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Air Quality Alert
None

An Air Quality Alert has been issued by the following agencies: Washington Department of Ecology Colville Confederated Tribes Environmental Protection Agency Spokane Regional Clean Air Agency An Air Quality Alert has been issued for Adams, Asotin, Chelan, Douglas, Ferry, Garfield, Grant, Lincoln, Okanogan, Pend Oreille, Spokane, Stevens, and Whitman Counties until further notice due to current and expected smoke from regional fires. Particulate matter (PM2.5) may reach Very Unhealthy levels. When air quality is Very Unhealthy, everyone should reduce exposure. Stay inside and filter indoor air to keep it cleaner. Go elsewhere for cleaner air, if needed.

Similkameen River Near Nighthawk, Wa Historical Data

Historical Data


Streamflow Range


Date Average 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011
01-01 1012.57
01-02 961.86
01-03 920.13
01-04 920.88
01-05 909.75
01-06 939.78
01-07 971.88
01-08 1012.75
01-09 982.63
01-10 953.0
01-11 941.0
01-12 942.75
01-13 942.14
01-14 1370.57
01-15 1410.86
01-16 1327.0
01-17 1187.88
01-18 1166.25
01-19 1153.63
01-20 1128.75
01-21 1060.13
01-22 982.44
01-23 940.63
01-24 891.8
01-25 895.11
01-26 1022.11
01-27 1025.8
01-28 1004.82
01-29 1031.82
01-30 946.0
01-31 929.15
02-01 1018.33
02-02 1034.83
02-03 1086.38
02-04 1033.92
02-05 1033.0
02-06 983.75
02-07 1062.0
02-08 1185.0
02-09 1066.0
02-10 1196.0
02-11 1227.11
02-12 1198.5
02-13 1181.3
02-14 1182.3
02-15 1120.73
02-16 1215.7
02-17 1124.3
02-18 1116.1
02-19 1065.27
02-20 1098.7
02-21 981.91
02-22 957.0
02-23 1027.7
02-24 996.73
02-25 928.4
02-26 898.36
02-27 906.0
02-28 895.58
02-29 842.5
03-01 844.09
03-02 873.08
03-03 872.5
03-04 862.75
03-05 886.46
03-06 884.62
03-07 883.92
03-08 880.92
03-09 888.62
03-10 932.23
03-11 920.31
03-12 936.31
03-13 944.38
03-14 925.43
03-15 936.71
03-16 1029.93
03-17 1023.64
03-18 1068.77
03-19 1087.47
03-20 1184.57
03-21 1340.07
03-22 1596.07
03-23 1467.47
03-24 1421.67
03-25 1416.47
03-26 1425.33
03-27 1445.13
03-28 1508.67
03-29 1618.4
03-30 1662.53
03-31 1695.5
04-01 1749.73
04-02 1752.87
04-03 1815.93
04-04 1940.67
04-05 2104.5
04-06 2094.5
04-07 2076.14
04-08 2141.87
04-09 2329.69
04-10 2448.27
04-11 2536.2
04-12 2728.57
04-13 2802.86
04-14 2801.64
04-15 2412.69
04-16 2432.85
04-17 2512.75
04-18 2513.31
04-19 2676.85
04-20 2941.92
04-21 3841.64
04-22 4274.5
04-23 4702.21
04-24 4911.93
04-25 5147.54
04-26 5127.43
04-27 5285.71
04-28 5436.43
04-29 5594.29
04-30 5874.62
05-01 5708.0
05-02 6141.43
05-03 6510.71
05-04 7125.33
05-05 7717.33
05-06 8665.33
05-07 9219.33
05-08 9217.86
05-09 9620.67
05-10 8488.57
05-11 10127.33
05-12 10095.33
05-13 10346.67
05-14 10583.85
05-15 11264.17
05-16 11328.46
05-17 11762.86
05-18 11788.67
05-19 11874.29
05-20 11072.86
05-21 10444.29
05-22 9964.0
05-23 10168.67
05-24 10158.67
05-25 10200.0
05-26 9702.67
05-27 9376.0
05-28 9037.33
05-29 9003.33
05-30 9064.0
