U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9465203 PUBLICATION DATE: 11/23/2020
Name: NAKNEK, NAKNEK RIVER
AK
NOAA Chart: 16323 Latitude: 58° 43.9' N ( 58.73206)
USGS Quad: NAKNEK Longitude: 156° 59.0' W (-156.98333)
To reach the tidal bench marks from the Naknek airport proceed SSE on Airport
Road for 0.64 km (0.40 mi) to the intersection with Monsen Street, turn left and
proceed NE then around a curve heading SE on Monsen Street for 0.35 km (0.22 mi)
to the intersection with the Alaska Peninsula Highway, turn left and proceed
northeasterly on the Alaska Peninsula Highway for 1.72 km (1.07 mi) passing HUD
subdivision road to the intersection with Dock Road, turn right and proceed east
on Dock Road for 0.33 km (0.21 mi) into the harbor area to its termination at
the pier. The bench marks are located along Dock Road, Snob Hill Road on the
west side of the Alaska Peninsula Highway and near the pier. The tide station is
located at the SE end of the pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5203 A 2019
DESIGNATION: 946 5203 A
MONUMENTATION: Tidal Station disk VM#: 23167
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 58° 43.9' N ( 58.73208) LONGITUDE: 156° 59.0' E ( 156.98342)
The primary bench mark is a disk set flush in 3 x 3 x 3 m (9.8 ft) concrete
foundation for a large luminare tower located near the SE end of the sheet pile
pier, 11.6 m (38.1 ft) NW of a 0.60 m (2.0 ft) diameter by 1.20 m (3.9 ft) high
steel bollard, 4.20 m (13.8 ft) NNE of the steel dock sheet pile and 0.66 m (2.2
ft) SE of a 0.51 m (1.7 ft) diameter steel light pole.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9465203 PUBLICATION DATE: 11/23/2020
Name: NAKNEK, NAKNEK RIVER
AK
NOAA Chart: 16323 Latitude: 58° 43.9' N ( 58.73206)
USGS Quad: NAKNEK Longitude: 156° 59.0' W (-156.98333)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5203 B 2019
DESIGNATION: 946 5203 B
MONUMENTATION: Tidal Station disk VM#: 23168
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 58° 44.0' N ( 58.73267) LONGITUDE: 156° 59.0' E ( 156.98300)
The bench mark is disk set in a 3 x 3 x 3 m (9.8 ft) concrete foundation for a
large luminare tower which is located near the center of the harbor facility, 73
m (239.5 ft) NE of bench mark 5203 A 2019, 25.4 m (83.3 ft) NW of the edge of
the dock, 0.74 m (2.4 ft) south of a 0.51 m (1.7 ft) diameter steel light pole,
and 6 cm (2 inches) below grade.
BENCH MARK STAMPING: 5203 C 2019
DESIGNATION: 946 5203 C
MONUMENTATION: Tidal Station disk VM#: 23169
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID#: BBGN16
LATITUDE: 58° 44.0' N ( 58.73347) LONGITUDE: 156° 59.1' E ( 156.98517)
The bench mark is disk set in 3 x 3 x 3 m (9.8 ft) concrete foundation for a
large luminare tower located on the south side of dock road, 14.7 m (48.2 ft)
south of the centerline of dock road, 11.8 m (38.7 ft) NE of the NE corner of
the white and green public restroom building and 0.68 m (2.2 ft) ESE of a 0.51 m
(1.7 ft) diameter steel light pole.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9465203 PUBLICATION DATE: 11/23/2020
Name: NAKNEK, NAKNEK RIVER
AK
NOAA Chart: 16323 Latitude: 58° 43.9' N ( 58.73206)
USGS Quad: NAKNEK Longitude: 156° 59.0' W (-156.98333)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5203 D 2019
DESIGNATION: 946 5203 D
MONUMENTATION: Flange-encased Rod VM#: 23175
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBGN15
LATITUDE: 58° 44.0' N ( 58.73353) LONGITUDE: 156° 59.3' E ( 156.98800)
The bench mark is a flange encased rod set at the north end of a fence in a
parking lot located near the intersection of dock road and the Alaska peninsula
highway, just east of the highway and on the south side of dock road, 39.4 m
(129.3 ft) ESE of the centerline of the Alaska peninsula highway, 29.2 m (95.8
ft) west of the NW corner of the borough public works building, 14.7 m (48.2 ft)
south of the centerline of dock road and 1.01 m (3.3 ft) WSW of the north end of
a chain link fence. The datum point is set 3 inches (8 cm) below ground, being
the top of a stainless steel rod driven 46.0 ft (14.0 m) to refusal, in a sleeve
extending to a depth of 0.9 m (3.0 ft) and encased in a 7-inch NOS logo cover
with concrete kick block.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9465203 PUBLICATION DATE: 11/23/2020
Name: NAKNEK, NAKNEK RIVER
AK
NOAA Chart: 16323 Latitude: 58° 43.9' N ( 58.73206)
USGS Quad: NAKNEK Longitude: 156° 59.0' W (-156.98333)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5203 E 2019
DESIGNATION: 946 5203 E
MONUMENTATION: Flange-encased Rod VM#: 23176
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBGN17
LATITUDE: 58° 44.1' N ( 58.73492) LONGITUDE: 156° 59.4' E ( 156.98947)
The bench mark is a flange encased rod set on the north side of snob hill road,
8.1 m (26.6 ft) NNW of the centerline of the road, 1.80 m (5.9 ft) ENE of the
center of a 4.42 x 1.22 x 0.58 m (1.9 ft) block of concrete and 1.19 m (3.9 ft)
east of a carsonite witness post. The datum point is set 3 inches (8 cm) below
the ground, being the top of a stainless steel rod driven 39 ft (11.9 m) to
refusal, in a sleeve extending to a depth of 0.9 m (3.0 ft) and encased in a
7-inch NOS logo cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9465203 PUBLICATION DATE: 11/23/2020
Name: NAKNEK, NAKNEK RIVER
AK
NOAA Chart: 16323 Latitude: 58° 43.9' N ( 58.73206)
USGS Quad: NAKNEK Longitude: 156° 59.0' W (-156.98333)
T I D A L D A T U M S
Tidal datums at NAKNEK, NAKNEK RIVER based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: August 2019 - September 2019
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9459450 SAND POINT, POPOF ISLAND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 6.109
MEAN HIGH WATER MHW = 5.649
MEAN TIDE LEVEL MTL = 3.022
MEAN SEA LEVEL MSL = 2.787
North American Vertical Datum NAVD88 = 1.378
MEAN LOW WATER MLW = 0.394
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5203 A 2019 8.881 3.232
5203 B 2019 8.877 3.228
5203 C 2019 16.443 10.794
5203 D 2019 20.163 14.514
5203 E 2019 22.653 17.004
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9465203 PUBLICATION DATE: 11/23/2020
Name: NAKNEK, NAKNEK RIVER
AK
NOAA Chart: 16323 Latitude: 58° 43.9' N ( 58.73206)
USGS Quad: NAKNEK Longitude: 156° 59.0' W (-156.98333)
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.