Bench Mark Sheet for 9446742, BARRON POINT, LITTLE SKOOKUM INLET ENT WA

Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 9446742                         PUBLICATION DATE:  05/01/2003
Name:       BARRON POINT, LITTLE SKOOKUM INLET ENT            
            WA
NOAA Chart: 18448                           Latitude:   47°  9.4' N (  47.15670)
USGS Quad:  SHELTON                         Longitude: 123°  0.5' W (-123.00800)


To reach the tidal bench marks from Olympia, proceed 1.6 km (1.0 mi) north on
U.S. Highway 101 toward Shelton beyond the intersection with Highway 108 to
Lynch Road, then east on Lynch Road for 7.2 km (4.5 mi) to the Bay East
community marked by a sign, then turn east into the community and follow the
main road straight to the boat ramp. The bench marks are near the boat ramp and
SW along the shoreline. The tide gauge and staff were on the Bay East pier.


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


                 PRIMARY BENCH MARK STAMPING:  6742 C 1988
                         DESIGNATION:          944 6742 C

MONUMENTATION:           Tidal Station disk                    VM#:        12033
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Bedrock outcrop                       OPUS PID:        
LATITUDE:   47°  9.4' N (  47.15670)          LONGITUDE: 123°  0.3' W (-123.00500)


The primary bench mark is a disk set in a small bedrock outcrop, 165 m (540 ft)
SW of the Bay East pier, 62 m (204 ft) NE of a wooden pier (in poor condition),
9 m (28 ft) SE of a 0.30 m x 0.76 m ((1.0 ft x 2.5 ft) concrete landing
supporting wooden stairs leading down from the bluff, and 0.30 m (1.0 ft) above
the beach.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 9446742                         PUBLICATION DATE:  05/01/2003
Name:       BARRON POINT, LITTLE SKOOKUM INLET ENT            
            WA
NOAA Chart: 18448                           Latitude:   47°  9.4' N (  47.15670)
USGS Quad:  SHELTON                         Longitude: 123°  0.5' W (-123.00800)


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


                         BENCH MARK STAMPING:  6742 A 1988
                         DESIGNATION:          944 6742 A

MONUMENTATION:           Tidal Station disk                    VM#:        12031
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete boat ramp                    OPUS PID:        
LATITUDE:   47°  9.4' N (  47.15670)          LONGITUDE: 123°  0.3' W (-123.00500)


The bench mark is a disk set in a concrete boat ramp at Barron Point, 39 m (128
ft) NW of the inshore end of the Bay East pier, 7 m (24 ft) NW of the north end
of a wooden log embankment wall, and 0.46 m (1.5 ft) NW of the SE edge of the
ramp.



                         BENCH MARK STAMPING:  6742 B 1988
                         DESIGNATION:          944 6742 B

MONUMENTATION:           Tidal Station disk                    VM#:        12032
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   47°  9.4' N (  47.15670)          LONGITUDE: 123°  0.3' W (-123.00500)


The bench mark is a disk set in a 6 m x 6 m (20 ft x 20 ft) concrete foundation
for a small building immediately shoreward of the inshore end of the Bay East
pier, 40.45 m (132.7 ft) SW of bench mark 6742 A 1988, 1.01 m (3.3 ft) NE of the
north corner of the building, and 0.21 m (0.7 ft) SW of the NE edge of the
foundation.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                                                
Station ID: 9446742                         PUBLICATION DATE:  05/01/2003
Name:       BARRON POINT, LITTLE SKOOKUM INLET ENT            
            WA
NOAA Chart: 18448                           Latitude:   47°  9.4' N (  47.15670)
USGS Quad:  SHELTON                         Longitude: 123°  0.5' W (-123.00800)


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


                         BENCH MARK STAMPING:  6742 D 1988
                         DESIGNATION:          944 6742 D

MONUMENTATION:           Tidal Station disk                    VM#:        12034
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Granite bedrock outcrop               OPUS PID:        
LATITUDE:   47°  9.4' N (  47.15670)          LONGITUDE: 123°  0.3' W (-123.00500)


The bench mark is a disk set in a 1 m x 2 m (3 ft x 6 ft) granite bedrock
outcrop, 59 m (195 ft) SW of a wooden dock, 50 m (165 ft) NE of a large 4 m (12
ft) high rock, and 7 m (24 ft) SE of the foot of a bluff.



                         BENCH MARK STAMPING:  6742 E 1988
                         DESIGNATION:          944 6742 E

MONUMENTATION:           Tidal Station disk                    VM#:        12035
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  High rock                             OPUS PID:        
LATITUDE:   47°  9.4' N (  47.15670)          LONGITUDE: 123°  0.3' W (-123.00500)


The bench mark is a disk set vertically in the north face of a 4 m (12 ft) high
rock, 50 m (165 ft) SW of bench mark 6742 D 1988, and 1 m (4 ft) above the
beach.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                                                
Station ID: 9446742                         PUBLICATION DATE:  05/01/2003
Name:       BARRON POINT, LITTLE SKOOKUM INLET ENT            
            WA
NOAA Chart: 18448                           Latitude:   47°  9.4' N (  47.15670)
USGS Quad:  SHELTON                         Longitude: 123°  0.5' W (-123.00800)


                            T I D A L   D A T U M S 


Tidal datums at BARRON POINT, LITTLE SKOOKUM INLET ENT based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           October 1988 - October 1988
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9447130 SEATTLE, PUGET SOUND


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

     MEAN HIGHER HIGH WATER                     MHHW   =  4.426
     MEAN HIGH WATER                            MHW    =  4.130
     MEAN SEA LEVEL                             MSL    =  2.527
     MEAN TIDE LEVEL                            MTL    =  2.525
     MEAN LOW WATER                             MLW    =  0.920
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6742 C 1988                                 3.861   -0.269
     6742 A 1988                                 4.938    0.808
     6742 B 1988                                 5.473    1.343
     6742 D 1988                                 4.225    0.095
     6742 E 1988                                 5.047    0.917


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  5

                                                                                
Station ID: 9446742                         PUBLICATION DATE:  05/01/2003
Name:       BARRON POINT, LITTLE SKOOKUM INLET ENT            
            WA
NOAA Chart: 18448                           Latitude:   47°  9.4' N (  47.15670)
USGS Quad:  SHELTON                         Longitude: 123°  0.5' W (-123.00800)


                             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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