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Bench Mark Sheet for 9455606, Anchor Point, Cook Inlet 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 9455606                         PUBLICATION DATE:  04/09/2018
Name:       ANCHOR POINT                                      
            AK
NOAA Chart: 16645                           Latitude:   59° 46.3' N (  59.77197)
USGS Quad:  SELDOVIA (D-5)                  Longitude: 151° 52.0' W (-151.86703)


To reach the bench marks from the Anchor Point Post Office, proceed south on the
Sterling Hwy for 0.2 km (0.1 mi) to the Old Sterling Hwy, then SW on the Old
Sterling Hwy for 0.6 km (0.4 mi) crossing the Anchor River Bridge to the
intersection with Anchor Point Road, then west on Anchor Point Rd. for 2.0 km
(1.2 mi) to its termination at the parking lot for the public boat launch, then
south along the beach to 0.6 km (0.4 mi) to the USCG day marker. The bench marks
are on top of the bluff near the day marker. The tide house was located adjacent
to the chain link fence.


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


                 PRIMARY BENCH MARK STAMPING:  BM 4 1973
                         DESIGNATION:          945 5606 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:         9551
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID:        
LATITUDE:   59° 46.2' N (  59.76919)          LONGITUDE: 151° 52.0' W (-151.86703)


The primary bench mark is a disk set flush in a buried concrete fence post
footing, just outside of the NW corner of the chain link fence surrounding the
USCG navigation light, 6.09 m (20.0 ft) WNW of 945 5606 TIDAL 5, 4.90 m (16.1
ft) ENE of the top edge of the beach bluff, 2.90 m (9.5 ft) ESE of bench mark
945 5606 E, 0.55 m (1.8 ft) NW of NW most corner of the chain link fence and
0.05 m (0.2 ft) below grade.

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

                                                                                
Station ID: 9455606                         PUBLICATION DATE:  04/09/2018
Name:       ANCHOR POINT                                      
            AK
NOAA Chart: 16645                           Latitude:   59° 46.3' N (  59.77197)
USGS Quad:  SELDOVIA (D-5)                  Longitude: 151° 52.0' W (-151.86703)


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


                         BENCH MARK STAMPING:  BM 6 1973
                         DESIGNATION:          945 5606 TIDAL 6

MONUMENTATION:           Tidal Station disk                    VM#:         9553
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID:        
LATITUDE:   59° 46.1' N (  59.76897)          LONGITUDE: 151° 52.4' W (-151.87333)


The bench mark is set in a 1.06 m x 1.06 m (3.5 ft x 3.5 ft) concrete footing of
the old USCG light in the trees SSE of the new USCG light, 33.17 m (108.8 ft) SE
of bench mark 945 5606 TIDAL 5, 19.91 m (65.3 ft) SE of the eastern most corner
fence post of the chain link fence surrounding the USCG light, 17.10 m (56.1 ft)
ESE of the top edge of the beach bluff, 7.22 m (23.7 ft) ESE of bench mark 945
5606 TIDAL 7, 4.76 m (15.6 ft) NNW of bench mark 945 5606 TIDAL 8, and 0.03 m
(0.1 ft) above the concrete.



                         BENCH MARK STAMPING:  BM 7 1973
                         DESIGNATION:          945 5606 TIDAL 7

MONUMENTATION:           Tidal Station disk                    VM#:         9554
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID:        
LATITUDE:   59° 46.1' N (  59.76897)          LONGITUDE: 151° 52.0' W (-151.86686)


The bench mark is set in a 1.06 m x 1.06 m (3.5 ft x 3.5 ft) concrete footing of
the old USCG light in the trees SSE of the new USCG light, 17.89 m (58.7 ft) SSE
of the gate of the chain link fence surrounding the new USCG light, 10.10 m
(33.1 ft) ENE of the top edge of the beach bluff, 9.02 m (29.6 ft) west of bench
mark 945 5606 TIDAL 8, 7.22 m (23.7 ft) WNW of bench mark 945 5606 TIDAL 6, 0.18
m (0.6 ft) east of the western most edge of the concrete footing, and 0.02 m
(0.1 ft) above the concrete.

