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Bench Mark Sheet for 9452123, TAKU HARBOR AK

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 9452123                         PUBLICATION DATE:  06/18/2014
Name:       TAKU HARBOR                                       
            AK
NOAA Chart: 17314                           Latitude:   58°  4.1' N (  58.06830)
USGS Quad:  Juneau A-1                      Longitude: 134°  0.7' W (-134.01200)


To reach the tidal bench marks proceed to Taku Harbor located on the east side
of Stephens Passage south of Taku Inlet, continue into Taku Harbor to the
floating dock at the NE end of the harbor.  The bench marks are located along
the shoreline and extend north and south from the end of the dock.  The tide
gage was mounted 3 m (10 ft) north of the end of the dock with the orifice
attached to a piling on the north side of the dock.  The staff was mounted on a
piling on the north side of the dock.


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


                 PRIMARY BENCH MARK STAMPING:  1
                         DESIGNATION:          945 2123 1

MONUMENTATION:           Tidal Station disk                    VM#:         9399
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Rock Outcrop                          OPUS PID:        
LATITUDE:   58°  4.1' N (  58.06830)          LONGITUDE: 134°  0.6' W (-134.01000)


The primary bench mark is a disk set in the top of a large prominent rock 2 m x
2 m x 1 m  (5 ft x 7 ft x 3 ft), SE of the ruins to the old cannery, 105 m (345
ft) NE of bench mark 4 1959, 21 m (70 ft) NE of the shoreline, 14 m (45 ft) ESE
of a small conugated iron shed, 14 m (45 ft) WSW of the NW corner of the red
shed, 5 m (18 ft) NW of the tree line, and 4.72 m (15.5 ft) NNW of the NW corner
of a red one-room house.

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

                                                                                
Station ID: 9452123                         PUBLICATION DATE:  06/18/2014
Name:       TAKU HARBOR                                       
            AK
NOAA Chart: 17314                           Latitude:   58°  4.1' N (  58.06830)
USGS Quad:  Juneau A-1                      Longitude: 134°  0.7' W (-134.01200)


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


                         BENCH MARK STAMPING:  4 1959
                         DESIGNATION:          945 2123 4 1959

MONUMENTATION:           Tidal Station disk                    VM#:         9400
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Rock Outcrop                          OPUS PID:        
LATITUDE:   58°  4.1' N (  58.06830)          LONGITUDE: 134°  0.6' W (-134.01000)


The bench mark is a disk set in the top of a large mossey covered shale outcrop
2 m x 2 m x 2 m (5 ft x 7 ft x 5 ft) that juts from under west side of
boardwalk, 27 m (88 ft) WSW from the SW corner of the first green shed south of
the old cannery, 12 m (39 ft) north of the shoreline, 8 m (25 ft) inshore from
the nearest row of pilings to an old dock, and 4 m (14 ft) south of the tree
line.



                         BENCH MARK STAMPING:  5 1959
                         DESIGNATION:          945 2123 5 1959

MONUMENTATION:           Tidal Station disk                    VM#:         9401
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Grey Granite Boulder                  OPUS PID:        
LATITUDE:   58°  4.1' N (  58.06830)          LONGITUDE: 134°  0.6' W (-134.01000)


The bench mark is a disk set in the top of the light gray granite boulder, 1 m x
2 m x 1 m (3 ft x 6 ft x 3 ft) located on the first point south of the ruins of
the old cannery, 37 m (120 ft) SW of the SW corner of an old green house, 20 m
(67 ft) NW of the tree line, 4 m (12 ft) WNW of the west point on the largest
boulder on the beach, and 3 m (9 ft) NE of the shoreline.

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

                                                                                
Station ID: 9452123                         PUBLICATION DATE:  06/18/2014
Name:       TAKU HARBOR                                       
            AK
NOAA Chart: 17314                           Latitude:   58°  4.1' N (  58.06830)
USGS Quad:  Juneau A-1                      Longitude: 134°  0.7' W (-134.01200)


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


                         BENCH MARK STAMPING:  2123 A 1984
                         DESIGNATION:          945 2123 A 1984

MONUMENTATION:           Tidal Station disk                    VM#:         9402
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   58°  4.1' N (  58.06830)          LONGITUDE: 134°  0.6' W (-134.01000)


The bench mark is a disk set flush in a large concrete foundation at the head of
the dock walkway, 23 m (77 ft) SE of bench mark 4 1959, 6 m (21 ft) south of the
tree line, 5.58 m (18.3 ft) east of twin 0.61 m (2.0 ft) diameter fir trees, and
3 m (10 ft) NW of the shoreline.



                         BENCH MARK STAMPING:  2123 B 1984
                         DESIGNATION:          945 2123 B 1984

MONUMENTATION:           Tidal Station disk                    VM#:         9403
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Rock Outcrop                          OPUS PID:        
LATITUDE:   58°  4.1' N (  58.06830)          LONGITUDE: 134°  0.6' W (-134.01000)


The bench mark is a disk set in the top of a rock outcrop, 72 m (237 ft) NE of
bench mark 5 1959, 23 m (77 ft) SSE of the SW corner of an abandoned house on
floats, 8 m (27 ft) east of the shoreline, 7 m (22 ft) west of the tree line.

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

                                                                                
Station ID: 9452123                         PUBLICATION DATE:  06/18/2014
Name:       TAKU HARBOR                                       
            AK
NOAA Chart: 17314                           Latitude:   58°  4.1' N (  58.06830)
USGS Quad:  Juneau A-1                      Longitude: 134°  0.7' W (-134.01200)


                            T I D A L   D A T U M S 


Tidal datums at TAKU HARBOR based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           May 1997 - May 1997
     TIDAL EPOCH:           2007-2011
     CONTROL TIDE STATION:  9452210 JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS


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

     MEAN HIGHER HIGH WATER                     MHHW   =  4.810
     MEAN HIGH WATER                            MHW    =  4.542
     MEAN SEA LEVEL                             MSL    =  2.546
     MEAN TIDE LEVEL                            MTL    =  2.519
     MEAN LOW WATER                             MLW    =  0.496
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     1                                           6.314    1.772
     4 1959                                      4.902    0.360
     5 1959                                      3.590   -0.952
     2123 A 1984                                 4.345   -0.197
     2123 B 1984                                 3.549   -0.993


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

                                                                                
Station ID: 9452123                         PUBLICATION DATE:  06/18/2014
Name:       TAKU HARBOR                                       
            AK
NOAA Chart: 17314                           Latitude:   58°  4.1' N (  58.06830)
USGS Quad:  Juneau A-1                      Longitude: 134°  0.7' W (-134.01200)


                             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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Products available at 9452123 TAKU HARBOR, AK

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services