Castle Islands, Duncan Canal tide chart
Alaska · near Petersburg (14 mi) · NOAA station 9451321 · times in local time (AKDT)
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Tides today, Sunday, October 11
- High 1:58 AM 16.5 ft
- Low 7:44 AM 0.6 ft
- High 2:02 PM 18.0 ft
- Low 8:13 PM -1.9 ft
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Sunrise 7:17 AM · Sunset 6:02 PM · New moon (0%)
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Weather and conditions at Castle Islands, Duncan Canal
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Marine forecast: Sumner Strait
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Marine radio: weather channels and VHF
NOAA Weather Radio
- 162.450 MHz WX5 KZZ91, Zarembo Island, AK (23 mi)
- 162.400 MHz WX2 WXJ83, Wrangell, AK (31 mi)
To get alerts on a weather alert radio, program county code 002195 (Petersburg Borough).
VHF marine channels
- Ch 16 Distress, safety and calling
- Ch 9 Boater-to-boater calling
- Ch 22A Coast Guard safety broadcasts
- Ch 13 Bridge-to-bridge (big ships, drawbridges)
- Ch 68, 69, 71, 72, 78A Recreational chat
Weather radio broadcasts are continuous; VHF channels are the US standard. Local harbors and bridges may use others, so check your chart.
Live readings from NOAA and the National Weather Service, loaded when you open this page.
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Tide times this week
| Day | High and low tides | Sunrise / sunset | Moon |
|---|---|---|---|
| Sun Oct 11 | H 1:58 AM 16.5 ftL 7:44 AM 0.6 ftH 2:02 PM 18.0 ftL 8:13 PM -1.9 ft | 7:17 AM / 6:02 PM | New moon (0%) |
| Mon Oct 12 | H 2:36 AM 16.1 ftL 8:13 AM 1.3 ftH 2:34 PM 17.7 ftL 8:44 PM -1.6 ft | 7:19 AM / 6:00 PM | New moon (2%) |
| Tue Oct 13 | H 3:13 AM 15.4 ftL 8:43 AM 2.2 ftH 3:06 PM 17.0 ftL 9:17 PM -1.0 ft | 7:21 AM / 5:57 PM | Waxing crescent (7%) |
| Wed Oct 14 | H 3:51 AM 14.5 ftL 9:13 AM 3.2 ftH 3:39 PM 16.1 ftL 9:52 PM 0.0 ft | 7:24 AM / 5:55 PM | Waxing crescent (13%) |
| Thu Oct 15 | H 4:32 AM 13.4 ftL 9:46 AM 4.3 ftH 4:13 PM 14.9 ftL 10:32 PM 1.1 ft | 7:26 AM / 5:52 PM | Waxing crescent (21%) |
| Fri Oct 16 | H 5:19 AM 12.2 ftL 10:24 AM 5.4 ftH 4:51 PM 13.7 ftL 11:18 PM 2.2 ft | 7:28 AM / 5:50 PM | Waxing crescent (30%) |
| Sat Oct 17 | H 6:19 AM 11.2 ftL 11:11 AM 6.4 ftH 5:46 PM 12.5 ft | 7:30 AM / 5:47 PM | First quarter (40%) |
Tidal currents near Castle Islands, Duncan Canal
From NOAA's current predictions for Spike Rock, 7.3 miles away. Slack is when the current turns and the water is calmest; flood runs in with the rising tide and ebb runs out with the falling tide. Times are the peak of each run, in knots. The flood runs toward the N (5°) and the ebb toward the S (185°). The strongest current this week is 6.8 knots.
