USGS Streamgage 06307500
Tongue River at Tongue River Dam near Decker, MT
Tongue River at Tongue River Dam near Decker, MT is USGS streamgage 06307500 in Montana, monitoring river discharge in hydrologic subbasin 10090101. It drains a watershed of about 1,784 square miles. Discharge records at this site go back to 1939. Typical flow runs near 454.7 cfs in July and 279.4 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 1,784 sq mi
- Gauge elevation
- 3,352 ft
- Subbasin (HUC-8)
- 10090101
- Coordinates
- 45.14128, -106.77136
- USGS site number
- 06307500
- Records begin
- 1939-05-18 (87 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 87 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 96.1 | 169.1 | 219.3 | |
| February | 88.9 | 167 | 230.3 | |
| March | 79 | 179.8 | 389.9 | |
| April | 80.7 | 279.4 | 701.2 | |
| May | 233.1 | 706.4 | 1,789.5 | |
| June | 329.3 | 1,246.2 | 2,999.7 | |
| July | 253.4 | 454.7 | 1,062.4 | |
| August | 163.2 | 376.8 | 516.8 | |
| September | 133.4 | 292.2 | 464.6 | |
| October | 102.4 | 227.1 | 480.5 | |
| November | 94.6 | 208.9 | 447.4 | |
| December | 98 | 179.2 | 253.6 |
All values in cubic feet per second (cfs).