Overview Realtime Historical Map View

Cowlitz River Below Mayfield Dam, 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 9053.33
01-02 8960.0
01-03 8956.36
01-04 9623.33
01-05 9311.67
01-06 9451.67
01-07 9851.67
01-08 9612.5
01-09 9058.18
01-10 9810.83
01-11 9888.33
01-12 10445.0
01-13 10720.0
01-14 10591.67
01-15 10660.0
01-16 11100.0
01-17 11323.08
01-18 10970.0
01-19 10137.69
01-20 10223.08
01-21 10095.83
01-22 10494.62
01-23 10514.17
01-24 10451.54
01-25 10321.67
01-26 9575.0
01-27 9704.62
01-28 9695.38
01-29 9839.23
01-30 9516.15
01-31 9330.0
02-01 9156.43
02-02 8804.29
02-03 8965.71
02-04 8945.71
02-05 9836.43
02-06 9845.38
02-07 10037.69
02-08 9789.17
02-09 9037.14
02-10 9094.29
02-11 9110.77
02-12 8901.43
02-13 8770.0
02-14 8800.0
02-15 8573.57
02-16 8343.57
02-17 7651.54
02-18 7725.38
02-19 8237.86
02-20 8109.29
02-21 7897.14
02-22 8048.57
02-23 8747.86
02-24 8570.0
02-25 7550.83
02-26 7927.69
02-27 8410.71
02-28 8230.71
02-29 9620.0
03-01 7654.62
03-02 7521.43
03-03 7182.86
03-04 7010.71
03-05 6885.0
03-06 7428.57
03-07 7155.0
03-08 6931.43
03-09 7056.43
03-10 7439.29
03-11 7816.43
03-12 8110.0
03-13 7795.0
03-14 7945.0
03-15 7935.71
03-16 7876.43
03-17 8175.71
03-18 7684.29
03-19 7804.0
03-20 8035.71
03-21 8109.33
03-22 7792.86
03-23 7480.67
03-24 7488.0
03-25 7640.67
03-26 7692.67
03-27 7444.0
03-28 7538.0
03-29 7531.33
03-30 7408.67
03-31 7345.71
04-01 7345.33
04-02 7172.0
04-03 7265.33
04-04 7157.33
04-05 6795.33
04-06 6540.71
04-07 6580.67
04-08 6935.33
04-09 6884.62
04-10 7026.0
04-11 7392.0
04-12 7159.29
04-13 7029.29
04-14 7067.69
04-15 6974.62
04-16 6815.38
04-17 6577.5
04-18 7070.77
04-19 6788.46
04-20 6656.15
04-21 6700.0
04-22 6787.14
04-23 6844.29
04-24 6463.57
04-25 6686.15
04-26 6617.14
04-27 6300.0
04-28 6173.57
04-29 6119.29
04-30 5894.62
05-01 6648.67
05-02 6477.86
05-03 6491.43
05-04 7225.33
05-05 6847.14
05-06 7502.67
05-07 7144.67
05-08 6617.14
05-09 7092.0
05-10 7123.57
05-11 7080.67
05-12 7120.67
05-13 7258.0
05-14 6857.69
05-15 6921.54
05-16 7184.29
05-17 6478.57
05-18 6034.0
05-19 6061.33
05-20 6176.43
05-21 6425.33
05-22 6710.67
05-23 6502.0
05-24 6046.0
05-25 5874.0
05-26 5728.0
05-27 5776.0
05-28 6018.0
05-29 5989.33
05-30 6050.67
05-31 6078.67
06-01 6032.67
06-02 6193.33
06-03 5933.33
06-04 5980.0
06-05 5761.43
06-06 5867.86
06-07 6363.57
06-08 5929.29
06-09 5804.67
06-10 6186.0
06-11 5896.0
06-12 5521.43
06-13 5276.43
06-14 5535.0
06-15 5806.67
06-16 6013.33
06-17 5678.67
06-18 5533.33
06-19 5510.71
06-20 5663.57
06-21 6224.29
06-22 6197.86
06-23 5877.86
06-24 5842.86
06-25 5946.43
06-26 5856.43
06-27 5771.43
06-28 5740.71
06-29 5869.29
