Castle Islands, Duncan Canal Tide Chart
Alaska · NOAA Station 9451321 · 56.643°, -133.152°
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This Week’s Tides for Castle Islands, Duncan Canal
High and low tide times and heights (ft, MLLW) for the week ahead.
| Low | 12:44 AM | 2.3 ft |
| High | 7:04 AM | 11.4 ft |
| Low | 12:32 PM | 3.1 ft |
| High | 7:26 PM | 14.0 ft |
| Low | 1:45 AM | 2.7 ft |
| High | 8:13 AM | 10.5 ft |
| Low | 1:19 PM | 4.5 ft |
| High | 8:22 PM | 13.6 ft |
| Low | 3:01 AM | 2.9 ft |
| High | 9:26 AM | 10.1 ft |
| Low | 2:21 PM | 5.6 ft |
| High | 9:21 PM | 13.4 ft |
| Low | 4:21 AM | 2.5 ft |
| High | 10:35 AM | 10.4 ft |
| Low | 3:42 PM | 6.2 ft |
| High | 10:18 PM | 13.7 ft |
| Low | 5:24 AM | 1.8 ft |
| High | 11:35 AM | 11.0 ft |
| Low | 4:57 PM | 6.0 ft |
| High | 11:12 PM | 14.1 ft |
| Low | 6:10 AM | 1.0 ft |
| High | 12:25 PM | 11.9 ft |
| Low | 5:52 PM | 5.4 ft |
| High | 12:01 AM | 14.8 ft |
| Low | 6:47 AM | 0.1 ft |
| High | 1:08 PM | 12.7 ft |
| Low | 6:36 PM | 4.7 ft |
Castle Islands, Duncan Canal Tide Table — Next 30 Days
Every high and low tide for the next month at Castle Islands, Duncan Canal, with heights in feet (MLLW), the daily tidal range, and sunrise & sunset.
| Day | Sunrise | Sunset | Tides (time · ft, MLLW) | Range | |||
|---|---|---|---|---|---|---|---|
| Tue, Jul 21Today | 4:33 AM | 9:24 PM | Low12:44 AM2.3 ft | High7:04 AM11.4 ft | Low12:32 PM3.1 ft | High7:26 PM14.0 ft | 11.7 ft |
| Wed, Jul 22 | 4:35 AM | 9:23 PM | Low1:45 AM2.7 ft | High8:13 AM10.5 ft | Low1:19 PM4.5 ft | High8:22 PM13.6 ft | 10.9 ft |
| Thu, Jul 23 | 4:36 AM | 9:21 PM | Low3:01 AM2.9 ft | High9:26 AM10.1 ft | Low2:21 PM5.6 ft | High9:21 PM13.4 ft | 10.5 ft |
| Fri, Jul 24 | 4:38 AM | 9:19 PM | Low4:21 AM2.5 ft | High10:35 AM10.4 ft | Low3:42 PM6.2 ft | High10:18 PM13.7 ft | 11.2 ft |
| Sat, Jul 25 | 4:40 AM | 9:17 PM | Low5:24 AM1.8 ft | High11:35 AM11.0 ft | Low4:57 PM6.0 ft | High11:12 PM14.1 ft | 12.3 ft |
| Sun, Jul 26 | 4:42 AM | 9:15 PM | Low6:10 AM1.0 ft | High12:25 PM11.9 ft | Low5:52 PM5.4 ft | — | 10.9 ft |
| Mon, Jul 27 | 4:44 AM | 9:14 PM | High12:01 AM14.8 ft | Low6:47 AM0.1 ft | High1:08 PM12.7 ft | Low6:36 PM4.7 ft | 14.7 ft |
| Tue, Jul 28 | 4:46 AM | 9:12 PM | High12:46 AM15.4 ft | Low7:20 AM-0.7 ft | High1:45 PM13.5 ft | Low7:13 PM3.8 ft | 16.1 ft |
| Wed, Jul 29 | 4:47 AM | 9:10 PM | High1:27 AM15.9 ft | Low7:50 AM-1.3 ft | High2:20 PM14.2 ft | Low7:48 PM3.1 ft | 17.2 ft |
| Thu, Jul 30 | 4:49 AM | 9:08 PM | High2:05 AM16.1 ft | Low8:20 AM-1.7 ft | High2:53 PM14.8 ft | Low8:23 PM2.4 ft | 17.8 ft |
| Fri, Jul 31 | 4:51 AM | 9:06 PM | High2:41 AM16.1 ft | Low8:50 AM-1.8 ft | High3:25 PM15.1 ft | Low8:58 PM1.8 ft | 17.9 ft |
| Sat, Aug 1 | 4:53 AM | 9:04 PM | High3:17 AM15.7 ft | Low9:20 AM-1.6 ft | High3:57 PM15.3 ft | Low9:36 PM1.4 ft | 17.3 ft |
| Sun, Aug 2 | 4:55 AM | 9:01 PM | High3:54 AM15.1 ft | Low9:52 AM-1.0 ft | High4:29 PM15.3 ft | Low10:16 PM1.1 ft | 16.3 ft |
| Mon, Aug 3 | 4:57 AM | 8:59 PM | High4:33 AM14.3 ft | Low10:27 AM-0.1 ft | High5:03 PM15.2 ft | Low11:00 PM1.0 ft | 15.3 ft |
| Tue, Aug 4 | 4:59 AM | 8:57 PM | High5:19 AM13.2 ft | Low11:04 AM1.1 ft | High5:41 PM15.0 ft | Low11:49 PM1.1 ft | 13.9 ft |
| Wed, Aug 5 | 5:01 AM | 8:55 PM | High6:14 AM12.0 ft | Low11:46 AM2.4 ft | High6:28 PM14.7 ft | — | 12.3 ft |
| Thu, Aug 6 | 5:03 AM | 8:53 PM | Low12:46 AM1.3 ft | High7:27 AM11.1 ft | Low12:36 PM3.8 ft | High7:30 PM14.4 ft | 13.1 ft |