| Day | Slack water and peak currents |
|---|---|
| Sun Oct 11 | Slack 2:07 AMEbb 5:47 AM 6.0 knSlack 8:32 AMFlood 11:33 AM 6.0 knSlack 2:13 PMEbb 6:02 PM 6.7 knSlack 8:55 PMFlood 11:57 PM 6.2 kn |
| Mon Oct 12 | Slack 2:42 AMEbb 6:20 AM 5.6 knSlack 9:03 AMFlood 12:07 PM 5.7 knSlack 2:45 PMEbb 6:32 PM 6.3 knSlack 9:26 PM |
| Tue Oct 13 | Flood 12:32 AM 5.9 knSlack 3:18 AMEbb 6:51 AM 4.9 knSlack 9:30 AMFlood 12:40 PM 5.2 knSlack 3:18 PMEbb 6:54 PM 5.8 knSlack 9:54 PM |
| Wed Oct 14 | Flood 1:07 AM 5.5 knSlack 3:54 AMEbb 7:11 AM 4.2 knSlack 9:55 AMFlood 1:14 PM 4.6 knSlack 3:52 PMEbb 6:49 PM 5.3 knSlack 10:22 PM |
| Thu Oct 15 | Flood 1:44 AM 4.9 knSlack 4:34 AMEbb 7:04 AM 3.5 knSlack 10:20 AMFlood 1:52 PM 3.9 knSlack 4:30 PMEbb 7:12 PM 4.8 knSlack 10:53 PM |
| Fri Oct 16 | Flood 2:25 AM 4.2 knSlack 5:20 AMEbb 7:33 AM 2.9 knSlack 10:50 AMFlood 2:35 PM 3.2 knSlack 5:14 PMEbb 7:49 PM 4.1 knSlack 11:30 PM |
| Sat Oct 17 | Flood 3:15 AM 3.5 knSlack 6:13 AMEbb 8:14 AM 2.2 knSlack 11:28 AMFlood 3:28 PM 2.5 knSlack 6:07 PMEbb 8:33 PM 3.2 kn |
Current predictions can differ a lot over short distances: check the station location on NOAA before planning a passage.
Best fishing times at Castle Islands, Duncan Canal
The bite score (0 to 100) adds up what anglers watch most: moving water (a tide running harder than usual here scores higher), solunar periods (major periods of about two hours centred on the moon overhead or underfoot, minor periods of about an hour on moonrise and moonset), dawn and dusk light, and how close it is to the new or full moon. Best times are the stretches of the day scoring near that day's top.
| Day | Bite score | Best times | Major periods | Minor periods |
|---|---|---|---|---|
| Sun Oct 11 | 85 · Excellent | 5:00 PM–6:00 PM | 12:12 AM–2:12 AM, 12:34 PM–2:34 PM | 8:43 AM–9:43 AM, 5:12 PM–6:12 PM |
| Mon Oct 12 | 77 · Excellent | 5:00 PM–7:00 PM | 12:58 AM–2:58 AM, 1:21 PM–3:21 PM | 10:09 AM–11:09 AM, 5:23 PM–6:23 PM |
| Tue Oct 13 | 65 · Good | 5:00 PM–7:00 PM | 1:45 AM–3:45 AM, 2:10 PM–4:10 PM | 11:33 AM–12:33 PM, 5:39 PM–6:39 PM |
| Wed Oct 14 | 51 · Fair | 6:00 PM–7:00 PM | 2:34 AM–4:34 AM, 3:00 PM–5:00 PM | 12:49 PM–1:49 PM, 6:06 PM–7:06 PM |
| Thu Oct 15 | 35 · Fair | 5:00 PM–6:00 PM | 3:25 AM–5:25 AM, 3:50 PM–5:50 PM | 1:51 PM–2:51 PM, 6:49 PM–7:49 PM |
| Fri Oct 16 | 33 · Slow | 5:00 PM–6:00 PM | 4:16 AM–6:16 AM, 4:41 PM–6:41 PM | 2:35 PM–3:35 PM, 7:51 PM–8:51 PM |
| Sat Oct 17 | 25 · Slow | 6:00 PM–7:00 PM | 5:06 AM–7:06 AM, 5:31 PM–7:31 PM | 3:02 PM–4:02 PM, 9:07 PM–10:07 PM |
A planning aid, not a guarantee. Wind, water clarity, bait and pressure changes matter too; the forecast above adds live wind and pressure when you open the page.
