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Bench Mark Sheet for 9455732, KALIGAN ISLAND (NORTH END), COOK INLET AK

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                                                
Station ID: 9455732                         PUBLICATION DATE:  08/28/2014
Name:       KALIGAN ISLAND (NORTH END),  COOK INLET           
            AK
NOAA Chart: 16662                           Latitude:   60° 30.7' N (  60.51170)
USGS Quad:  KENAI B-6                       Longitude: 151° 57.1' W (-151.95200)


To reach the tidal bench marks and North Kalgin Island Tide Station, from Kenai
head west out of the Kenai River into Cook Inlet.  Continue west across Cook
Inlet to the NW end of Kalgin Island.  The tide station was located on the tip
of the Northwest Point on the NE side of Cobb Cove.  The bench marks were
located in the vicinity.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  5732 B 1999
                         DESIGNATION:          945 5732 B

MONUMENTATION:           Bench Mark disk                       VM#:        15972
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Boulder                               OPUS PID:        
LATITUDE:   60° 30.5' N (  60.50830)          LONGITUDE: 151° 56.9' W (-151.94800)


The primary bench mark is a disk set in a boulder on the NW side of a rocky
beach, located SE (120  magnetic) from two large offshore boulders, 42 m (138
ft) SE (165  magnetic) from bench mark 5732 C 1999, 40 m (131ft) NE (039 
magnetic) from bench mark 5732 A 1999, approximately 3 m (10 ft) below
vegetation line, and approximately 2 m (7 ft) above the apparent high water
line.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 9455732                         PUBLICATION DATE:  08/28/2014
Name:       KALIGAN ISLAND (NORTH END),  COOK INLET           
            AK
NOAA Chart: 16662                           Latitude:   60° 30.7' N (  60.51170)
USGS Quad:  KENAI B-6                       Longitude: 151° 57.1' W (-151.95200)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  5732 A 1999
                         DESIGNATION:          945 5732 A

MONUMENTATION:           Bench Mark disk                       VM#:        15971
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Boulder                               OPUS PID:        
LATITUDE:   60° 30.5' N (  60.50830)          LONGITUDE: 151° 56.9' W (-151.94800)


The bench mark is a disk set in the largest boulder on the beach, set in a flat
spot 1 m (3 ft) from the top of the boulder, 40 m (131ft) SW (219  magnetic)
from bench mark 5732 B 1999, 31 m (102 ft) NW (332  magnetic) from bench mark
5732 E 1999, approximately 2 m (7 ft) below vegetation line and approximately 1
m (3 ft) above the apparent high water line.



                         BENCH MARK STAMPING:  5732 C 1999
                         DESIGNATION:          945 5732 C

MONUMENTATION:           Bench Mark disk                       VM#:        15973
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Boulder                               OPUS PID:        
LATITUDE:   60° 30.5' N (  60.50830)          LONGITUDE: 151° 56.9' W (-151.94800)


The bench mark is a disk set in a large prominent boulder on the north side of a
rocky beach, located directly inshore of the largest exposed offshore rock, 120
m (394 ft) NW (275  magnetic) from bench mark 5732 D 1999, 42 m (138 ft) NW (345
 magnetic) from bench mark 5732 B 1999, approximately 2 m (7 ft) below
vegetation line, and approximately 2 m (7 ft) above the apparent high water
line.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                                                
Station ID: 9455732                         PUBLICATION DATE:  08/28/2014
Name:       KALIGAN ISLAND (NORTH END),  COOK INLET           
            AK
NOAA Chart: 16662                           Latitude:   60° 30.7' N (  60.51170)
USGS Quad:  KENAI B-6                       Longitude: 151° 57.1' W (-151.95200)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  5732 D 1999
                         DESIGNATION:          945 5732 D

MONUMENTATION:           Bench Mark disk                       VM#:        15974
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Boulder                               OPUS PID:        
LATITUDE:   60° 30.5' N (  60.50830)          LONGITUDE: 151° 56.9' W (-151.94800)


The bench mark is a disk set in a boulder at the vegetation line on a pebble
beach, located directly inshore of a 6 m x 3 m (20 ft x 10 ft) boulder, 120 m
(394 ft) SE (095  magnetic) from bench mark 5732 C 1999, and approximately 3 m
(10 ft) above the apparent high water line.



                         BENCH MARK STAMPING:  5732 E 1999
                         DESIGNATION:          945 5732 E

MONUMENTATION:           Bench Mark disk                       VM#:        15975
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Boulder                               OPUS PID:        
LATITUDE:   60° 30.5' N (  60.50830)          LONGITUDE: 151° 56.9' W (-151.94800)


The bench mark is a disk set in a 2 m x 1 m (7 ft x 3 ft) boulder at the
vegetation line on the SE end of a rocky beach, 31 m (102 ft) SE (152  magnetic)
from bench mark 5732 A 1999, and approximately 3 m (10 ft) above the apparent
high water line.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                                                
Station ID: 9455732                         PUBLICATION DATE:  08/28/2014
Name:       KALIGAN ISLAND (NORTH END),  COOK INLET           
            AK
NOAA Chart: 16662                           Latitude:   60° 30.7' N (  60.51170)
USGS Quad:  KENAI B-6                       Longitude: 151° 57.1' W (-151.95200)


                            T I D A L   D A T U M S 


Tidal datums at KALIGAN ISLAND (NORTH END),  COOK INLET based on:

     LENGTH OF SERIES:      30 DAYS
     TIME PERIOD:           JULY 19, 1999 thru AUGUST 17, 1999
     TIDAL EPOCH:           2007-2011
     CONTROL TIDE STATION:  9455760 NIKISKI, COOK INLET


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     MEAN HIGHER HIGH WATER                     MHHW   =  5.717
     MEAN HIGH WATER                            MHW    =  5.486
     MEAN SEA LEVEL                             MSL    =  3.100
     MEAN TIDE LEVEL                            MTL    =  3.046
     MEAN LOW WATER                             MLW    =  0.607
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     5732 B 1999                                 9.145    3.659
     5732 A 1999                                 7.334    1.848
     5732 C 1999                                 8.236    2.750
     5732 D 1999                                 8.564    3.077
     5732 E 1999                                 7.948    2.461


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  5

                                                                                
Station ID: 9455732                         PUBLICATION DATE:  08/28/2014
Name:       KALIGAN ISLAND (NORTH END),  COOK INLET           
            AK
NOAA Chart: 16662                           Latitude:   60° 30.7' N (  60.51170)
USGS Quad:  KENAI B-6                       Longitude: 151° 57.1' W (-151.95200)


                             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.

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Products available at 9455732 KALIGAN ISLAND (NORTH END), COOK INLET, AK

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services