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Datums Page Page 1 of 8
Station ID: 9457804 PUBLICATION DATE: 12/15/2020
Name: ALITAK, LAZY BAY
AK
NOAA Chart: 16591 Latitude: 56° 53.8' N ( 56.89740)
USGS Quad: TRINITY ISLANDS (D-1) Longitude: 154° 14.9' W (-154.24800)
To reach the tide station, from the cannery office main door, proceed 24 m (79
ft) WSW past the flag pole to the dock and cannery entrance, then SSW 30 m (98
ft) along the dock entrance, then west 10 m (32 ft) along the corridor, then
south 32 m (105 ft) along the corridor, then west 27 m (89 ft) along the
corridor, then south 70 m (239 ft) though the warehouse and onto the dock, then
east 31 m (102 ft) along the dock to the east side of the warehouse, then north
5 m (16 ft) along the east side of the dock to first door on the left, enter the
door unto the mudroom and the tide house. The bench marks are along the cannery
roads and on the dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 6 1964
DESIGNATION: 945 7804 TIDAL 6
MONUMENTATION: Tidal Station disk VM#: 18142
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID:
SETTING CLASSIFICATION: High boulder OPUS PID:
LATITUDE: 56° 54.0' N ( 56.89944) LONGITUDE: 154° 14.9' W (-154.24800)
The primary bench mark is a disk set flush in a 3 m x 1.7 m x 0.5 m (10 ft x 5.6
ft x 1.6 ft) high boulder, 3.35 m (11.0 ft) SW (220 magnetic) of the east edge
of a concrete sidewalk, 3.15 m (10.3 ft) west of a 3 m (10 ft) high 0.4 m
diameter spruce tree, 2.80 m (9.2 ft) SE (120 magnetic) of the west corner of a
log cabin, and 0.15 m (0.49 ft) below the top of the boulder.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 9457804 PUBLICATION DATE: 12/15/2020
Name: ALITAK, LAZY BAY
AK
NOAA Chart: 16591 Latitude: 56° 53.8' N ( 56.89740)
USGS Quad: TRINITY ISLANDS (D-1) Longitude: 154° 14.9' W (-154.24800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7804 C 2006
DESIGNATION: 945 7804 C
MONUMENTATION: Tidal Station disk VM#: 18138
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 56° 53.9' N ( 56.89794) LONGITUDE: 154° 14.7' W (-154.24583)
The bench mark is a disk set flush in a rock outcrop, 8.60 m (28.2 ft) SE (120
magnetic) of the east end of a 1 m (3 ft) high white picket fence at edge of
rock wall, 4.30 m (14.1 ft) NE (60 magnetic) of the north corner of the 2-story
bunkhouse named "Winter", 2.25 m (7.4 ft) north of the east corner of a 1 m by 1
m (3 x 3 ft) steel storm drain, 0.3 m (1.0 ft) NW of a 0.5 m (1.6 ft) high
concrete wall, and 0.5 m (1.6 ft) above ground.
BENCH MARK STAMPING: 7804 A 2006
DESIGNATION: 945 7804 A
MONUMENTATION: Tidal Station disk VM#: 18139
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 56° 53.8' N ( 56.89672) LONGITUDE: 154° 14.6' W (-154.24406)
The bench mark is a disk set flush in a rock outcrop, 67.50 m (221.5 ft) east of
the south corner of the single green building, 6.30 m (20.6 ft) NW of a seasonal
stream off of bluff, 0.86 m (2.8 ft) SW of rock face at base of bluff, 0.6 m
(1.9 ft) NE of the gravel and rock outcrop interface, 10 m (33 ft) below top of
bluff and 0.5 m (1.6 ft) above gravel beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9457804 PUBLICATION DATE: 12/15/2020
Name: ALITAK, LAZY BAY
AK
NOAA Chart: 16591 Latitude: 56° 53.8' N ( 56.89740)
USGS Quad: TRINITY ISLANDS (D-1) Longitude: 154° 14.9' W (-154.24800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7804 B 2006
DESIGNATION: 945 7804 B
MONUMENTATION: Tidal Station disk VM#: 18140
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Rock outcrop OPUS PID#: BBBB49
LATITUDE: 56° 53.8' N ( 56.89725) LONGITUDE: 154° 14.7' W (-154.24503)
The bench mark is a disk set flush in a NW/SE oriented rock outcrop, 24.50 m
(80.4 ft) NW (310 magnetic) of a 3 m (9 ft) high antenna fixed in a rock
outcrop, 14 m (46 ft) SE (140 magnetic) of the south corner of a 2-story
bunkhouse, 11.30 m (37.1 ft) NE (30 magnetic) of the north corner of the
southerly most bunkhouse, 6 m (20 ft) SSW (200 magnetic) of the centerline of
an ATV trail, and 1.50 m (4.9 ft) above ground and ATV trail.
