USGS Streamgage 14166000
Willamette River at Harrisburg, OR
Willamette River at Harrisburg, OR is USGS streamgage 14166000 in Oregon, monitoring river discharge in hydrologic subbasin 17090003. It drains a watershed of about 3,420 square miles. Discharge records at this site go back to 1861. Typical flow runs near 4,653.9 cfs in July and 10,458.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Oregon
- Drainage area
- 3,420 sq mi
- Subbasin (HUC-8)
- 17090003
- Coordinates
- 44.2704, -123.1737
- USGS site number
- 14166000
- Records begin
- 1861-12-01 (165 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 82 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 | 6,587.1 | 16,725.8 | 40,858.1 | |
| February | 6,023.4 | 11,869 | 32,106.9 | |
| March | 6,016.8 | 10,823.2 | 26,696.8 | |
| April | 5,859.3 | 10,458.3 | 20,460 | |
| May | 5,317.7 | 9,831.6 | 17,800 | |
| June | 4,479.7 | 6,907.3 | 13,037.7 | |
| July | 3,877.4 | 4,653.9 | 6,133.2 | |
| August | 3,696.8 | 4,844.5 | 5,878.4 | |
| September | 3,608.7 | 5,292.3 | 7,800.3 | |
| October | 3,874.8 | 6,598.4 | 10,224.5 | |
| November | 4,585.7 | 10,471.3 | 24,910 | |
| December | 5,475.2 | 15,400 | 40,529 |
All values in cubic feet per second (cfs).