What time is high tide in Castle Islands, Duncan Canal, AK today?

High tide in Castle Islands, Duncan Canal, AK today (Wednesday, July 8) is at 7:56 AM (11.1 ft) and 8:14 PM (14.4 ft), local station time (AKST). Heights are measured in feet above MLLW.

What time is low tide in Castle Islands, Duncan Canal, AK today?

Low tide in Castle Islands, Duncan Canal, AK today (Wednesday, July 8) is at 1:21 AM (2.2 ft) and 1:15 PM (2.9 ft), local station time (AKST).

How big are the tides in Castle Islands, Duncan Canal, AK this week?

Over the next seven days the water at Castle Islands, Duncan Canal, AK spans 22.0 ft — from a low of -3.8 ft at 7:38 AM on Tue, Jul 14 to a high of 18.2 ft at 1:05 AM on Tue, Jul 14.

When is the next minus tide at Castle Islands, Duncan Canal, AK?

The next minus tide at Castle Islands, Duncan Canal, AK is -0.6 ft at 4:54 AM on Sat, Jul 11. Minus tides drop below the MLLW zero line and expose the most shoreline — the best windows for tidepooling, clamming, and beachcombing.

How accurate are tide predictions for Castle Islands, Duncan Canal, AK?

Predictions come from NOAA harmonic analysis of long-term water level records at this station, which is why tide tables can be published years in advance. Astronomical timing is very reliable, but actual water level can run higher or lower with sustained wind, barometric pressure, and river flow — Perigee overlays live observed water levels on the chart above so you can see today's difference.

Explore / Station 9451321

Castle Islands, Duncan Canal, AK

56.6433°N · 133.1520°W

Next tide

No predictions

Water level

no sensor

Wind

no sensor

Water temp

no sensor

Air temp

no sensor

Tide curve

Reading the gauge…

Activity planner

Choose what you are heading out for

Perigee turns the same tide, wind, light, moon, and water-level readings into a practical read for the day you are planning.

Fishing outlook

Cautionlive read

Use wind, water temperature, and local knowledge until tide timing is available.

Recommended window

Wed 7:26 PM

Current read

Use the live station read, then refresh once more data loads.

Heads up

NOAA did not return tide predictions for this station window.

Why this read

Next tide

No prediction

NOAA did not return tide predictions for this station window.

Wind

No forecast

Check the local marine forecast before committing.

Moon

Computing

Moon phase will refine fishing and photo reads.

Water temp

No sensor

This station does not publish water temperature right now.

Planning aid only. Verify local conditions, posted restrictions, and official marine guidance before acting on the read.

The sky here

Computing…

Datums

Datum	ft
STNDStation Datum	0
MHHWMean Higher-High Water	31.67
MHWMean High Water	30.78
DTLMean Diurnal Tide Level	23.75
MTLMean Tide Level	24.07
MSLMean Sea Level	23.85
MLWMean Low Water	17.35
MLLWMean Lower-Low Water	15.84
GTGreat Diurnal Range	15.83
MNMean Range of Tide	13.43
DHQMean Diurnal High Water Inequality	0.88
DLQMean Diurnal Low Water Inequality	1.52
HWIGreenwich High Water Interval (in hours)	9.8
LWIGreenwich Low Water Interval (in hours)	3.29
NAVD88North American Vertical Datum of 1988	19.04

Wind forecast

Reading the forecast…

Tide times for Castle Islands, Duncan Canal, AK

Today, Wednesday, July 8, in Castle Islands, Duncan Canal, AK, high tide is at 7:56 AM (11.1 ft) and 8:14 PM (14.4 ft), and low tide is at 1:21 AM (2.2 ft) and 1:15 PM (2.9 ft) (AKST). Sunrise is at 4:14 AM and sunset is at 9:42 PM AKST. Heights are in feet above MLLW, the chart datum.

The moon is a last quarter today, 46% illuminated.

