2022 Tide Tables

1 Created: 11/24/2021 2022 Tide Tables PREFACE: These Tables depict the predicted times and heights of the high and low waters for each day of the year for the following locations: Publication Volume 1: Near I Street on the Sacramento River in Sacramento, Port of west Sacramento, and Rio Vista. Publication Volume 2: Antioch, Venice Island, and Port of Stockton. These stations are known as subordinate stations. Subordinate stations in this publication use NOAA's National Ocean Service (NOS) tide prediction for the San Francisco tide gage at Golden Gate as the reference station. Tides are computed from a regression correlating Golden Gate tides with the subordinate station. Standard tide constants are not used. Times of high and low tide are set to Pacific Standard Time. The publications above and corresponding comma-separated value (CSV) data files can be found online at the following address: #tides Tides on the west coast of North America typically occur in a modified semi-diurnal pattern called a mixed tide.

2 This is where there are two high and two low tides a day but the heights of the two successive highs are not the same, similarly for the two successive lows. The time and cyclical regularity of the tides can be explained primarily by the harmonic effect of the moon and the sun on the earth. Other factors such as the topography of the channel also come into play. Experience has shown that the heights of both high and low tides could be higher than predicted due to unusually strong onshore winds, a low barometric pressure and high river runoff. Conversely, the opposite could be true for strong offshore winds, a rising barometer and unusually-low river levels. Forecasts for I Street are based on an assumed average flow of 15,000 cfs in the mainstem Sacramento River. This incorporates the normal dry season releases from Keswick, Oroville and Nimbus reservoirs.

3 Meteorological and reservoir release conditions change constantly and continually affect tidal stages in the Delta. I Street, Rio Vista, Antioch and Venice Island tide forecasts are updated daily in river forecast bulletins (text products) to account for these effects. These river bulletins are jointly issued by the California-Nevada River Forecast Center and the California Department of Water Resources, and can be accessed from the following web page: #bulletins I Street: Lower Sacramento River forecast bulletin Rio Vista, Venice Island, Antioch: Delta Tide forecast bulletin The gage data can be accessed from the California Data Exchange Center web site: Station Latitude Longitude Datum (as of Oct 3, 2016) CDEC ID I Street Bridge NAVD88 IST Rio Vista NAVD88 RVB Port of west Sacramento No gage -- -- Antioch NAVD88 ANH Venice Island NAVD88 VNI Port of Stockton No gage -- -- Golden Gate MLLW* + ft NAVD88 -- *MLLW: Mean Lower Low Water.

4 A tidal datum. The average of the lower low water height of each tidal day observed over the National Tidal Datum Epoch. REVISIONS TO THE TIDE TABLE PUBLICATION On October 1, 2006 the California State Department of Water Resources (CADWR) changed the reporting of all tide data collected in the Delta and Suisun Marsh from the National Geodetic Vertical Datum 1929 (NGVD29) and the United States Engineering Datum (USED) to the North American Vertical Datum 1988 (NAVD88) standard. The NAVD88 datum has been adopted by all of the major data collection agencies that operate in the Delta and is the accepted standard in the surveying community. Vertical datums are normally updated to account for geological changes to the earth s surface. These changes could be the result of uplift, subsidence, or changes in sea level. Unfortunately, NGVD29 and USED are composed of many different references to mean sea level (MSL) making it impossible to establish a standard MSL elevation for all points in the United States.

5 NAVD88 uses one base monument located at Father s Point, Quebec Canada as MSL. All other benchmarks in North America are referenced to that one base monument for NAVD88 elevations. In 2002, CADWR with the assistance of the National Geodetic Survey conducted a Global Positioning System survey of the Delta and Suisun Marsh to establish NAVD88 based elevations at over 100 benchmarks in the area. The subsequent field and office work to process the data was completed in late 2004. Station conversion was completed at all of the Delta and Suisun Marsh stations in summer 2005. The change affected the stages reported on the California Data Exchange Center (CDEC) web site ( ). Prior to October 1, 2006, CDEC was reporting tide data as NGVD29 or USED. As of October 1, 2006, the web site reported the data as NAVD88. These publications report tidal information adjusted to the NAVD88 standard for Rio Vista, Venice Island, Antioch, and recently, as of October 3, 2016, Sacramento River at I Street Bridge as well (information on the October 2016 datum change can be found here: ).

6 The Port of west Sacramento and Port of Stockton Tables will remain at NGVD29 since there is no current gaging at these locations. In addition, references to the Port of Sacramento were changed to Port of west Sacramento for the 2021 publication. Only the name was changed; the data references the same location. Changes on October 1, 2006: Antioch NAVD88 stage ft = previous NGVD29 stage Venice Island NAVD88 stage + ft = previous USED stage Rio Vista NAVD88 stage + ft = previous USED stage Change on October 3, 2016: I Street Bridge NAVD88 stage ft = previous NGVD29 stage The California Nevada River Forecast Center and the California Department of Water Resources are working with NOAA s National Ocean Service to improve tide predictions for the San Francisco Bay and Sacramento/San Joaquin Delta region. As part of this effort, we need to better understand how the information is this publication is being used.

