Overview Realtime Historical Map View
Air Quality Alert
None

* WHAT...Air Quality Advisory because of degraded air quality due to wildfire smoke. Air Quality Index is forecast to be Unhealthy. * WHERE...Ada, Adams, Boise, Canyon, Elmore, Gem, Owyhee, Payette, Valley, and Washington Counties. * WHEN...UNTIL 2 PM MDT TUESDAY. * IMPACTS...Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.

Snake River At Hells Canyon Dam Id-Or State Line Historical Data

Historical Data


Streamflow Range


Date Average 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015
01-01 11631.43
01-02 12050.0
01-03 10624.29
01-04 10026.67
01-05 10975.71
01-06 10767.14
01-07 11047.14
01-08 10510.0
01-09 11587.14
01-10 10860.0
01-11 10611.43
01-12 10204.29
01-13 10985.71
01-14 11615.0
01-15 12332.86
01-16 12341.43
01-17 12921.25
01-18 12125.0
01-19 12405.0
01-20 13355.0
01-21 11388.57
01-22 12955.0
01-23 14257.14
01-24 14326.25
01-25 12632.5
01-26 14248.57
01-27 12804.29
01-28 13798.75
01-29 13885.0
01-30 14288.89
01-31 13357.78
02-01 13063.75
02-02 14278.75
02-03 14286.67
02-04 14545.56
02-05 13694.44
02-06 13617.5
02-07 13553.75
02-08 13288.57
02-09 13844.44
02-10 12970.0
02-11 13301.43
02-12 12895.0
02-13 14770.0
02-14 15192.22
02-15 15366.67
02-16 15228.89
02-17 16478.75
02-18 15691.25
02-19 13827.5
02-20 15464.44
02-21 15791.11
02-22 15528.89
02-23 15561.11
02-24 15865.56
02-25 14712.86
02-26 13913.75
02-27 15071.11
02-28 15721.11
02-29 16133.33
03-01 14521.11
03-02 14473.33
03-03 15062.22
03-04 15317.78
03-05 14495.56
03-06 13976.25
03-07 15188.89
03-08 14775.56
03-09 15915.56
03-10 15504.44
03-11 16234.44
03-12 14734.44
03-13 15463.33
03-14 13718.89
03-15 15701.11
03-16 15841.11
03-17 15963.33
03-18 16631.11
03-19 22094.0
03-20 21500.0
03-21 21950.0
03-22 22214.44
03-23 22347.0
03-24 22512.0
03-25 22944.0
03-26 21844.0
03-27 22750.0
03-28 16418.89
03-29 22414.0
03-30 22551.0
03-31 22757.78
04-01 22429.0
04-02 21583.0
04-03 22267.0
04-04 23379.0
04-05 23075.0
04-06 17465.56
04-07 23031.0
04-08 23731.0
04-09 17801.25
04-10 25126.0
04-11 25975.0
04-12 24832.22
04-13 25534.44
04-14 25231.11
04-15 26658.75
04-16 27117.5
04-17 22930.0
04-18 26600.0
04-19 27380.0
04-20 27555.0
04-21 25972.22
04-22 24722.22
04-23 24411.11
04-24 24603.33
04-25 23452.5
04-26 23967.78
04-27 23298.89
04-28 23845.56
04-29 23521.11
04-30 18165.0
05-01 23867.78
05-02 19415.0
05-03 19545.0
05-04 22065.56
05-05 23046.67
05-06 21962.22
05-07 20788.89
05-08 15792.5
05-09 20198.89
05-10 20302.5
05-11 19795.56
05-12 19784.44
05-13 19252.22
05-14 14954.29
05-15 16666.25
05-16 21076.67
05-17 20784.44
05-18 20984.44
05-19 20758.89
05-20 21222.22
05-21 21160.0
05-22 21425.56
05-23 19892.22
05-24 21031.11
05-25 21586.67
05-26 22081.11
05-27 22238.89
05-28 22777.78
05-29 23177.78
05-30 22781.11
05-31 23718.89
06-01 24935.56
06-02 26143.75
06-03 24593.33
06-04 23557.78
06-05 25367.5
06-06 25310.0
06-07 24475.0
06-08 21530.0
06-09 20471.11
06-10 19932.22