05-31 8969.33
06-01 9016.67
06-02 8767.86
06-03 8692.67
06-04 8672.67
06-05 8179.29
06-06 8020.0
06-07 7955.71
06-08 7679.29
06-09 7690.0
06-10 7509.33
06-11 7449.29
06-12 7078.57
06-13 6790.71
06-14 6969.29
06-15 6650.0
06-16 6217.33
06-17 5904.67
06-18 5891.33
06-19 6007.86
06-20 5875.0
06-21 5839.29
06-22 5970.71
06-23 5930.0
06-24 5902.14
06-25 5740.0
06-26 5540.71
06-27 5267.14
06-28 5080.71
06-29 4912.86
06-30 4859.29
07-01 4683.57
07-02 4420.0
07-03 4266.43
07-04 4197.08
07-05 3779.87
07-06 3491.13
07-07 3446.5
07-08 3373.21
07-09 3267.86
07-10 3001.13
07-11 2929.43
07-12 2822.29
07-13 2632.57
07-14 2459.6
07-15 2328.93
07-16 2125.07
07-17 2077.93
07-18 2052.71
07-19 1952.33
07-20 1882.4
07-21 1788.53
07-22 1768.57
07-23 1683.79
07-24 1539.0
07-25 1517.87
07-26 1444.07
07-27 1397.4
07-28 1334.4
07-29 1255.13
07-30 1241.93
07-31 1124.8
08-01 1063.38
08-02 1039.57
08-03 970.6
08-04 999.5
08-05 954.86
08-06 921.71
08-07 884.43
08-08 884.46
08-09 850.15
08-10 852.83
08-11 763.29
08-12 738.64
08-13 748.54
08-14 697.21
08-15 673.14
08-16 688.46
08-17 676.17
08-18 648.25
08-19 607.08
08-20 585.69
08-21 561.54
08-22 546.62
08-23 530.29
08-24 548.58
08-25 527.62
08-26 510.71
08-27 498.93
08-28 481.79
08-29 471.43
08-30 465.21
08-31 476.46
09-01 481.64
09-02 469.29
09-03 462.71
09-04 453.21
09-05 449.29
09-06 444.29
09-07 445.93
09-08 535.0
09-09 516.07
09-10 484.5
09-11 463.71
09-12 452.93
09-13 440.92
09-14 434.5
09-15 428.5
09-16 442.31
09-17 431.93
09-18 452.07
09-19 451.93
09-20 471.36
09-21 483.15
09-22 476.43
09-23 462.93
09-24 454.36
09-25 461.0
09-26 478.71
09-27 483.21
09-28 509.62
09-29 542.86
09-30 584.46
10-01 619.67
10-02 593.69
10-03 621.58
10-04 581.62
10-05 583.64
10-06 569.21
10-07 557.64
10-08 561.79
10-09 569.93
10-10 601.93
10-11 624.43
10-12 639.14
10-13 618.64
10-14 621.14
10-15 639.69
10-16 629.54
10-17 645.57
10-18 674.29
10-19 708.77
10-20 789.46
10-21 850.15
10-22 804.07
10-23 759.86
10-24 776.0
10-25 777.21
10-26 720.0
10-27 778.07
10-28 745.46
10-29 822.07
10-30 817.14
10-31 989.0
11-01 1018.38
11-02 1037.71
11-03 1153.77
11-04 1193.57
11-05 1155.79
11-06 1518.46
11-07 1480.58
11-08 1323.54
11-09 1234.31
11-10 1142.15
11-11 1090.54
11-12 1081.23
11-13 1009.92
11-14 1257.36
11-15 1327.38
11-16 2480.46
11-17 2899.82
11-18 1838.08
11-19 1686.83
11-20 1595.77
11-21 1460.92
11-22 1336.54
11-23 1312.25
11-24 1289.42
11-25 1268.92
11-26 1496.0
11-27 1329.5
11-28 1305.54
11-29 1513.08
11-30 1708.75
12-01 1541.5
12-02 1820.67
12-03 1905.17
12-04 1677.08
12-05 1537.58
12-06 1447.73
12-07 1727.44
12-08 1446.55
12-09 1418.73
12-10 1427.0
12-11 1383.18
12-12 2251.82
12-13 1795.73
12-14 1711.1
12-15 1543.73
12-16 1607.82
12-17 1921.36
12-18 1884.1
12-19 1641.09
12-20 1550.55
12-21 1421.25
12-22 1312.3
12-23 1246.0
12-24 1146.2
12-25 1097.1
12-26 1056.89
12-27 1018.2
12-28 1006.11
12-29 965.33
12-30 945.86
12-31 981.75

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index