USGS Streamgage 12435500
Feeder Canal at Grand Coulee, WA
Feeder Canal at Grand Coulee, WA is USGS streamgage 12435500 in Washington, monitoring river discharge in hydrologic subbasin 17020001. Discharge records at this site go back to 1952. Typical flow runs near 7,587.4 cfs in July and 3,134.3 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Gauge elevation
- 1,570 ft
- Subbasin (HUC-8)
- 17020001
- Coordinates
- 47.95126, -118.99558
- USGS site number
- 12435500
- Records begin
- 1952-05-01 (74 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 74 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 | -129.3 | 0 | 40.2 | |
| February | -42.1 | 0 | 1,012.1 | |
| March | -6.6 | 10.1 | 3,097.7 | |
| April | 0 | 3,134.3 | 9,099.7 | |
| May | 989.3 | 6,640.3 | 10,826.1 | |
| June | 3,644.7 | 7,711.3 | 11,816.7 | |
| July | 4,024.5 | 7,587.4 | 12,074.2 | |
| August | 1,739.1 | 5,762.6 | 10,102.3 | |
| September | 0 | 3,831.7 | 8,964.7 | |
| October | 0 | 1,426.1 | 5,565.2 | |
| November | -0.2 | 0 | 1,272.6 | |
| December | -2.6 | 0 | 255.3 |
All values in cubic feet per second (cfs).
Common questions
- When does Feeder Canal at Grand Coulee, WA normally run highest?
- June, on the long-term record. The median daily flow that month is about 7,711.3 cfs, against 0 cfs in January, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Feeder Canal at Grand Coulee, WA?
- It depends on the month. In January, half of days historically fall near 0 cfs, with the middle 80% of days between -129.3 and 40.2 cfs. The month-by-month table on this page gives the full range.
- How long has Feeder Canal at Grand Coulee, WA been measured?
- Discharge records at USGS site 12435500 begin in 1952, about 74 years, covering roughly 8,759 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Feeder Canal at Grand Coulee, WA?
- The gauge sits at 47.95126, -118.99558, in Washington, in hydrologic subbasin 17020001, at an elevation of about 1,570 feet.
- Can I use Feeder Canal at Grand Coulee, WA 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.