BENCH MARK STAMPING: 7804 D 2006
DESIGNATION: 945 7804 D
MONUMENTATION: Tidal Station disk VM#: 18141
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 56° 53.9' N ( 56.89867) LONGITUDE: 154° 14.8' W (-154.24661)
The bench mark is a disk set flush in a rock outcrop, 31.50 m (103.3 ft) north
(0 magnetic) of the north corner of the 2-story "Hilton" building, 1.70 m (5.6
ft) NE (40 magnetic) of a 1.3 m x 1.2 m x 0.4 m (4.3 ft x 3.9 ft x 1.3 ft) high
concrete block, and 1 m (3 ft) NW (310 magnetic) of the elbow in an 8-inch
diameter white PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9457804 PUBLICATION DATE: 12/15/2020
Name: ALITAK, LAZY BAY
AK
NOAA Chart: 16591 Latitude: 56° 53.8' N ( 56.89740)
USGS Quad: TRINITY ISLANDS (D-1) Longitude: 154° 14.9' W (-154.24800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1929
DESIGNATION: 945 7804 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 18143
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 56° 53.9' N ( 56.89911) LONGITUDE: 154° 14.9' W (-154.24764)
The bench mark is a disk set vertically in a rock outcrop, 19.20 m (63.0 ft) SE
(130 magnetic) of a 10 m (33 ft) high light pole, 2.40 m (7.9 ft) NE (40
magnetic) of the east edge of a 3 m (9.8 ft) wide concrete walk, 1 m (3 ft) WSW
(250 magnetic) of the southernmost of two 0.15 m x 0.11 m steel eye bolts
suspending the "Alitak National Park" sign, and 0.95 m (3.12 ft) above ground.
BENCH MARK STAMPING: 7804 G 2006
DESIGNATION: 945 7804 G
MONUMENTATION: Tidal Station disk VM#: 18144
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Pole barn OPUS PID:
LATITUDE: 56° 54.0' N ( 56.90008) LONGITUDE: 154° 15.0' W (-154.24942)
The bench mark is a disk set flush in the south corner of the second
northerly-most of two pole barns, 11 m (36 ft) north of the south edge of the
concrete pad near the top of the beach berm, 4.60 m (15.1 ft) NW (300 magnetic)
of the west corner of a 5 m x 11.7 m x 4 m (16 x 38.4 x 13 ft) high single story
wood building, 1.15 m (3.8 ft) SE (120 magnetic) of the SE edge of a door, and
0.05 m (0.16 ft) north of the south corner.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9457804 PUBLICATION DATE: 12/15/2020
Name: ALITAK, LAZY BAY
AK
NOAA Chart: 16591 Latitude: 56° 53.8' N ( 56.89740)
USGS Quad: TRINITY ISLANDS (D-1) Longitude: 154° 14.9' W (-154.24800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7804 H 2006
DESIGNATION: 945 7804 TIDAL H
MONUMENTATION: Tidal Station disk VM#: 18145
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Bottom step OPUS PID:
LATITUDE: 56° 54.0' N ( 56.90031) LONGITUDE: 154° 14.9' W (-154.24858)
The bench mark is a disk set flush in the bottom step of the eastern-most of
three buildings shown on the 1963 ATS survey (ADL 17934-1963), 11 m (36 ft) east
(100 magnetic) of the east corner of the pole barn containing bench mark 7804 H
2006, 4.90 m (16.1 ft) WSW (250 magnetic) of the north corner of the building
with bench mark 7804 H 2006, 0.58 m (0.16 ft) SE (140 magnetic) from the
northwesterly most of two 1-inch diameter steel pipe support members for a hand
rail on the NW side of the building, and 0.15 m (.5 ft) above ground.