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

                                                                                
Station ID: 9455606                         PUBLICATION DATE:  04/09/2018
Name:       ANCHOR POINT                                      
            AK
NOAA Chart: 16645                           Latitude:   59° 46.3' N (  59.77197)
USGS Quad:  SELDOVIA (D-5)                  Longitude: 151° 52.0' W (-151.86703)


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


                         BENCH MARK STAMPING:  BM 8 1973
                         DESIGNATION:          945 5606 TIDAL 8

MONUMENTATION:           Tidal Station disk                    VM#:         9555
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID:        
LATITUDE:   59° 46.1' N (  59.76892)          LONGITUDE: 151° 52.0' W (-151.86675)


The bench mark is set in a 1.06 m x 1.06 m (3.5 ft x 3.5 ft) concrete footing of
the old USCG light in the trees SSE of the new USCG light, 26.09 m (85.6 ft) SSE
of the gate of the chain link fence surrounding the new USCG light, 17.30 m
(56.8 ft) ENE of the top edge of the beach bluff, 9.02 m (29.6 ft) east of bench
mark 945 5606 TIDAL 7, 0.71 m (2.3 ft) east of the western most edge of concrete
and 0.02 m (0.1 ft) above the concrete.



                         BENCH MARK STAMPING:  5606 E 1977
                         DESIGNATION:          945 5606 E

MONUMENTATION:           Tidal Station disk                    VM#:         9556
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID#: BBBK76
LATITUDE:   59° 46.2' N (  59.76919)          LONGITUDE: 151° 52.0' W (-151.86708)


The bench mark is set flush in a buried 1.06 m x 1.06 m (3.5 ft x 3.5 ft)
concrete footing of the old USCG light NW of the new USCG light, 8.79 m (28.8
ft) WNW of bench mark 945 5606 TIDAL 5, 3.26 m (10.7 ft) WNW of the western most
corner of the chain link fence surrounding the USCG light, 2.90 m (9.5 ft) WNW
of bench mark 945 5606 TIDAL 4, 2.30 m (7.5 ft) ENE of the top edge of the beach
bluff.

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

                                                                                
Station ID: 9455606                         PUBLICATION DATE:  04/09/2018
Name:       ANCHOR POINT                                      
            AK
NOAA Chart: 16645                           Latitude:   59° 46.3' N (  59.77197)
USGS Quad:  SELDOVIA (D-5)                  Longitude: 151° 52.0' W (-151.86703)


                            T I D A L   D A T U M S 


Tidal datums at ANCHOR POINT based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           October 2009 - October 2009
     TIDAL EPOCH:           2012-2016
     CONTROL TIDE STATION:  9455500 SELDOVIA, COOK INLET


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

     MEAN HIGHER HIGH WATER                     MHHW   =  5.604
     MEAN HIGH WATER                            MHW    =  5.366
     MEAN SEA LEVEL                             MSL    =  2.960
     MEAN TIDE LEVEL                            MTL    =  2.949
     MEAN LOW WATER                             MLW    =  0.532
     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 4 1973                                  12.813    7.447
     BM 6 1973                                  12.461    7.095
     BM 7 1973                                  12.382    7.016
     BM 8 1973                                  12.412    7.046
     5606 E 1977                                12.734    7.368


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

                                                                                
Station ID: 9455606                         PUBLICATION DATE:  04/09/2018
Name:       ANCHOR POINT                                      
            AK
NOAA Chart: 16645                           Latitude:   59° 46.3' N (  59.77197)
USGS Quad:  SELDOVIA (D-5)                  Longitude: 151° 52.0' W (-151.86703)


                             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 9455606 Anchor Point, Cook Inlet, AK

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