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National Ocean Service
Datums Page Page 1 of 7
Station ID: 9467701 PUBLICATION DATE: 09/10/2020
Name: EMMONAK, KWIGUK PASS, YUKON RIVER
AK
NOAA Chart: 16240 Latitude: 62° 46.7' N ( 62.77750)
USGS Quad: KWIGUK C-6 Longitude: 164° 32.8' W (-164.54689)
To reach the tidal bench marks from the Emmonak airport, proceed 1.35 km (0.84
mi) WNW on the new Emmonak airport road across the Emmonak Slough to Water
Treatment Road, turn left and proceed 0.5 km (0.3 mi) SW on Water Treatment Road
to the intersection with City Office Road, turn right and proceed 0.2 km (0.1
mi) west and then north on City Office Road through the 90 degree bend near the
city office building to the intersection with Delta Street, turn left and
proceed 0.45 km (0.28 mi) west on Delta Street to the intersection with Fifth
Street, turn left and proceed 0.1 km (0.1 mi) south on Fifth Street to the
intersection with Yukon Way near the river, turn right and proceed 0.4 km (0.2
mi) WNW on Yukon Way to the Alaska Department of Fish and Game Facility on the
left. The bench marks are located between the ADF&G facility and the fish
processing plant located to the east on City Office Road. The tide station is
located at the ADF&G facility.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7701 A 2019
DESIGNATION: 946 7701 A
MONUMENTATION: Flange-encased Rod VM#: 23431
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 62° 46.7' N ( 62.77817) LONGITUDE: 164° 32.8' W (-164.54636)
The primary bench mark is a flange encased rod set on the NW side of the Alaska
Department of Fish and Game bunkhouse, 40.05 m (131.4 ft) SE of power pole
numbered 2r15 which is the taller of 2 poles, 31.52 m (103.4 ft) WSW of power
pole numbered 2R14 which is the west of 2 poles, 14.07 m (46.2 ft) north of the
NW corner of a wood cover over the utility entrance to west side of building,
3.05 m (10.0 ft) NW of the NW corner of the ADFG bunkhouse, and 0.73 m (2.4 ft)
NW of a carsonite witness post. The datum point is set 5.0 cm (2 inches) below
ground, being the top of a stainless steel rod driven 22.9 m (75.0 ft) to
refusal, in a sleeve extending to a depth of 1.0 m (3.3 ft) and encased in a
7-inch NOS logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9467701 PUBLICATION DATE: 09/10/2020
Name: EMMONAK, KWIGUK PASS, YUKON RIVER
AK
NOAA Chart: 16240 Latitude: 62° 46.7' N ( 62.77750)
USGS Quad: KWIGUK C-6 Longitude: 164° 32.8' W (-164.54689)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7701 B 2019
DESIGNATION: 946 7701 B
MONUMENTATION: Flange-encased Rod VM#: 23433
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBGM79
LATITUDE: 62° 46.6' N ( 62.77700) LONGITUDE: 164° 32.4' W (-164.53969)
The bench mark is a flange encased rod set in a triangle of grass and brush near
the catholic church, 38.50 m (126.3 ft) SE of the front door of the church
measured from the east side of the double doors, 37.12 m (121.8 ft) WSW of a
light and power pole numbered 2R7, 29.36 m (96.3 ft) SSE of the SE corner of the
church, 24.05 m (78.9 ft) ESE of support pole for power poles on the south side
of road, 13.7 m (44.9 ft) north of the river side of the rock berm, and 1.43 m
(4.7 ft) ESE of a carsonite witness post. The datum point is set 10 cm (4
inches) below ground, being the top of a stainless steel rod driven 23.2 m (76.0
ft) to refusal, in a sleeve extending to a depth of 1.0 m (3.3 ft) and encased
in a 7-inch NOS logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9467701 PUBLICATION DATE: 09/10/2020
Name: EMMONAK, KWIGUK PASS, YUKON RIVER
AK
NOAA Chart: 16240 Latitude: 62° 46.7' N ( 62.77750)
USGS Quad: KWIGUK C-6 Longitude: 164° 32.8' W (-164.54689)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7701 C 2019
DESIGNATION: 946 7701 C
MONUMENTATION: Chiseled Square VM#: 23434
AGENCY: IDB PID:
SETTING CLASSIFICATION: Cap on metal piling OPUS PID:
LATITUDE: 62° 46.6' N ( 62.77742) LONGITUDE: 164° 31.9' W (-164.53208)
The bench mark is a chiseled square on the NW corner of a cap for a 0.21 m (0.7
ft) diameter steel piling supporting a stair landing located on the north side
of the bulk fuel tank farm, 28.85 m (94.7 ft) WSW of the power pole with wires
to the farm, 11.22 m (36.8 ft) west of the NE corner of the raised part of the
facility, 10.02 m (32.9 ft) south of a power pole numbered 2r, 2.51 m (8.2 ft)
SSW of the east of two yellow steel bollards at the base of the stairs, 1.67 m
(5.5 ft) west of the NE corner of the landing, 1.62 m (5.3 ft) north of a gate
to enter the facility, 2.0 m (6.6 ft) above the ground and 0.30 m (1.0 ft) below
the top of an I-beam for decking.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9467701 PUBLICATION DATE: 09/10/2020
Name: EMMONAK, KWIGUK PASS, YUKON RIVER
AK
NOAA Chart: 16240 Latitude: 62° 46.7' N ( 62.77750)
USGS Quad: KWIGUK C-6 Longitude: 164° 32.8' W (-164.54689)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7701 D 2019
DESIGNATION: 946 7701 D
MONUMENTATION: Chiseled Square VM#: 23435
AGENCY: IDB PID:
SETTING CLASSIFICATION: Cap on metal piling OPUS PID:
LATITUDE: 62° 46.7' N ( 62.77839) LONGITUDE: 164° 31.7' W (-164.52814)
The bench mark is a chiseled square at the center of a metal grate deck near the
SE corner of the Emmonak school, 46.02 m (151.0 ft) NW of the power pole with
one transformer numbered 5l2, 27.68 m (90.8 ft) ENE of the SE corner of the wood
fence around the playground, 5.93 m (19.5 ft) west of the SE corner of the SE
piling cap, 4.80 m (15.7 ft) south of the school wall, 3.65 m (12.0 ft) east of
the east side of the stairs measured from the top, 0.97 m (3.2 ft) above the
ground and 0.25 m (0.8 ft) below top of a horizontal I-beam.
