USGS Streamgage 06102050
Marias River near Loma, MT
Marias River near Loma, MT is USGS streamgage 06102050 in Montana, monitoring river discharge in hydrologic subbasin 10030203. It drains a watershed of about 7,027 square miles. Discharge records at this site go back to 1959. Typical flow runs near 695.7 cfs in July and 551.9 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 7,027 sq mi
- Gauge elevation
- 2,574 ft
- Subbasin (HUC-8)
- 10030203
- Coordinates
- 47.9459, -110.58084
- USGS site number
- 06102050
- Records begin
- 1959-10-01 (67 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 67 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 | 102.3 | 294.5 | 551.8 | |
| February | 131 | 333.4 | 969.9 | |
| March | 132.2 | 391.9 | 1,485.8 | |
| April | 304.6 | 551.9 | 1,387.7 | |
| May | 411.4 | 798.1 | 2,103.5 | |
| June | 413.4 | 1,003.1 | 3,079.7 | |
| July | 328.3 | 695.7 | 2,136.1 | |
| August | 289.3 | 619.6 | 2,041.3 | |
| September | 351 | 569.1 | 1,554 | |
| October | 298.5 | 514.9 | 1,218.1 | |
| November | 116.2 | 538.4 | 1,465 | |
| December | 92.3 | 397.5 | 848.3 |
All values in cubic feet per second (cfs).