USGS Streamgage 06027600
Jefferson River at Parsons Bdg near Silver Star, MT
Jefferson River at Parsons Bdg near Silver Star, MT is USGS streamgage 06027600 in Montana, monitoring river discharge in hydrologic subbasin 10020005. It sits on the Jefferson River, alongside 2 other gauges Rivermatics tracks on the same river. It drains a watershed of about 7,759 square miles. Discharge records at this site go back to 2006. Typical flow runs near 909 cfs in July and 1,658.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 7,759 sq mi
- Gauge elevation
- 4,427 ft
- Subbasin (HUC-8)
- 10020005
- Coordinates
- 45.7475, -112.18723
- USGS site number
- 06027600
- Records begin
- 2006-07-01 (20 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 20 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
Only 8 of 12 months have enough record to summarize; the rest are omitted.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| April | — | 1,658.3 | — | |
| May | — | 3,035.5 | — | |
| June | 341.7 | 3,640 | 9,466.7 | |
| July | 148.8 | 909 | 2,559.5 | |
| August | 45.8 | 200.2 | 769.1 | |
| September | 125.7 | 390.3 | 1,044.5 | |
| October | — | 1,270.1 | — | |
| November | — | 761.7 | — |
All values in cubic feet per second (cfs).
Common questions
- When does Jefferson River at Parsons Bdg near Silver Star, MT normally run highest?
- June, on the long-term record. The median daily flow that month is about 3,640 cfs, against 200.2 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Jefferson River at Parsons Bdg near Silver Star, MT?
- It depends on the month. In June, half of days historically fall near 3,640 cfs, with the middle 80% of days between 341.7 and 9,466.7 cfs. The month-by-month table on this page gives the full range.
- How long has Jefferson River at Parsons Bdg near Silver Star, MT been measured?
- Discharge records at USGS site 06027600 begin in 2006, about 20 years, covering roughly 2,576 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Jefferson River at Parsons Bdg near Silver Star, MT?
- The gauge sits at 45.7475, -112.18723, in Montana, in hydrologic subbasin 10020005, at an elevation of about 4,427 feet, draining roughly 7,759 square miles.
- Can I use Jefferson River at Parsons Bdg near Silver Star, MT data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.
Upstream and downstream on the Jefferson River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Jefferson River in full.
- Jefferson River near Twin Bridges, MT 7,616 sq mi
- Jefferson River at Parsons Bdg near Silver Star, MT this page
- Jefferson River near Three Forks, MT 9,558 sq mi