BENCH MARK STAMPING: 7701 E 2019
DESIGNATION: 946 7701 E
MONUMENTATION: Chiseled Square VM#: 23436
AGENCY: IDB PID:
SETTING CLASSIFICATION: Cap on a metal piling OPUS PID:
LATITUDE: 62° 46.5' N ( 62.77544) LONGITUDE: 164° 31.2' W (-164.52081)
The bench mark is a chiseled square on the SW corner of the SW piling of the
fish processing plant offices, 22.16 m (72.7 ft) west of the SE most piling cap
at SE corner of the metal deck, 18.42 m (60.4 ft) WSW of a power pole across the
road, 12.52 m (41.1 ft) south of the SW corner of the building, 11.65 m (38.2
ft) east of a power pole with three transformers, 11.50 m (37.7 ft) ESE of the
SE corner of a wood building, 0.72 m (2.4 ft) above the ground and 0.43 m (1.4
ft) below the deck.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9467701 PUBLICATION DATE: 09/10/2020
Name: EMMONAK, KWIGUK PASS, YUKON RIVER
AK
NOAA Chart: 16240 Latitude: 62° 46.7' N ( 62.77750)
USGS Quad: KWIGUK C-6 Longitude: 164° 32.8' W (-164.54689)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: S4462 ETS 1966
DESIGNATION: S4462 ETS
MONUMENTATION: Boundry marker VM#: 23437
AGENCY: Bureau of Land Management IDB PID:
SETTING CLASSIFICATION: Disk on a metal pipe driven into the
ground OPUS PID:
LATITUDE: 62° 46.7' N ( 62.77789) LONGITUDE: 164° 32.9' W (-164.54803)
The bench mark is a BLM brass cap set on a pipe, 72.1 m (236.5 ft) west of the
SW corner of the old metal Alaska Department of Fish and Game building, 26.80 m
(87.9 ft) east of the intersection of two dirt ATV trails, one running along the
river and the other north-south between river and road, 11.30 m (37.1 ft) NNE of
the river bank, 7.92 m (26.0 ft) SSE of a 17-inch diameter tree and 2 cm (1
inch) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9467701 PUBLICATION DATE: 09/10/2020
Name: EMMONAK, KWIGUK PASS, YUKON RIVER
AK
NOAA Chart: 16240 Latitude: 62° 46.7' N ( 62.77750)
USGS Quad: KWIGUK C-6 Longitude: 164° 32.8' W (-164.54689)
T I D A L D A T U M S
Tidal datums at EMMONAK, KWIGUK PASS, YUKON RIVER based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: July 2019 - August 2019
TIDAL EPOCH: 0000-0000
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.608
MEAN HIGH WATER MHW = 0.421
MEAN SEA LEVEL MSL = 0.244
MEAN TIDE LEVEL MTL = 0.234
MEAN LOW WATER MLW = 0.048
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7701 A 2019 3.139 2.718
7701 B 2019 2.919 2.498
7701 C 2019 4.915 4.494
7701 D 2019 4.366 3.945
7701 E 2019 3.964 3.543
S4462 ETS 1966 3.135 2.714
Foot Notes:
Data from this station was collected using methodology that does not meet CO-OPS
highest level of accuracy (no more than 10 cm, 95% Confidence Interval (CI)
referenced to a tidal datum). Recognizing that lower quality data can be used
for certain applications CO-OPS is making this data available to its users with
restraint. The average six-minute water level observations derived from this
system have an accuracy ranging from 10.0 - 30.0 cm, 95% CI on datum. Users are
cautioned to consider the accuracy of these data before using them for critical
navigational or coastal engineering purposes.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9467701 PUBLICATION DATE: 09/10/2020
Name: EMMONAK, KWIGUK PASS, YUKON RIVER
AK
NOAA Chart: 16240 Latitude: 62° 46.7' N ( 62.77750)
USGS Quad: KWIGUK C-6 Longitude: 164° 32.8' W (-164.54689)
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.