U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 1770000 PUBLICATION DATE: 12/31/2020
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: 12/31/2020
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: NO 10 1963
DESIGNATION: 177 0000 TIDAL 10
MONUMENTATION: Tidal Station disk VM#: 94
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: DE8785
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID#: DE8785
LATITUDE: 14° 16.6' S ( -14.27678) LONGITUDE: 170° 41.2' W (-170.68747)
The bench mark is a disk set flush in top of a 0.37 m (1.2 ft) 14 inch wide
NW-SE concrete bulkhead located inside the Department of Port Administration
compound, 21.64 m (71.0 ft) south of the NW corner of the wharf, 13.72 m (45.0
ft) west of the NW corner of a reinforced concrete warehouse, 1.62 m (5.3 ft)
NNE from a red fire hydrant, and 0.52 m (1.7 ft) north of the Northeast hydrant
barrier pole which is painted yellow.
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.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 1770000 PUBLICATION DATE: 12/31/2020
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 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 ( -14.27769) LONGITUDE: 170° 41.2' W (-170.68603)
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.
BENCH MARK STAMPING: 0000 R 1993
DESIGNATION: 177 0000 R TIDAL
MONUMENTATION: Tidal Station disk VM#: 12712
AGENCY: National Ocean Service (NOS) IDB PID#: DE8787
SETTING CLASSIFICATION: Concrete stairway OPUS PID:
LATITUDE: 14° 16.6' S ( -14.27681) LONGITUDE: 170° 41.5' W (-170.69114)
The bench mark is set flush in the concrete stairway in the SE corner of the
Department of Marine & Wildlife Resource building, 8.02 m (26.3 ft) NW of the SE
corner of the cinder block fence wall which surrounds the building, and 4.27 m
(14.0 ft) due north of the south wall, and 0.36 m (1.2 ft) above ground level on
the second step adjacent to the building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 1770000 PUBLICATION DATE: 12/31/2020
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° 41.5' W (-170.69167)
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 5 of 8
Station ID: 1770000 PUBLICATION DATE: 12/31/2020
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#: DE8791
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#: DR4148
SETTING CLASSIFICATION: Manhole cover OPUS PID:
LATITUDE: 14° 16.6' S ( -14.27750) LONGITUDE: 170° 41.1' W (-170.68581)
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 6 of 8
Station ID: 1770000 PUBLICATION DATE: 12/31/2020
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 7 of 8
Station ID: 1770000 PUBLICATION DATE: 12/31/2020
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: 8 YEARS
TIME PERIOD: October 2011 - September 2019
TIDAL EPOCH: 0000-0000
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (02/19/2019) = 1.231
MEAN HIGHER HIGH WATER MHHW = 0.848
MEAN HIGH WATER MHW = 0.807
MEAN SEA LEVEL MSL = 0.413
MEAN TIDE LEVEL MTL = 0.412
MEAN LOW WATER MLW = 0.018
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (05/06/2016) = -0.339
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0000 W 2003 3.332 2.525
NO 10 1963 2.225 1.418
0000 P 1987 2.503 1.696
0000 Q 1991 4.562 3.755
0000 R 1993 2.196 1.389
0000 T 1993 2.580 1.773
0000 U 1993 AS 28 1.851 1.044
0000 V 1993 1.711 0.904
0000 X 2003 3.552 2.745
0000 Y 2016 1.980 1.173
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 1770000 PUBLICATION DATE: 12/31/2020
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.