U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9415379 PUBLICATION DATE: 01/06/2004
Name: JOICE ISLAND, SUISUN SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 10.8' N ( 38.18000)
USGS Quad: FAIRFIELD SOUTH Longitude: 122° 2.7' W (-122.04500)
To reach the tidal bench marks from Benicia, proceed by boat NE in Suisun Bay
along the eastern shore of Morrow Island, then head west an proceed north on
Suisun Slough to the eighth bend in the slough, near the entrance to Volanti
Slough. The bench marks are along the levee road on the west bank of Joice
Island along Suisun Slough, and north to the junction of Suisun and Volanti
Sloughs. The tide gage and staff were on the NW end of the Bureau of
Reclamation pier extending into Suisun Slough from Joice Island, just south of
the entrance to Volanti Slough.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5379 A 1977
DESIGNATION: 941 5379 A
MONUMENTATION: Tidal Station disk VM#: 8657
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 10.8' N ( 38.18000) LONGITUDE: 122° 2.7' W (-122.04500)
The primary bench mark is a disk located on the shore near the pier which had
the tide station on it, 5.00 m (16.4 ft) ESE of the end of the Bureau of
Reclamation pier, and 3.51 m (11.5 ft) WSW of the centerline of a dirt road.
The bench mark is crimped to a copper-clad steel rod driven 19.5 m (64 ft), and
encased in a PVC pipe extending 0.15 m (0.5 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9415379 PUBLICATION DATE: 01/06/2004
Name: JOICE ISLAND, SUISUN SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 10.8' N ( 38.18000)
USGS Quad: FAIRFIELD SOUTH Longitude: 122° 2.7' W (-122.04500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5379 D 1977
DESIGNATION: 941 5379 D
MONUMENTATION: Tidal Station disk VM#: 8660
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 10.8' N ( 38.18000) LONGITUDE: 122° 2.7' W (-122.04500)
The bench mark is a disk located 102 m (335 ft) WSW of bench mark 5379 A 1977,
and 2.99 m (9.8 ft) SSE of the centerline of a dirt road. The bench mark is
crimped to a copper-clad steel rod driven 16.8 m (55 ft), and encased in a PVC
pipe extending 0.09 m (0.3 ft) above grade.
BENCH MARK STAMPING: 5379 F 1988
DESIGNATION: 941 5379 F
MONUMENTATION: Tidal Station disk VM#: 11268
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 38° 10.8' N ( 38.18000) LONGITUDE: 122° 2.7' W (-122.04500)
The bench mark is a disk set in a concrete monument on the west shore of Joice
Island, 107 m (351 ft) south of bench mark 5379 D 1977, 4 m (13 ft) WSW of the
center of a T in the road, 0.88 m (2.9 ft) WSW of a road sign, and 0.79 m (2.6
ft) north of a 1 m (4 ft) high steel stake.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9415379 PUBLICATION DATE: 01/06/2004
Name: JOICE ISLAND, SUISUN SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 10.8' N ( 38.18000)
USGS Quad: FAIRFIELD SOUTH Longitude: 122° 2.7' W (-122.04500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5379 G 1988
DESIGNATION: 941 5379 G
MONUMENTATION: Tidal Station disk VM#: 11269
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 38° 10.8' N ( 38.18000) LONGITUDE: 122° 2.7' W (-122.04500)
The bench mark is a disk set in a concrete monument near the entrance to Volanti
Slough, 100 m (328 ft) NNW of bench mark 5379 A 1977, 3.11 m (10.2 ft) WSW of
the centerline of the road, and 1.19 m (3.9 ft) south of a telephone pole.
BENCH MARK STAMPING: S-42
DESIGNATION: 941 5379 S-42
MONUMENTATION: Survey disk VM#: 11270
AGENCY: California Water Resources (CWR) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 38° 10.8' N ( 38.18000) LONGITUDE: 122° 2.7' W (-122.04500)
The bench mark is a disk located near the west shore of Joice Island, 53 m (174
ft) ENE of bench mark 5379 F 1988, and 2.99 m (9.8 ft) north of the centerline
of the road. The bench mark is crimped to an unspecified rod driven to an
unspecified depth, and encased in a 6-inch PVC pipe extending 0.15 m (0.5 ft)
above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9415379 PUBLICATION DATE: 01/06/2004
Name: JOICE ISLAND, SUISUN SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 10.8' N ( 38.18000)
USGS Quad: FAIRFIELD SOUTH Longitude: 122° 2.7' W (-122.04500)
T I D A L D A T U M S
Tidal datums at JOICE ISLAND, SUISUN SLOUGH based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: November 1977 - October 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9415144 PORT CHICAGO, SUISUN BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (02/05/1978) = 2.043
MEAN HIGHER HIGH WATER MHHW = 1.587
MEAN HIGH WATER MHW = 1.436
MEAN TIDE LEVEL MTL = 0.831
MEAN SEA LEVEL MSL = 0.831
MEAN LOW WATER MLW = 0.225
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (05/27/1978) = -0.331
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5379 A 1977 1.879 0.443
5379 D 1977 1.731 0.295
5379 F 1988 2.039 0.603
5379 G 1988 2.102 0.666
S-42 0.983 -0.453
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9415379 PUBLICATION DATE: 01/06/2004
Name: JOICE ISLAND, SUISUN SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 10.8' N ( 38.18000)
USGS Quad: FAIRFIELD SOUTH Longitude: 122° 2.7' W (-122.04500)
D E F I N I T I O N S
Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch. It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).
NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929. Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.
The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.
The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum. As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.