USGS Streamgage 14307620
Siuslaw River near Mapleton, OR
Siuslaw River near Mapleton, OR is USGS streamgage 14307620 in Oregon, monitoring river discharge in hydrologic subbasin 17100206. It drains a watershed of about 588 square miles. Discharge records at this site go back to 1967. Typical flow runs near 231.6 cfs in July and 1,779.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Oregon
- Drainage area
- 588 sq mi
- Subbasin (HUC-8)
- 17100206
- Coordinates
- 44.06234, -123.88317
- USGS site number
- 14307620
- Records begin
- 1967-10-01 (59 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 59 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 | 1,226.2 | 3,073.9 | 10,714.2 | |
| February | 1,098.1 | 2,641.7 | 8,895.9 | |
| March | 1,201.9 | 2,549 | 7,205.8 | |
| April | 947.5 | 1,779.3 | 4,192.7 | |
| May | 534.2 | 894.8 | 1,916.5 | |
| June | 294.8 | 473.3 | 1,167.5 | |
| July | 153.9 | 231.6 | 404.2 | |
| August | 82.9 | 134.1 | 221.2 | |
| September | 74.4 | 117.7 | 276 | |
| October | 92.2 | 210.8 | 866 | |
| November | 271.7 | 1,094.6 | 4,903.7 | |
| December | 721.8 | 2,901.3 | 10,496.8 |
All values in cubic feet per second (cfs).