Alaska
Custom House Cove
Mary Island · Alaska · NOAA station 9450296 · Tide predictions
55.1000, -131.2170
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48-hour outlook
Drag across the curve to inspect any time. Weather icons show the forecast at each high tide.
Drawn from the high/low predictions — NOAA publishes high/low only for this station.
The next seven days
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H = high tide · L = low tide · highs & lows in local time
On the water nearby
Central Dixon Entrance Buoy buoy · 70 mi SW · Station 46145
Wind & wave reports →
Last light, longer plans
Daylight calendar for Ketchikan → Alaska Daylight · Northern lights forecast for Ketchikan → Alaska Aurora Forecast
Nearby tide stations
- Alva Bay, Revillagigedo Island · 9.5 mi N
- Kah Shakes Cove · 10.2 mi SE
- Morse Cove, Duke Island · 12.5 mi S
- Tamgas Harbor, Annette Island · 13.1 mi W
- Metlakatla, Port Chester · 14.0 mi W
Plan ahead
2027 tide extremes for this station
Highest predicted high tide: 18.5 ft — Fri Jan 22 · 12:08 PM
Lowest predicted low tide: -3.8 ft — Mon Jul 5 · 8:22 AM
Biggest single-day swing: 21.9 ft on Fri Jan 22
Best daytime minus tides of 2027
| Date | Low tide | Height |
|---|---|---|
| Mon Jul 5 | 8:22 AM | -3.8 ft |
| Tue Aug 3 | 8:04 AM | -3.7 ft |
| Sun Jul 4 | 7:37 AM | -3.6 ft |
| Mon Aug 2 | 7:21 AM | -3.6 ft |
| Tue Jul 6 | 9:06 AM | -3.5 ft |
| Fri Jan 22 | 6:46 PM | -3.4 ft |
| Sun Jun 6 | 8:33 AM | -3.4 ft |
| Sat Jun 5 | 7:48 AM | -3.3 ft |
| Wed Aug 4 | 8:45 AM | -3.2 ft |
| Mon Jun 7 | 9:20 AM | -3.1 ft |
192 minus tides (below 0 ft) are predicted here in 2027. The table shows up to the 10 lowest that fall between 7 AM and 7 PM — the ones worth planning a clam dig or tidepool walk around.
About this station
Custom House Cove, Mary Island is one of NOAA's reference tide stations — its predictions are computed directly from harmonic analysis of water levels observed here, and other nearby stations are calculated from it.
Alaska holds the country's most extreme tides: Inside Passage channels, Cook Inlet swings past 30 ft, and Arctic stations where the tide is measured in inches and wind setup runs the show.