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 sits on the Shasta River, alongside 1 other gauge Rivermatics tracks on the same river. 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. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.
View live conditions & forecast →
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)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Shasta River near Montague, CA. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 62.1 | 67.7 | 77.9 | ||
| 58.9 | 66.2 | 80.1 | ||
| 57.7 | 66 | 82.3 | ||
| 56.7 | 65.4 | 81.1 | ||
| 56.3 | 65.6 | 82.9 | ||
| 56.1 | 67.1 | 89.1 | ||
| 56.3 | 68.1 | 91.6 | ||
| 56.5 | 68.9 | 93.2 | ||
| 56.1 | 68.5 | 92.1 | ||
| 56.8 | 69.9 | 94.1 | ||
| 57.3 | 71 | 95.4 | ||
| 57.4 | 71 | 95.1 | ||
| 57.6 | 72.4 | 99.2 | ||
| 58 | 73.2 | 99.8 |
All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.
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 9,075 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Shasta River near Montague, CA?
- Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
- 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.
Upstream and downstream on the Shasta River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Shasta River in full.
- Shasta River near Montague, CA this page
- Shasta River near Yreka, CA 793 sq mi