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Bench Mark Sheet for 9445832, BROWNSVILLE 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 9445832                         PUBLICATION DATE:  08/11/2004
Name:       BROWNSVILLE                                       
            WA
NOAA Chart: 18449                           Latitude:   47° 39.1' N (  47.65170)
USGS Quad:  BREMERTON EAST                  Longitude: 122° 36.9' W (-122.61500)


To reach the tidal bench marks proceed 0.16 km (0.1 mi) east from the
intersection of State Highway 303 and Ogle Road, on the east side of
Brownsville, Washington.  The bench marks are located in the vicinity of the
Brownsville Marina.  The tide gage and staff were located at the Brownsville
Marina.


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


                 PRIMARY BENCH MARK STAMPING:  BM 5 1975
                         DESIGNATION:          944 5832 TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:         9092
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Boulder                               OPUS PID:        
LATITUDE:   47° 38.6' N (  47.64330)          LONGITUDE: 122° 36.9' W (-122.61500)


The bench mark is a disk located north of the Brownsville Marina, in a 2 m x 1 m
(6 ft x 3 ft) boulder, 55 m (182 ft) north along the shoreline from bench mark
5832 A 1980, 3 m (10 ft) north of the north face of a boat house, set 0.6 m (2
ft) above ground level.

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

                                                                                
Station ID: 9445832                         PUBLICATION DATE:  08/11/2004
Name:       BROWNSVILLE                                       
            WA
NOAA Chart: 18449                           Latitude:   47° 39.1' N (  47.65170)
USGS Quad:  BREMERTON EAST                  Longitude: 122° 36.9' W (-122.61500)


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


                         BENCH MARK STAMPING:  5832 A 1980
                         DESIGNATION:          944 5832 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9089
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete slab                         OPUS PID:        
LATITUDE:   47° 38.6' N (  47.64330)          LONGITUDE: 122° 36.9' W (-122.61500)


The bench mark is a disk set at the SW corner of a 3 m (10 ft) square concrete
slab at the Brownsville Marina, 15.85 m (52.0 ft) SE of the door of the marina
retail store, 8 m (25 ft) SW of the foot of the marina pier, and 7 m (22 ft)
north of the center of the boat ramp.



                         BENCH MARK STAMPING:  5832 B 1980
                         DESIGNATION:          944 5832 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9090
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   47° 38.6' N (  47.64330)          LONGITUDE: 122° 36.9' W (-122.61500)


The bench mark is a disk located at the Brownsville Marina in the wedge
foundation, at the base of a sliding overhead garage door on the west side of
the Brownsville Marina building, 27 m (90 ft) NW of bench mark 5832 A 1980, 14 m
(45 ft) of a yellow fire hydrant and 4 m (13 ft) north of the SW corner of the
building.

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

                                                                                
Station ID: 9445832                         PUBLICATION DATE:  08/11/2004
Name:       BROWNSVILLE                                       
            WA
NOAA Chart: 18449                           Latitude:   47° 39.1' N (  47.65170)
USGS Quad:  BREMERTON EAST                  Longitude: 122° 36.9' W (-122.61500)


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


                         BENCH MARK STAMPING:  5832 C 1980
                         DESIGNATION:          944 5832 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9091
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete steps                        OPUS PID:        
LATITUDE:   47° 38.6' N (  47.64330)          LONGITUDE: 122° 36.9' W (-122.61500)


The bench mark is a disk set into the concrete steps of the sewage pump station,
north of the Brownsville Marina building, 34 m (111 ft) north of bench mark 5832
B 1980, 10 m (32 ft) east of the centerline of Ogle Road, on the west side and
0.6 m (2 ft) west of the door of a sewage pumping station.

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

                                                                                
Station ID: 9445832                         PUBLICATION DATE:  08/11/2004
Name:       BROWNSVILLE                                       
            WA
NOAA Chart: 18449                           Latitude:   47° 39.1' N (  47.65170)
USGS Quad:  BREMERTON EAST                  Longitude: 122° 36.9' W (-122.61500)


                            T I D A L   D A T U M S 


Tidal datums at BROWNSVILLE based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           February 1980 - February 1980
     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   =  3.607
     MEAN HIGH WATER                            MHW    =  3.339
     MEAN TIDE LEVEL                            MTL    =  2.115
     MEAN SEA LEVEL                             MSL    =  2.110
     MEAN LOW WATER                             MLW    =  0.891
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     BM 5 1975                                   3.649    0.310
     5832 A 1980                                 4.972    1.633
     5832 B 1980                                 5.173    1.834
     5832 C 1980                                 7.074    3.735


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

                                                                                
Station ID: 9445832                         PUBLICATION DATE:  08/11/2004
Name:       BROWNSVILLE                                       
            WA
NOAA Chart: 18449                           Latitude:   47° 39.1' N (  47.65170)
USGS Quad:  BREMERTON EAST                  Longitude: 122° 36.9' W (-122.61500)


                             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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Revised: 08/08/2018
NOAA / National Ocean Service
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