Portland NOAA Tide Station 8418150

About NOAA station 8418150

The Portland station is a primary Casco Bay reference for the working waterfront, nearby islands, channels, ledges, and access to the Gulf of Maine.

Why people check this station

Its substantial tide range makes it useful for launch depth, shoreline access, harbor current, island crossings, and fishing structure that changes between high and low water.

How to interpret the prediction locally

Islands and narrow passages can shift both water-level timing and current turns. The station predicts height at Portland, not the exact slack-water time at every Casco Bay channel.

Tide height is not current speed

A high or low prediction describes the expected water level at the gauge. Current can turn earlier or later in a nearby inlet, river, bridge opening, pass, or channel. NOAA publishes separate current predictions for supported locations, and local weather can move the observed level above or below the astronomical prediction.

Basic station-planning checklist

1. Confirm that station 8418150 represents the water you intend to use.
2. Note the predicted high and low times, heights, and overall range.
3. Check wind, waves, visibility, precipitation, and official warnings.
4. Allow for the local offset between the gauge and your exact location.
5. Verify actual water, access, navigation, and regulations before departure.

Planning only: Data can be delayed, unavailable, or unrepresentative of a nearby micro-location. Never use this page as a substitute for official charts, notices, warnings, or direct observation.

Official references

• NOAA CO-OPS station 8418150
• NOAA tide predictions for Portland
• NOAA tide and current FAQs
• National Weather Service marine forecasts