Results
| Country: | U.S.A.
| | Station: | CANYON FERRY DAM NR HELENA, MT. | | River: | MISSOURI R | | Area: | 25976421.87 | | Lat: | 46.64 | | Lon: | -111.72 | | Source: | USGS | | PointID: | 6058502 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1978 | | Ending Year: | 1995 | | Total Years: | 18 | | Total Usable Years: | 17 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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| 1978 | 1.81 | 1.65 | 46.67 | 176.15 | 49.3 | 16.93 | 19.12 | 12.68 | 25.32 | 9.39 | 8.09 | 5.41 | 31.04 |
| 1979 | 4.27 | 4.4 | 115.39 | 91.38 | 60.24 | 16 | 16.56 | 10.34 | 5.35 | 3.55 | 4.51 | 4.08 | 28.01 |
| 1980 | 3.12 | 2.96 | 3.81 | 6.02 | 5.16 | 4.8 | 7.86 | 5.95 | 3.57 | 1.63 | 3.47 | 2.52 | 4.24 |
| 1981 | 3.16 | 4.1 | 2.36 | 1.21 | 5.51 | 4.59 | 6.33 | 5.28 | 3.84 | 2.71 | 3.8 | 2.62 | 3.79 |
| 1982 | 1.9 | 3.87 | 44.95 | 39.46 | 12.35 | 63.93 | 18.58 | 8.9 | 5.02 | 3.35 | 5.13 | 3.59 | 17.59 |
| 1983 | 4.72 | 6.38 | 5.83 | 4.95 | 6.45 | 5.53 | 15.47 | 5.39 | 2.34 | 2.51 | 3.33 | 1.95 | 5.4 |
| 1984 | 3 | 4.62 | 2.73 | 1.34 | 3.86 | 4.63 | 0.84 | 0.26 | 0.64 | 1.3 | 2.06 | 1.3 | 2.22 |
| 1985 | 0.94 | 1.64 | 2.07 | 2.04 | 4.68 | 4.95 | 4.12 | 3.15 | 1.31 | 1.66 | 2.36 | 1.27 | 2.52 |
| 1986 | 3.63 | 17.69 | 101.8 | 4.43 | 72.07 | 24.68 | 9.6 | 5.14 | 42.95 | 114.49 | 16.9 | 11.51 | 35.41 |
| 1987 | 7.67 | 11.38 | 31.63 | 15.6 | 7.26 | 6.53 | 7.61 | 5.69 | 3.97 | 2.64 | 3.02 | 4.93 | 8.99 |
| 1988 | 2.5 | 2.55 | 4.05 | 1.63 | 6.18 | 7.61 | 7.05 | 1.88 | 0.9 | 1.39 | 2.35 | 1.97 | 3.34 |
| 1989 | 1.48 | 1.55 | 6.31 | 3.29 | 1.6 | 8.34 | 8.14 | 4.83 | 3.51 | 2.71 | 4.96 | 3.08 | 4.15 |
| 1990 | 6.99 | 3.74 | 14.45 | 4.87 | 9.21 | 15.56 | 9.4 | 8.67 | 5.31 | 2.57 | 3.17 | 3.06 | 7.25 |
| 1991 | 3.02 | 3.98 | 4.82 | 1.59 | 5.8 | 19.93 | 52.21 | 8.8 | 6.09 | 2.43 | 4.16 | 3.85 | 9.72 |
| 1992 | 3.15 | 3.51 | 3.38 | 1.49 | 6.58 | 3.92 | 3.34 | 3.81 | 2.51 | 2.54 | 2.84 | 1.92 | 3.25 |
| 1993 | 1.34 | 1.73 | 21.5 | 8.54 | 5.94 | 5.63 | 27.19 | 19.63 | 23.92 | 24.96 | 7.58 | 6.87 | 12.9 |
| 1994 | 6.35 | 6.73 | 95.04 | 22.13 | 17.42 | 25.56 | 6.53 | 5.83 | 4.42 | 3.83 | 3.39 | 2.32 | 16.63 |
| 1995 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
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| Avg | 3.47 | 4.85 | 29.81 | 22.71 | 16.45 | 14.07 | 12.94 | 6.84 | 8.29 | 10.8 | 4.77 | 3.66 | 11.56 |
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| Std Dev | 1.92 |
3.98 |
37.28 |
44.13 |
21.06 |
14.36 |
11.81 |
4.38 |
11.11 |
26.49 |
3.44 |
2.45 |
10.36 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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