Best daylight low tides in the next two weeks
The lowest water that falls between sunrise and sunset, for tide pooling and beachcombing.
- 0.6 ft at 7:44 AM on Sunday, October 11
- 1.3 ft at 8:13 AM on Monday, October 12
- 2.2 ft at 8:43 AM on Tuesday, October 13
- 2.6 ft at 5:23 PM on Thursday, October 22
- 3.2 ft at 9:13 AM on Wednesday, October 14
- 4.3 ft at 9:46 AM on Thursday, October 15
Tide table: October 11 to November 10, 2026
Full 2026 tide table Full 2027 tide table
| Day | High and low tides | Sunrise / sunset |
|---|---|---|
| Sun Oct 11 | H 1:58 AM 16.5 ftL 7:44 AM 0.6 ftH 2:02 PM 18.0 ftL 8:13 PM -1.9 ft | 7:17 AM / 6:02 PM |
| Mon Oct 12 | H 2:36 AM 16.1 ftL 8:13 AM 1.3 ftH 2:34 PM 17.7 ftL 8:44 PM -1.6 ft | 7:19 AM / 6:00 PM |
| Tue Oct 13 | H 3:13 AM 15.4 ftL 8:43 AM 2.2 ftH 3:06 PM 17.0 ftL 9:17 PM -1.0 ft | 7:21 AM / 5:57 PM |
| Wed Oct 14 | H 3:51 AM 14.5 ftL 9:13 AM 3.2 ftH 3:39 PM 16.1 ftL 9:52 PM 0.0 ft | 7:24 AM / 5:55 PM |
| Thu Oct 15 | H 4:32 AM 13.4 ftL 9:46 AM 4.3 ftH 4:13 PM 14.9 ftL 10:32 PM 1.1 ft | 7:26 AM / 5:52 PM |
| Fri Oct 16 | H 5:19 AM 12.2 ftL 10:24 AM 5.4 ftH 4:51 PM 13.7 ftL 11:18 PM 2.2 ft | 7:28 AM / 5:50 PM |
| Sat Oct 17 | H 6:19 AM 11.2 ftL 11:11 AM 6.4 ftH 5:46 PM 12.5 ft | 7:30 AM / 5:47 PM |
| Sun Oct 18 | L 12:15 AM 3.2 ftH 7:36 AM 10.7 ftL 12:16 PM 7.2 ftH 7:10 PM 11.6 ft | 7:32 AM / 5:44 PM |
| Mon Oct 19 | L 1:28 AM 3.8 ftH 8:54 AM 11.1 ftL 1:52 PM 7.3 ftH 8:39 PM 11.5 ft | 7:34 AM / 5:42 PM |
| Tue Oct 20 | L 2:55 AM 3.8 ftH 9:53 AM 12.0 ftL 3:42 PM 6.3 ftH 9:48 PM 12.1 ft | 7:36 AM / 5:39 PM |
| Wed Oct 21 | L 4:04 AM 3.1 ftH 10:37 AM 13.2 ftL 4:42 PM 4.5 ftH 10:43 PM 13.1 ft | 7:38 AM / 5:37 PM |
| Thu Oct 22 | L 4:51 AM 2.4 ftH 11:15 AM 14.5 ftL 5:23 PM 2.6 ftH 11:31 PM 14.1 ft | 7:41 AM / 5:35 PM |
| Fri Oct 23 | L 5:29 AM 1.7 ftH 11:51 AM 15.8 ftL 5:59 PM 0.8 ft | 7:43 AM / 5:32 PM |
| Sat Oct 24 | H 12:15 AM 15.1 ftL 6:04 AM 1.1 ftH 12:26 PM 17.0 ftL 6:35 PM -1.0 ft | 7:45 AM / 5:30 PM |
| Sun Oct 25 | H 12:57 AM 16.0 ftL 6:39 AM 0.9 ftH 1:00 PM 17.9 ftL 7:11 PM -2.4 ft | 7:47 AM / 5:27 PM |
