USGS Streamgage 06065500
Missouri River below Hauser Dam near Helena, MT
Missouri River below Hauser Dam near Helena, MT is USGS streamgage 06065500 in Montana, monitoring river discharge in hydrologic subbasin 10030101. It drains a watershed of about 16,669 square miles. Discharge records at this site go back to 1922. Typical flow runs near 3,963.2 cfs in July and 4,566 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 16,669 sq mi
- Gauge elevation
- 3,621 ft
- Subbasin (HUC-8)
- 10030101
- Coordinates
- 46.76619, -111.88879
- USGS site number
- 06065500
- Records begin
- 1922-10-01 (104 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 104 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 | 2,317.7 | 3,695.5 | 5,431.3 | |
| February | 2,394.8 | 3,854.5 | 5,601.7 | |
| March | 2,961.6 | 4,017.4 | 6,307.1 | |
| April | 3,012.3 | 4,566 | 8,255.3 | |
| May | 3,091.3 | 5,630 | 11,952.9 | |
| June | 2,908.7 | 5,896.7 | 15,686.7 | |
| July | 2,163.9 | 3,963.2 | 8,359.7 | |
| August | 1,761.6 | 3,653.9 | 5,002.9 | |
| September | 1,999.7 | 3,709 | 5,039.7 | |
| October | 2,517.4 | 3,506.1 | 4,748.1 | |
| November | 2,550 | 3,642.7 | 5,185.7 | |
| December | 2,476.1 | 3,734.8 | 5,346.8 |
All values in cubic feet per second (cfs).