U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  8

                                                                                
Station ID: 1770000                         PUBLICATION DATE:  09/22/2017
Name:       PAGO PAGO, AMERICAN SAMOA                         
            AMERICAN SAMOA
NOAA Chart: 83484                           Latitude:   14° 16.6' S ( -14.27667)
USGS Quad:  TUTUILA ISLAND                  Longitude: 170° 41.4' W (-170.68944)


To reach the tidal bench marks, from Pago Pago Airport proceed 0.3 km (0.2 mi)
from the parking lot and turn right onto the Airport Road (look for the U.S.
Army Reserve Building at intersection) and proceed 2.1 km (1.3 mi) on Airport
Road to the T intersection where the Airport and Main Roads intersect, turn
right onto the Main Road and proceed 10.6 km (6.6 mi), take a right at the first
intersection past the Fagatogo Shopping complex which will be on your right. 
Proceed one block and take a left onto the waterfront street, then proceed west
for 1/2 block and on your right will be the two storied, constructed of gray
stone with a cinder block wall, Department of Marine & Wildlife Resource (DMWR)
building, located across the street and north of the public outdoor market and
bus stop.  The bench marks were located in the vicinity all along the harbor. 
The Tide Gauge is located in a storage closet (with outside entrance) in the NE
corner of the DMWR building on the first level.


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


                 PRIMARY BENCH MARK STAMPING:  0000 W 2003
                         DESIGNATION:          177 0000 W

MONUMENTATION:           Tidal Station disk                    VM#:        17047
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete retaining wall               OPUS PID:        
LATITUDE:   14° 16.7' S ( -14.27839)          LONGITUDE: 170° 41.2' W (-170.68747)


The primary bench mark is set flush in the top of a concrete retaining wall
located on top of a pumice bedrock located in the SW corner of the post office
parking lot, 13.65 m (44.8 ft) SE of the SE corner of the post office, 2.25 m
(7.4 ft) east of a 1.84 m x 1.50 m (6.0 ft x 4.9 ft) gray voltage box, 1.05 m
(3.4 ft) south of the parking lot apron, 0.62 m (2.0 ft) east of a chain link
fence, and 1.50 m (4.9 ft) above the parking lot apron.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  8

                                                                                
Station ID: 1770000                         PUBLICATION DATE:  09/22/2017
Name:       PAGO PAGO, AMERICAN SAMOA                         
            AMERICAN SAMOA
NOAA Chart: 83484                           Latitude:   14° 16.6' S ( -14.27667)
USGS Quad:  TUTUILA ISLAND                  Longitude: 170° 41.4' W (-170.68944)


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


                         BENCH MARK STAMPING:  0000 P 1987
                         DESIGNATION:          177 0000 P

MONUMENTATION:           Tidal Station disk                    VM#:         1480
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DE8784
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   14° 16.6' S ( -14.27711)          LONGITUDE: 170° 41.2' W (-170.68658)


The bench mark is a disk set in the SE corner of the concrete foundation of the
Department of Port Administration Building, 35.97 m (118.0 ft) north of the west
end of the gate fence post, 14.39 m (47.2 ft) east of the stairway up to the
Port Director's office, 6.89 m (22.6 ft) from the southern-most corner of a
metal shed on the east side of the building, 0.18 m (0.6 ft) SE of the SE corner
of the building, and 0.15 m (0.5 ft) west from the east edge of the concrete
foundation.



                         BENCH MARK STAMPING:  0000 Q 1991
                         DESIGNATION:          177 0000 Q

MONUMENTATION:           Tidal Station disk                    VM#:         1481
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DE8783
SETTING CLASSIFICATION:  Bedrock outcrop                       OPUS PID:        
LATITUDE:   14° 16.7' S ( -14.27797)          LONGITUDE: 170° 41.7' W (-170.69464)


The bench mark is a disk set in a bedrock outcropping at the northern base of
the mountain behind Wesley Book Shop, 31.70 m (104.0 ft) south of the main road,
11.95 m (39.2 ft) NE to a green phone utility box, 9.69 m (31.8 ft) SW to the
western-most pillar supporting a stairway, 9.24 m (30.3 ft) south of the SE
corner of Wesley Book Shop, 3.87 m (12.7 ft) south of the south side of a 1 m (2
ft) high cement wall, 0.09 m (0.3 ft) north of a vertical rock wall, and 0.91 m
(3.0 ft) above ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  8