06-30 5679.29
07-01 5369.29
07-02 4610.0
07-03 3888.57
07-04 3515.38
07-05 3342.67
07-06 3720.0
07-07 3866.43
07-08 3704.29
07-09 3592.14
07-10 3570.0
07-11 3555.0
07-12 3760.71
07-13 3755.0
07-14 3597.14
07-15 3522.14
07-16 3456.15
07-17 3557.86
07-18 3523.08
07-19 3253.85
07-20 3250.0
07-21 3319.23
07-22 3320.0
07-23 3246.15
07-24 3498.46
07-25 3672.31
07-26 3516.15
07-27 3361.54
07-28 3499.17
07-29 3600.83
07-30 3731.67
07-31 3630.0
08-01 3710.91
08-02 3427.27
08-03 3585.0
08-04 3493.08
08-05 3312.31
08-06 3346.92
08-07 3360.77
08-08 3317.5
08-09 3633.33
08-10 3600.0
08-11 3412.31
08-12 3164.62
08-13 3059.17
08-14 3249.23
08-15 3258.46
08-16 3385.0
08-17 4030.0
08-18 3860.0
08-19 3581.54
08-20 3303.85
08-21 3102.31
08-22 2992.31
08-23 3057.14
08-24 3223.33
08-25 3162.31
08-26 3225.71
08-27 3318.57
08-28 3100.0
08-29 3109.29
08-30 3247.14
08-31 3153.85
09-01 3089.29
09-02 3130.0
09-03 3292.86
09-04 3429.29
09-05 3464.29
09-06 3268.57
09-07 3126.43
09-08 3140.71
09-09 3273.57
09-10 3281.43
09-11 3097.86
09-12 2998.57
09-13 2994.62
09-14 2885.0
09-15 2934.29
09-16 2983.85
09-17 2967.14
09-18 2980.71
09-19 2945.71
09-20 3003.85
09-21 2992.31
09-22 3050.0
09-23 2917.14
09-24 2957.14
09-25 3105.0
09-26 3126.43
09-27 3352.86
09-28 3315.71
09-29 3462.86
09-30 3670.77
10-01 4387.5
10-02 4281.54
10-03 4294.17
10-04 4293.08
10-05 3944.29
10-06 3940.71
10-07 3941.43
10-08 3897.14
10-09 3927.14
10-10 3952.14
10-11 4030.0
10-12 3965.71
10-13 4007.86
10-14 4017.86
10-15 4188.46
10-16 4200.77
10-17 4160.71
10-18 4107.86
10-19 4303.08
10-20 4323.85
10-21 4213.85
10-22 4370.0
10-23 4505.71
10-24 4332.14
10-25 4400.71
10-26 4600.77
10-27 4599.29
10-28 4661.54
10-29 4672.86
10-30 4902.86
10-31 5013.08
11-01 4696.92
11-02 4884.29
11-03 5167.69
11-04 5130.71
11-05 5772.86
11-06 5689.23
11-07 5543.85
11-08 5776.92
11-09 5426.15
11-10 5544.62
11-11 6063.08
11-12 6575.38
11-13 7336.92
11-14 7557.14
11-15 7470.0
11-16 7572.14
11-17 7044.17
11-18 7430.77
11-19 8012.31
11-20 8382.14
11-21 8495.0
11-22 8790.0
11-23 8605.38
11-24 8243.85
11-25 8243.85
11-26 8452.31
11-27 8731.67
11-28 8327.86
11-29 9095.71
11-30 9094.29
12-01 8927.86
12-02 9345.71
12-03 9276.15
12-04 9377.14
12-05 10320.0
12-06 10832.31
12-07 10373.85
12-08 10707.86
12-09 10427.14
12-10 10412.14
12-11 10217.14
12-12 10533.57
12-13 10321.54
12-14 10151.67
12-15 10253.08
12-16 10712.31
12-17 10850.83
12-18 10540.0
12-19 11610.77
12-20 10649.17
12-21 11279.23
12-22 11023.08
12-23 10396.92
12-24 10003.08
12-25 9003.08
12-26 7624.55
12-27 9205.83
12-28 8587.27
12-29 9143.33
12-30 8940.0
12-31 8916.67

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index