USGS Streamgage 11517000
Shasta River near Montague, CA
Shasta River near Montague, CA is USGS streamgage 11517000 in California, monitoring river discharge in hydrologic subbasin 18010207. It drains a watershed of about 673 square miles. Discharge records at this site go back to 1911. Typical flow runs near 28.2 cfs in July and 104.5 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 673 sq mi
- Gauge elevation
- 2,467 ft
- Subbasin (HUC-8)
- 18010207
- Coordinates
- 41.70899, -122.53805
- USGS site number
- 11517000
- Records begin
- 1911-10-01 (115 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 115 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 | 138.6 | 180.4 | 307.7 | |
| February | 139.1 | 181.9 | 414.5 | |
| March | 130.3 | 172.2 | 335.7 | |
| April | 36.2 | 104.5 | 324.9 | |
| May | 23.3 | 79.5 | 245.2 | |
| June | 17.3 | 50.4 | 142.4 | |
| July | 11 | 28.2 | 71.6 | |
| August | 13.7 | 32.1 | 67.5 | |
| September | 28.1 | 60.3 | 97.4 | |
| October | 98.7 | 129.2 | 157.9 | |
| November | 119 | 159 | 214.9 | |
| December | 128.8 | 173.7 | 289.3 |
All values in cubic feet per second (cfs).
Common questions
- When does Shasta River near Montague, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 181.9 cfs, against 28.2 cfs in July, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Shasta River near Montague, CA?
- It depends on the month. In January, half of days historically fall near 180.4 cfs, with the middle 80% of days between 138.6 and 307.7 cfs. The month-by-month table on this page gives the full range.
- How long has Shasta River near Montague, CA been measured?
- Discharge records at USGS site 11517000 begin in 1911, about 115 years, covering roughly 9,071 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Shasta River near Montague, CA?
- The gauge sits at 41.70899, -122.53805, in California, in hydrologic subbasin 18010207, at an elevation of about 2,467 feet, draining roughly 673 square miles.
- Can I use Shasta River near Montague, CA 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.