Bench Mark Sheet for 9462450, Nikolski 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  9

                                                                                
Station ID: 9462450                         PUBLICATION DATE:  09/25/2017
Name:       NIKOLSKI                                          
            AK
NOAA Chart: 16511                           Latitude:   52° 56.4' N (  52.94061)
USGS Quad:  SAMALGA ISLAND D-3              Longitude: 168° 52.3' W (-168.87131)


To reach the tidal bench marks from the airport, proceed 300 m (984 ft) SW to
the second road intersection from the airport, then NW 130 m (427 ft) to the
next intersection and the school on the right, then SW 200 m (656 ft) past the
Orthodox Church on the left to the bridge which crosses a stream, then continue
along the road NW 0.8 km (0.5 mi) to the station on the left.  The bench marks
are along the road from the Orthodox Church past the dump.  The tide gauges are
housed in the 3.7 m x 5 m x 3 m (12.1 ft x 16 ft x 10 ft) high plywood building
3 m (10 ft) west of the road.


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


                 PRIMARY BENCH MARK STAMPING:  2450 F 2006
                         DESIGNATION:          946 2450 F

MONUMENTATION:           Tidal Station disk                    VM#:        18126
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: BBFM08
LATITUDE:   52° 56.4' N (  52.93919)          LONGITUDE: 168° 52.3' W (-168.87122)


The primary bench mark is set on a small ridge between the gravel road and the
hill which is west of the tide house, 157.8 m (517.7 ft) south of bench mark 946
2450 E, 149.1 m (489.2 ft) WNW of bench mark 946 2450 G, 8.90 m (29.2 ft) WSW of
the centerline of the road, 1.35 m (4.4 ft) NW of the 4-strand barbed-wire
fence, and 1.40 m (4.6 ft) above the road. The bench mark is set 14 cm (0.5 ft)
below ground, being the top of a stainless steel rod driven 4.9 m (16.1 ft) to
refusal, and encased in a 0.13 m (0.4 ft) diameter x 0.11 m (0.4 ft) high PVC
pipe.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  9

                                                                                
Station ID: 9462450                         PUBLICATION DATE:  09/25/2017
Name:       NIKOLSKI                                          
            AK
NOAA Chart: 16511                           Latitude:   52° 56.4' N (  52.94061)
USGS Quad:  SAMALGA ISLAND D-3              Longitude: 168° 52.3' W (-168.87131)


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


                         BENCH MARK STAMPING:  2450 E 2006
                         DESIGNATION:          945 2450 E

MONUMENTATION:           Tidal Station disk                    VM#:        18127
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: BBFM12
LATITUDE:   52° 56.4' N (  52.94061)          LONGITUDE: 168° 52.3' W (-168.87131)


The bench mark is set at the base of a bluff, 187.91 m (616.5 ft) SSE of bench
mark 946 2450 D, 157.80 m (517.7 ft) north of bench mark 946 2450 F, 21.00 m
(68.9 ft) west of the NW corner of the marine railway, 12.10 m (39.7 ft) south
of the SW corner of the 3.70 m x 5.00 m x 3 m (12.1 ft x 16.4 ft x 10 ft) high
tide house, and 12.00 m (39.4 ft) west of the centerline of the road. The bench
mark is set 0.14 m (0.5 ft) below ground, being the top of a stainless steel rod
driven 2.40 m (7.9 ft) to refusal, and encased in a 0.12 m (0.4 ft) diameter x
0.11 m (0.4 ft) high PVC pipe.



                         BENCH MARK STAMPING:  2450 G 2006
                         DESIGNATION:          945 2450 G TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        18128
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Bedrock outcrop                       OPUS PID#: BBFM14
LATITUDE:   52° 56.3' N (  52.93891)          LONGITUDE: 168° 52.1' W (-168.86905)


The bench mark is set flush near the SW corner of a lightly vegetated bedrock
outcrop on the east end of a point of land NW of the village of Nikolski, 206.70
m (678.1 ft) west of benchmark 946 2450 H, 149.1 m (489.2 ft) ESE of bench mark
946 2450 F, and 25.50 m (83.7 ft) slope distance east of the centerline of the
road.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  9

                                                                                
Station ID: 9462450                         PUBLICATION DATE:  09/25/2017
Name:       NIKOLSKI                                          
            AK
NOAA Chart: 16511                           Latitude:   52° 56.4' N (  52.94061)
USGS Quad:  SAMALGA ISLAND D-3              Longitude: 168° 52.3' W (-168.87131)


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


                         BENCH MARK STAMPING:  2450 H 2006
                         DESIGNATION:          946 2450 H

MONUMENTATION:           Tidal Station disk                    VM#:        18129
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID#: BBFM13
LATITUDE:   52° 56.3' N (  52.93872)          LONGITUDE: 168° 52.0' W (-168.86599)


The bench mark is set flush in a rock outcrop, 206.70 m (678.1 ft) east of
benchmark 946 2450 G, 140.1 m (459.6 ft) WNW of bench mark 946 2450 ASTRO RM 2,
35.00 m (114.8 ft) north of the NE corner of an old multi-colored pole barn, and
11.20 m (36.7 ft) NE of the NE edge of a 0.75 m x 0.60 m x 0.20 m (2.5 ft x 2.0
ft x 0.7 ft) high concrete block just below the debris line which supports the
NE side of two wooden rails.



