U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 1619000 PUBLICATION DATE: 04/21/2003
Name: JOHNSTON ATOLL, PACIFIC OCEAN
NOAA Chart: 83637 Latitude: 16° 44.3' N ( 16.73830)
USGS Quad: NONE Longitude: 169° 31.8' W (-169.53000)
To reach the tidal bench marks, from the Johnston Island airport proceed east on
the perimeter road around the end of the runway for approximately 0.8 km (0.5
mi), make a right turn into the small boat basin. The bench marks and tide gage
were located in the vicinity of the basin. The tide house is located on the NW
corner of the pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 13 1955
DESIGNATION: 161 9000 NO 13
MONUMENTATION: Tidal Station disk VM#: 87
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Concrete bulkhead cap OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The primary bench mark is a disk set in a concrete bulkhead cap at the inshore
end of the Small Boat Pier, 17.53 m (57.5 ft) north of the NW corner of Building
#100, 7.92 m (26.0 ft) NW of fire hydrant #14, 4.42 m (14.5 ft) west of the
eastern side of the cement bulkhead of the small boat pier, and flush with
ground.
BENCH MARK STAMPING: NO 12 1955
DESIGNATION: 161 9000 NO 12
MONUMENTATION: Tidal Station disk VM#: 60
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The bench mark is a disk set in the top of a concrete seawall on the west side
of the Small Boat Pier, 17.07 m (56.0 ft) south of the south edge of the small
concrete pier where the tide house is located, 3 m (10 ft) NW of bollard near
galvanized barrier, 2 m (6 ft) north of galvanized barrier protecting fuel line
painted yellow, and 0.30 m (1.0 ft) south of the south edge of a northern-most
wooden ramp leading from the Navy pier to a wooden boat pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 1619000 PUBLICATION DATE: 04/21/2003
Name: JOHNSTON ATOLL, PACIFIC OCEAN
NOAA Chart: 83637 Latitude: 16° 44.3' N ( 16.73830)
USGS Quad: NONE Longitude: 169° 31.8' W (-169.53000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 14
DESIGNATION: 161 9000 NO 14
ALIAS: USE 14
MONUMENTATION: Bench Mark disk VM#: 61
AGENCY: US Army Corps of Engineers (USE) IDB PID#:
SETTING CLASSIFICATION: Concrete bulkhead cap OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The bench mark is a disk set in top of concrete bulkhead cap on the east side of
the Small Boat Pier, 77.72 m (255.0 ft) south of the northeastern corner of the
pier, 59.44 m (195.0 ft) north of the inshore end of the east side of the pier,
5.49 m (18.0 ft) north of a bit, and 0.98 m (3.2 ft) west of the east wooden
face of the Pier.
BENCH MARK STAMPING: NO 28 1964
DESIGNATION: 161 9000 NO 28
MONUMENTATION: Tidal Station disk VM#: 62
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: TW0253
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 16° 44.3' N ( 16.73830) LONGITUDE: 169° 31.6' W (-169.52700)
The bench mark is a disk set in top of the SE corner of the concrete sidewalk
leading into the doorway to the boiler room on the west side of the west wing of
the former Officer's Club (Building #4), 8.23 m (27.0 ft) north of the SW corner
of the wing, 7.32 m (24.0 ft) south of the NW corner of the wing, 0.30 m (1.0
ft) south of the south edge of the doorway, and 0.12 m (0.4 ft) west of east
facing wall of Building #4.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 1619000 PUBLICATION DATE: 04/21/2003
Name: JOHNSTON ATOLL, PACIFIC OCEAN
NOAA Chart: 83637 Latitude: 16° 44.3' N ( 16.73830)
USGS Quad: NONE Longitude: 169° 31.8' W (-169.53000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: MON JOHN
DESIGNATION: 161 9000 MON JOHN
MONUMENTATION: Triangulation Station disk VM#: 66
AGENCY: Unknown IDB PID#: TW0231
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 16° 44.1' N ( 16.73500) LONGITUDE: 169° 31.7' W (-169.52800)
The bench mark is a disk set in a 0.30 m (1.0 ft) diameter concrete hole located
approximately midway between Apartment D and Apartment E, 37.34 m (122.5 ft) NE
of a fire hydrant on Arnold Avenue corner, 23.93 m (78.5 ft) SW of the SE corner
of Building #291, 11.43 m (37.5 ft) west from 1 m (3 ft) diameter electric
manhole cover on south side of Arnold Avenue, 3.05 m (10.0 ft) SE of street
curbing, 0.24 m (0.8 ft) below street level, and protected by a 0.3 m (1 ft)
circular steel cover.
