496 979 188 70.90 48.70 48.70 0.00 1286.70 1286.48 955.77 330.71 1.31 867 1566.78
17 21945 914 184 62.20 43.10 43.10 0.00 1286.90 1286.82 954.90 331.92 10.70 7080 1567.17
18 26859 1119 186 60.20 49.10 49.10 0.00 1286.90 1286.90 955.80 331.10 10.35 6863 1567.50
19 29079 1212 193 60.10 51.40 51.40 0.00 1287.10 1287.04 956.51 330.53 2.55 1735 1567.34
20 31790 1325 194 64.80 54.40 54.40 0.00 1287.30 1287.20 956.64 330.56 3.43 2367 1567.34
21 30574 1274 193 60.50 52.30 52.30 0.00 1287.40 1287.27 956.74 330.53 2.48 1688 1567.29
22 30122 1255 189 58.20 52.10 52.10 0.00 1287.50 1287.37 956.73 330.64 2.05 1381 1567.25
23 24601 1025 188 56.20 40.80 40.80 0.00 1287.70 1287.52 956.02 331.50 6.80 4635 1567.63
24 25177 1049 186 57.40 42.30 42.30 0.00 1288.00 1287.76 955.82 331.94 4.92 3285 1567.95
25 25866 1078 187 52.60 44.10 44.10 0.00 1288.20 1288.03 956.03 332.00 6.21 4232 1568.42
26 25194 1050 183 44.20 42.60 42.60 0.00 1288.50 1288.29 956.44 331.85 0.00 0 1568.42
27 29826 1243 190 51.50 50.70 50.70 0.00 1288.80 1288.64 957.30 331.34 0.00 0 1568.45
28 35032 1460 191 57.70 58.50 58.50 0.00 1288.70 1288.69 957.57 331.12 0.00 0 1568.40
29 38029 1585 186 59.00 63.10 63.10 0.00 1288.60 1288.65 958.18 330.47 0.00 0 1568.37
30 59.20 64.60 64.60 0.00 1288.50 1288.55 957.85 330.70 1568.36
31 58.00 59.20 59.20 0.00 1288.50 1288.40 957.26 331.14 1568.35
1 63.40 54.80 54.80 0.00 1288.70 1288.55 956.85 331.70 1568.34
TOT871756  5277           
AVG 31134 1297 188 59.65 54.17 54.17 0.00 1287.02 1286.99 956.75 330.24 3.79 2539 1567.84
MAX 42655   70.90 71.90 71.90 0.00 1288.80 1288.69 958.18 332.00 10.70 7080 1568.45
MIN 21945   44.20 40.80 40.80 0.00 1285.30 1285.21 954.90 327.83 0.00 0 1566.78
BUILDING STRONG®