Bench Mark Sheet for 9446545, TACOMA 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 9446545                         PUBLICATION DATE:  08/09/2004
Name:       TACOMA                                            
            WA
NOAA Chart: 18453                           Latitude:   47° 15.3' N (  47.25500)
USGS Quad:  TACOMA NORTH                    Longitude: 122° 25.9' W (-122.43200)


To reach the tidal bench marks from the intersection of Pacific Avenue and East
11st Street in Tacoma, Washington, proceed east along 11th Street for 0.8 km
(0.5 mi), crossing over the 11th Street Bridge and city waterway to East E
Street, then turn left and proceed north for one block, then turn left again and
 proceed west on 11th Street lower level and proceed 0.3 km (0.2 mi) to the
Tacoma City Fire boat station and slip, adjacent to the north side of the 11th
Street bridge.  The bench marks are located along the Railroad tracks around the
station.  The tide gage and staff were located on a piling clump 22 m (72 ft)
west of the onshore fire boat station.


                         T I D A L   B E N C H   M A R K S
                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 9446545                         PUBLICATION DATE:  08/09/2004
Name:       TACOMA                                            
            WA
NOAA Chart: 18453                           Latitude:   47° 15.3' N (  47.25500)
USGS Quad:  TACOMA NORTH                    Longitude: 122° 25.9' W (-122.43200)


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


                 PRIMARY BENCH MARK STAMPING:  E 406 1965
                         DESIGNATION:          E 406

MONUMENTATION:           Bench Mark disk                       VM#:         9161
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  SY0534
SETTING CLASSIFICATION:  Concrete curb                         OPUS PID:        
LATITUDE:   47° 15.2' N (  47.25330)          LONGITUDE: 122° 25.8' W (-122.43000)


The primary bench mark is a disk set in the top of the east end of the south
concrete curb of the 11th Street bridge over the city waterway, 1.83 m (6.0 ft)
south of the south curb of East 11th Street, 0.15 m (0.5 ft) north of the east
end of a guard rail, 0.15 m (0.5 ft) north of the NW corner of the top of five
concrete steps, and about level with the street.

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

                                                                                
Station ID: 9446545                         PUBLICATION DATE:  08/09/2004
Name:       TACOMA                                            
            WA
NOAA Chart: 18453                           Latitude:   47° 15.3' N (  47.25500)
USGS Quad:  TACOMA NORTH                    Longitude: 122° 25.9' W (-122.43200)


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


                         BENCH MARK STAMPING:  F 406 1965
                         DESIGNATION:          F 406

MONUMENTATION:           Bench Mark disk                       VM#:         9162
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  SY0535
SETTING CLASSIFICATION:  Retaining wall                        OPUS PID:        
LATITUDE:   47° 15.5' N (  47.25830)          LONGITUDE: 122° 25.2' W (-122.42000)


The bench mark is a disk set in the top of the SW end of the SE concrete
retaining wall for the 11th Street bridge over the Puyallup River, 1.37 m (4.5
ft) SW of the SE curb of East 11th Street, 1.37 m (4.5 ft) NE of the SW end of a
guardrail, 0.15 m (0.5 ft) higher than the street, and level with the sidewalk.



                         BENCH MARK STAMPING:  TIDE 22 1933

MONUMENTATION:           Tidal Station disk                    VM#:        13319
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  SY0536
SETTING CLASSIFICATION:  Sidewalk                              OPUS PID:        
LATITUDE:   47° 15.8' N (  47.26330)          LONGITUDE: 122° 24.8' W (-122.41300)


The bench mark is a disk set in the concrete sidewalk at the NE end of the East
11th Street Bridge over the Puyallup River, in a 1 m (3 ft) square concrete slab
in the angle formed by the sidewalks, 2.74 m (9.0 ft) NW of the NW curb of East
11th Street, 0.3 m (1 ft) NW of a lamp post, which is also the NE end of the
iron railing along the NW side of the bridge.

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

                                                                                
Station ID: 9446545                         PUBLICATION DATE:  08/09/2004
Name:       TACOMA                                            
            WA
NOAA Chart: 18453                           Latitude:   47° 15.3' N (  47.25500)
USGS Quad:  TACOMA NORTH                    Longitude: 122° 25.9' W (-122.43200)


                            T I D A L   D A T U M S 


Tidal datums at TACOMA based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           July 1977 - July 1977
     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   =  3.605
     MEAN HIGH WATER                            MHW    =  3.337
     MEAN TIDE LEVEL                            MTL    =  2.105
     MEAN SEA LEVEL                             MSL    =  2.097
     MEAN LOW WATER                             MLW    =  0.873
     North American Vertical Datum              NAVD88 =  0.795
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     E 406 1965                                  7.146    3.809
     F 406 1965                                  8.010    4.673
     TIDE 22 1933                                5.888    2.551


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

                                                                                
Station ID: 9446545                         PUBLICATION DATE:  08/09/2004
Name:       TACOMA                                            
            WA
NOAA Chart: 18453                           Latitude:   47° 15.3' N (  47.25500)
USGS Quad:  TACOMA NORTH                    Longitude: 122° 25.9' W (-122.43200)


                             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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