7-day tide table (AKST)

High and low tide times for Castle Islands, Duncan Canal, AK for the next seven days, with sunrise and sunset. Times are local (AKST); heights in feet above MLLW.
Day	High tides	Low tides	Sunrise	Sunset
Today, Wed, Jul 8	7:56 AM (11.1 ft) 8:14 PM (14.4 ft)	1:21 AM (2.2 ft) 1:15 PM (2.9 ft)	4:14 AM	9:42 PM
Thu, Jul 9	9:12 AM (11.0 ft) 9:14 PM (14.9 ft)	2:30 AM (1.6 ft) 2:17 PM (3.9 ft)	4:15 AM	9:41 PM
Fri, Jul 10	10:23 AM (11.5 ft) 10:13 PM (15.7 ft)	3:44 AM (0.6 ft) 3:29 PM (4.4 ft)	4:17 AM	9:40 PM
Sat, Jul 11	11:28 AM (12.4 ft) 11:12 PM (16.6 ft)	4:54 AM (-0.6 ft) 4:42 PM (4.3 ft)	4:18 AM	9:39 PM
Sun, Jul 12	12:28 PM (13.4 ft)	5:55 AM (-1.9 ft) 5:47 PM (3.8 ft)	4:20 AM	9:38 PM
Mon, Jul 13	12:10 AM (17.5 ft) 1:21 PM (14.5 ft)	6:49 AM (-3.1 ft) 6:46 PM (3.0 ft)	4:21 AM	9:37 PM
Tue, Jul 14	1:05 AM (18.2 ft) 2:09 PM (15.3 ft)	7:38 AM (-3.8 ft) 7:38 PM (2.2 ft)	4:22 AM	9:36 PM

NOAA harmonic predictions for station 9451321, datum MLLW, station local time. Updated daily. Predictions are for planning, not navigation.

Castle Islands, Duncan Canal, AK tide questions

What time is high tide in Castle Islands, Duncan Canal, AK today?: High tide in Castle Islands, Duncan Canal, AK today (Wednesday, July 8) is at 7:56 AM (11.1 ft) and 8:14 PM (14.4 ft), local station time (AKST). Heights are measured in feet above MLLW.
What time is low tide in Castle Islands, Duncan Canal, AK today?: Low tide in Castle Islands, Duncan Canal, AK today (Wednesday, July 8) is at 1:21 AM (2.2 ft) and 1:15 PM (2.9 ft), local station time (AKST).
How big are the tides in Castle Islands, Duncan Canal, AK this week?: Over the next seven days the water at Castle Islands, Duncan Canal, AK spans 22.0 ft — from a low of -3.8 ft at 7:38 AM on Tue, Jul 14 to a high of 18.2 ft at 1:05 AM on Tue, Jul 14.
When is the next minus tide at Castle Islands, Duncan Canal, AK?: The next minus tide at Castle Islands, Duncan Canal, AK is -0.6 ft at 4:54 AM on Sat, Jul 11. Minus tides drop below the MLLW zero line and expose the most shoreline — the best windows for tidepooling, clamming, and beachcombing.
How accurate are tide predictions for Castle Islands, Duncan Canal, AK?: Predictions come from NOAA harmonic analysis of long-term water level records at this station, which is why tide tables can be published years in advance. Astronomical timing is very reliable, but actual water level can run higher or lower with sustained wind, barometric pressure, and river flow — Perigee overlays live observed water levels on the chart above so you can see today's difference.

About station 9451321

Castle Islands, Duncan Canal, AK is NOAA tide station 9451321, at 56.6433°N, 133.1520°W, in service since 1972. Perigee charts its tide predictions and six-minute water level observations live from NOAA CO-OPS, alongside wind, temperature, and the sun and moon over this spot. The mean tidal range here is 13.4 ft (great diurnal range 15.8 ft). Tides here are mixed — the two daily highs (and the two lows) differ noticeably in height. Everything on this page is also available from the free Perigee API and MCP server. Browse every gauge on this coast on the Alaska tide charts page, or read how tide predictions work.

Plan around this station

Free email

Get Castle Islands, Duncan Canal, AK in your inbox

Join the launch list for weekly highs, lows, moon phase, and standout windows for this station.

Nearby stations

Beecher Pass, AK 7 mi
Anchor Point, AK 9 mi
Papke's Landing, AK 9 mi
Point Lockwood, Woewodski Island, AK 9 mi
Turn Point, AK 13 mi
Petersburg, AK 14 mi
Ideal Cove, Mitkof Island 20 mi
Cosmos Point, AK 20 mi