Bench Mark Sheet for 9445958, BREMERTON 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 9445958                         PUBLICATION DATE:  04/13/2005
Name:       BREMERTON                                         
            WA
NOAA Chart: 18449                           Latitude:   47° 33.7' N (  47.56170)
USGS Quad:  BREMERTON EAST                  Longitude: 122° 37.4' W (-122.62300)


To reach the tidal bench marks from the intersection of Washington Avenue and
First Street in Bremerton, proceed 0.5 km (0.3 mi) SE along First Street to the
Washington State Ferry Terminal Landing.  The tidal bench marks are along
Farragut Avenue in the Puget Sound Naval Shipyard.  The tide gage and staff were
on the ferry terminal.


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


                 PRIMARY BENCH MARK STAMPING:  2 1934
                         DESIGNATION:          944 5958 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         9103
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  SY0915
SETTING CLASSIFICATION:  Concrete coping                       OPUS PID:        
LATITUDE:   47° 33.7' N (  47.56170)          LONGITUDE: 122° 37.4' W (-122.62300)


The primary bench mark is a disk set in the concrete coping at the NE corner of
Drydock No. 2, 61 m (200 ft) south of Building 427, 9.20 m (30.2 ft) east of the
centerline of the drydock, and 5.85 m (19.2 ft) south of the north end.



                         BENCH MARK STAMPING:  3 1934
                         DESIGNATION:          944 5958 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:         9104
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  SY0919
SETTING CLASSIFICATION:  Concrete coping                       OPUS PID:        
LATITUDE:   47° 33.7' N (  47.56170)          LONGITUDE: 122° 37.4' W (-122.62300)


The bench mark is a disk set in the concrete coping at the NE corner of Drydock
No. 1, 10.52 m (34.5 ft) east of the centerline of the drydock, and 0.37 m (1.2
ft) NE of the NE edge of the dock.

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

                                                                                
Station ID: 9445958                         PUBLICATION DATE:  04/13/2005
Name:       BREMERTON                                         
            WA
NOAA Chart: 18449                           Latitude:   47° 33.7' N (  47.56170)
USGS Quad:  BREMERTON EAST                  Longitude: 122° 37.4' W (-122.62300)


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


                         BENCH MARK STAMPING:  4 1934
                         DESIGNATION:          944 5958 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:         9105
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  SY0920
SETTING CLASSIFICATION:  Concrete coping                       OPUS PID:        
LATITUDE:   47° 33.7' N (  47.56170)          LONGITUDE: 122° 37.4' W (-122.62300)


The bench mark is a disk set in the concrete coping at the north end of Drydock
Number 3, 14.54 m (47.7 ft) west of the east drydock wall, and 5.18 m (17 ft)
east of the centerline of the drydock.

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

                                                                                
Station ID: 9445958                         PUBLICATION DATE:  04/13/2005
Name:       BREMERTON                                         
            WA
NOAA Chart: 18449                           Latitude:   47° 33.7' N (  47.56170)
USGS Quad:  BREMERTON EAST                  Longitude: 122° 37.4' W (-122.62300)


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


                         BENCH MARK STAMPING:   
                         DESIGNATION:          944 5938 UNSTAMPED 81PSNY
                         ALIAS:                NO STAMPING 1

MONUMENTATION:           Spike                                 VM#:         9107
AGENCY:                  US Navy (USN)                         IDB PID#:  SY0917
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   47° 33.7' N (  47.56170)          LONGITUDE: 122° 37.4' W (-122.62300)


The bench mark is a brass plug set in the top of a concrete monument on the
north side of Farragut Avenue, 61 m (200 ft) north of the north end of Drydock
Number 2, in the middle of the intersection of Farragut Avenue and a paved road
leading north along the east edge of Building 427, inside a 0.21 m (0.7 ft)
diameter iron manhole cover with SURVEY cast in it, and 0.15 m (0.5 ft) below
pavement level.  Note:  The bench mark is designated locally as 81 (P.S.N.Y.)
RESET.



                         BENCH MARK STAMPING:  BM TIDAL 8 RESET 1988
                         DESIGNATION:          944 5958 TIDAL 8 RESET

MONUMENTATION:           Vertical Control disk                 VM#:        16475
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  SY5718
SETTING CLASSIFICATION:  Pavement                              OPUS PID:        
LATITUDE:   47° 33.8' N (  47.56330)          LONGITUDE: 122° 37.5' W (-122.62500)


The bench mark is a disk set in sidewalk at the NE corner of the intersection of
Washington Avenue and First Street, 1.22 m (4.0 ft) from the corner entrance to
a building marked with the word Grainger inscribed in stone above the door.

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

                                                                                
Station ID: 9445958                         PUBLICATION DATE:  04/13/2005
Name:       BREMERTON                                         
            WA
NOAA Chart: 18449                           Latitude:   47° 33.7' N (  47.56170)
USGS Quad:  BREMERTON EAST                  Longitude: 122° 37.4' W (-122.62300)


                            T I D A L   D A T U M S 


Tidal datums at BREMERTON based on:

     LENGTH OF SERIES:      7 MONTHS
     TIME PERIOD:           August 1977 - February 1978
     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   =  3.578
     MEAN HIGH WATER                            MHW    =  3.310
     MEAN TIDE LEVEL                            MTL    =  2.089
     MEAN SEA LEVEL                             MSL    =  2.080
     MEAN LOW WATER                             MLW    =  0.868
     North American Vertical Datum              NAVD88 =  0.769
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     2 1934                                      5.213    1.903
     3 1934                                      5.236    1.926
     4 1934                                      5.223    1.913
     944 5938 UNSTAMPED 81PSNY                   5.185    1.875
     BM TIDAL 8 RESET 1988                      10.039    6.729


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

                                                                                
Station ID: 9445958                         PUBLICATION DATE:  04/13/2005
Name:       BREMERTON                                         
            WA
NOAA Chart: 18449                           Latitude:   47° 33.7' N (  47.56170)
USGS Quad:  BREMERTON EAST                  Longitude: 122° 37.4' W (-122.62300)


                             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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