U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9466084 PUBLICATION DATE: 01/05/2022
Name: CHEFORNAK, KINIA RIVER
AK
NOAA Chart: US2AK95M Latitude: 60° 9.6' N ( 60.15942)
USGS Quad: BAIRD INLET Longitude: 164° 16.4' W (-164.27261)
To reach the station from the Chefornak Airport apron, proceed 2.6 km (1.6 mi)
north on the gravel road from the airstrip to the school at the southwest corner
of the community, follow the curve in the road to the right and proceed
east-northeast 0.6 km (0.4 mi) to the bank of the Kinia River. The bench marks
are located along the road to the airport, the road to the barge landing, and
the boardwalk on the east side of the village. The tide gauge was located on
the east side of the village, along the bank of the Kinia River.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6084 A 2021
DESIGNATION: 946 6084 A
MONUMENTATION: Flange-encased Rod VM#: 23961
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBHK20
LATITUDE: 60° 9.5' N ( 60.15831) LONGITUDE: 164° 16.3' W (-164.27125)
The bench mark is a flange encased rod set on a small rise north of the
boardwalk leading to the jonathan lewis community service center, 81.60 m (267.7
ft) WSW of the GCI communications tower, 65.2 m (213.9 ft) south of the SW
corner of the abandoned red building, 63.60 m (208.7 ft) ESE of the SE corner of
the KAE camp trailer, and 2.06 m (6.8 ft) NW of the centerline of the boardwalk.
The datum point is set 14 cm (6 inches) below grade, being the top of a
stainless steel rod driven 4.0 m (13.1 ft) to refusal, and encased in a 6 inch
(15 cm) pvc pipe and NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9466084 PUBLICATION DATE: 01/05/2022
Name: CHEFORNAK, KINIA RIVER
AK
NOAA Chart: US2AK95M Latitude: 60° 9.6' N ( 60.15942)
USGS Quad: BAIRD INLET Longitude: 164° 16.4' W (-164.27261)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6084 B 2021
DESIGNATION: 946 6084 B
MONUMENTATION: See descriptive text VM#: 23962
AGENCY: IDB PID:
SETTING CLASSIFICATION: Steel pipe cap on thermopile OPUS PID:
LATITUDE: 60° 9.5' N ( 60.15786) LONGITUDE: 164° 17.0' W (-164.28256)
The bench mark is the chiseled square on top of the corner of a steel cap on an
arctic thermopile supporting the north corner of the Chefornak school, 73.60 m
(241.5 ft) WSW of the SW corner of the main store building, 67.30 m (220.8 ft)
ENE of the SE corner of a white semicircular shop building, 24.10 m (79.1 ft)
south of the southwest corner of a white power utility building, and 7.10 m
(23.3 ft) south-southeast of the centerline of the main boardwalk into the
village.
BENCH MARK STAMPING: 6084 C 2021
DESIGNATION: 946 6084 C
MONUMENTATION: Bench Mark disk VM#: 23963
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Boulder OPUS PID:
LATITUDE: 60° 9.6' N ( 60.15925) LONGITUDE: 164° 17.0' W (-164.28342)
The bench mark is a disk set in a large boulder on the SW side of the road to
the barge landing on the kinia river, 126.5 m (415.0 ft) north of the NE corner
of a semicircular white shop building, 108.6 m (356.3 ft) NNW of the north
outside wall of a brown fuel tank on the rear of the generator building, 76.10 m
(249.7 ft) south of the boat fuel pump shack, and 6.66 m (21.9 ft) WSW of the
centerline of the gravel road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9466084 PUBLICATION DATE: 01/05/2022
Name: CHEFORNAK, KINIA RIVER
AK
NOAA Chart: US2AK95M Latitude: 60° 9.6' N ( 60.15942)
USGS Quad: BAIRD INLET Longitude: 164° 16.4' W (-164.27261)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6084 D 2021
DESIGNATION: 946 6084 D
MONUMENTATION: Flange-encased Rod VM#: 23964
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBHK19
LATITUDE: 60° 9.3' N ( 60.15417) LONGITUDE: 164° 17.2' W (-164.28592)
The bench mark is a flange encased rod set on a small hill west of the road to
the airport, 431 m (1414.0 ft) north of the base of the north most wind turbine,
423 m (1387.8 ft) south of the SW corner of a semicircular shop building, 90.80
m (297.9 ft) ENE of the south end of a boardwalk leading to the village dump,
and 78.10 m (256.2 ft) west of the centerline of the gravel road leading to the
airport. The datum point is set below grade, being the top of a stainless steel
rod driven 4.9 m (16.0 ft) to refusal, and encased in a 6 inch (15 cm) pvc pipe
with NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9466084 PUBLICATION DATE: 01/05/2022
Name: CHEFORNAK, KINIA RIVER
AK
NOAA Chart: US2AK95M Latitude: 60° 9.6' N ( 60.15942)
USGS Quad: BAIRD INLET Longitude: 164° 16.4' W (-164.27261)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: CFK B 2015
DESIGNATION: CFK B
MONUMENTATION: Flange-encased Rod VM#: 23965
AGENCY: R&M Consultants IDB PID#: DQ2641
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 60° 9.0' N ( 60.15025) LONGITUDE: 164° 17.2' W (-164.28600)
The mark is a flange encased rod set in the tundra west of the airport road,
100.9 m (331.0 ft) east of the NE most wind turbine, 29.9 m (98.1 ft) NE of a 30
cm (12 inch) diameter wood utility pole, 38.4 m (126.0 ft) SW of a 30 cm (12
inch) wood utility pole, and 12.2 m (40.0 ft) NW of the centerline of the
airport access road. The datum point is projecting 22 cm (9 inches) above the
aluminum logo cap, being the top of a stainless steel rod encased in a 6 inch
(15 cm) pvc pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9466084 PUBLICATION DATE: 01/05/2022
Name: CHEFORNAK, KINIA RIVER
AK
NOAA Chart: US2AK95M Latitude: 60° 9.6' N ( 60.15942)
USGS Quad: BAIRD INLET Longitude: 164° 16.4' W (-164.27261)
T I D A L D A T U M S
Tidal datums at CHEFORNAK, KINIA RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: July 2021 - September 2021
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9463502 PORT MOLLER, BRISTOL BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.556
MEAN HIGH WATER MHW = 1.281
MEAN SEA LEVEL MSL = 0.754
MEAN TIDE LEVEL MTL = 0.721
MEAN LOW WATER MLW = 0.160
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.527
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6084 A 2021 3.010 1.729
6084 B 2021 10.030 8.749
6084 C 2021 3.043 1.762
6084 D 2021 11.497 10.216
CFK B 2015 12.414 11.133
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9466084 PUBLICATION DATE: 01/05/2022
Name: CHEFORNAK, KINIA RIVER
AK
NOAA Chart: US2AK95M Latitude: 60° 9.6' N ( 60.15942)
USGS Quad: BAIRD INLET Longitude: 164° 16.4' W (-164.27261)
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.