| Mon Oct 26 | H 1:39 AM 16.5 ftL 7:14 AM 0.9 ftH 1:36 PM 18.6 ftL 7:49 PM -3.2 ft | 7:49 AM / 5:25 PM |
| Tue Oct 27 | H 2:21 AM 16.6 ftL 7:51 AM 1.3 ftH 2:13 PM 18.9 ftL 8:29 PM -3.5 ft | 7:52 AM / 5:23 PM |
| Wed Oct 28 | H 3:05 AM 16.2 ftL 8:29 AM 1.9 ftH 2:52 PM 18.7 ftL 9:12 PM -3.1 ft | 7:54 AM / 5:20 PM |
| Thu Oct 29 | H 3:51 AM 15.4 ftL 9:11 AM 2.9 ftH 3:34 PM 17.9 ftL 10:01 PM -2.1 ft | 7:56 AM / 5:18 PM |
| Fri Oct 30 | H 4:43 AM 14.4 ftL 9:59 AM 4.0 ftH 4:24 PM 16.7 ftL 10:55 PM -0.8 ft | 7:58 AM / 5:16 PM |
| Sat Oct 31 | H 5:44 AM 13.4 ftL 10:57 AM 5.0 ftH 5:25 PM 15.2 ftL 11:57 PM 0.5 ft | 8:00 AM / 5:13 PM |
| Sun Nov 1 | H 5:55 AM 12.8 ftL 11:11 AM 5.8 ftH 5:43 PM 13.8 ft | 7:03 AM / 4:11 PM |
| Mon Nov 2 | L 12:10 AM 1.6 ftH 7:12 AM 12.9 ftL 12:46 PM 5.8 ftH 7:10 PM 13.1 ft | 7:05 AM / 4:09 PM |
| Tue Nov 3 | L 1:33 AM 2.2 ftH 8:20 AM 13.7 ftL 2:32 PM 4.7 ftH 8:30 PM 13.2 ft | 7:07 AM / 4:07 PM |
| Wed Nov 4 | L 2:50 AM 2.3 ftH 9:15 AM 14.8 ftL 3:43 PM 3.0 ftH 9:35 PM 13.7 ft | 7:09 AM / 4:05 PM |
| Thu Nov 5 | L 3:47 AM 2.1 ftH 10:01 AM 15.8 ftL 4:33 PM 1.3 ftH 10:30 PM 14.3 ft | 7:11 AM / 4:02 PM |
| Fri Nov 6 | L 4:32 AM 2.0 ftH 10:42 AM 16.7 ftL 5:13 PM -0.1 ftH 11:18 PM 14.9 ft | 7:14 AM / 4:00 PM |
| Sat Nov 7 | L 5:10 AM 2.1 ftH 11:20 AM 17.3 ftL 5:48 PM -1.0 ft | 7:16 AM / 3:58 PM |
| Sun Nov 8 | H 12:01 AM 15.2 ftL 5:44 AM 2.3 ftH 11:57 AM 17.7 ftL 6:20 PM -1.5 ft | 7:18 AM / 3:56 PM |
| Mon Nov 9 | H 12:41 AM 15.4 ftL 6:15 AM 2.6 ftH 12:31 PM 17.7 ftL 6:52 PM -1.6 ft | 7:20 AM / 3:54 PM |
| Tue Nov 10 | H 1:19 AM 15.3 ftL 6:46 AM 3.1 ftH 1:06 PM 17.4 ftL 7:23 PM -1.4 ft | 7:22 AM / 3:52 PM |
Heights are in feet above mean lower low water (MLLW), the zero line on most US nautical charts. A minus height means the water drops below that line.
Fish in the waters around Castle Islands, Duncan Canal
34 kinds of fish, sharks and rays have been recorded within 15 km (about 9 miles) of this spot, most often Sturgeon Poacher, Northern Ronquil, Shortfin Eelpout. The bar shows how many records each has.