06-11 19997.78
06-12 21411.25
06-13 21282.5
06-14 20558.75
06-15 20337.78
06-16 19956.67
06-17 17370.0
06-18 16716.67
06-19 16895.0
06-20 17318.75
06-21 18540.0
06-22 18412.5
06-23 19076.25
06-24 16066.25
06-25 16562.5
06-26 15646.25
06-27 14396.25
06-28 14930.0
06-29 13407.5
06-30 13916.25
07-01 13427.14
07-02 10988.75
07-03 13016.25
07-04 10107.14
07-05 11583.33
07-06 11477.78
07-07 11467.5
07-08 12211.25
07-09 10373.75
07-10 10710.0
07-11 10441.25
07-12 12095.0
07-13 10825.0
07-14 11013.33
07-15 10228.89
07-16 10285.0
07-17 10733.33
07-18 11051.25
07-19 10215.56
07-20 9942.22
07-21 10605.56
07-22 11318.75
07-23 10405.0
07-24 10351.11
07-25 9953.33
07-26 9818.89
07-27 11020.0
07-28 9991.11
07-29 10915.56
07-30 11130.0
07-31 10320.0
08-01 10471.43
08-02 9670.0
08-03 10463.33
08-04 10611.11
08-05 10024.44
08-06 9157.78
08-07 8554.44
08-08 8520.0
08-09 8222.5
08-10 9791.25
08-11 8424.44
08-12 8644.44
08-13 8983.33
08-14 8615.56
08-15 8658.89
08-16 8362.5
08-17 8860.0
08-18 9324.29
08-19 8320.0
08-20 8321.25
08-21 7911.25
08-22 7845.71
08-23 8210.0
08-24 8701.25
08-25 8191.25
08-26 7867.78
08-27 8251.11
08-28 8632.22
08-29 8617.78
08-30 8744.44
08-31 9531.25
09-01 8547.78
09-02 8491.11
09-03 8495.56
09-04 8402.22
09-05 9441.11
09-06 8975.56
09-07 9544.44
09-08 8851.11
09-09 8198.89
09-10 8551.11
09-11 8702.22
09-12 8815.56
09-13 8276.25
09-14 8815.56
09-15 10354.44
09-16 9243.33
09-17 9320.0
09-18 9652.22
09-19 8690.0
09-20 9071.11
09-21 9818.89
09-22 10061.25
09-23 9627.78
09-24 9947.78
09-25 10976.67
09-26 11355.56
09-27 10938.89
09-28 11330.0
09-29 11408.89
09-30 12607.78
10-01 12998.57
10-02 13490.0
10-03 12775.0
10-04 11945.71
10-05 12034.44
10-06 12484.44
10-07 11524.44
10-08 11948.89
10-09 12235.56
10-10 10428.89
10-11 10352.22
10-12 9470.0
10-13 9648.89
10-14 8565.56
10-15 8648.75
10-16 8590.0
10-17 8531.11
10-18 8472.22
10-19 8488.75
10-20 8516.25
10-21 8491.25
10-22 8503.33
10-23 8515.56
10-24 8511.11
10-25 8528.89
10-26 8501.25
10-27 8488.89
10-28 8488.75
10-29 8504.44
10-30 8525.56
10-31 8465.0
11-01 8570.0
11-02 8551.25
11-03 8573.75
11-04 8585.56
11-05 8557.78
11-06 8568.75
11-07 8513.75
11-08 8496.25
11-09 8530.0
11-10 8558.75
11-11 8601.25
11-12 8592.5
11-13 8543.75
11-14 8525.56
11-15 8551.11
11-16 8477.5
11-17 8513.33
11-18 8522.5
11-19 8560.0
11-20 8526.25
11-21 8558.89
11-22 8583.75
11-23 8465.0
11-24 8470.0
11-25 8476.25
11-26 8552.5
11-27 8548.75
11-28 8615.0
11-29 8611.11
11-30 8575.56
12-01 8626.67
12-02 8593.33
12-03 8677.5
12-04 8598.89
12-05 8596.67
12-06 8588.75
12-07 9142.22
12-08 9255.56
12-09 9290.0
12-10 9867.78
12-11 9681.11
12-12 9842.22
12-13 9974.44
12-14 10732.86
12-15 11726.25
12-16 10612.86
12-17 10184.29
12-18 9725.71
12-19 12098.75
12-20 10737.14
12-21 10518.57
12-22 10852.5
12-23 11146.25
12-24 12350.0
12-25 11268.75
12-26 10200.0
12-27 10792.86
12-28 10481.43
12-29 10953.33
12-30 10430.0
12-31 10791.43

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index