USGS Streamgage 14306500
Alsea River near Tidewater, OR
Alsea River near Tidewater, OR is USGS streamgage 14306500 in Oregon, monitoring river discharge in hydrologic subbasin 17100205. It drains a watershed of about 334 square miles. Discharge records at this site go back to 1939. Typical flow runs near 183.3 cfs in July and 1,224.4 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
- 334 sq mi
- Subbasin (HUC-8)
- 17100205
- Coordinates
- 44.38595, -123.83178
- USGS site number
- 14306500
- Records begin
- 1939-10-01 (87 years)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for Alsea River near Tidewater, 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 |
|---|---|---|---|---|
| 83.6 | 86.5 | 89.5 | ||
| 84.2 | 93 | 118 | ||
| 86.8 | 104 | 148 | ||
| 82.7 | 96.6 | 129 | ||
| 77.8 | 88.4 | 109 | ||
| 73.7 | 82.5 | 96.5 | ||
| 71 | 79.1 | 90.9 | ||
| 69.1 | 77 | 88 | ||
| 67.5 | 75.5 | 86.3 | ||
| 66 | 73.9 | 84.2 | ||
| 64.8 | 72.5 | 82.2 | ||
| 63.8 | 71.3 | 80.8 | ||
| 62.5 | 70.2 | 79.9 | ||
| 61.7 | 69.4 | 78.9 |
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 87 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 | 924.8 | 2,427.1 | 7,396.5 | |
| February | 860.3 | 2,137.2 | 6,645.5 | |
| March | 831.3 | 1,887.4 | 5,056.1 | |
| April | 666.5 | 1,224.4 | 2,936 | |
| May | 407 | 650.3 | 1,426.5 | |
| June | 232.4 | 349.5 | 699.6 | |
| July | 126.2 | 183.3 | 271.2 | |
| August | 77.5 | 109 | 158.2 | |
| September | 67.4 | 92.4 | 203.1 | |
| October | 74.9 | 158.9 | 747.2 | |
| November | 196 | 952.4 | 4,016.7 | |
| December | 638.3 | 2,191 | 7,482.9 |
All values in cubic feet per second (cfs).
Common questions
- When does Alsea River near Tidewater, OR normally run highest?
- January, on the long-term record. The median daily flow that month is about 2,427.1 cfs, against 92.4 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 Alsea River near Tidewater, OR?
- It depends on the month. In January, half of days historically fall near 2,427.1 cfs, with the middle 80% of days between 924.8 and 7,396.5 cfs. The month-by-month table on this page gives the full range.
- How long has Alsea River near Tidewater, OR been measured?
- Discharge records at USGS site 14306500 begin in 1939, about 87 years, covering roughly 9,200 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Alsea River near Tidewater, 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 Alsea River near Tidewater, OR?
- The gauge sits at 44.38595, -123.83178, in Oregon, in hydrologic subbasin 17100205, draining roughly 334 square miles.
- Can I use Alsea River near Tidewater, 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.