U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9415307 PUBLICATION DATE: 03/09/2004
Name: MEINS LANDING, MONTEZUMA SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 8.2' N ( 38.13670)
USGS Quad: DENVERTON Longitude: 121° 54.4' W (-121.90700)
To reach the tidal bench marks from the Montezuma Union Elementary School at
Birds Landing, proceed 0.3 km (0.2 mi) NE along Collinsville Road, then turn
left and proceed 3.9 km (2.4 mi) west along Birds Landing Road. The bench marks
are located along Birds Landing Road, east of houses and a barn. The tide gage
and staff were located on the end of the dock at Wards Landing.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5307 D 1977
DESIGNATION: 941 5307 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 8649
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 8.2' N ( 38.13670) LONGITUDE: 121° 54.4' W (-121.90700)
The primary bench mark is a disk located on the north side of the road across
from a row of cottages, 182.88 m (600.0 ft) south of the end of Meins Landing
Road, 59.44 m (195.0 ft) ESE from the SE corner of the barn, 24.08 m (79.0 ft)
ENE from the front door of the gabled house, 12.50 m (41.0 ft) ENE from the
centerline of Meins Landing Road, 0.76 m (2.5 ft) NNW from telephone pole along
the side lane on the south side of Meins Landing Road and 9 cm (0.3 ft) below
grade. The bench mark is crimped to the top of a copper-clad steel rod driven
16.2 m (53.0 ft) to refusal and encased in a PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9415307 PUBLICATION DATE: 03/09/2004
Name: MEINS LANDING, MONTEZUMA SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 8.2' N ( 38.13670)
USGS Quad: DENVERTON Longitude: 121° 54.4' W (-121.90700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1949
DESIGNATION: TIDAL 4 BIRDS LANDING
MONUMENTATION: Tidal Station disk VM#: 8648
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: JS2012
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 38° 8.4' N ( 38.14000) LONGITUDE: 121° 54.4' W (-121.90700)
The bench mark is a disk set in a concrete post projecting 6 cm (0.2 ft) above
the ground, at a point where powerline extends over and across the road, 31.55 m
(103.5 ft) NE of bench mark NO 3 1949, 27.43 m (90.0 ft) east of the center of a
triangle formed by the junction of the main road with a gravel roading leading
NW to the boat landings, 10.52 m (34.5 ft) east of the centerline of the road,
1.25 m (4.1 ft) north of a powerline pole, 0.52 m (1.7 ft) west of the fence
line, and level with the road.
BENCH MARK STAMPING: 5307 E 1977
DESIGNATION: 941 5307 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 8650
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 8.2' N ( 38.13670) LONGITUDE: 121° 54.4' W (-121.90700)
The bench mark is a disk 6.10 m (20.0 ft) NE from the centerline of Meins
Landing Road, 2.29 m (7.5 ft) NNW from a telephone pole, and 0.91 m (3.0 ft) SE
from the first fence post NW of the telephone pole. The mark is set 3 cm (0.1
ft) below grade, crimped to the top of a copper-clad steel rod driven 3.7 m (12
ft) and encased in a PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9415307 PUBLICATION DATE: 03/09/2004
Name: MEINS LANDING, MONTEZUMA SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 8.2' N ( 38.13670)
USGS Quad: DENVERTON Longitude: 121° 54.4' W (-121.90700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Q 555 1956
DESIGNATION: Q 555
MONUMENTATION: Bench Mark disk VM#: 8651
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: JS2011
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 38° 8.2' N ( 38.13670) LONGITUDE: 121° 54.4' W (-121.90700)
The bench mark is a disk set in the top of a concrete post 0.61 m (2.0 ft) above
the road, located 51.33 m (168.4 ft) east of and across the road from the east
corner of the caretaker cottage, 12.80 m (42.0 ft) NE of the centerline of the
road, 0.46 m (1.5 ft) west of the fence cover post, 0.40 m (1.3 ft) SE of a
witness post, and 0.37 m (1.2 ft) SW of the fence..
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9415307 PUBLICATION DATE: 03/09/2004
Name: MEINS LANDING, MONTEZUMA SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 8.2' N ( 38.13670)
USGS Quad: DENVERTON Longitude: 121° 54.4' W (-121.90700)
T I D A L D A T U M S
Tidal datums at MEINS LANDING, MONTEZUMA SLOUGH based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: February 1978 - May 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:
MEAN HIGHER HIGH WATER MHHW = 1.540
MEAN HIGH WATER MHW = 1.390
MEAN SEA LEVEL MSL = 0.816
MEAN TIDE LEVEL MTL = 0.804
MEAN LOW WATER MLW = 0.219
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5307 D 1977 5.872 4.482
NO 4 1949 2.939 1.549
5307 E 1977 2.394 1.004
Q 555 1956 4.759 3.369
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9415307 PUBLICATION DATE: 03/09/2004
Name: MEINS LANDING, MONTEZUMA SLOUGH
CA
NOAA Chart: 18656 Latitude: 38° 8.2' N ( 38.13670)
USGS Quad: DENVERTON Longitude: 121° 54.4' W (-121.90700)
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.