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Bench Mark Sheet for 9455159, CRATER BAY, HARRIS BAY 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 9455159                         PUBLICATION DATE:  04/21/2003
Name:       CRATER BAY                                        
            AK
NOAA Chart: 16682                           Latitude:   59° 42.8' N (  59.71330)
USGS Quad:  BLYING SOUND (D-8)              Longitude: 149° 47.2' W (-149.78700)


To reach the tidal benchmarks from Seward via boat, proceed 15 km (8 nm) SSE
along Resurrection Bay to Calisto Head, then 32.5 km (17.6 nm) south along
Resurrection Bay to Aialik Cape, then 9.1 km (4.9 nm) west across Aialik Bay to
the axis of Aialik Bay north of Harbor Island, then 10.4 km (5.6 nm)  SSW to the
center of the passage between Aligo Point and the southern tip of Granite
Island, then 9.5 km (5.1 nm) NW along Granite Passage, then 4.0 km (2.2 nm) NE
along Crater Bay to the tide station. The benchmarks are located along the
shoreline. The tide station was located on the hillside in the trees above bench
mark 9455159 B 2000.


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


                 PRIMARY BENCH MARK STAMPING:  9455159 B 2000
                         DESIGNATION:          945 5159 B

MONUMENTATION:           Tidal Station disk                    VM#:        16384
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   59° 42.8' N (  59.71330)          LONGITUDE: 149° 47.0' W (-149.78300)


The primary benchmark is set in a large rock outcropping which produces a small
point on the NE side of Crater Bay, 79 m (259 ft) west of benchmark 9455159 A
2000, 24 m (79 ft) south of benchmark 9455159 C 2000, 4 m (12 ft) from the
apparent  high water line, 2 m (8 ft) from the edge of the vegetation, and 1 m
(4 ft) below the vegetation line.

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

                                                                                
Station ID: 9455159                         PUBLICATION DATE:  04/21/2003
Name:       CRATER BAY                                        
            AK
NOAA Chart: 16682                           Latitude:   59° 42.8' N (  59.71330)
USGS Quad:  BLYING SOUND (D-8)              Longitude: 149° 47.2' W (-149.78700)


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


                         BENCH MARK STAMPING:  9455159 A 2000
                         DESIGNATION:          945 5159 A

MONUMENTATION:           Tidal Station disk                    VM#:        16383
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   59° 42.8' N (  59.71330)          LONGITUDE: 149° 47.0' W (-149.78300)


The benchmark is set in a large sloping rock outcrop, 79 m (259 ft) east of
benchmark 9455159 B 2000, 1 m (3 ft) from the apparent high water line, 0.3 m (1
ft) from the edge of the rock, and 2 m (5 ft) below the vegetation line.



                         BENCH MARK STAMPING:  9455159 C 2000
                         DESIGNATION:          945 5159 C

MONUMENTATION:           Tidal Station disk                    VM#:        16389
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   59° 42.8' N (  59.71330)          LONGITUDE: 149° 47.1' W (-149.78500)


The benchmark is set in a 5 m x 2 m (15 ft x 5 ft) sloping rock outcrop, 24 m
(79 ft) north of benchmark 9455159 B 2000, 16 m (52 ft) SE of benchmark 9455159
D 2000, 0.3 m (1 ft) from the edge of the outdrop, and 2 m (5 ft) below the
vegetation line.  

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

                                                                                
Station ID: 9455159                         PUBLICATION DATE:  04/21/2003
Name:       CRATER BAY                                        
            AK
NOAA Chart: 16682                           Latitude:   59° 42.8' N (  59.71330)
USGS Quad:  BLYING SOUND (D-8)              Longitude: 149° 47.2' W (-149.78700)


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


                         BENCH MARK STAMPING:  9455159 D 2000
                         DESIGNATION:          945 5159 D

MONUMENTATION:           Tidal Station disk                    VM#:        16390
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Boulder                               OPUS PID:        
LATITUDE:   59° 42.8' N (  59.71330)          LONGITUDE: 149° 47.1' W (-149.78500)


The benchmark is set in a 9 m x 2 m x 3 m (30 ft x 8 ft x 10 ft) high boulder,
23 m (75 ft) SE of benchmark 9455159 E 2000, 16 m (52 ft) NW of benchmark
9455159 C 2000, 6 m (20 ft) from the apparent high water line, 2 m (8 ft) from
the vegetation line, and 2 m (5 ft) below the vegetation line.



                         BENCH MARK STAMPING:  9455159 E 2000
                         DESIGNATION:          945 5159 E

MONUMENTATION:           Tidal Station disk                    VM#:        16391
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Boulder                               OPUS PID:        
LATITUDE:   59° 42.8' N (  59.71330)          LONGITUDE: 149° 47.1' W (-149.78500)


The benchmark is set in a small boulder point, 23 m (75 m) NW of benchmark
9455159 D 2000, 2 m (6 ft) SW of the base of a 5 m x 3 m x 3 m (15 ft x 10 ft x
10 ft) high boulder, and 2 m (6 ft) from the edge of the apparent high water
line.  

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

                                                                                
Station ID: 9455159                         PUBLICATION DATE:  04/21/2003
Name:       CRATER BAY                                        
            AK
NOAA Chart: 16682                           Latitude:   59° 42.8' N (  59.71330)
USGS Quad:  BLYING SOUND (D-8)              Longitude: 149° 47.2' W (-149.78700)


                            T I D A L   D A T U M S 


Tidal datums at CRATER BAY based on:

     LENGTH OF SERIES:      3 Months
     TIME PERIOD:           August 2000 - October 2000
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9455090 SEWARD, RESURRECTION BAY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  3.266
     MEAN HIGH WATER                            MHW    =  2.988
     MEAN SEA LEVEL                             MSL    =  1.698
     MEAN TIDE LEVEL                            MTL    =  1.694
     MEAN LOW WATER                             MLW    =  0.400
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     9455159 B 2000                              3.294    0.306
     9455159 A 2000                              4.030    1.042
     9455159 C 2000                              4.372    1.384
     9455159 D 2000                              4.857    1.869
     9455159 E 2000                              3.032    0.044


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

                                                                                
Station ID: 9455159                         PUBLICATION DATE:  04/21/2003
Name:       CRATER BAY                                        
            AK
NOAA Chart: 16682                           Latitude:   59° 42.8' N (  59.71330)
USGS Quad:  BLYING SOUND (D-8)              Longitude: 149° 47.2' W (-149.78700)


                             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 9455159 CRATER BAY, HARRIS BAY, AK

Revised: 10/15/2013
NOAA / National Ocean Service
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