Rivermatics

USGS Streamgage 14211820

Columbia Slough at Portland, OR

Columbia Slough at Portland, OR is USGS streamgage 14211820 in Oregon, monitoring river discharge in hydrologic subbasin 17090012. Discharge records at this site go back to 1988. Typical flow runs near 95.3 cfs in July and 107.4 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.

View live conditions & forecast →

Gauge details

State
Oregon
Subbasin (HUC-8)
17090012
Coordinates
45.63901, -122.76315
USGS site number
14211820
Records begin
1988-10-14 (38 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Columbia Slough at Portland, 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.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
44 86.8 116
34 85.5 137
33.7 88.7 154
11.8 76 140
10 78.8 144
5.7 63.3 122
5.4 63.2 120
7.7 74 134
28.1 67.9 111
28.7 67.7 108
23 67.1 114
6.6 71 131
6.2 69.5 130
10.6 64.8 124

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 37 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 16.7 153.5 316.7
February 25.4 147 325.9
March -1.1 131.5 276.1
April -51 107.4 271.7
May -133.4 68.2 234.4
June -98.9 87.7 273.7
July 1.8 95.3 209.1
August 1.9 78.5 161.8
September -0.8 73 148.5
October 5.9 86.9 174.9
November 13.4 108.6 213.4
December 4 128.3 299.2

All values in cubic feet per second (cfs).

Common questions

When does Columbia Slough at Portland, OR normally run highest?
January, on the long-term record. The median daily flow that month is about 153.5 cfs, against 68.2 cfs in May, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Columbia Slough at Portland, OR?
It depends on the month. In January, half of days historically fall near 153.5 cfs, with the middle 80% of days between 16.7 and 316.7 cfs. The month-by-month table on this page gives the full range.
How long has Columbia Slough at Portland, OR been measured?
Discharge records at USGS site 14211820 begin in 1988, about 38 years, covering roughly 8,653 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Columbia Slough at Portland, 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. 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 Columbia Slough at Portland, OR?
The gauge sits at 45.63901, -122.76315, in Oregon, in hydrologic subbasin 17090012.
Can I use Columbia Slough at Portland, 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.

Other gauges in this subbasin