USGS Streamgage 14305500
Siletz River at Siletz, OR
Siletz River at Siletz, OR is USGS streamgage 14305500 in Oregon, monitoring river discharge in hydrologic subbasin 17100204. It drains a watershed of about 202 square miles. Discharge records at this site go back to 1905. Typical flow runs near 193.9 cfs in July and 1,158.4 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Oregon
- Drainage area
- 202 sq mi
- Subbasin (HUC-8)
- 17100204
- Coordinates
- 44.71512, -123.88733
- USGS site number
- 14305500
- Records begin
- 1905-10-01 (121 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 121 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 | 905.5 | 2,264.2 | 6,955.5 | |
| February | 782.1 | 1,953.4 | 6,066.9 | |
| March | 742.5 | 1,670.6 | 4,441.9 | |
| April | 585 | 1,158.4 | 2,775 | |
| May | 348.7 | 641.4 | 1,612.3 | |
| June | 192.5 | 361.7 | 918.3 | |
| July | 116.6 | 193.9 | 343.8 | |
| August | 74.1 | 110.6 | 188.8 | |
| September | 64.4 | 99.9 | 384.2 | |
| October | 83.2 | 294.9 | 1,712 | |
| November | 350.1 | 1,525.7 | 5,634.3 | |
| December | 793 | 2,271 | 7,141.6 |
All values in cubic feet per second (cfs).