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Bench Mark Sheet for 9413643, Tidal Creek, Elkhorn Slough

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                                                
Station ID: 9413643                         PUBLICATION DATE:  05/22/2013
Name:       TIDAL CREEK, ELKHORN SLOUGH                       
            CA
NOAA Chart: 18680                           Latitude:   36° 50.0' N (  36.83333)
USGS Quad:  PRUNEDALE                       Longitude: 121° 44.7' W (-121.74500)


Take Highway 1 to Moss Landing at the power plant, turn east onto Dolan Road for
3.5 miles, make a left on Elkhorn Road,  proceed about 5 miles to Kirby Park
entrance on the left.  Proceed to travel via boat to GPS coordinates.  Proceed
south from boat landing.  Head east into the largest tidal creek south of
landing on west side of slough approximately 0.5 miles and follow creek to the
tide station platform made of wood.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  3643 A 2008
                         DESIGNATION:          941 3643 A

MONUMENTATION:           Tidal Station disk                    VM#:        18603
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   36° 50.0' N (  36.83330)          LONGITUDE: 121° 44.8' W (-121.74700)


The bench mark is located in Elkhorn Slough at Tidal Creek SW of Moss landing,
8.29 m (27.2 ft) south of a cluster of California Live Oaks, 5.00 m (16.4 ft)
west of the ecotone, and 0.67m (2.2 ft) east of a witness post sign posted on a
sign posted "Private licensed pheasant club, Elkhorn Slough, David Packard. The
bench mark is crimped to a stainless steel rod is driven 10.1 m (33 ft) to
refusal and encased in a 6" PVC pipe with lid cover.      

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                                                
Station ID: 9413643                         PUBLICATION DATE:  05/22/2013
Name:       TIDAL CREEK, ELKHORN SLOUGH                       
            CA
NOAA Chart: 18680                           Latitude:   36° 50.0' N (  36.83333)
USGS Quad:  PRUNEDALE                       Longitude: 121° 44.7' W (-121.74500)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  3643 B 2008
                         DESIGNATION:          941 3643 B

MONUMENTATION:           Tidal Station disk                    VM#:        18604
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   36° 50.0' N (  36.83330)          LONGITUDE: 121° 44.8' W (-121.74700)


The bench mark is located in Elkhorn Slough at Tidal Creek SW of Moss landing,
60.0 m (197 ft) SW of the Tidal Creek tide station, 30.00 m (98.4 ft) NE of the
SW ecotone, and 4.0 m (13 ft) NW of the slough creek edge.  The bench mark is
crimped to a stainless steel rod driven 12.6 m (41 ft) to refusal and encased in
a PVC pipe with a cover lid.        



                         BENCH MARK STAMPING:  3643 C 2008
                         DESIGNATION:          941 3643 C

MONUMENTATION:           Tidal Station disk                    VM#:        18605
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   36° 50.0' N (  36.83330)          LONGITUDE: 121° 44.7' W (-121.74500)


The bench mark is located in Elkhorn Slough at Tidal Creek SW of Moss landing,
28.50 m (93.5 ft) south of a small wooden boat landing, 19.70 m (64.6 ft)  north
of a large group of California Live Oaks, and 15.70 m (51.5 ft) NW of the slough
creek edge.  The bench mark is crimped to a stainless steel rod driven 9.4 m
(30.7 ft) to refusal and encased in a PVC pipe with a cover lid.    

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                                                
Station ID: 9413643                         PUBLICATION DATE:  05/22/2013
Name:       TIDAL CREEK, ELKHORN SLOUGH                       
            CA
NOAA Chart: 18680                           Latitude:   36° 50.0' N (  36.83333)
USGS Quad:  PRUNEDALE                       Longitude: 121° 44.7' W (-121.74500)


                            T I D A L   D A T U M S 


Tidal datums at TIDAL CREEK, ELKHORN SLOUGH based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           July 2008 - September 2008
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9413450 MONTEREY, MONTEREY HARBOR


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     MEAN HIGHER HIGH WATER                     MHHW   =  1.633
     MEAN HIGH WATER                            MHW    =  1.417
     MEAN SEA LEVEL                             MSL    =  0.874
     MEAN TIDE LEVEL                            MTL    =  0.871
     MEAN LOW WATER                             MLW    =  0.325
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     3643 A 2008                                 2.344    0.927
     3643 B 2008                                 1.413   -0.004
     3643 C 2008                                 2.394    0.976


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  4

                                                                                
Station ID: 9413643                         PUBLICATION DATE:  05/22/2013
Name:       TIDAL CREEK, ELKHORN SLOUGH                       
            CA
NOAA Chart: 18680                           Latitude:   36° 50.0' N (  36.83333)
USGS Quad:  PRUNEDALE                       Longitude: 121° 44.7' W (-121.74500)


                             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.

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Products available at 9413643 Tidal Creek, Elkhorn Slough,

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services