U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 1612480 PUBLICATION DATE: 04/21/2003
Name: MOKUOLOE, KANEOHE BAY, OAHU ISLAND
HAWAII
NOAA Chart: 19359 Latitude: 21° 26.2' N
USGS Quad: KANEOHE Longitude: 157° 47.6' W
To reach the tidal bench marks, from the Lunalilo Highway (H-1) take Exit 20A
north onto the Likelike Highway (Route 63), proceed to the Kamehameha Highway
(Route 83) and turn left, proceed to Lilipuna Road and turn right (east).
Proceed 2.1 km (1.3 mi) until an unmarked entrance to the University of Hawaii
Marine Lab Dock is reached. There is a gate across the driveway for which you
will need an access code to open it. Park in the parking lot and take the ferry
over to Coconut Island. The bench marks are located in the vicinity on the
island. The tide station is located on the west side of the island adjacent to
the shark ponds.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1957
DESIGNATION: 161 2480 NO 1
MONUMENTATION: Tidal Station disk VM#: 41
AGENCY: US Coast and Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete wall
The primary bench mark is a disk set in a concrete wall forming part of the west
end of Long Pond (a fish experiment pond), 6 m (20 ft) NE of the east end of a
small concrete arch bridge, 5.57 m (18.25 ft) south of the SW corner of
tidehouse, and at junction of two concrete pond walls.
BENCH MARK STAMPING: NO 2 1957
DESIGNATION: 161 2480 NO 2
MONUMENTATION: Tidal Station disk VM#: 42
AGENCY: US Coast and Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete bulkhead
The bench mark is a disk set at intersection of concrete bulkheads of the sluice
gate on the south side of the west of three smaller fish ponds to the south of
Long Pond, 50 m (165 ft) SE of bench mark NO 1 1957, 23 m (75 ft) east of the SW
corner of the pond area, and 2 m (5 ft) north of the north side of the small
boat basin.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 1612480 PUBLICATION DATE: 04/21/2003
Name: MOKUOLOE, KANEOHE BAY, OAHU ISLAND
HAWAII
NOAA Chart: 19359 Latitude: 21° 26.2' N
USGS Quad: KANEOHE Longitude: 157° 47.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 3 1957
DESIGNATION: 161 2480 NO 3
MONUMENTATION: Tidal Station disk VM#: 43
AGENCY: US Coast and Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete pavement
The bench mark is a disk set in concrete driveway to an old concrete pier near
the SE corner of fish experiment ponds, 16 m (54 ft) NE from the NW corner of
the boathouse, 12 m (41 ft) north of the NE corner of a three phase concrete
block above a ground transformer vault, 12 m (38 ft) west from the north end of
a reinforced concrete offset in the bulkhead wall along the east side of the
island's perimeter road, 9 m (29 ft) west of the centerline of the concrete
island road, and 0.30 m (1.0 ft) north of the south edge of the driveway.
BENCH MARK STAMPING: NO 4 1959
DESIGNATION: 161 2480 NO 4
MONUMENTATION: Tidal Station disk VM#: 44
AGENCY: US Coast and Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete abutments
The bench mark is a disk set in top of an abutment at the NW corner of the west
pond wall of Long Pond, 4.85 m (15.9 ft) north of the NW corner of the
tidehouse, 1.07 m (3.5 ft) south from the north side of the pond, and 0.3 m (1
ft) north of the most northerly opening in the wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 1612480 PUBLICATION DATE: 04/21/2003
Name: MOKUOLOE, KANEOHE BAY, OAHU ISLAND
HAWAII
NOAA Chart: 19359 Latitude: 21° 26.2' N
USGS Quad: KANEOHE Longitude: 157° 47.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 5 1967
DESIGNATION: 161 2480 NO 5
MONUMENTATION: Tidal Station disk VM#: 45
AGENCY: US Coast and Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete filled metal bollard
The bench mark is a disk set in top of a concrete filled 8-inch pipe bollard at
the east end of the small boat basin near the Marine Railway, 17 m (57 ft) south
from the south roof edge of the boat shed, 15.70 m (51.5 ft) north of the NW
corner of the workshop building, 0.3 m (1 ft) east of the edge of the boat basin
bulkhead, and 0.30 m (1.0 ft) above ground.