                         BENCH MARK STAMPING:  2450 D 2006
                         DESIGNATION:          946 2450 D

MONUMENTATION:           Tidal Station disk                    VM#:        18130
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Bedrock                               OPUS PID#: BBFS16
LATITUDE:   52° 56.5' N (  52.94204)          LONGITUDE: 168° 52.4' W (-168.87278)


The bench mark is set flush in bedrock NW of the village of Nikolski, 187.91 m
(616.5 ft) NNW of bench mark 946 2450 E, 107.7 m (353.3 ft) ESE of bench mark
946 2450 C, 45.00 m (147.6 ft) north of the centerline of the road leading to
the dump at the end of the road, and 5 m (16 ft) north from the base of the
gravel pad.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  9

                                                                                
Station ID: 9462450                         PUBLICATION DATE:  09/25/2017
Name:       NIKOLSKI                                          
            AK
NOAA Chart: 16511                           Latitude:   52° 56.4' N (  52.94061)
USGS Quad:  SAMALGA ISLAND D-3              Longitude: 168° 52.3' W (-168.87131)


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


                         BENCH MARK STAMPING:  2450 C 2006
                         DESIGNATION:          946 2450 C

MONUMENTATION:           Tidal Station disk                    VM#:        18131
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Bedrock                               OPUS PID#: BBFS21
LATITUDE:   52° 56.5' N (  52.94239)          LONGITUDE: 168° 52.5' W (-168.87428)


The bench mark is set flush in bedrock NW of the village of Nikolski, WNW of the
Russian Orthodox Church, 245.30 m (804.8 ft) ESE of bench mark 946 2450 SAR,
107.70 m (353.3 ft) WNW of bench mark 946 2450 D, and 72.85 m (239.0 ft) ENE of
bench mark 946 2450 B.



                         BENCH MARK STAMPING:  2450 B 2006
                         DESIGNATION:          946 2450 B

MONUMENTATION:           Tidal Station disk                    VM#:        18132
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Bedrock                               OPUS PID#: BBFM11
LATITUDE:   52° 56.5' N (  52.94226)          LONGITUDE: 168° 52.5' W (-168.87534)


The bench mark is set flush in bedrock NW of the village of Nikolski, 182.90 m
(600.1 ft) ESE of bench mark 946 2450 SAR, 116.50 m (382.2 ft) east of bench
mark 946 2450 A, and 72.85 m (239.0 ft) WSW of bench mark 946 2450 C.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  9

                                                                                
Station ID: 9462450                         PUBLICATION DATE:  09/25/2017
Name:       NIKOLSKI                                          
            AK
NOAA Chart: 16511                           Latitude:   52° 56.4' N (  52.94061)
USGS Quad:  SAMALGA ISLAND D-3              Longitude: 168° 52.3' W (-168.87131)


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


                         BENCH MARK STAMPING:  2450 A 2006
                         DESIGNATION:          946 2450 A

MONUMENTATION:           Tidal Station disk                    VM#:        18133
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Bedrock                               OPUS PID:        
LATITUDE:   52° 56.5' N (  52.94223)          LONGITUDE: 168° 52.6' W (-168.87707)


The bench mark is set flush in the base of the highest rock promontory NW of the
village of Nikolski, 116.50 m (382.2 ft) west of bench mark 946 2450 B, 93.00 m
(305.1 ft) SE of bench mark 946 2450 SAR, 84.96 m (278.7 ft) SE of bench mark
946 2450 SAR RM, and 1.00 m (3.2 ft) above ground.



                         BENCH MARK STAMPING:  2450 SAR RM
                         DESIGNATION:          946 2450 SAR RM

MONUMENTATION:           Tidal Station disk                    VM#:        18134
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   52° 56.6' N (  52.94282)          LONGITUDE: 168° 52.7' W (-168.87787)


The bench mark is set flush in a rock outcrop NW of the village of Nikolski,
84.96 m (278.7 ft) NW of bench mark 946 2450 A and 12.47 m (40.9 ft) SSW of
bench mark 946 2450 SAR 1925.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  9

                                                                                
Station ID: 9462450                         PUBLICATION DATE:  09/25/2017
Name:       NIKOLSKI                                          
            AK
NOAA Chart: 16511                           Latitude:   52° 56.4' N (  52.94061)
USGS Quad:  SAMALGA ISLAND D-3              Longitude: 168° 52.3' W (-168.87131)


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


                         BENCH MARK STAMPING:  2450 SAR 1925
                         DESIGNATION:          946 2450 SAR

MONUMENTATION:           Tidal Station disk                    VM#:        18135
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID#: UV9052
LATITUDE:   52° 56.6' N (  52.94293)          LONGITUDE: 168° 52.7' W (-168.87782)


The bench mark is a disk set flush in a rock outcrop NW of the village of
Nikolski, 245.30 m (804.8 ft) WNW of bench mark 946 2450 C, 182.9 m (600.1 ft)
WNW of bench mark 946 2450 B, 93.00 m (305.1 ft) NW of bench mark 946 2450 A,
12.47 m (40.9 ft) NNE of bench mark 946 2450 SAR RM, 1.50 m (4.9 ft) WSW of the
top of the rock outcrop, and 0.80 m (2.6 ft) below the top of the rock outcrop.



