USGS Streamgage 11501000
Sprague River near Chiloquin, OR
Sprague River near Chiloquin, OR is USGS streamgage 11501000 in Oregon, monitoring river discharge in hydrologic subbasin 18010202. It drains a watershed of about 1,565 square miles. Discharge records at this site go back to 1921. Typical flow runs near 236 cfs in July and 971.6 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Oregon
- Drainage area
- 1,565 sq mi
- Gauge elevation
- 4,202 ft
- Subbasin (HUC-8)
- 18010202
- Coordinates
- 42.58431, -121.84833
- USGS site number
- 11501000
- Records begin
- 1921-03-01 (105 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 105 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 | 246.7 | 360 | 993.5 | |
| February | 268.7 | 448.5 | 1,235.5 | |
| March | 326.5 | 688.6 | 1,851.9 | |
| April | 383.1 | 971.6 | 2,475 | |
| May | 296 | 922.6 | 2,176.1 | |
| June | 191.1 | 462.8 | 1,142.9 | |
| July | 135.9 | 236 | 432.4 | |
| August | 113.9 | 198.3 | 284.9 | |
| September | 143.6 | 218 | 302.2 | |
| October | 197.8 | 267 | 356.1 | |
| November | 226.7 | 305.7 | 436.8 | |
| December | 239 | 335 | 706.2 |
All values in cubic feet per second (cfs).
Common questions
- When does Sprague River near Chiloquin, OR normally run highest?
- April, on the long-term record. The median daily flow that month is about 971.6 cfs, against 198.3 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 Sprague River near Chiloquin, OR?
- It depends on the month. In January, half of days historically fall near 360 cfs, with the middle 80% of days between 246.7 and 993.5 cfs. The month-by-month table on this page gives the full range.
- How long has Sprague River near Chiloquin, OR been measured?
- Discharge records at USGS site 11501000 begin in 1921, about 105 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 Sprague River near Chiloquin, OR?
- The gauge sits at 42.58431, -121.84833, in Oregon, in hydrologic subbasin 18010202, at an elevation of about 4,202 feet, draining roughly 1,565 square miles.
- Can I use Sprague River near Chiloquin, OR 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.