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Bench Mark Sheet for 9452437, EXCURSION INLET (SOUTH END) 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 9452437                         PUBLICATION DATE:  06/25/2018
Name:       EXCURSION INLET (SOUTH END)                       
            AK
NOAA Chart: 17316                           Latitude:   58° 25.0' N (  58.41670)
USGS Quad:  JUNEAU (B-5)                    Longitude: 135° 26.8' W (-135.44700)


To reach the tidal bench marks from Icy Passage, navigate 18 km (11 mi) east of
Gustavus about 1/3 of the way up Excursion Inlet on the eastern shore near the
main cannery building adjacent to the large pier.  The bench marks are located
in the vicinity of the pier along shore.  The tide gauge was located just north
of the main pier. 


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


                 PRIMARY BENCH MARK STAMPING:  EXCURSION INLET SO. END 5 1964
                         DESIGNATION:          945 2437 EXCURSION 5

MONUMENTATION:           Tidal Station disk                    VM#:        15952
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Concrete step                         OPUS PID:        
LATITUDE:   58° 25.0' N (  58.41670)          LONGITUDE: 135° 26.8' W (-135.44700)


The primary bench mark is a disk set in the third of five concrete steps near
the SW corner of a 30 m x 61 m x 1 m (100 ft x 200 ft x 4 ft) concrete fuel pen,
105 m (345 ft) NE of the east end of the cannery pier, and 10.21 m (33.5 ft)
north of the SW corner of the foundation.

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

                                                                                
Station ID: 9452437                         PUBLICATION DATE:  06/25/2018
Name:       EXCURSION INLET (SOUTH END)                       
            AK
NOAA Chart: 17316                           Latitude:   58° 25.0' N (  58.41670)
USGS Quad:  JUNEAU (B-5)                    Longitude: 135° 26.8' W (-135.44700)


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


                         BENCH MARK STAMPING:  2437 E 1999
                         DESIGNATION:          945 2437 E

MONUMENTATION:           Tidal Station disk                    VM#:        15953
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Loading dock                          OPUS PID:        
LATITUDE:   58° 25.0' N (  58.41670)          LONGITUDE: 135° 26.8' W (-135.44700)


The bench mark is a disk set in the northern corner of a concrete loading dock
for the main building near the pier, 58 m (190 ft) south of bench mark 2437 F
1999, and 15 m (50 ft) NE of the apparent high water line.



                         BENCH MARK STAMPING:  2437 F 1999
                         DESIGNATION:          945 2437 F

MONUMENTATION:           Tidal Station disk                    VM#:        15954
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   58° 25.0' N (  58.41670)          LONGITUDE: 135° 26.8' W (-135.44700)


The bench mark is a disk set in the NW corner of the concrete foundation for a
garbage pit, located outside of a chain link fence but inside an electric fence,
and 140 m (460 ft) SW of bench mark 2437 G 1999.

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

                                                                                
Station ID: 9452437                         PUBLICATION DATE:  06/25/2018
Name:       EXCURSION INLET (SOUTH END)                       
            AK
NOAA Chart: 17316                           Latitude:   58° 25.0' N (  58.41670)
USGS Quad:  JUNEAU (B-5)                    Longitude: 135° 26.8' W (-135.44700)


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


                         BENCH MARK STAMPING:  2437 G 1999
                         DESIGNATION:          945 2437 G

MONUMENTATION:           Tidal Station disk                    VM#:        15955
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Tar deck                              OPUS PID:        
LATITUDE:   58° 25.0' N (  58.41670)          LONGITUDE: 135° 26.8' W (-135.44700)


The bench mark is a disk set in the tar deck near the NW corner of a 30 m x 61 m
x 1 m (100 ft x 200 ft x 4 ft) concrete fuel pen, just outside of the
chain/barbwire fence near tank D1, and 47 m (155 ft) NW of bench mark EXCURSION
INLET SO. END 5 1964.



                         BENCH MARK STAMPING:  2437 H 1999
                         DESIGNATION:          945 2437 H

MONUMENTATION:           Tidal Station disk                    VM#:        15956
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete deck                         OPUS PID:        
LATITUDE:   58° 25.0' N (  58.41670)          LONGITUDE: 135° 26.8' W (-135.44700)


The bench mark is a disk set in the concrete deck along the east side near the
SW corner of a 30 m x 61 m x 1 m (100 ft x 200 ft x 4 ft) concrete fuel pen,
directly across from a fence gate, and 43 m (140 ft) NE of bench mark EXCURSION
INLET SO. END 5 1964.

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

                                                                                
Station ID: 9452437                         PUBLICATION DATE:  06/25/2018
Name:       EXCURSION INLET (SOUTH END)                       
            AK
NOAA Chart: 17316                           Latitude:   58° 25.0' N (  58.41670)
USGS Quad:  JUNEAU (B-5)                    Longitude: 135° 26.8' W (-135.44700)


                            T I D A L   D A T U M S 


Tidal datums at EXCURSION INLET (SOUTH END) based on:

     LENGTH OF SERIES:      30 DAYS
     TIME PERIOD:           May  9 1999 - Jun  7 1999
     TIDAL EPOCH:           2012-2016
     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   =  4.547
     MEAN HIGH WATER                            MHW    =  4.275
     MEAN SEA LEVEL                             MSL    =  2.401
     MEAN TIDE LEVEL                            MTL    =  2.379
     MEAN LOW WATER                             MLW    =  0.482
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     EXCURSION INLET SO. END 5 1964              8.724    4.449
     2437 E 1999                                 8.146    3.871
     2437 F 1999                                 8.109    3.833
     2437 G 1999                                 9.267    4.992
     2437 H 1999                                 9.065    4.790


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

                                                                                
Station ID: 9452437                         PUBLICATION DATE:  06/25/2018
Name:       EXCURSION INLET (SOUTH END)                       
            AK
NOAA Chart: 17316                           Latitude:   58° 25.0' N (  58.41670)
USGS Quad:  JUNEAU (B-5)                    Longitude: 135° 26.8' W (-135.44700)


                             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 9452437 EXCURSION INLET (SOUTH END), AK

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