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National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9457376 PUBLICATION DATE: 09/05/2014
Name: UZKOSTI POINT
AK
NOAA Chart: 16594 Latitude: 57° 55.7' N ( 57.92830)
USGS Quad: KODIAK (D-3), ALASKA Longitude: 152° 48.7' W (-152.81200)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7376 A 2014
DESIGNATION: 945 7376 A
MONUMENTATION: Bench Mark disk VM#: 21208
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Bedrock outcrop OPUS PID#: BBDP10
LATITUDE: 57° 55.6' N ( 57.92683) LONGITUDE: 152° 48.6' W (-152.81083)
The primary bench mark is a disk set flush in bedrock on the first vegetated
outcrop S of Uzkosti Point. When on the mark, Uzkosti Point bears 226 T (210
M), the G 3 daymark across Whale Passage bears 161 T (145 M), the R 4
daymark bears 126 T (110 M), and Ilkognak Rock at the entrance to Whale
Passage bears 131 T (115 M). A natural range is formed by the outcropping of
rocks on the beach 50 feet (15.24 meters) SE from the primary benchmark SE and R
4 in the distance.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9457376 PUBLICATION DATE: 09/05/2014
Name: UZKOSTI POINT
AK
NOAA Chart: 16594 Latitude: 57° 55.7' N ( 57.92830)
USGS Quad: KODIAK (D-3), ALASKA Longitude: 152° 48.7' W (-152.81200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7376 B 2014
DESIGNATION: 945 7376 B
MONUMENTATION: Bench Mark disk VM#: 21209
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Bedrock outcrop OPUS PID:
LATITUDE: 57° 55.6' N ( 57.92700) LONGITUDE: 152° 48.6' W (-152.80950)
The bench mark is a disk set flush in a bedrock outcrop. When on the mark,
Uzkosti Point bears 251 T (235 M), the G 3 daymark across Whale Passage
bears 166 T (150 M), the R 4 daymark bears 116 T (100 M), and Ilkognak
Rock at the entrance to Whale Passage bears 131 T (115 M). The benchmark is 15
feet (4.57 meters) below the ledge and tree line.
BENCH MARK STAMPING: 7376 C 2014
DESIGNATION: 945 7376 C
ALIAS:
MONUMENTATION: Bench Mark disk VM#: 21210
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Bedrock outcrop OPUS PID:
LATITUDE: 57° 55.6' N ( 57.92700) LONGITUDE: 152° 48.5' W (-152.80867)
The bench mark is a disk set flush in a bedrock outcrop with approximately 50
geological striation. When on the mark, Uzkosti Point bears 251 T (235 M), the
G 3 daymark across Whale Passage bears 166 T (150 M), the R 4 daymark
bears 131 T (115 M), and Ilkognak Rock at the entrance to Whale Passage bears
141 T (125 M). The benchmark is 10 feet (3.05 meters) below the ledge and tree
line.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9457376 PUBLICATION DATE: 09/05/2014
Name: UZKOSTI POINT
AK
NOAA Chart: 16594 Latitude: 57° 55.7' N ( 57.92830)
USGS Quad: KODIAK (D-3), ALASKA Longitude: 152° 48.7' W (-152.81200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7376 D 2014
DESIGNATION: 945 7376 D
MONUMENTATION: Bench Mark disk VM#: 21211
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Bedrock outcrop OPUS PID:
LATITUDE: 57° 55.6' N ( 57.92700) LONGITUDE: 152° 48.5' W (-152.80817)
The bench mark is a disk set flush in a bedrock outcrop. When on the mark,
Uzkosti Point bears 256 T (240 M), the G 3 daymark across Whale Passage
bears 171 T (155 M), the R 4 daymark bears 116 T (100 M), and Ilkognak
Rock at the entrance to Whale Passage bears 131 T (115 M). The benchmark is 15
feet (4.57 meters) SE of the ledge and tree line.
BENCH MARK STAMPING: 7376 E 2014
DESIGNATION: 945 7376 E
ALIAS:
MONUMENTATION: Bench Mark disk VM#: 21212
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Bedrock outcrop OPUS PID:
LATITUDE: 57° 55.6' N ( 57.92683) LONGITUDE: 152° 48.4' W (-152.80733)
The bench mark is a disk set flush in bedrock. When on the mark, Uzkosti Point
bears 256 T (240 M), the G 3 daymark across Whale Passage bears 171 T (155
M), the R 4 daymark bears 116 T (100 M), and Ilkognak Rock at the entrance
to Whale Passage bears 131 T (115 M). The benchmark is 4 feet (1.22 meters)
below the ledge and tree line.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9457376 PUBLICATION DATE: 09/05/2014
Name: UZKOSTI POINT
AK
NOAA Chart: 16594 Latitude: 57° 55.7' N ( 57.92830)
USGS Quad: KODIAK (D-3), ALASKA Longitude: 152° 48.7' W (-152.81200)
T I D A L D A T U M S
Tidal datums at UZKOSTI POINT based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: June 2014 - June 2014
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9457804 ALITAK, LAZY BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 3.446
MEAN HIGH WATER MHW = 3.160
MEAN SEA LEVEL MSL = 1.851
MEAN TIDE LEVEL MTL = 1.838
MEAN LOW WATER MLW = 0.516
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7376 A 2014 2.978 -0.182
7376 B 2014 1.505 -1.655
7376 C 2014 2.075 -1.085
7376 D 2014 1.134 -2.026
7376 E 2014 0.987 -2.173
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9457376 PUBLICATION DATE: 09/05/2014
Name: UZKOSTI POINT
AK
NOAA Chart: 16594 Latitude: 57° 55.7' N ( 57.92830)
USGS Quad: KODIAK (D-3), ALASKA Longitude: 152° 48.7' W (-152.81200)
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.