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National Ocean Service
Datums Page Page 1 of 6
Station ID: 9491873 PUBLICATION DATE: 06/13/2013
Name: POINT HOPE
AK
NOAA Chart: 16005 Latitude: 68° 20.5' N ( 68.34170)
USGS Quad: POINT (B-3) Longitude: 166° 48.5' W (-166.80800)
To reach the tidal bench marks from the southern terminus of the Point Hope
airstrip, proceed 220 m (722 ft) SW to the shoreline. The bench marks are
located parallel to the runway on its west side. The tide station was located
approximately 2.4 km (1.5 mi) west of the native village of Point Hope, 241 km
(150 mi) NW of Kotzebue.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9491873 PUBLICATION DATE: 06/13/2013
Name: POINT HOPE
AK
NOAA Chart: 16005 Latitude: 68° 20.5' N ( 68.34170)
USGS Quad: POINT (B-3) Longitude: 166° 48.5' W (-166.80800)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: POINT HOPE 1950
DESIGNATION: POINT HOPE
MONUMENTATION: Triangulation Station disk VM#: 17436
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: UW4742
SETTING CLASSIFICATION: Concrete foundation OPUS PID#: UW4742
LATITUDE: 68° 20.7' N ( 68.34500) LONGITUDE: 166° 48.4' W (-166.80700)
The primary bench mark is a disk set flush in a 0.28 m x 0.28 m (0.9 ft x 0.9
ft) concrete and stone foundation set flush with the ground, 390 m (1280 ft)
north of the southern shore of Old Point Hope, 232 m (761 ft) NNE (15 magnetic)
of bench mark WCMC C10 S3515A L5 S3515 1964 1969, 170 m (558 ft) WNW (290
magnetic) of the centerline of the runway, 45.6 m (149.6 ft) SSW (210 magnetic)
of bench mark C9 S3515A L5 S3515A 1969, and 16 m (52.5 ft) ENE (60 magnetic) of
the NE beam of a 3.9 m x 2.5 m x 2.5 m (12.8 ft x 8.2 ft x 8.2 ft) high drying
rack.
BENCH MARK STAMPING: C9 S3515A L5 S3515A 1969
DESIGNATION: 949 1873 BLM C9L5
MONUMENTATION: Survey disk VM#: 17437
AGENCY: Department of Interior, Bureau of Land
Management IDB PID#:
SETTING CLASSIFICATION: Metal post OPUS PID:
LATITUDE: 68° 20.8' N ( 68.34670) LONGITUDE: 166° 48.4' W (-166.80700)
The bench mark is a disk attached to a metal post, 430 m (1411 ft) north of the
southern shore of Old Point Hope, 160 m (525 ft) WNW (290 magnetic) of the
centerline of the runway, 90.5 m (296.9 ft) ESE (110 magnetic) of a 2.5 m x 2.5
m x 2.4 m (8.2 ft x 8.2 ft x 7.9 ft) high wooden shed, 45.6 m (149.6 ft) NNE (30
magnetic) of bench mark POINT HOPE 1950, 10.7 m (35.1 ft) south of a four-wheel
drive trail, and 4 cm (0.1 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9491873 PUBLICATION DATE: 06/13/2013
Name: POINT HOPE
AK
NOAA Chart: 16005 Latitude: 68° 20.5' N ( 68.34170)
USGS Quad: POINT (B-3) Longitude: 166° 48.5' W (-166.80800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: C12 S3515 L11 S3515A 1969
DESIGNATION: 949 1873 BLM C12L11
MONUMENTATION: Survey disk VM#: 17438
AGENCY: Department of Interior, Bureau of Land
Management IDB PID#:
SETTING CLASSIFICATION: Metal post OPUS PID:
LATITUDE: 68° 20.6' N ( 68.34330) LONGITUDE: 166° 48.6' W (-166.81000)
The bench mark is a disk attached to a metal post, 220 m (722 ft) WSW (240
magnetic) of the centerline of the southern end of the runway (not perpendicular
distance), 86 m (282 ft) north of the southern shore of Old Point Hope, 78.39 m
(257.2 ft) SW (220 magnetic) of bench mark WCMC C10 S3515A L5 S3515 1964 1969,
and 0.21 m (0.7 ft) above the ground.