BENCH MARK STAMPING: NO 1 1906
DESIGNATION: 945 7804 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 18146
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID:
SETTING CLASSIFICATION: High boulder OPUS PID:
LATITUDE: 56° 54.1' N ( 56.90136) LONGITUDE: 154° 15.0' W (-154.24981)
The bench mark is a disk set in a 4.5 m x 2.5 m x 1.5 m (14.8 ft x 8.2 ft x 4.9
ft) high boulder, 83 m (272 ft) north of the north corner of a dry wood dock, 49
m (161 ft) west (260 magnetic) of a stream, 20 m (66 ft) west (260 magnetic)
of the centerline of an ATV trail, 8 m (26 ft) SSW (200 magnetic) of the edge
of a grassy bluff, 0.5 m (1.6 ft) south from the north edge of boulder, and 0.15
m (0.5 ft) below the top of the boulder .
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9457804 PUBLICATION DATE: 12/15/2020
Name: ALITAK, LAZY BAY
AK
NOAA Chart: 16591 Latitude: 56° 53.8' N ( 56.89740)
USGS Quad: TRINITY ISLANDS (D-1) Longitude: 154° 14.9' W (-154.24800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7804 E 2006
DESIGNATION: 945 7804 E
MONUMENTATION: Tidal Station disk VM#: 18147
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 56° 53.9' N ( 56.89817) LONGITUDE: 154° 14.8' W (-154.24683)
The bench mark is a disk set flush on the top of a concrete curb near the east
entrance to the cannery, 9.73 m (31.9 ft) NE (50 magnetic) from the door knob
on a man-door with a fire extinguisher sign, 5.90 m (19.4 ft) east of the corner
leading into the cannery, 0.3 m (1 ft) north of a 0.9 m x 2 m (3 ft x 6.5 ft)
high metal man-door, and 0.09 m (0.3 ft) north from the south end of a 0.15 m x
0.14 m x 20 m (0.5 ft x 0.5 ft x 66 ft) long curb.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 9457804 PUBLICATION DATE: 12/15/2020
Name: ALITAK, LAZY BAY
AK
NOAA Chart: 16591 Latitude: 56° 53.8' N ( 56.89740)
USGS Quad: TRINITY ISLANDS (D-1) Longitude: 154° 14.9' W (-154.24800)
T I D A L D A T U M S
Tidal datums at ALITAK, LAZY BAY based on:
LENGTH OF SERIES: 11 YEARS
TIME PERIOD: 5/1/2007-4/30/2008, 6/1/2009-5/31/2019
TIDAL EPOCH: 2012-2016
CONTROL TIDE STATION: 9457292 KODIAK ISLAND, WOMENS BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (11/25/2007) = 4.921
MEAN HIGHER HIGH WATER MHHW = 3.576
MEAN HIGH WATER MHW = 3.332
MEAN TIDE LEVEL MTL = 1.905
MEAN SEA LEVEL MSL = 1.882
MEAN LOW WATER MLW = 0.479
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/14/2008) = -1.506
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 6 1964 5.806 2.474
7804 C 2006 6.867 3.535
7804 A 2006 4.565 1.233
7804 B 2006 9.181 5.849
7804 D 2006 6.505 3.173
NO 4 1929 6.536 3.204
7804 G 2006 5.139 1.807
7804 H 2006 5.106 1.774
NO 1 1906 4.421 1.089
7804 E 2006 6.226 2.894
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 9457804 PUBLICATION DATE: 12/15/2020
Name: ALITAK, LAZY BAY
AK
NOAA Chart: 16591 Latitude: 56° 53.8' N ( 56.89740)
USGS Quad: TRINITY ISLANDS (D-1) Longitude: 154° 14.9' W (-154.24800)
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.