7 To assist us in this process, please contact us by email at or by phone at 916-979-3056. Thank you. TIDE FORECASTS FOR MONTH OF JAN 2022 CALIFORNIA-NEVADA RIVER FORECAST CENTER NATIONAL WEATHER SERVICE ALL FORECASTS ARE IN PACIFIC STANDARD TIME GOLDEN GATE RIO VISTA PORT OF SACTO I ST BRIDGE DAY TIME STAGE DAY TIME STAGE DAY TIME STAGE DAY TIME STAGE 1 306 1 753 1 839 1 1133 1 927 1 1357 1 1518 1 1719 1 1627 1 2226 1 2354 2 347 1 2351 2 442 2 502 2 836 2 404 2 857 2 940 2 1229 2 1017 2 1448 2 1612 2 1802 2 1716 2 2319 3 49 3 428 3 40 3 534 3 555 3

8 917 3 459 3 954 3 1036 3 1325 3 1107 3 1538 3 1704 3 1848 3 1804 4 7 4 138 4 508 4 127 4 622 4 643 4 1002 4 554 4 1053 4 1134 4 1427 4 1159 4 1628 4 1756 4 1934 4 1851 5 46 5 215 5 545 5 212 5 704 5 729 5 1047 5 653 5 1153 5 1237 5 1535 5 1251 5 1718 5 1843 5 2028 5 1938 6 124 6 250 6 622 6 258 6 748 6 816 6 1132 6 756 6 1256 6 1344 6 1650 6 1346 6 1809 6 1933 6 2123 6 2025 7 158 7 320 7 654 7 343 7 827 7 902 7 1213 7 905 7 1405 7 1457 7 1822 7 1446 7 1906 7 2024 7 2231 7 2113 8 229 8 346 8 725 8 427 8 906 8 947 8 1258 8 1019 8 1522 8 1619 8 2003 8 1555 8 2013 8 2123 8 2350 8 2202 9 302 9 413 9 756 9 510 9 943 9 1032 9 1337 9 1133 9 1639 9 1743 9 2146 9 1718 9 2136 9 2236 10 128 9 2253 10 341 10 445 10 831

9 10 552 10 1020 10 1116 10 1415 10 1241 10 1752 10 1901 10 2320 10 1854 10 2315 11 4 11 320 10 2347 11 427 11 526 11 906 11 633 11 1057 11 1201 11 1449 11 1339 11 1857 11 2011 12 36 11 2024 12 50 12 130 12 501 TIDE FORECASTS FOR MONTH OF JAN 2022 CALIFORNIA-NEVADA RIVER FORECAST CENTER NATIONAL WEATHER SERVICE ALL FORECASTS ARE IN PACIFIC STANDARD TIME GOLDEN GATE RIO VISTA PORT OF SACTO I ST BRIDGE DAY TIME STAGE DAY TIME STAGE DAY TIME STAGE DAY TIME STAGE 12 44 12 521 12 618 12 948 12 714 12 1137 12 1246 12 1521 12 1429 12 1954 12 2113 13 134 12 2134 13 206 13 239 13 614 13 140 13 617 13 712 13 1034 13 753 13 1215 13 1329 13 1549 13 1512 13 2043 13 2204 14 225 13 2228 14 305 14 334 14 708 14 231 14 710 14 802 14 1124 14 833 14 1255 14 1411 14 1628 14 1550 14 2125 14 2250 15 259 14 2312 15 353 15 420 15 750 15 318 15 801 15 851 15 1215 15 912 15 1335 15 1452 15 1705 15 1625 15 2203

10 15 2329 16 334 15 2349 16 432 16 459 16 827 16 359 16 844 16 935 16 1247 16 950 16 1415 16 1533 16 1738 16 1658 16 2240 17 7 17 404 17 22 17 507 17 534 17 853 17 437 17 925 17 1012 17 1332 17 1028 17 1452 17 1611 17 1816 17 1730 17 2311 18 37 18 435 18 53 18 538 18 605 18 928 18 514 18 1002 18 1051 18 1404 18 1106 18 1530 18 1650 18 1853 18 1802 18 2344 19 110 19 503 19 123 19 608 19 636 19 955 19 550 19 1039 19 1127 19 1446 19 1144 19 1607 19 1727 19 1931 19 1834 20 12 20 138 20 530 20 153 20 637 20 706 20 1027 20 630 20 1121 20 1210 20 1531 20 1223 20 1646 20 1805 20 2010 20 1907 21 40 21 204 21 555 21 224 21 707 21 738 21 1057 21 715 21 1209 21 1259 21 1629 21 1305 21 1726 21 1843 21 2053 21 1942 22 106 22 226 22 618 22 256 22 735 22 811 22 1129 22 807 22 1302 22 1355 22 1734 22 1354 22 1813 22 1926