Columbia Slough at Portland — OR, United States

Tide times & tide chart

Mostly seasonal — the yearly change in water level here is about 3.5 times the daily tide.

-1.1 ft12:51am-3.0 ft8:15am-2.0 ft2:11pm-2.6 ft7:28pmNow
Tide predictions for Columbia Slough at Portland, computed from harmonic constituents. High -1.1 feet on Mon 19 Oct 2026 at 00:50, low -3.0 feet on Mon 19 Oct 2026 at 08:20, above MLLW, the chart datum.
↑7:33am↓6:18pm

Predictions are not observations — conditions vary with weather and river flow. Not for navigation.

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Tide times for the next 7 days

Mon 19 Oct 2026 through Sun 25 Oct 2026. All times are local to Columbia Slough at Portland (America/Los_Angeles). Heights are in feet above MLLW.
DayTideTimeHeight
Mon 19 Oct 2026High-1.1 ft
Mon 19 Oct 2026Low-3.0 ft
Mon 19 Oct 2026High-2.0 ft
Mon 19 Oct 2026Low-2.6 ft
Tue 20 Oct 2026High-1.2 ft
Tue 20 Oct 2026Low-3.0 ft
Tue 20 Oct 2026High-1.7 ft
Tue 20 Oct 2026Low-2.6 ft
Wed 21 Oct 2026High-1.1 ft
Wed 21 Oct 2026Low-2.9 ft
Wed 21 Oct 2026High-1.3 ft
Wed 21 Oct 2026Low-2.5 ft
Thu 22 Oct 2026High-0.8 ft
Thu 22 Oct 2026Low-2.8 ft
Thu 22 Oct 2026High-0.8 ft
Thu 22 Oct 2026Low-2.4 ft
Fri 23 Oct 2026High-0.6 ft
Fri 23 Oct 2026Low-2.6 ft
Fri 23 Oct 2026High-0.3 ft
Fri 23 Oct 2026Low-2.2 ft
Sat 24 Oct 2026High-0.3 ft
Sat 24 Oct 2026Low-2.3 ft
Sat 24 Oct 2026High0.3 ft
Sun 25 Oct 2026Low-1.9 ft
Sun 25 Oct 2026High0.0 ft
Sun 25 Oct 2026Low-2.0 ft
Sun 25 Oct 2026High0.7 ft

Station facts

Position
45.6390° N, 122.7632° W
Time zone
America/Los_Angeles
Datum
MLLW datum · computed from harmonic constituents
Source
Harmonic constituents from TICON-4
Region
OR, United States

Heights are measured above chart datum. A negative height means there is that much less water than the charted depth shows.

Slackwater database (https://github.com/openwatersio/slackwater-database). Source: Hart-Davis, M., Dettmering, D., Seitz, F. (2025), TICON-4: TIdal CONstants based on GESLA-4 sea-level records, SEANOE, https://doi.org/10.17882/109129. Licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Modified: see https://github.com/openwatersio/slackwater-database#modifications-to-source-data

How we check predictions — dated samples and their limits.

Nearby

All tide stations