| Fri, Aug 7 | 5:05 AM | 8:51 PM | Low1:57 AM1.5 ft | High8:52 AM10.7 ft | Low1:41 PM5.0 ft | High8:44 PM14.5 ft | 13.0 ft |
| Sat, Aug 8 | 5:07 AM | 8:48 PM | Low3:24 AM1.2 ft | High10:11 AM11.2 ft | Low3:08 PM5.5 ft | High9:57 PM15.1 ft | 13.9 ft |
| Sun, Aug 9 | 5:09 AM | 8:46 PM | Low4:47 AM0.1 ft | High11:20 AM12.2 ft | Low4:38 PM5.1 ft | High11:03 PM16.0 ft | 15.9 ft |
| Mon, Aug 10 | 5:11 AM | 8:44 PM | Low5:51 AM-1.2 ft | High12:18 PM13.5 ft | Low5:49 PM3.9 ft | — | 14.7 ft |
| Tue, Aug 11 | 5:13 AM | 8:41 PM | High12:03 AM17.0 ft | Low6:43 AM-2.3 ft | High1:07 PM14.8 ft | Low6:45 PM2.5 ft | 19.3 ft |
| Wed, Aug 12 | 5:15 AM | 8:39 PM | High12:58 AM17.8 ft | Low7:27 AM-3.0 ft | High1:51 PM15.9 ft | Low7:33 PM1.2 ft | 20.8 ft |
| Thu, Aug 13 | 5:17 AM | 8:37 PM | High1:47 AM18.1 ft | Low8:07 AM-3.2 ft | High2:31 PM16.7 ft | Low8:18 PM0.2 ft | 21.3 ft |
| Fri, Aug 14 | 5:19 AM | 8:34 PM | High2:33 AM18.0 ft | Low8:44 AM-2.9 ft | High3:09 PM17.1 ft | Low9:01 PM-0.2 ft | 20.9 ft |
| Sat, Aug 15 | 5:21 AM | 8:32 PM | High3:16 AM17.2 ft | Low9:20 AM-2.0 ft | High3:47 PM17.0 ft | Low9:42 PM-0.3 ft | 19.2 ft |
| Sun, Aug 16 | 5:23 AM | 8:29 PM | High3:59 AM16.1 ft | Low9:55 AM-0.8 ft | High4:24 PM16.5 ft | Low10:24 PM0.1 ft | 17.3 ft |
| Mon, Aug 17 | 5:25 AM | 8:27 PM | High4:43 AM14.6 ft | Low10:29 AM0.7 ft | High5:02 PM15.7 ft | Low11:07 PM0.8 ft | 15.0 ft |
| Tue, Aug 18 | 5:27 AM | 8:25 PM | High5:29 AM13.0 ft | Low11:04 AM2.3 ft | High5:42 PM14.8 ft | Low11:52 PM1.8 ft | 13.0 ft |
| Wed, Aug 19 | 5:29 AM | 8:22 PM | High6:22 AM11.5 ft | Low11:40 AM3.9 ft | High6:28 PM13.7 ft | — | 9.8 ft |
About Castle Islands, Duncan Canal tides
Tide predictions for Castle Islands, Duncan Canal come from NOAA station 9451321 (Alaska), computed from long-term harmonic analysis of observed water levels. Heights are shown in feet relative to MLLW (Mean Lower Low Water) — the same datum used on US nautical charts — so they line up directly with charted depths.
Castle Islands, Duncan Canal typically sees a mixed semidiurnal tide, with two highs and two lows of differing heights each day. Use the curve above to time a harbor entrance, a beach walk, fishing a moving tide, or clearing a shallow bar — and remember that wind and pressure can push the real water level above or below prediction. The daily tidal range in the 30-day table shows how much water moves each day: bigger ranges around the new and full moon mean stronger currents.
Frequently asked
What time is high tide in Castle Islands, Duncan Canal today?+
Today (Tuesday, July 21), high tide at Castle Islands, Duncan Canal is at 7:04 AM (11.4 ft), 7:26 PM (14.0 ft). Heights are referenced to MLLW (Mean Lower Low Water).
What time is low tide in Castle Islands, Duncan Canal today?+
Today, low tide at Castle Islands, Duncan Canal is at 12:44 AM (2.3 ft), 12:32 PM (3.1 ft).
What tidal datum do these Castle Islands, Duncan Canal tide heights use?+
All heights are given in feet relative to MLLW (Mean Lower Low Water), the standard NOAA chart datum for US tidal waters. A tide of 0.0 ft equals the chart datum; negative tides fall below it.
How accurate are these tide predictions?+
These are NOAA harmonic predictions — highly accurate for the astronomical tide. Real water levels can still differ with wind, barometric pressure, and storms, so always check current conditions before getting underway.
Never mistime a tide again.
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