Superseded Bench Mark Sheet for 1890000, Wake Island, Pacific Ocean

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  7

                                                   PUBLICATION DATE:  10/12/2001
Station ID: 1890000                                SUPERCEDED DATE:   04/21/2003
Name:       WAKE ISLAND, PACIFIC OCEAN                        
NOAA Chart: 81664                                  Latitude:         19° 17.4' N
USGS Quad:  NONE                                   Longitude:       166° 37.1' E


To reach the tidal bench marks from the National Weather Service (NWS) office at
the U.S. Army Base, exit the NWS parking lot, turn right onto Wake Highway, and
proceed around the runway until the small boat channel is reached.  The tide
house is located at Building # 1711, a light green concrete block building
located near the northern-most corner of the south seawall along the boat
channel.  The tidal bench marks are located in the vicinity.


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


                 PRIMARY BENCH MARK STAMPING:  NO 12 1961
                         DESIGNATION:          189 0000 TIDAL 12

MONUMENTATION:           Tidal Station disk                        VM#:      129
AGENCY:                  US Coast & Geodetic Survey (USC&GS)       PID#:  TW0169
SETTING CLASSIFICATION:  Concrete apron


The primary bench mark is a disk set in the concrete apron at the easterly
corner of the Boathouse (Building # 1705), 3.66 m (12.0 ft) SW of the boat basin
wharf face, and 0.30 m (1.0 ft) NW of the east edge of concrete apron, and 0.30
m (1.0 ft) SE of easterly corner of building.



                         BENCH MARK STAMPING:  NO 13 1965
                         DESIGNATION:          189 0000 TIDAL 13

MONUMENTATION:           Tidal Station disk                        VM#:      130
AGENCY:                  US Coast & Geodetic Survey (USC&GS)       PID:         
SETTING CLASSIFICATION:  Concrete apron


The bench mark is a disk set in the concrete apron at the westerly corner of the
Boathouse (Building # 1705), about 14 m (45 ft) SW of the wharf face, 2.99 m
(9.8 ft) NW of the center of the NW-most set of double doors on the west side of
Boathouse, and 0.2 m (0.5 ft) SW of the westerly corner of the Boathouse.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                   PUBLICATION DATE:  10/12/2001
Station ID: 1890000                                SUPERCEDED DATE:   04/21/2003
Name:       WAKE ISLAND, PACIFIC OCEAN                        
NOAA Chart: 81664                                  Latitude:         19° 17.4' N
USGS Quad:  NONE                                   Longitude:       166° 37.1' E


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


                         BENCH MARK STAMPING:  TIDAL BM 0000 H 1978
                         DESIGNATION:          189 0000 TIDAL BM H

MONUMENTATION:           Tidal Station disk                        VM#:      134
AGENCY:                  National Ocean Survey (NOS)               PID:         
SETTING CLASSIFICATION:  Concrete foundation


The bench mark is a disk set in a concrete bollard stay located along the south
seawall of the small boat basin, 75 m (246 ft) NW of bench mark NO 12 1961, 70 m
(230 ft) SE of the NW corner of the seawall, 1.1 m (3.5 ft) SW of the seawall,
and 0.24 m (0.8 ft) NW of a large double bollard.



                         BENCH MARK STAMPING:  TIDAL BM 0000 J 1978
                         DESIGNATION:          189 0000 TIDAL BM J

MONUMENTATION:           Tidal Station disk                        VM#:      135
AGENCY:                  National Ocean Survey (NOS)               PID:         
SETTING CLASSIFICATION:  Concrete slab


The bench mark is a disk set in an octagonal concrete pad about 90 m (295 ft)
ESE of bench mark 0000 L 1980, 20 m (66 feet) east of the road centerline, 14.08
m (46.2 ft) north of the north corner of the concrete foundation supporting two
green transformer boxes, 2.32 m (7.6 ft) north of an orange witness post, 0.3 m
(1 ft) SE of the NW corner of the octagon, and 0.46 m (1.5 ft) above grade.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                   PUBLICATION DATE:  10/12/2001
Station ID: 1890000                                SUPERCEDED DATE:   04/21/2003
Name:       WAKE ISLAND, PACIFIC OCEAN                        
NOAA Chart: 81664                                  Latitude:         19° 17.4' N
USGS Quad:  NONE                                   Longitude:       166° 37.1' E


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


                         BENCH MARK STAMPING:  TIDAL BM 0000 K 1978
                         DESIGNATION:          189 0000 TIDAL BM K

MONUMENTATION:           Tidal Station disk                        VM#:      136
AGENCY:                  National Ocean Survey (NOS)               PID:         
SETTING CLASSIFICATION:  Concrete seawall


The bench mark is a disk set in the south concrete seawall bordering the boat
basin entrance channel, 16 m (54 ft) WSW of the most NE channel seawall corner,
8 m (27 ft) NE of the SW edge of the concrete seawall, and 0.3 m (1 ft) south of
the north edge of the seawall.



