Sergius Narrows — AK, United States

Tidal currents & slack water

↑3.5 kn↑1.7 kn↑3.2 kn06:1212:1818:37Now
Tidal current at Sergius Narrows, computed from harmonic constituents. Slack water on Mon 19 Oct 2026 at 18:37.
↑7:45am↓5:47pm

Predictions are not observations — conditions vary with weather and river flow. Not for navigation.

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Slack water and maximums for the next 7 days

Mon 19 Oct 2026 through Sun 25 Oct 2026. All times are local to Sergius Narrows (America/Sitka). What slack water is, and why it isn’t high or low tide.
DayCurrentTimeSpeed
Mon 19 Oct 2026Max flood3.5 kn
Mon 19 Oct 2026Slack
Mon 19 Oct 2026Max ebb1.7 kn
Mon 19 Oct 2026Slack
Mon 19 Oct 2026Max flood3.2 kn
Mon 19 Oct 2026Slack
Mon 19 Oct 2026Max ebb2.0 kn
Tue 20 Oct 2026Slack
Tue 20 Oct 2026Max flood3.6 kn
Tue 20 Oct 2026Slack
Tue 20 Oct 2026Max ebb2.3 kn
Tue 20 Oct 2026Slack
Tue 20 Oct 2026Max flood3.6 kn
Tue 20 Oct 2026Slack
Tue 20 Oct 2026Max ebb2.8 kn
Wed 21 Oct 2026Slack
Wed 21 Oct 2026Max flood4.2 kn
Wed 21 Oct 2026Slack
Wed 21 Oct 2026Max ebb3.2 kn
Wed 21 Oct 2026Slack
Wed 21 Oct 2026Max flood4.4 kn
Wed 21 Oct 2026Slack
Thu 22 Oct 2026Max ebb3.6 kn
Thu 22 Oct 2026Slack
Thu 22 Oct 2026Max flood5.1 kn
Thu 22 Oct 2026Slack
Thu 22 Oct 2026Max ebb4.0 kn
Thu 22 Oct 2026Slack
Thu 22 Oct 2026Max flood5.5 kn
Thu 22 Oct 2026Slack
Fri 23 Oct 2026Max ebb4.3 kn
Fri 23 Oct 2026Slack
Fri 23 Oct 2026Max flood6.1 kn
Fri 23 Oct 2026Slack
Fri 23 Oct 2026Max ebb4.9 kn
Fri 23 Oct 2026Slack
Fri 23 Oct 2026Max flood6.5 kn
Fri 23 Oct 2026Slack
Sat 24 Oct 2026Max ebb5.1 kn
Sat 24 Oct 2026Slack
Sat 24 Oct 2026Max flood6.9 kn
Sat 24 Oct 2026Slack
Sat 24 Oct 2026Max ebb5.7 kn
Sat 24 Oct 2026Slack
Sat 24 Oct 2026Max flood7.4 kn
Sat 24 Oct 2026Slack
Sun 25 Oct 2026Max ebb5.8 kn
Sun 25 Oct 2026Slack
Sun 25 Oct 2026Max flood7.6 kn
Sun 25 Oct 2026Slack
Sun 25 Oct 2026Max ebb6.5 kn
Sun 25 Oct 2026Slack
Sun 25 Oct 2026Max flood8.0 kn
Sun 25 Oct 2026Slack

Station facts

Position
57.4070° N, 135.6311° W
Time zone
America/Sitka
Source
NOAA harmonic constituents
Region
AK, United States

How we check predictions — dated samples and their limits.

Nearby

All current stations