Custom House Cove, Mary Island tide predictions
55.1000, -131.2170 · NOAA station 9450296
Full daylight calendar for the Ketchikan area → Alaska Daylight · Northern lights forecast for Ketchikan → Alaska Aurora Forecast
Nearest buoy: Central Dixon Entrance Buoy · 70 mi SW — live wind & wave reports
Tide now
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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.
7-day tides
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H = high tide · L = low tide
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.
Inside Passage waters are sheltered, but the ranges are real: 15 to 20 ft swings are routine, and narrow channels run strong tidal currents on the change. Out here, rain and channel weather matter more than ice.
2027 tide extremes
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.
Nearest 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