                                                                                
Station ID: 1770000                         PUBLICATION DATE:  09/22/2017
Name:       PAGO PAGO, AMERICAN SAMOA                         
            AMERICAN SAMOA
NOAA Chart: 83484                           Latitude:   14° 16.6' S ( -14.27667)
USGS Quad:  TUTUILA ISLAND                  Longitude: 170° 41.4' W (-170.68944)


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


                         BENCH MARK STAMPING:  0000 T 1993
                         DESIGNATION:          177 0000 T TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        12713
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DE8790
SETTING CLASSIFICATION:  Concrete bench                        OPUS PID:        
LATITUDE:   14° 16.7' S ( -14.27786)          LONGITUDE: 170° 41.3' W (-170.68811)


The bench mark is set flush at the north side of the outside of a circular
concrete public bench that has a radius of 7.27 m (23.9 ft), located on the
north side of the main road directly across the street from the U.S. Post Office
and west of the Jean P. Haydon museum, 11.52 m (37.8 ft) NW of a red fire
hydrant, 0.34 m (1.1 ft) north of the south end of the bench, and 0.46 m (1.5
ft) above ground level.



                         BENCH MARK STAMPING:  0000 U 1993 AS 28
                         DESIGNATION:          177 0000 U TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        12714
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DE8788
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   14° 16.6' S ( -14.27658)          LONGITUDE: 170° 41.6' W (-170.69281)


The bench mark is a disk set on top of a concrete seawall, in the corner where
the northward facing seawall and westward facing seawall meet, 0.12 km (0.07 mi)
west of bench mark 177 0000 R along the north side of the road that runs along
the waterfront, 13.55 m (44.5 ft) NW of the NW corner of the Phil & Sons
Construction Company, Inc., office building, 5.49 m (18.0 ft) north of the
centerline of the road which runs along the waterfront, 0.93 m (3.1 ft) south of
the east entrance to the floating dock marina, 0.34 m (1.1 ft) east of cyclone
fence which surrounds the floating dock marina, and 0.15 m (0.5 ft) above street
level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  8

                                                                                
Station ID: 1770000                         PUBLICATION DATE:  09/22/2017
Name:       PAGO PAGO, AMERICAN SAMOA                         
            AMERICAN SAMOA
NOAA Chart: 83484                           Latitude:   14° 16.6' S ( -14.27667)
USGS Quad:  TUTUILA ISLAND                  Longitude: 170° 41.4' W (-170.68944)


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


                         BENCH MARK STAMPING:  0000 V 1993
                         DESIGNATION:          177 0000 V TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        12715
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DE8791
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   14° 16.5' S ( -14.27561)          LONGITUDE: 170° 41.6' W (-170.69281)


The bench mark is set flush in a concrete seawall south of a breakwater for
yacht moorage and north of the Langkilde Service Station, on the north side of
the street running along the waterfront, 0.17 km (0.11 mi) west of bench mark
177 0000 U, 14.20 m (46.6 ft) NNE of the NE-most filling pump of the service
station, 0.91 m (3.0 ft) north of a "ONE-WAY" street sign, 0.76 m (2.5 ft) south
of the seawall's water edge, 0.25 m (0.8 ft) south of the cyclone fence running
along the waterfront, and 0.2 m (0.7 ft) above stret level.



                         BENCH MARK STAMPING:  0000 X 2003
                         DESIGNATION:          177 0000 X

MONUMENTATION:           Tidal Station disk                    VM#:        17048
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Manhole cover                         OPUS PID:        
LATITUDE:   14° 16.7' S ( -14.27828)          LONGITUDE: 170° 41.2' W (-170.68747)


The bench mark is set flush in the base of a concrete manhole cover vault which
measures 0.8 m (2.6 ft) diameter manhole with "telephone" stamped across the
center of the manhole cover, in front of the entrance to Samoa Imports, Inc.,
11.53 m (37.8 ft) NW of the NE corner of the Samoa Sports Shop, 6.89 m (22.6 ft)
north of  the center of the west entrance door to Samoan Sports Shop, 2.76 m
(9.1 ft) south of the curb of the sidewalk which runs parallel to the street,
0.92 m (3.0 ft) NE from the NW corner of the step leading to the Samoa Sports
Shop, 0.55 m (1.8 ft) SW of the center of the manhole cover, and 0.23 m (0.8 ft)
above the grade of the sidewalk.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  8

                                                                                
Station ID: 1770000                         PUBLICATION DATE:  09/22/2017
Name:       PAGO PAGO, AMERICAN SAMOA                         
            AMERICAN SAMOA
NOAA Chart: 83484                           Latitude:   14° 16.6' S ( -14.27667)
USGS Quad:  TUTUILA ISLAND                  Longitude: 170° 41.4' W (-170.68944)


