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 sits on the Siuslaw River, alongside 1 other gauge Rivermatics tracks on the same river. 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. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead, alongside daily high and low water-temperature forecasts.
View live conditions & forecast →
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)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for Siuslaw River near Mapleton, OR. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 145 | 151 | 158 | ||
| 139 | 150 | 171 | ||
| 136 | 155 | 202 | ||
| 127 | 148 | 191 | ||
| 119 | 137 | 169 | ||
| 112 | 129 | 154 | ||
| 107 | 122 | 144 | ||
| 102 | 117 | 140 | ||
| 99.1 | 115 | 135 | ||
| 95.9 | 112 | 133 | ||
| 91.7 | 107 | 127 | ||
| 88.5 | 104 | 123 | ||
| 86.1 | 101 | 121 | ||
| 84.1 | 99.3 | 118 |
All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.
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).
Common questions
- When does Siuslaw River near Mapleton, OR normally run highest?
- January, on the long-term record. The median daily flow that month is about 3,073.9 cfs, against 117.7 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Siuslaw River near Mapleton, OR?
- It depends on the month. In January, half of days historically fall near 3,073.9 cfs, with the middle 80% of days between 1,226.2 and 10,714.2 cfs. The month-by-month table on this page gives the full range.
- How long has Siuslaw River near Mapleton, OR been measured?
- Discharge records at USGS site 14307620 begin in 1967, about 59 years, covering roughly 9,075 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Siuslaw River near Mapleton, OR?
- Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. A companion model forecasts each day's water-temperature high and low. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
- Where is Siuslaw River near Mapleton, OR?
- The gauge sits at 44.06234, -123.88317, in Oregon, in hydrologic subbasin 17100206, draining roughly 588 square miles.
- Can I use Siuslaw River near Mapleton, 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.
Upstream and downstream on the Siuslaw River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Siuslaw River in full.
- Siuslaw River near Alma, OR 157 sq mi
- Siuslaw River near Mapleton, OR this page