Superseded Bench Mark Sheet for 9447659, EVERETT WA

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  09/29/1988
Station ID: 9447659                                SUPERCEDED DATE:   04/21/2003
Name:       EVERETT, POSSESSION SOUND                         
            WASHINGTON
NOAA Chart: 18444                                  Latitude:         47° 58.8' N
USGS Quad:  EVERETT                                Longitude:       122° 13.4' W


To reach the tidal bench marks from the intersection of Rucker Avenue and Hewitt
Avenue in Everett, proceed west on Hewitt Avenue, cross under the Burlington
Northern railroad tracks at the termination of Hewitt Avenue at the waterfront,
turn left at Terminal Street and continue 0.15 mile (0.2 km) to the Port of
Everett Pier 1 Complex, turn right and proceed through the pier 1 NW gate, and
then west to the extreme seaward side of pier 1.  The bench marks are on the
shore area around the pier.  The tide gage and staff were at the center of the
pier end. 


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


                 PRIMARY BENCH MARK STAMPING:  5 1934

MONUMENTATION:           Survey Disk                               VM#:     9204
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Step


The bench mark is set in the lowest step at the NW end of the NE abutment of the
railroad bridge over Wall Street, 450 feet (137 m) SW of the SW end of the
passenger station, 18.5 feet (5.6 m) NE of the centerline of Wall Street, 17.0
feet (5.2 m) NW of the NW rail, 15.0 feet (4.6 m) below the track, 3.0 feet (0.9
m) SE of the SE end of the concrete retaining wall, and 2.5 feet (0.8 m) above
the sidewalk level.



                         BENCH MARK STAMPING:  3 1927

MONUMENTATION:           Survey Disk                               VM#:     9201
AGENCY:                                                            PID#:  SY0002
SETTING CLASSIFICATION:  Concrete Battery Well Base


The bench mark is set in concrete on the battery well base of Semaphore No. 326
on the lower track of the Great Northern Railway, 130 feet (40 m) north of the
Hewitt Avenue crossing, 450 feet (137 m) north of the railroad station, 13 rails
NE of a line along the NE side of the passenger station, 8.0 feet (2.4 m) SW of
the west leg of the signal, 8.1 feet (2.5 m) NW of the NW rail of the lower
track, and 0.5 foot (0.15 m) above ground.

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

                                                   PUBLICATION DATE:  09/29/1988
Station ID: 9447659                                SUPERCEDED DATE:   04/21/2003
Name:       EVERETT, POSSESSION SOUND                         
            WASHINGTON
NOAA Chart: 18444                                  Latitude:         47° 58.8' N
USGS Quad:  EVERETT                                Longitude:       122° 13.4' W


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


                         BENCH MARK STAMPING:  4 1934

MONUMENTATION:           Survey Disk                               VM#:     9202
AGENCY:                                                            PID#:  SY0004
SETTING CLASSIFICATION:  Concrete Abutment


The bench mark is set into the concrete on the SE end of the NE concrete
abutment of the steel railroad bridge over Hewitt Avenue, 330 feet (100 m) north
of the railroad station, 13 rails NE of the NE end of the passenger station, 8.5
feet (2.6 m) SE of the SE rail, 7.0 feet (2.1 m) above the sidewalk, and 4.0
feet (1.2 m) below the level of the overhead tracks.



                         BENCH MARK STAMPING:  J 7 ELEV 23.025 FT

MONUMENTATION:           Survey Disk                               VM#:     9203
AGENCY:                                                            PID#:  SY0003
SETTING CLASSIFICATION:  Concrete Abutment


The bench mark is set into the concrete at the Hewitt Avenue overhead bridge No.
406, 300 feet (91 m) NE of the NE end of the railroad station, in the top of the
NW corner of the west stone pier supporting steel column on the south curb line
of Hewitt Avenue, 16.0 feet (4.9 m) north of the retaining wall face at the SW
end of underpass, and 17.0 feet (5.2 m) south of the centerline of the south
lane of Hewitt Avenue.

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

                                                   PUBLICATION DATE:  09/29/1988
Station ID: 9447659                                SUPERCEDED DATE:   04/21/2003
Name:       EVERETT, POSSESSION SOUND                         
            WASHINGTON
NOAA Chart: 18444                                  Latitude:         47° 58.8' N
USGS Quad:  EVERETT                                Longitude:       122° 13.4' W


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


                         BENCH MARK STAMPING:  7659 H 1976

MONUMENTATION:           Survey Disk                               VM#:     9205
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set in concrete in the NW corner of a 6 x 12 x 1 foot (2 x 4 x
0.3 m) concrete foundation, at the entrance to the Port of Everett Pier 1
complex, 80.0 feet (24.4 m) west of the lower railroad tracks, 62.0 feet (18.9
m) NE of a guard shelter and telephone booth, 28.0 feet (8.5 m) SW of the
northern entrance gate, 6.0 feet (1.8 m) south of an east-west chain link fence,
and 4.5 feet (1.4 m) NW of a fire hydrant.

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

                                                   PUBLICATION DATE:  09/29/1988
Station ID: 9447659                                SUPERCEDED DATE:   04/21/2003
Name:       EVERETT, POSSESSION SOUND                         
            WASHINGTON
NOAA Chart: 18444                                  Latitude:         47° 58.8' N
USGS Quad:  EVERETT                                Longitude:       122° 13.4' W


                            T I D A L   D A T U M S 


Tidal datums at EVERETT, POSSESSION SOUND based on:

     LENGTH OF SERIES:      10 MONTHS
     TIME PERIOD:           FEB-JULY AND SEPT.-DEC. 1977
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  9447130 SEATTLE


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

     HIGHEST OBSERVED WATER LEVEL (12/06/1977)         =  14.35
     MEAN HIGHER HIGH WATER                     MHHW   =  11.11
     MEAN HIGH WATER                            MHW    =  10.25
     MEAN TIDE LEVEL                            MTL    =   6.52
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   5.93
     MEAN LOW WATER                             MLW    =   2.80
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (06/02/1977)         =  -3.60

   * NGVD reference based on elevations published in Quad Everett, 1973, and NOS
     leveling of 1976. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     5 1934                                     23.37     13.12
     3 1927                                     22.59     12.34
     4 1934                                     42.17     31.92
     J 7 ELEV 23.025 FT                         29.05     18.80
     7659 H 1976                                18.27      8.02


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

                                                   PUBLICATION DATE:  09/29/1988
Station ID: 9447659                                SUPERCEDED DATE:   04/21/2003
Name:       EVERETT, POSSESSION SOUND                         
            WASHINGTON
NOAA Chart: 18444                                  Latitude:         47° 58.8' N
USGS Quad:  EVERETT                                Longitude:       122° 13.4' W


                             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 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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