Knappa, Knappa Slough Tides Today
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Knappa, Knappa Slough runs a mean tidal range of about 6.5 ft. This month the highest water, 10.1 ft, comes on the afternoon of Nov 25, and the lowest, a -1.3 ft minus tide, on the evening of Nov 25.
| Low tide | 3:10 AM | 0.4 ft |
| High tide | 9:15 AM | 7.4 ft |
| Low tide | 3:42 PM | 2.1 ft |
| High tide | 9:01 PM | 6.9 ft |
Today on the water at Knappa, Knappa Slough
Today at Knappa, Knappa Slough: high tide at 9:15 AM (7.4 ft) and 9:01 PM (6.9 ft), low tide at 3:10 AM (0.4 ft) and 3:42 PM (2.1 ft). The National Weather Service forecast for Tuesday is partly sunny with NW winds 0 to 7 mph, 61°F. Sunrise is at 6:56 AM and sunset at 4:59 PM.
| Period | Forecast | Wind | Temp |
|---|---|---|---|
| Overnight | Cloudy | E 8 mph | 47°F |
| Tuesday | Partly Sunny | NW 0 to 7 mph | 61°F |
Forecast: National Weather Service point forecast for this location.
Where Knappa, Knappa Slough is
Knappa, Knappa Slough sits at 46.1867° N, 123.5880° W on the Columbia River, at Knappa, OR, in Clatsop County. The station here is a subordinate tide prediction point. NOAA has no gauge in the water at this spot; its times and heights are published as offsets from a reference gauge, named below. The closest gauge measuring live water level is Skamokawa (NOAA 9440569), 8.5 mi away, and high and low water here run on average about 17 min earlier than there. The nearest weather station is Astoria, OR, a shore station reporting wind and, at most sites, water temperature, 8.7 mi away.
The tide at Knappa, Knappa Slough
Knappa, Knappa Slough 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 8.3 ft, and 6.7 ft between the average high and the average low, a large tide. On an average day the higher high tops the lower high by 0.7 ft and the lower low sits 1.0 ft below the other low. For the water around it: The ocean tide runs far up the Columbia, mixed semidiurnal at about 8 ft near the mouth and shrinking to 2 ft or less at Vancouver, where spring runoff moves the river as much as the moon does.
About this station
- High tide reaches Knappa, Knappa Slough about 9.6 hours after the moon passes overhead. That lag is local, which is why high water does not line up with the moon.
- NOAA predicts tides here from Astoria (Tongue Point), Oreg., station 9439040. High tide comes about 29 min later and low tide about 58 min later than there.
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 Knappa, Knappa Slough from the 1983-2001 National Tidal Datum Epoch; mean higher high water is 8.3 ft above it and mean sea level 4.4 ft. These datums are controlled from NOAA's Astoria, OR gauge. Source: NOAA CO-OPS station 9439069, established 1935, gauge removed 1981. The tide times and heights are published as time and height offsets from its reference gauge; TidalMap republishes them daily and does not alter them.
Tide stations near Knappa, Knappa Slough
- Astoria (Tongue Point), Oreg.: 8.7 mi, tides about 44 min earlier
- Wauna: 8.9 mi, tides about 39 min later
- Cathcart Landing, Youngs River: 11.2 mi, tides about 49 min earlier
- Astoria (Youngs Bay), Oreg.: 12.2 mi, tides about 57 min earlier
- Astoria (Port Docks), Oreg.: 13.0 mi, tides about 49 min earlier
TidalMapMonthly tide calendar
🌊 Biggest flood tides at Knappa, Knappa Slough this month: Nov 22, Nov 23, Nov 24, Nov 25, Nov 26, Nov 27, Nov 28. 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 Knappa, Knappa Slough this month: Nov 1, Nov 6, Nov 7, Nov 8, Nov 9, Nov 10, Nov 11, Nov 12, Nov 22, Nov 23, Nov 24, Nov 25 …. 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 Knappa, Knappa Slough, 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 🌗 | 6:47–8:47 AM 7:12–9:12 PM | 11:42–1:42 AM 1:34–3:34 PM | 49 |
| Wed Nov 4 🌗 | 7:34–9:34 AM 7:59–9:59 PM | 1:00–3:00 AM 1:53–3:53 PM | 62 |
| Thu Nov 5 🌘 | 8:20–10:20 AM 8:45–10:45 PM | 2:15–4:15 AM 2:11–4:11 PM | 74 |
| Fri Nov 6 🌘 | 9:05–11:05 AM 9:30–11:30 PM | 3:29–5:29 AM 2:29–4:29 PM | 84 |
| Sat Nov 7 🌘 | 9:50–11:50 AM 10:15–12:15 AM | 4:41–6:41 AM 2:49–4:49 PM | 92 |
| Sun Nov 8 🌘 | 10:36–12:36 PM 11:01–1:01 AM | 5:52–7:52 AM 3:12–5:12 PM | 97 |
| Mon Nov 9 🌑 | 11:24–1:24 PM 11:49–1:49 AM | 7:03–9:03 AM 3:40–5:40 PM | 99 |
Predictions & observations: NOAA CO-OPS station 9439069. 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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