BENCH MARK STAMPING: NO 6 1967
DESIGNATION: 161 2480 NO 6
MONUMENTATION: Tidal Station disk VM#: 46
AGENCY: US Coast and Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete curb
The bench mark is a disk set in top of concrete curb at the SE corner of an old
building foundation which is near the SE corner of the small boat basin, 10.58 m
(34.7 ft) east of the east rail of the marine railway, 5 m (18 ft) west of the
center of the dirt road around the island, 2.13 m (7.0 ft) NE of the NE corner
the smaller of two transformer vaults, and 0.30 m (1.0 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 1612480 PUBLICATION DATE: 04/21/2003
Name: MOKUOLOE, KANEOHE BAY, OAHU ISLAND
HAWAII
NOAA Chart: 19359 Latitude: 21° 26.2' N
USGS Quad: KANEOHE Longitude: 157° 47.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 8 1968
DESIGNATION: 161 2480 NO 8
MONUMENTATION: Tidal Station disk VM#: 48
AGENCY: US Coast and Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete walk
The bench mark is a disk set in the concrete walk in front of the entrance to
the west side of the Coral Reef Ecology Building on the east side of the island,
10 m (32 ft) north of the SW corner of the building, 3.23 m (10.6 ft) east of
the center of the dirt road around the island, and 1.37 m (4.5 ft) west of the
west wall.
BENCH MARK STAMPING: TIDAL BM 2480 J 1978
MONUMENTATION: Tidal Station disk VM#: 49
AGENCY: National Ocean Survey (NOS) PID:
SETTING CLASSIFICATION: Concrete foundation
The bench mark is a disk set in the 1 m (3 ft) high concrete foundation on the
west side of the four fish pools on the west side of the island where there are
several 2-inch diameter galvanized steel pipes extending 3 m (9 ft) up from the
foundation around the pools, approximately 128 m (420 ft) north of bench mark NO
4 1959, 6.04 m (19.8 ft) NW of the concrete seawall, 5.12 m (16.8 ft) south of
the north end of the fish ponds, and 0.09 m (0.3 ft) east of the west side of
the foundation.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 1612480 PUBLICATION DATE: 04/21/2003
Name: MOKUOLOE, KANEOHE BAY, OAHU ISLAND
HAWAII
NOAA Chart: 19359 Latitude: 21° 26.2' N
USGS Quad: KANEOHE Longitude: 157° 47.6' W
T I D A L D A T U M S
Tidal datums at MOKUOLOE, KANEOHE BAY, OAHU ISLAND 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 (01/08/1974) = 1.091
MEAN HIGHER HIGH WATER (MHHW) = 0.646
MEAN HIGH WATER (MHW) = 0.548
MEAN TIDE LEVEL (MTL) = 0.321
MEAN SEA LEVEL (MSL) = 0.320
MEAN LOW WATER (MLW) = 0.095
MEAN LOWER LOW WATER (MLLW) = 0.000
LOWEST OBSERVED WATER LEVEL (06/10/1968) = -0.433
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 1 1957 1.079 0.532
NO 2 1957 1.163 0.615
NO 3 1957 2.042 1.494
NO 4 1959 1.067 0.519
NO 5 1967 1.531 0.983
NO 6 1967 1.957 1.410
NO 8 1968 1.881 1.334
TIDAL BM 2480 J 1978 1.828 1.280
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 1612480 PUBLICATION DATE: 04/21/2003
Name: MOKUOLOE, KANEOHE BAY, OAHU ISLAND
HAWAII
NOAA Chart: 19359 Latitude: 21° 26.2' N
USGS Quad: KANEOHE Longitude: 157° 47.6' W
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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.