                         BENCH MARK STAMPING:  2450 ASTRO
                         DESIGNATION:          946 2450 ASTRO

MONUMENTATION:           Triangulation Station disk            VM#:        18137
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Concrete block                        OPUS PID#: UV9037
LATITUDE:   52° 56.3' N (  52.93819)          LONGITUDE: 168° 51.8' W (-168.86398)


The bench mark is set flush in a 0.30 m (1.0 ft) diameter concrete block set
atop a hill due west of the Russian Orthodox Church, 66.00 m (216.5 ft) NW of
the wooden cross memorial for the "First Orthodox Church in Alaska", 29.50 m
(96.8 ft) SE of the SE corner of a single story abandoned green home, 9.49 m
(31.1 ft) ENE of bench mark 946 2450 ASTRO RM 2, and 1.00 m (3.2 ft) north of
the the centerline of an ATV trail.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  9

                                                                                
Station ID: 9462450                         PUBLICATION DATE:  09/25/2017
Name:       NIKOLSKI                                          
            AK
NOAA Chart: 16511                           Latitude:   52° 56.4' N (  52.94061)
USGS Quad:  SAMALGA ISLAND D-3              Longitude: 168° 52.3' W (-168.87131)


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


                         BENCH MARK STAMPING:  ASTRO RM 2 1937
                         DESIGNATION:          946 2450 ASTRO RM 2

MONUMENTATION:           Tidal Station disk                    VM#:        18806
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Concrete block                        OPUS PID:        
LATITUDE:   52° 56.3' N (  52.93817)          LONGITUDE: 168° 51.8' W (-168.86412)


The bench mark is set flush in a 0.30 m x 0.30 m (1.0 ft x 1.0 ft) concrete
block set atop a hill due west of the Russian Orthodox Church, 140.1 m (459.6
ft) ESE of bench mark 946 2450 H, 71.00 m (232.9 ft) NW of the wooden cross
memorial for the "First Orthodox Church in Alaska", 23.50 m (77.1 ft) SE of the
SE corner of a single story abandoned green home, 9.49 m (31.1 ft) WSW of bench
mark 946 2450 ASTRO, and 1.20 m (3.9 ft) north of the centerline of an ATV
trail.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  9

                                                                                
Station ID: 9462450                         PUBLICATION DATE:  09/25/2017
Name:       NIKOLSKI                                          
            AK
NOAA Chart: 16511                           Latitude:   52° 56.4' N (  52.94061)
USGS Quad:  SAMALGA ISLAND D-3              Longitude: 168° 52.3' W (-168.87131)


                            T I D A L   D A T U M S 


Tidal datums at NIKOLSKI based on:

     LENGTH OF SERIES:      7 YEARS
     TIME PERIOD:           12/08-11/09, 8/10-7/12, 1/13-12/16
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9462620 UNALASKA, DUTCH HARBOR


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

     HIGHEST OBSERVED WATER LEVEL (12/08/2012)         =  1.940
     MEAN HIGHER HIGH WATER                     MHHW   =  1.212
     MEAN HIGH WATER                            MHW    =  1.110
     MEAN TIDE LEVEL                            MTL    =  0.704
     MEAN SEA LEVEL                             MSL    =  0.691
     MEAN LOW WATER                             MLW    =  0.298
     North American Vertical Datum              NAVD88 =  0.178
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (12/13/2008)         = -0.872

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     2450 F 2006                                 6.534    5.424
     2450 E 2006                                 5.799    4.689
     2450 G 2006                                 1.681    0.571
     2450 H 2006                                 1.553    0.443
     2450 D 2006                                 1.400    0.290
     2450 C 2006                                 2.295    1.185
     2450 B 2006                                 2.643    1.533
     2450 A 2006                                 2.687    1.577
     2450 SAR RM                                 4.778    3.668
     2450 SAR 1925                               4.744    3.634
     2450 ASTRO                                 10.909    9.799
     ASTRO RM 2 1937                            11.177   10.067


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  9 of  9

                                                                                
Station ID: 9462450                         PUBLICATION DATE:  09/25/2017
Name:       NIKOLSKI                                          
            AK
NOAA Chart: 16511                           Latitude:   52° 56.4' N (  52.94061)
USGS Quad:  SAMALGA ISLAND D-3              Longitude: 168° 52.3' W (-168.87131)


                             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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