U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9468877 PUBLICATION DATE: 05/28/2025
Name: WHITE MOUNTAIN, NIUKLUK
AK
NOAA Chart: US4AK6RR Latitude: 64° 40.9' N ( 64.68114)
USGS Quad: SOLOMON C-3 NW QUADRANGLE Longitude: 163° 24.7' W (-163.41191)
To reach the tide station from the White Mountain Post Office on Main Street,
proceed WNW on Main Street for 0.24 km (0.15 mi) to where the road forks, stay
to the left and continue on High School Road west 0.18 km (0.11 mi) to the
school gym. The tide gauge was on the bank of the river on the left. The bench
marks are located along High School Road and Main Street to the east.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8877 A 2024
DESIGNATION: 946 8877 A
MONUMENTATION: Flange-encased Rod VM#: 25074
AGENCY: AKDNR IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBJT48
LATITUDE: 64° 40.8' N ( 64.68081) LONGITUDE: 163° 24.6' W (-163.40970)
The bench mark is a flange encased stainless-steel rod, 296 m (971.1 ft) WNW of
the SW corner of the blue post office building, 53.6 m (175.9 ft) SSE of the SE
corner of the red city office building, 29.0 m (95.1 ft) south of the SE corner
of a chain link fence surrounding a large white fuel tank, 15.8 m (51.8 ft) NNE
of the centerline of the beach road, a small atv trail running east to west
along the waterfront. The datum point is set 7.5 cm (3 inches) below grade,
being the top of a stainless-steel rod driven 4.8 m (15.7 ft) to refusal, in a
sleeve extending to a depth of 0.9 m (3.0 ft) and encased in an 18 cm (7 inches)
AKDNR logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9468877 PUBLICATION DATE: 05/28/2025
Name: WHITE MOUNTAIN, NIUKLUK
AK
NOAA Chart: US4AK6RR Latitude: 64° 40.9' N ( 64.68114)
USGS Quad: SOLOMON C-3 NW QUADRANGLE Longitude: 163° 24.7' W (-163.41191)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8877 B 2024
DESIGNATION: 946 8877 B
MONUMENTATION: Flange-encased Rod VM#: 25075
AGENCY: AKDNR IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 64° 40.8' N ( 64.68069) LONGITUDE: 163° 24.5' W (-163.40758)
The bench mark is a flange encased stainless-steel rod, 107.4 m (352.4 ft) ESE
of the SE corner of a grey fuel pump shack, 29.6 m (97.1 ft) ESE of the NE
corner of a small white house, 4.8 m (15.7 ft) south of the centerline of main
street, 3.0 m (9.8 ft) east of a newly laid black hdpe drainage culvert 46 cm
(18 inches) in diameter. The datum point is set 8.0 cm (3 inches) below grade,
being the top of a stainless-steel rod driven 11 m (36.1 ft) to refusal, in a
sleeve extending to a depth of 0.9 m (3.0 ft) and encased in an 18 cm (7 inches)
AKDNR logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9468877 PUBLICATION DATE: 05/28/2025
Name: WHITE MOUNTAIN, NIUKLUK
AK
NOAA Chart: US4AK6RR Latitude: 64° 40.9' N ( 64.68114)
USGS Quad: SOLOMON C-3 NW QUADRANGLE Longitude: 163° 24.7' W (-163.41191)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8877 C 2024
DESIGNATION: 946 8877 C
MONUMENTATION: Flange-encased Rod VM#: 25076
AGENCY: AKDNR IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 64° 40.8' N ( 64.68050) LONGITUDE: 163° 24.4' W (-163.40605)
The bench mark is a flange encased stainless-steel rod, 89.5 m (293.6 ft) WNW of
the SW corner of a green metal sewage pump station building, 70.2 m (230.3 ft)
SSE of the SE corner of a large gray metal building with a domed roof, 27.4 m
(89.9 ft) WNW of a wooden light pole 24 cm (9 inches) in diameter, 9.9 m (32.5
ft) SSW of the centerline of main street. The datum point is set 4.5 cm (2
