Astoria (Columbia River), OR tide times

Predictions: NOAA CO-OPS station 9439040 — heights relative to MLLW.

Harmonic prediction from the official tide authority. Very high accuracy under normal conditions; storm surge may shift actual water level. Not for navigation.

Marine-conditions data not available for this station. Wind, swell and water temperature ride along with Open-Meteo Marine; gauge-only stations (e.g. UK EA Flood) publish water level only.

Predictions: NOAA CO-OPS station 9439040 — heights relative to MLLW. · Not for navigation.

The angler tradition for major/minor fishing windows: major ≈3-hour windows around moon transit and opposition; minor ≈2-hour windows around moonrise and moonset. Times are America/Los Angeles local. Folk tradition, not a scientific forecast.

Next spring tide on Sun 17 May (range 3.6m / 11.8ft). Last neap on Fri 15 May. Next neap on Sun 24 May.

Spring tides cluster around new and full moons (biggest swings). Neap tides land on quarter moons (smallest swings). See the spring tide and neap tide glossary entries for the why.

Astoria sits on the south bank of the Columbia River near its mouth, where the second-largest river by volume in the United States meets the Pacific across one of the most dangerous bar crossings in North America. The tide gauge at the Tongue Point pier reads a complicated signal: the open-Pacific mixed-semidiurnal tide pushing inland against the river's seaward current. Mean range at Astoria is about 2.4 metres, climbing past 2.9 on spring tides. The pattern is mixed semidiurnal, two highs and two lows of unequal size each day, the bigger swing falling on the lower-low water. The Columbia Bar at the mouth — between the south jetty at Fort Stevens and the north jetty across in Washington — is the ship-traffic chokepoint, and the rip and breaking water at the bar on a strong ebb against an incoming Pacific swell is what the Coast Guard's motor lifeboat school exists to train against. Photographers on the Astoria Riverwalk and bird-walkers at the Trestle Bay reserve at the Lewis and Clark NWR read the table for the lowest lows and the calm slack-water windows. Predictions on this page come from NOAA CO-OPS station 9439040. Pacific storm surge in winter can lift water levels 20 cm or more above predicted; the table assumes calm.