Custom House Cove, Mary Island Tides Today
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Custom House Cove, Mary Island runs a mean tidal range of about 12.3 ft. This month the highest water, 18.7 ft, comes on the afternoon of Nov 25, and the lowest, a -3.1 ft minus tide, on the evening of Nov 25.
| Low tide | 1:14 AM | 1.7 ft |
| High tide | 8:00 AM | 13.4 ft |
| Low tide | 2:00 PM | 4.4 ft |
| High tide | 8:03 PM | 13.0 ft |
Today on the water at Custom House Cove, Mary Island
Today at Custom House Cove, Mary Island: high tide at 8:00 AM (13.4 ft) and 8:03 PM (13.0 ft), low tide at 1:14 AM (1.7 ft) and 2:00 PM (4.4 ft). The National Weather Service forecast for Tuesday is mostly cloudy then chance light rain with SE winds 10 to 15 mph, 50°F. Wind that strong can hold water in or push it out, so the real tide may run above or below these predictions. In effect now: Small Craft Advisory. Sunrise is at 6:51 AM and sunset at 4:05 PM.
| Period | Forecast | Wind | Temp |
|---|---|---|---|
| Overnight | Mostly Cloudy | SE 5 mph | 41°F |
| Tuesday | Mostly Cloudy then Chance Light Rain | SE 10 to 15 mph | 50°F |
Forecast: National Weather Service point forecast for this location.
Where Custom House Cove, Mary Island is
Custom House Cove, Mary Island sits at 55.1000° N, 131.2170° W on Southeast Alaska's Inside Passage, about 12 mi east of Metlakatla, AK. The station here is a historical NOAA reference station: a gauge measured the tide at this spot from 2010 until 2010, and NOAA still publishes harmonic predictions from that record. There is no live reading here today. The closest gauge measuring live water level is Ketchikan (NOAA 9450460), 22.7 mi away, and high and low water here run on average about 3 min earlier than there. The nearest weather station is Mary Island, AK, a shore station reporting wind and, at most sites, water temperature, 1.4 mi away.
The tide at Custom House Cove, Mary Island
Custom House Cove, Mary Island has a semidiurnal tide: two highs and two lows a day of about the same size, roughly 12 hours 25 minutes apart. This month's predictions average 1.9 high tides a day here. The mean range from lower low to higher high is 15.2 ft, and 12.8 ft between the average high and the average low, a very large tide, among the biggest in the United States. On an average day the higher high tops the lower high by 0.9 ft and the lower low sits 1.6 ft below the other low. For the water around it: Inside Passage tides are large and mixed semidiurnal, two highs and two lows a day with ranges of 12 to 20 ft that drive fast currents in the narrows.
About this station
- High tide reaches Custom House Cove, Mary Island about 9.4 hours after the moon passes overhead. That lag is local, which is why high water does not line up with the moon.
Datum and source
Heights on this page are feet above mean lower low water (MLLW), the zero NOAA's nautical charts use for soundings. A predicted 0.0 ft low is the average of the lower low each day; a minus tide is water below chart datum, and a 2 ft high means 2 ft more water than the chart shows. NOAA fixes MLLW at Custom House Cove, Mary Island from the 1983-2001 National Tidal Datum Epoch; mean higher high water is 15.2 ft above it and mean sea level 8.0 ft. These datums are controlled from NOAA's Ketchikan, AK gauge. Source: NOAA CO-OPS station 9450296, established 2010, gauge removed 2010. The tide times and heights are NOAA's official harmonic predictions for this station; TidalMap republishes them daily and does not alter them.
Tide stations near Custom House Cove, Mary Island
- Boca de Quadra: 16.6 mi, tides about 4 min later
- Ketchikan: 22.7 mi, tides about 3 min later
- Nakat Harbor, Alaska: 28.2 mi, tides about 8 min later
- Ward Cove: 28.8 mi, tides at about the same time
- Menefee Anch., Prince of Wales Island: 31.9 mi, tides at about the same time
TidalMapMonthly tide calendar
🌊 Biggest flood tides at Custom House Cove, Mary Island this month: Nov 7, Nov 8, Nov 9, Nov 22, Nov 23, Nov 24, Nov 25, Nov 26, Nov 27. These spring highs push water up into the grass and over the oyster rock; prime for poling into flooded marsh for tailing reds.
🔻 Negative (minus) low tides at Custom House Cove, Mary Island this month: Nov 6, Nov 7, Nov 8, Nov 9, Nov 10, Nov 11, Nov 22, Nov 23, Nov 24, Nov 25, Nov 26, Nov 27 …. These drain the flats and expose the oyster rock, prime for sight-fishing and clamming.
Best fishing times (solunar)
Major and minor solunar windows for Custom House Cove, Mary Island, peak feeding activity is around the moon overhead/underfoot (majors) and moonrise/moonset (minors). Score is the day's activity coefficient (0–100).
| Day | Major windows | Minor windows | Score |
|---|---|---|---|
| Today 🌗 | 6:18–8:18 AM 6:43–8:43 PM | — 1:18–3:18 PM | 50 |
| Wed Nov 4 🌗 | 7:06–9:06 AM 7:31–9:31 PM | 12:24–2:24 AM 1:27–3:27 PM | 63 |
| Thu Nov 5 🌘 | 7:51–9:51 AM 8:16–10:16 PM | 1:50–3:50 AM 1:34–3:34 PM | 75 |
| Fri Nov 6 🌘 | 8:36–10:36 AM 9:01–11:01 PM | 3:15–5:15 AM 1:42–3:42 PM | 85 |
| Sat Nov 7 🌘 | 9:22–11:22 AM 9:47–11:47 PM | 4:38–6:38 AM 1:51–3:51 PM | 93 |
| Sun Nov 8 🌘 | 10:08–12:08 PM 10:33–12:33 AM | 6:01–8:01 AM 2:03–4:03 PM | 97 |
| Mon Nov 9 🌑 | 10:56–12:56 PM 11:21–1:21 AM | 7:23–9:23 AM 2:20–4:20 PM | 99 |
Predictions & observations: NOAA CO-OPS station 9450296. Solunar windows computed from the moon's position for this location. Times shown in the station's local time. Not for navigation.
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