- Sturgeon Poacher Podothecus accipenserinusSalt water · 5 records
- Northern Ronquil Ronquilus jordaniSalt water · 5 records
- Shortfin Eelpout Lycodes brevipesSalt water · 5 records
- Great Sculpin Myoxocephalus polyacanthocephalusSalt water · 4 records
- Spinyhead Sculpin Dasycottus setigerSalt water · 4 records
- Whitespotted Greenling Hexagrammos stelleriSalt water · 4 records
- Spinycheek Starsnout Bathyagonus infraspinatusSalt water · 3 records
- Marbled Snailfish Liparis dennyiSalt water · 3 records
- Snake Prickleback Lumpenus sagittaSalt water · 3 records
- Ribbed Sculpin Triglops pingeliiSalt water · 2 records
- Gray Starsnout Bathyagonus alascanusSalt water · 2 records
- Smooth Alligatorfish Anoplagonus inermisSalt water · 2 records
- Flathead Sole Hippoglossoides elassodonSalt water · 2 records
- Pacific Viperfish Chauliodus macouniSalt water · 2 records
- Pacific Staghorn Sculpin Leptocottus armatusSalt water · 1 record
- Hookhorn Sculpin Artediellus pacificusSalt water · 1 record
- Northern Sculpin Icelinus borealisSalt water · 1 record
- Silverspotted Sculpin Blepsias cirrhosusSalt water · 1 record
- Bigmouth Sculpin Hemitripterus boliniSalt water · 1 record
- Shortraker Rockfish Sebastes borealisSalt water · 1 record
- Pacific Spiny Lumpsucker Eumicrotremus orbisSalt water · 1 record
- Bigeye Poacher Bathyagonus pentacanthusSalt water · 1 record
- Shiner Perch Cymatogaster aggregataSalt water · 1 record
- Searcher Bathymaster signatusSalt water · 1 record
- Northern Lampfish Stenobrachius leucopsarusSalt water · 1 record
- Longfin Smelt Spirinchus thaleichthysSalt water · 1 record
- Walleye Pollock Gadus chalcogrammusSalt water · 1 record
- Showy Snailfish Liparis pulchellusSalt water · 1 record
- Tubenose Poacher Pallasina barbataSalt water · 1 record
- Wattled Eelpout Lycodes palearisSalt water · 1 record
- Crescent Gunnel Pholis laetaSalt water · 1 record
- Pacific Sandfish Trichodon trichodonSalt water · 1 record
- Dover Sole Microstomus pacificusSalt water · 1 record
- Capelin Mallotus villosusSalt water · 1 record
Records from GBIF datasets released under CC0 or CC BY 4.0 (museum collections, surveys and community sightings). It shows what has been found here, not a complete list. Check your state rules before keeping fish.
About the tides at Castle Islands, Duncan Canal
Castle Islands, Duncan Canal gets two high tides and two low tides almost every day, and the two highs are close in height. Over the next month the water typically rises or falls about 13.2 ft between a high and the next low.
The biggest swings in this window come around Tuesday, October 27, when the day's range reaches 22.3 ft, and again around Sunday, October 11 (19.9 ft). Those spring tides follow the new and full moon by a day or two. The calmest day is Monday, October 19, with only 7.7 ft between the day's highest and lowest water.
The lowest tide of the month is -3.5 ft at 8:29 PM on Tuesday, October 27. There are 16 minus tides (lows below the chart's zero line) in this window: the best times for tide pools, clamming and walking the flats.
The highest predicted tide is 18.9 ft at 2:13 PM on Tuesday, October 27. Onshore wind or a storm can push the real water level above that.
This is a reference (harmonic) station: NOAA predicts its tides directly from years of measured water levels here, which makes it among the most reliable predictions on the coast.
Station details
- NOAA station ID: 9451321
- Type: reference (harmonic)
- Location: 56.6433, -133.1520
Nearby tide stations
- Beecher Pass 7 mi
- Anchor Point 9 mi
- Papke's Landing 9 mi
- Point Lockwood, Woewodski Island 9 mi
- Turn Point 13 mi
- Petersburg 14 mi