                         BENCH MARK STAMPING:  0000 L 1980
                         DESIGNATION:          189 0000 L

MONUMENTATION:           Tidal Station disk                        VM#:      137
AGENCY:                  National Ocean Survey (NOS)               PID:         
SETTING CLASSIFICATION:  Concrete slab


The bench mark is a disk set in a 12 m x 32 m (41 ft x 105 ft) abandoned
concrete pad overgrown with vines, about 90 m (295 ft) WNW of bench mark TIDAL
BM 0000 J 1978, 31.24 m (102.5 ft) NE of the centerline of the main road to the
boathouse, 29.41 m (96.5 ft) north of the north corner of an orange underground
cable station cover, 10.18 m (33.4 ft) south of the centerline of a dirt road
adjacent to the pad, 6.83 m (22.4 ft) east of the north-most of two tall grey
3-inch diameter PVC posts, 0.61 m (2.0 ft) south of the NW edge of the pad, and
0.46 m (1.5 ft) east of the west edge of the pad.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                   PUBLICATION DATE:  10/12/2001
Station ID: 1890000                                SUPERCEDED DATE:   04/21/2003
Name:       WAKE ISLAND, PACIFIC OCEAN                        
NOAA Chart: 81664                                  Latitude:         19° 17.4' N
USGS Quad:  NONE                                   Longitude:       166° 37.1' E


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


                         BENCH MARK STAMPING:  0000 N 1989
                         DESIGNATION:          189 0000 N

MONUMENTATION:           Tidal Station disk                        VM#:      139
AGENCY:                  National Ocean Survey (NOS)               PID:         
SETTING CLASSIFICATION:  Concrete foundation


The bench mark is a disk set in the foundation of Building # 1706 in the north
doorway, located south of the boat basin, 4.75 m (15.6 ft) east of the west side
of doorway, 0.13 m (0.45 ft) west of the east side of the doorway, and 0.09 m
(0.30 ft) south of north edge of the foundation.



                         BENCH MARK STAMPING:  0000 P 1992
                         DESIGNATION:          189 0000 P

MONUMENTATION:           Tidal Station disk                        VM#:     6425
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete seawall


The bench mark is a disk set in the east end of a concrete seawall, about 100 m
(328 ft) south of Building #1715, 64 m (210 ft) south of middle of road leading
to east jetty, 34 m (110 ft) north of the high water line, 3.35 m (11.0 ft)
north of the east elbow of seawall, and 0.76 m (2.5 ft) above grade.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                   PUBLICATION DATE:  10/12/2001
Station ID: 1890000                                SUPERCEDED DATE:   04/21/2003
Name:       WAKE ISLAND, PACIFIC OCEAN                        
NOAA Chart: 81664                                  Latitude:         19° 17.4' N
USGS Quad:  NONE                                   Longitude:       166° 37.1' E


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


                         BENCH MARK STAMPING:  0000 R 1994
                         DESIGNATION:          189 0000 R

MONUMENTATION:           Tidal Station disk                        VM#:     6446
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete foundation


The bench mark is a disk set flush in top a 4 m x 2 m (14 ft x 6 ft) concrete
foundation about 82 m (270 ft) south of Building # 1716, 43 m (142 ft) SE of the
SW corner of a WWII concrete pillbox, 29 m (96 ft) SW of a large circular
concrete fuel tank foundaiton which no longer has a tank on it, 23 m (75 ft) NE
of the center of paved road leading to east jetty, 0.76 m (2.5 ft) SW of the NE
side of the foundation, 0.76 m (2.5 ft) SE of the NE side of the foundation, and
0.3 m (1 ft) above grade.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                   PUBLICATION DATE:  10/12/2001
Station ID: 1890000                                SUPERCEDED DATE:   04/21/2003
Name:       WAKE ISLAND, PACIFIC OCEAN                        
NOAA Chart: 81664                                  Latitude:         19° 17.4' N
USGS Quad:  NONE                                   Longitude:       166° 37.1' E


                            T I D A L   D A T U M S 


Tidal datums at WAKE ISLAND, PACIFIC OCEAN based on:

     LENGTH OF SERIES:      17 YEARS
     TIME PERIOD:           January 1960 - December 1977
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:   


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

     HIGHEST OBSERVED WATER LEVEL (10/28/1992)         =  1.759
     MEAN HIGHER HIGH WATER                     MHHW   =  0.732
     MEAN HIGH WATER                            MHW    =  0.668
     MEAN SEA LEVEL                             MSL    =  0.357
     MEAN TIDE LEVEL                            MTL    =  0.354
     MEAN LOW WATER                             MLW    =  0.037
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (04/14/1968)         = -0.591



Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 12 1961                                  3.152    2.485
     NO 13 1965                                  3.241    2.573
     TIDAL BM 0000 H 1978                        3.000    2.333
     TIDAL BM 0000 J 1978                        4.765    4.097
     TIDAL BM 0000 K 1978                        3.485    2.818
     0000 L 1980                                 4.151    3.483
     0000 N 1989                                 3.942    3.274
     0000 P 1992                                 4.029    3.362
     0000 R 1994                                 3.491    2.824


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  7

                                                   PUBLICATION DATE:  10/12/2001
Station ID: 1890000                                SUPERCEDED DATE:   04/21/2003
Name:       WAKE ISLAND, PACIFIC OCEAN                        
NOAA Chart: 81664                                  Latitude:         19° 17.4' N
USGS Quad:  NONE                                   Longitude:       166° 37.1' E


                             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 any other fixed island datum.

This tide station location has a local island datum.  Island datums
are specific fixed geodetic datums whose elevation relationship 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.

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