U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9415498 PUBLICATION DATE: 01/06/2004
Name: SUISUN CITY, SUISUN SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 14.2' N ( 38.23670)
USGS Quad: FAIRFIELD SOUTH Longitude: 122° 1.8' W (-122.03000)
To reach the tidal bench marks from Suisin city, proceed south along Marina
Boulevard to the Suisun-Pacific Marina on the Suisun Slough.The bench marks are
located on the marina property. The tide gage and staff were located on the
seawall at the marina along Suisun Slough.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5498 B 1977
DESIGNATION: 941 5498 B
MONUMENTATION: Tidal Station disk VM#: 8691
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 14.2' N ( 38.23670) LONGITUDE: 122° 1.8' W (-122.03000)
The primary bench mark is a disk located along Suisun Slough, 16 m (53 ft) SSW
from the third light pole in a row extending SSW of the harbor master office,
4.72 m (15.5 ft) WNW of the gate leading to floating deck A, 3.35 m (11.0 ft) SE
of a concrete high voltage utility box cover level with the ground, and 1.16 m
(3.8 ft) west of marina fire hydrant No. 500. The bench mark is set 0.03 m (0.1
ft) below grade, crimped to the top of a copper-clad steel rod driven 18.3 m (60
ft) to refusal, inside a PVC pipe, and 0.12 m (0.4 ft) below the top of the PVC
pipe. NOTE: The mark is disturbed, with the face of the mark bent up on one
edge, protruding 6 inches above grade and 3 inches above PVC collar, but was not
removed and still considered useful.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9415498 PUBLICATION DATE: 01/06/2004
Name: SUISUN CITY, SUISUN SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 14.2' N ( 38.23670)
USGS Quad: FAIRFIELD SOUTH Longitude: 122° 1.8' W (-122.03000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5498 E 1977
DESIGNATION: 941 5498 E
MONUMENTATION: Tidal Station disk VM#: 8695
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 14.2' N ( 38.23670) LONGITUDE: 122° 1.8' W (-122.03000)
The bench mark is a disk located near the intersection of Marina Circle and
Marina Drive, 19.05 m (62.5 ft) NE from fire hydrant No. 72 in the
Suisun-Pacific subdivision at the intersection, 15 m (50 ft) ENE from the center
of the intersection, 6.34 m (20.8 ft) SSW from the power pole at the east corner
of Marina Circle and Marina Drive, 0.95 m (3.1 ft) SE from the Marina Circle
road sign at the entrance to the marina, and 0.03 m (0.1 ft) above the grade.
The bench mark is 0.03 m (0.1 ft) above the grade, crimped to a copper-clad
steel rod driven 20.1 m (66 ft) to refusal, inside a PVC pipe and 0.18 m (0.6
ft) below the top of the pipe.
BENCH MARK STAMPING: 5498 F 1989
DESIGNATION: 941 5498 F
MONUMENTATION: Tidal Station disk VM#: 17108
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified OPUS PID:
LATITUDE: 38° 14.2' N ( 38.23670) LONGITUDE: 122° 1.8' W (-122.03000)
The bench mark is a disk located 50.12 m (164.6 ft) NE from bench mark 5498 G
1989, 30.3 m (98.6 ft) SSE from the the center of 3 storage buildings located NE
of the marina office, and 27.6 m (90.6 ft) SSE from the SE corner of the
southern most of 3 storage buildings.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9415498 PUBLICATION DATE: 01/06/2004
Name: SUISUN CITY, SUISUN SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 14.2' N ( 38.23670)
USGS Quad: FAIRFIELD SOUTH Longitude: 122° 1.8' W (-122.03000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5498 H 1989
DESIGNATION: 941 5498 H
MONUMENTATION: Tidal Station disk VM#: 17109
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified OPUS PID:
LATITUDE: 38° 14.2' N ( 38.23670) LONGITUDE: 122° 1.8' W (-122.03000)
The bench mark is a disk located 12 m (39 ft) north of flagpole, 9.3 m (30.6 ft)
NE from the NE corner of old marine office, 1.5 m (4.92 ft) SE of the light
pole, 0.8 m (2.6 ft) north of the northern edge of the concrete walkway leading
from NE corner of marina office to the dock boardwalk, and 0.06 m (0.2 ft) below
grade.
BENCH MARK STAMPING: 5498 G 1989
DESIGNATION: 941 5498 G
MONUMENTATION: Tidal Station disk VM#: 17110
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified OPUS PID:
LATITUDE: 38° 14.2' N ( 38.23670) LONGITUDE: 122° 1.8' W (-122.03000)
The bench mark is disk located 60.21 m (197.5 ft) NNE from a row of power/light
poles at the NE corner of the marine office, 50.12 m (164.6 ft) SW from the
bench mark 5498 F 1989, 14 m (46 ft) ENE from the SE corner of a chain link
fance surrounding a power transformer, and 4.05 m (13.3 ft) from the forth
power/light pole in the row.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9415498 PUBLICATION DATE: 01/06/2004
Name: SUISUN CITY, SUISUN SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 14.2' N ( 38.23670)
USGS Quad: FAIRFIELD SOUTH Longitude: 122° 1.8' W (-122.03000)
T I D A L D A T U M S
Tidal datums at SUISUN CITY, SUISUN SLOUGH based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: July 1977 - June 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 (01/16/1978) = 2.094
MEAN HIGHER HIGH WATER MHHW = 1.645
MEAN HIGH WATER MHW = 1.496
MEAN SEA LEVEL MSL = 0.867
MEAN TIDE LEVEL MTL = 0.860
MEAN LOW WATER MLW = 0.224
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (05/05/1978) = -0.353
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5498 B 1977 2.372 0.876
5498 E 1977 1.241 -0.255
5498 F 1989 2.196 0.700
5498 H 1989 2.226 0.730
5498 G 1989 2.261 0.765
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9415498 PUBLICATION DATE: 01/06/2004
Name: SUISUN CITY, SUISUN SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 14.2' N ( 38.23670)
USGS Quad: FAIRFIELD SOUTH Longitude: 122° 1.8' W (-122.03000)
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.