Tides Today & Tomorrow in Prisoners Point, San Joaquin River, CA

The lowest tide this week in Prisoners Point, San Joaquin River, CA is -0.3 ft on Wednesday, Jul 15 at 1:46 pm.

The highest tide this week in Prisoners Point, San Joaquin River, CA is 4.5 ft on Tuesday, Jul 14 at 4:41 am — worth noting for launching your boat and being alert for possible high tide flooding.

Slack tide in Prisoners Point, San Joaquin River, CA is approximately 8:44 pm — midway between the next high and low tide, when tidal current is weakest. This is the preferred window for boat crossings, underwater visibility, and fishing in areas with strong currents.

Prisoners Point, San Joaquin River, CA is currently in a spring phase. Tonight's moon is 1% illuminated. Spring tides (largest swings) occur near new and full moons; neap tides (smallest swings) occur near first and third quarter moons. Tidal ranges this week are near their weekly maximum.

Tide heights on this page are measured from Mean Lower Low Water (MLLW), the U.S. NOAA standard. A height of 0 ft represents the 19-year average of each day's lower low tide. Negative values indicate a "minus tide" — water levels below that long-term reference.

Tide predictions for Prisoners Point, San Joaquin River, CA come from NOAA's harmonic analysis and are typically accurate within about ±10 minutes on timing and ±0.5 ft on height. Actual water levels can deviate further due to sustained winds, atmospheric pressure changes, river flow, and storm surge. During major weather events, be sure to check US Harbors weather pages for factors that could impact tidal predictions.

Tide data for Prisoners Point, San Joaquin River, CA is sourced from NOAA Station #9415149. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=9415149.

High tides in Prisoners Point, San Joaquin River, CA today: 3:44 am (4.5 ft), 6:27 pm (3.0 ft). The 3:44 am high of 4.5 ft is notably higher than the other — known as diurnal inequality, common on coasts influenced by lunar declination.

Low tides in Prisoners Point, San Joaquin River, CA today: 12:15 pm (-0.2 ft), 11:02 pm (1.7 ft). The 12:15 pm low of -0.2 ft is a minus tide — water below the MLLW reference datum, which can expose tidepools, mudflats, and shellfish beds not normally accessible.

Today's tidal range in Prisoners Point, San Joaquin River, CA is 4.7 ft — the difference between the day's highest and lowest water level. This month's average daily range is about 3.6 ft, so today's swing is above-average.

Tonight the moon over Prisoners Point, San Joaquin River, CA is New Moon (1% illuminated). This places Prisoners Point, San Joaquin River, CA in a spring tide cycle, so tidal ranges are near their weekly maximum this week.

Prisoners Point, San Joaquin River, CA has semi-diurnal tides — two high tides and two low tides roughly every 24 hours and 50 minutes, with similar heights.