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


                         BENCH MARK STAMPING:  0000 Y 2016
                         DESIGNATION:          177 0000 Y

MONUMENTATION:           Tidal Station disk                    VM#:        22159
AGENCY:                  National Ocean Service                IDB PID#:        
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   14° 16.6' S ( -14.27700)          LONGITUDE: 170° 41.4' W (-170.69031)


The bench mark is a disk set flush in a concrete pad north of the unnamed road
along the bay front which parallels the bay and is north of Route 1, between the
boat ramp and stream, 19.3m NW of a red fire hydrant located at the SE corner of
the intersection of an unnamed road (running SW-NE between Fagatogo square and
Fagatogo market) and the road along the bay front, 8.9m north of the centerline
of the bay front road, 6.7m west of the east edge of the concrete pad, 4m south
of the NW corner of the concrete pad, 3.4 m north of the center of the elevated
red sewer pipe, and 1.9 m east of the concrete wall on the east side of the
stream.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  8

                                                                                
Station ID: 1770000                         PUBLICATION DATE:  09/22/2017
Name:       PAGO PAGO, AMERICAN SAMOA                         
            AMERICAN SAMOA
NOAA Chart: 83484                           Latitude:   14° 16.6' S ( -14.27667)
USGS Quad:  TUTUILA ISLAND                  Longitude: 170° 41.4' W (-170.68944)


                            T I D A L   D A T U M S 


Tidal datums at PAGO PAGO, AMERICAN SAMOA based on:

     LENGTH OF SERIES:      5 YEARS
     TIME PERIOD:           October 2011 - September 2016
     TIDAL EPOCH:           0000-0000
     CONTROL TIDE STATION:   


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

     HIGHEST OBSERVED WATER LEVEL (12/14/2016)         =  1.206
     MEAN HIGHER HIGH WATER                     MHHW   =  0.844
     MEAN HIGH WATER                            MHW    =  0.803
     MEAN TIDE LEVEL                            MTL    =  0.410
     MEAN SEA LEVEL                             MSL    =  0.410
     MEAN LOW WATER                             MLW    =  0.017
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (05/06/2016)         = -0.306



Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     0000 W 2003                                 3.365    2.562
     0000 P 1987                                 2.535    1.732
     0000 Q 1991                                 4.592    3.789
     0000 T 1993                                 2.616    1.813
     0000 U 1993 AS 28                           1.883    1.080
     0000 V 1993                                 1.742    0.939
     0000 X 2003                                 3.584    2.781
     0000 Y 2016                                 2.015    1.212


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  8

                                                                                
Station ID: 1770000                         PUBLICATION DATE:  09/22/2017
Name:       PAGO PAGO, AMERICAN SAMOA                         
            AMERICAN SAMOA
NOAA Chart: 83484                           Latitude:   14° 16.6' S ( -14.27667)
USGS Quad:  TUTUILA ISLAND                  Longitude: 170° 41.4' W (-170.68944)


Foot Notes:

This area experienced an earth quake & tsunami Sep. 29, 2009 which shifted water
levels relative to land and caused the '83-'01 datums to be no longer
representative of post-quake observations. New datums are being computed to
include only data after the quake-related shift. The land shift occurred over
the full year of 2010, so datums are computed using only data from 2011 to
present. There are no nearby stations to use as a control for computing '83-'01
National Tidal Datum Epoch (NTDE) equivalent datums, therefore these datums are
NOT on the current NTDE.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  8

                                                                                
Station ID: 1770000                         PUBLICATION DATE:  09/22/2017
Name:       PAGO PAGO, AMERICAN SAMOA                         
            AMERICAN SAMOA
NOAA Chart: 83484                           Latitude:   14° 16.6' S ( -14.27667)
USGS Quad:  TUTUILA ISLAND                  Longitude: 170° 41.4' W (-170.68944)


                             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 defined island datum (ASVD02).  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.

American Samoa Vertical Datum of 2002 (ASVD02) is a fixed datum derived from
a simultaneous, least squares, minimum constraint adjustment of leveling
observations.  Local mean sea level relative to the 1983-2001 National Tidal
Datum Epoch observed at tide station 1770000 at Pago Pago Harbor, American
Samoa was held fixed as the single initial constraint.  ASVD02 replaces all
previous height system as the national standard geodetic reference for heights
on Tutuila Island, American Samoa.  Bench mark elevations relative to ASVD02
are available from NGS through the World Wide Web at 
National Geodetic Survey.

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 ASVD02 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have ASVD02 elevations.
The ASVD02 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, ASVD02 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from ASVD02 elevations listed for
each bench mark in the NGS database.