Alaska
Block Island
Tlevak Narrows · Alaska · NOAA station 9450406 · Tide predictions
55.2633, -133.1150
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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 · 68 mi SE · 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
- Natalia Point · 3.5 mi SE
- Soda Bay · 5.9 mi E
- North Pass, West End · 8.0 mi SE
- TROCADERO BAY · 9.3 mi NE
- Sea Otter Harbor · 9.7 mi S
Plan ahead
2027 tide extremes for this station
Highest predicted high tide: 14.7 ft — Fri Jan 22 · 12:15 PM
Lowest predicted low tide: -3.2 ft — Mon Jul 5 · 8:39 AM
Biggest single-day swing: 17.3 ft on Fri Jan 22
Best daytime minus tides of 2027
| Date | Low tide | Height |
|---|---|---|
| Mon Jul 5 | 8:39 AM | -3.2 ft |
| Sun Jul 4 | 7:53 AM | -3.0 ft |
| Sun Jun 6 | 8:52 AM | -3.0 ft |
| Tue Jul 6 | 9:23 AM | -2.9 ft |
| Sat Jun 5 | 8:06 AM | -2.8 ft |
| Mon Jun 7 | 9:40 AM | -2.8 ft |
| Tue Aug 3 | 8:18 AM | -2.7 ft |
| Mon Aug 2 | 7:35 AM | -2.7 ft |
| Fri Jan 22 | 6:59 PM | -2.5 ft |
| Sat Jul 3 | 7:06 AM | -2.5 ft |
180 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
NOAA builds the predictions for Block Island, Tlevak Narrows from the Sitka station: high tides about 1.20× the height, 7 min later; low tides about the same height, 2 min later.
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.