inches) below grade, being the top of a stainless-steel rod driven 11 m (36.1
ft) to refusal, in a sleeve extending to a depth of 0.9 m (3.0 ft) and encased
in an 18 cm (7 inches) AKDNR logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9468877 PUBLICATION DATE: 05/28/2025
Name: WHITE MOUNTAIN, NIUKLUK
AK
NOAA Chart: US4AK6RR Latitude: 64° 40.9' N ( 64.68114)
USGS Quad: SOLOMON C-3 NW QUADRANGLE Longitude: 163° 24.7' W (-163.41191)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8877 D 2024
DESIGNATION: 946 8877 D
MONUMENTATION: Flange-encased Rod VM#: 25077
AGENCY: AKDNR IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBJT47
LATITUDE: 64° 40.8' N ( 64.68001) LONGITUDE: 163° 24.3' W (-163.40450)
The bench mark is a flange encased stainless-steel rod, 37.7 m (123.7 ft) NW of
the NW corner of the blue white mountain post office building, 13.8 m (45.3 ft)
SW of the SW corner of a green metal sewage pump station building, 7.1 m (23.3
ft) SW of the centerline of main street, 1.8 m (5.9 ft) SSW of a wooden light
pole 24 cm (9 inches) in diameter. The datum point is set 9 cm (4 inches) below
grade, being the top of a stainless-steel rod driven 7.3 m (24.0 ft) to refusal,
in a sleeve extending to a depth of 0.9 m (3.0 ft) and encased in an 18 cm (7
inches) AKDNR logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9468877 PUBLICATION DATE: 05/28/2025
Name: WHITE MOUNTAIN, NIUKLUK
AK
NOAA Chart: US4AK6RR Latitude: 64° 40.9' N ( 64.68114)
USGS Quad: SOLOMON C-3 NW QUADRANGLE Longitude: 163° 24.7' W (-163.41191)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8877 E 2024
DESIGNATION: 946 8877 E
MONUMENTATION: Flange-encased Rod VM#: 25078
AGENCY: AKDNR IDB PID#:
SETTING CLASSIFICATION: stainless steel rod in sleeve OPUS PID#: BBJT49
LATITUDE: 64° 40.7' N ( 64.67831) LONGITUDE: 163° 24.1' W (-163.40125)
The bench mark is a flange encased stainless-steel rod, 69.2 m (227.0 ft) NW of
the NW corner of the white mountain tribal center building, 26.9 m (88.3 ft) WSW
of the SW corner of an old green dot shop building, 12.0 m (39.4 ft) north of
the centerline of Shoogukwruk road, 5.7 m (18.7 ft) east of the NE corner of
galvanized steel bull rail 8 cm (3 inches) in diameter protecting a sewage line.
The datum point is set 10.5 cm (4 inches) below grade, being the top of a
stainless-steel rod driven 1.8 m (5.9 ft) to refusal, in a sleeve extending to a
depth of 0.9 m (3.0 ft) and encased in an 18 cm (7 inches) AKDNR logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9468877 PUBLICATION DATE: 05/28/2025
Name: WHITE MOUNTAIN, NIUKLUK
AK
NOAA Chart: US4AK6RR Latitude: 64° 40.9' N ( 64.68114)
USGS Quad: SOLOMON C-3 NW QUADRANGLE Longitude: 163° 24.7' W (-163.41191)
T I D A L D A T U M S
Tidal datums at WHITE MOUNTAIN, NIUKLUK based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: July 2024
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 = 0.286
MEAN HIGH WATER MHW = 0.286
MEAN TIDE LEVEL MTL = 0.143
MEAN SEA LEVEL MSL = 0.124
MEAN LOW WATER MLW = 0.000
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -1.670
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8877 A 2024 4.532 4.246
8877 B 2024 7.288 7.002
8877 C 2024 4.971 4.685
8877 D 2024 2.660 2.374
8877 E 2024 17.210 16.924
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9468877 PUBLICATION DATE: 05/28/2025
Name: WHITE MOUNTAIN, NIUKLUK
AK
NOAA Chart: US4AK6RR Latitude: 64° 40.9' N ( 64.68114)
USGS Quad: SOLOMON C-3 NW QUADRANGLE Longitude: 163° 24.7' W (-163.41191)
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.