BENCH MARK STAMPING: 9000 L 1979
DESIGNATION: 161 9000 L
MONUMENTATION: Tidal Station disk VM#: 67
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete loading ramp OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The bench mark is a disk set horizontally in the northeastern corner of the
raised concrete loading ramp on the SW side of Building #100, 14.33 m (47.0 ft)
east of the SW corner of the building, 4.05 m (13.3 ft) north of south edge of
raised compressor platform, 0.15 m (0.5 ft) from south facing edge of building,
and 1.07 m (3.5 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 1619000 PUBLICATION DATE: 04/21/2003
Name: JOHNSTON ATOLL, PACIFIC OCEAN
NOAA Chart: 83637 Latitude: 16° 44.3' N ( 16.73830)
USGS Quad: NONE Longitude: 169° 31.8' W (-169.53000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 21 1964
DESIGNATION: 161 9000 NO 21
MONUMENTATION: Tidal Station disk VM#: 88
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: TW0252
SETTING CLASSIFICATION: Concrete wall OPUS PID:
LATITUDE: 16° 44.3' N ( 16.73830) LONGITUDE: 169° 31.6' W (-169.52700)
The bench mark is a disk set in top of a 1 m (2 ft) high concrete foundation
wall, 23.47 m (77.0 ft) east from the NW corner of the west wing of the former
Officer's Club (Building #4), and 1.22 m (4.0 ft) west from west edge of a
doorway on the north side of the wing, and 0.12 m (0.4 ft) north of north facing
wall of building #4.
BENCH MARK STAMPING: 9000 M 1990
DESIGNATION: 161 9000 M
MONUMENTATION: Tidal Station disk VM#: 1487
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Building foundation OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The bench mark is a disk set in the foundation on the south side in the west
corner of the second bay door on the western side of the Painting Building #33,
7.10 m (23.3 ft) east of SW corner of the Building #33, 4.05 m (13.3 ft) of east
side of cargo bay door, 1.91 m (6.25 ft) north of the southern edge of the
concrete pad forming the ramp into the bay, and 0.21 m (0.7 ft) east of the
western edge of the bay door.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 1619000 PUBLICATION DATE: 04/21/2003
Name: JOHNSTON ATOLL, PACIFIC OCEAN
NOAA Chart: 83637 Latitude: 16° 44.3' N ( 16.73830)
USGS Quad: NONE Longitude: 169° 31.8' W (-169.53000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9000 N 1990
DESIGNATION: 161 9000 N
MONUMENTATION: Tidal Station disk VM#: 1488
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Building foundation OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The bench mark is a disk set in the foundation in the eastern-most bay on the
north side of the Vehicle Maintenance Building #40, 3.32 m (10.9 ft) east of the
west side of the cargo bay door, 2.26 m (7.4 ft) south of the end of the
concrete pad serving as an entry into the garage, 1.07 m (3.5 ft) west of the
west side of the entry doorway to the dispatch office, and 0.34 m (1.1 ft) west
of the eastern side of the bay door.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 1619000 PUBLICATION DATE: 04/21/2003
Name: JOHNSTON ATOLL, PACIFIC OCEAN
NOAA Chart: 83637 Latitude: 16° 44.3' N ( 16.73830)
USGS Quad: NONE Longitude: 169° 31.8' W (-169.53000)
T I D A L D A T U M S
Tidal datums at JOHNSTON ATOLL, PACIFIC OCEAN based on:
LENGTH OF SERIES: 19 Years
TIME PERIOD: January 1983 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (01/13/1958) = 1.521
MEAN HIGHER HIGH WATER MHHW = 0.675
MEAN HIGH WATER MHW = 0.600
MEAN SEA LEVEL MSL = 0.321
MEAN TIDE LEVEL MTL = 0.319
MEAN LOW WATER MLW = 0.037
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (03/23/1951) = -0.552
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 13 1955 2.298 1.698
NO 12 1955 2.337 1.737
NO 14 2.304 1.704
NO 28 1964 2.821 2.221
MON JOHN 4.042 3.442
9000 L 1979 3.334 2.734
NO 21 1964 3.239 2.639
9000 M 1990 2.334 1.734
9000 N 1990 2.837 2.237
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 1619000 PUBLICATION DATE: 04/21/2003
Name: JOHNSTON ATOLL, PACIFIC OCEAN
NOAA Chart: 83637 Latitude: 16° 44.3' N ( 16.73830)
USGS Quad: NONE Longitude: 169° 31.8' W (-169.53000)
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. 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/.