USGS Streamgage 11517500
Shasta River near Yreka, CA
Shasta River near Yreka, CA is USGS streamgage 11517500 in California, monitoring river discharge in hydrologic subbasin 18010207. It drains a watershed of about 793 square miles. Discharge records at this site go back to 1933. Typical flow runs near 30.9 cfs in July and 144.2 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 793 sq mi
- Gauge elevation
- 2,037 ft
- Subbasin (HUC-8)
- 18010207
- Coordinates
- 41.82288, -122.59556
- USGS site number
- 11517500
- Records begin
- 1933-10-01 (93 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 93 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 | 158.2 | 216.8 | 562.5 | |
| February | 162.3 | 238.2 | 615.7 | |
| March | 141.7 | 232.6 | 531.2 | |
| April | 55.8 | 144.2 | 393.5 | |
| May | 35.6 | 105.5 | 268.6 | |
| June | 23 | 69.6 | 190.9 | |
| July | 12.5 | 30.9 | 94.9 | |
| August | 12.8 | 31 | 74.8 | |
| September | 29.2 | 65.2 | 111.7 | |
| October | 103.9 | 143.3 | 188.2 | |
| November | 133.1 | 177.9 | 244 | |
| December | 143.9 | 195.8 | 409.2 |
All values in cubic feet per second (cfs).
Common questions
- When does Shasta River near Yreka, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 238.2 cfs, against 30.9 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 Yreka, CA?
- It depends on the month. In January, half of days historically fall near 216.8 cfs, with the middle 80% of days between 158.2 and 562.5 cfs. The month-by-month table on this page gives the full range.
- How long has Shasta River near Yreka, CA been measured?
- Discharge records at USGS site 11517500 begin in 1933, about 93 years, covering roughly 9,126 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Shasta River near Yreka, CA?
- The gauge sits at 41.82288, -122.59556, in California, in hydrologic subbasin 18010207, at an elevation of about 2,037 feet, draining roughly 793 square miles.
- Can I use Shasta River near Yreka, 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.