U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9468841 PUBLICATION DATE: 01/17/2024
Name: UPPER GOLOVNIN LAGOON
AK
NOAA Chart: US4AK6RS Latitude: 64° 37.3' N ( 64.62083)
USGS Quad: SOLOMON C-3 Longitude: 163° 8.9' W (-163.14900)
To reach the temporary tide station 946 8841 in Golovnin Lagoon from the north
dock in the town of Golovin, proceed NW by boat along the east side of the bay
for 9.9 km (6.2 mi) to a channel separating a small island from the mainland.
Proceed NE for 0.34 km (0.2 mi) to the shore south of the mouth of the channel.
Proceed east on foot for 36 m to the tide house on a grassy spit protruding into
Golovnin Lagoon. The bench marks are in the vicinity of the tide houe, and east
of the tide house on a grassy strip of land between the eastern shore of
Golovnin Lagoon and a tidal slough running north-south. The primary and
secondary pressure gauges are offshore west of the tide house. There is an
bottom mounted pressure gauge in deep water SW of the tide station.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8841 E 2023
DESIGNATION: 946 8841 E
MONUMENTATION: Flange-encased Rod VM#: 24781
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBJJ96
LATITUDE: 64° 37.2' N ( 64.62069) LONGITUDE: 163° 8.9' E ( 163.14758)
The primary bench mark is flange encased steel rod located 212.5 m (697.2 ft)
WSW of bench mark 946 8841 D, 189 m (620.1 ft) south of the north tip of the
spit the mark in on, 29.1 m (95.5 ft) east of the high-water line of the main
body of Golovnin lagoon, 6.14 m (20.1 ft) WSW of the high-water line of a small
inner cove east of the spit the mark is on. The datum point is 7 cm (3 inches)
below ground being the top of a flange encased stainless steel rod driven 12.8 m
(42.0 ft) to refusal, in a sleeve extending to a depth of 0.9 m (3.0 ft) and
encased in a 7-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9468841 PUBLICATION DATE: 01/17/2024
Name: UPPER GOLOVNIN LAGOON
AK
NOAA Chart: US4AK6RS Latitude: 64° 37.3' N ( 64.62083)
USGS Quad: SOLOMON C-3 Longitude: 163° 8.9' W (-163.14900)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8841 D 2023
DESIGNATION: 946 8841 D
MONUMENTATION: Flange-encased Rod VM#: 24782
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 64° 37.3' N ( 64.62119) LONGITUDE: 163° 8.6' E ( 163.14328)
The bench mark is a flange encased steel rod located 212.5 m (697.2 ft) ENE of
bench mark 946 8841 E, 72.80 m (238.8 ft) south of bench mark 946 8841 C, 36 m
(118.1 ft) east of the high water mark of the Golovnin lagoon, and 16 m (52.5
ft) west of the high water line of a small tidal slough. The datum point is 7
cm (3 inches) below ground being the top of a flange encased stainless steel rod
driven 8.2 m (26.9 ft) to refusal, in a sleeve extending to a depth of 0.9 m
(3.0 ft) and encased in a 7-inch NOS logo cap.
BENCH MARK STAMPING: 8841 C 2023
DESIGNATION: 946 8841 C
MONUMENTATION: Flange-encased Rod VM#: 24783
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 64° 37.3' N ( 64.62183) LONGITUDE: 163° 8.6' E ( 163.14300)
The bench mark is a flange encased steel rod located 72.80 m (238.8 ft) north of
bench mark 946 8841 D, 70.23 m (230.4 ft) south of bench mark 946 8841 B, 33 m
(108.3 ft) east of the high water line of the Golovnin lagoon, 9.8 m (32.2 ft)
west of the high water line of a small tidal slough. The datum point is 7 cm (3
inches) below ground being the top of a flange encased stainless steel rod
driven 18.9 m (62.0 ft) to refusal, in a sleeve extending to a depth of 0.9 m
(3.0 ft) and encased in a 7-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9468841 PUBLICATION DATE: 01/17/2024
Name: UPPER GOLOVNIN LAGOON
AK
NOAA Chart: US4AK6RS Latitude: 64° 37.3' N ( 64.62083)
USGS Quad: SOLOMON C-3 Longitude: 163° 8.9' W (-163.14900)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8841 B 2023
DESIGNATION: 946 8841 B
MONUMENTATION: Flange-encased Rod VM#: 24784
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 64° 37.3' N ( 64.62247) LONGITUDE: 163° 8.6' E ( 163.14286)
The bench mark is a flange encased steel rod located 75.56 m (247.9 ft) SSW of
bench mark 946 8841 A, 70.23 m (230.4 ft) north of bench mark 946 8841 C, 25 m
(82.0 ft) ESE of the high water line of the Golovnin lagoon, 10 m (32.8 ft) WNW
of the high water line of a small tidal slough. The datum point is 7 cm (3
inches) below ground being the top of a flange encased stainless steel rod
driven 9.4 m (30.8 ft) to refusal, in a sleeve extending to a depth of 0.9 m
(3.0 ft) and encased in a 7-inch nos logo cap.
BENCH MARK STAMPING: 8841 A 2023
DESIGNATION: 946 8841 A
MONUMENTATION: Flange-encased Rod VM#: 24785
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBJK02
LATITUDE: 64° 37.4' N ( 64.62311) LONGITUDE: 163° 8.5' E ( 163.14244)
The bench mark is a flange encased steel rod located 258 m (846.5 ft) ENE of the
high water line on the northeastern tip of the spit across the lagoon, 75 m
(246.1 ft) NNE of bench mark 8841 B, 30 m (98.4 ft) ESE of the high water line
of the Golovnin lagoon, 20 m (65.6 ft) NW of the high water line of a small
tidal slough. The datum point is 7 cm (3 inches) below ground being the top of
a flange encased stainless steel rod driven 8.2 m (26.9 ft) to refusal, in a
sleeve extending to a depth of 0.9 m (3.0 ft) and encased in a 7-inch NOS logo
cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9468841 PUBLICATION DATE: 01/17/2024
Name: UPPER GOLOVNIN LAGOON
AK
NOAA Chart: US4AK6RS Latitude: 64° 37.3' N ( 64.62083)
USGS Quad: SOLOMON C-3 Longitude: 163° 8.9' W (-163.14900)
T I D A L D A T U M S
Tidal datums at UPPER GOLOVNIN LAGOON based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: July 2023 - September 2023
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9468756 NOME, NORTON SOUND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.927
MEAN HIGH WATER MHW = 0.901
MEAN TIDE LEVEL MTL = 0.458
MEAN SEA LEVEL MSL = 0.446
MEAN LOW WATER MLW = 0.015
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.700
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8841 E 2023 2.327 1.426
8841 D 2023 2.237 1.336
8841 C 2023 2.380 1.479
8841 B 2023 2.015 1.114
8841 A 2023 2.308 1.407
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9468841 PUBLICATION DATE: 01/17/2024
Name: UPPER GOLOVNIN LAGOON
AK
NOAA Chart: US4AK6RS Latitude: 64° 37.3' N ( 64.62083)
USGS Quad: SOLOMON C-3 Longitude: 163° 8.9' W (-163.14900)
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.