BENCH MARK STAMPING: WCMC C10 S3515A L5 S3515 1964
1969
DESIGNATION: 949 1873 BLM C10L5
MONUMENTATION: Survey disk VM#: 17439
AGENCY: Department of Interior, Bureau of Land
Management IDB PID#:
SETTING CLASSIFICATION: Metal post OPUS PID:
LATITUDE: 68° 20.6' N ( 68.34330) LONGITUDE: 166° 48.5' W (-166.80800)
The bench mark is a disk attached to a metal post on the crest of an old beach
berm, 232 m (761 ft) SSW (195 magnetic) of bench mark Point Hope 1950, 170 m
(558 ft) west (260 magnetic) of the centerline of the southern end of the
runway (not perpendicular distance), 150 m (492 ft) north of the southern shore
of Old Point Hope, 78.39 m (257.2 ft) NE (40 magnetic) of bench mark C12 S3515
L11 S3515A 1969, 19.57 m (64.2 ft) SSE (160 magnetic) of a 3.7 m x 4.3 m (12 ft
x 14 ft) wooden platform, and 0.18 m (0.6 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9491873 PUBLICATION DATE: 06/13/2013
Name: POINT HOPE
AK
NOAA Chart: 16005 Latitude: 68° 20.5' N ( 68.34170)
USGS Quad: POINT (B-3) Longitude: 166° 48.5' W (-166.80800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BLM C13L11 S3515A 1969
DESIGNATION: 949 1873 C13L11
MONUMENTATION: Survey disk VM#: 17726
AGENCY: Department of Interior, Bureau of Land
Management IDB PID#:
SETTING CLASSIFICATION: Metal post OPUS PID:
LATITUDE: 69° 20.6' N ( 69.34330) LONGITUDE: 166° 48.8' W (-166.81300)
The bench mark is a disk attached to a metal post, 370 m (1214 ft) WNW (294
magnetic) of the centerline of the southern end of the runway (not perpendicular
distance), approximately 140 m (460 ft) west ((264 magnetic) of bench mark BLM
C12 S3515 L11 S3515A 1969 (from handheld GPS coordinate inverse), 128 m (420 ft)
east (84 magnetic) of the SE corner of a 3.8 m x 4.9 m x 2.4 m (12.3 ft x 16.1
ft x 7.9 ft) high abandoned home with no roof, 100 m (328 ft) north of the
ocean, and 0.15 m (0.5 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9491873 PUBLICATION DATE: 06/13/2013
Name: POINT HOPE
AK
NOAA Chart: 16005 Latitude: 68° 20.5' N ( 68.34170)
USGS Quad: POINT (B-3) Longitude: 166° 48.5' W (-166.80800)
T I D A L D A T U M S
Tidal datums at POINT HOPE based on:
LENGTH OF SERIES: 30 Days
TIME PERIOD: July 06 2004 - August 04 2004
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9491094 RED DOG DOCK
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.205
MEAN HIGH WATER MHW = 0.182
MEAN TIDE LEVEL MTL = 0.106
MEAN SEA LEVEL MSL = 0.100
MEAN LOW WATER MLW = 0.030
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
POINT HOPE 1950 3.952 3.770
C9 S3515A L5 S3515A 1969 3.825 3.643
C12 S3515 L11 S3515A 1969 4.094 3.912
WCMC C10 S3515A L5 S3515 1964 1969 4.465 4.283
BLM C13L11 S3515A 1969 4.136 3.954
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9491873 PUBLICATION DATE: 06/13/2013
Name: POINT HOPE
AK
NOAA Chart: 16005 Latitude: 68° 20.5' N ( 68.34170)
USGS Quad: POINT (B-3) Longitude: 166° 48.5' W (-166.80800)
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 (NAVD88).
NAVD88 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. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 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 NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 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 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 NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 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, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.