Bench Mark Sheet for 9468863, ELIM, NORTON 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 9468863                         PUBLICATION DATE:  12/09/2019
Name:       ELIM, NORTON BAY                                  
            AK
NOAA Chart: 16200                           Latitude:   64° 37.0' N (  64.61670)
USGS Quad:  SOLOMON C-1                     Longitude: 162° 14.9' W (-162.24800)


To reach the tidal bench marks:  at the NW side of Norton Bay, 177 km (110 mi)
east of Nome and 119 km (74 mi) NW of Unalakeet, at Elim and Elim Creek.  The
gage site is located adjacent to the tide observers dwelling and 61 m (200 ft)
from LW.  The bench marks are in the near area.


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


                 PRIMARY BENCH MARK STAMPING:  8863 G 1984
                         DESIGNATION:          946 8863 G

MONUMENTATION:           Survey disk                           VM#:        15409
AGENCY:                  AKDNR                                 IDB PID:         
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID:        
LATITUDE:   64° 37.0' N (  64.61656)          LONGITUDE: 162° 15.3' W (-162.25469)


The bench mark is a disk set in the concrete footing of the footbridge over Elim
creek, 38.74 m (127.1 ft) SSE from utility pole b9, 9.63 m (31.6 ft) south of
the SW corner of the NW wood pillar bridge support across Elim creek, 5.32 m
(17.5 ft) SW of the bottom center of the 3.0 m (9.8 ft) Elim creek drainage
culvert, 0.17 m (0.6 ft) east of the SW corner of the wood pillar with witness
sign and 1.71 m (5.6 ft) below metal state of Alaska survey monument witness
sign.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 9468863                         PUBLICATION DATE:  12/09/2019
Name:       ELIM, NORTON BAY                                  
            AK
NOAA Chart: 16200                           Latitude:   64° 37.0' N (  64.61670)
USGS Quad:  SOLOMON C-1                     Longitude: 162° 14.9' W (-162.24800)


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


                         BENCH MARK STAMPING:  8863 J 2012
                         DESIGNATION:          946 8863 J

MONUMENTATION:           Bench Mark disk                       VM#:        23078
AGENCY:                  National Ocean Service                IDB PID:         
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID#: BBFB43
LATITUDE:   64° 37.0' N (  64.61669)          LONGITUDE: 162° 15.3' W (-162.25469)


The bench mark is a disk set on a 6.30 m (20.7 ft) x 2.75 m (9.0 ft) x 0.40 m
(1.3 ft) high bedrock protrusion with a north-south orientation, 123.1 m (403.9
ft) NE of bench mark 946 8863 B reset, 59.33 m (194.7 ft) ENE of bench mark 946
8863 H, 8.45 m (27.7 ft) ENE of a prominent bluff outcrop with a north-south
orientation, 5.54 m (18.2 ft) south of the base of the bluff running parallel to
the shoreline, 1.92 m (6.3 ft) north of an old drill hole, 0.61 m (2.0 ft) SSW
of an iron pipe remains approximately 1 inch in diameter and cemented flush with
the bedrock and 0.31 m (1.0 ft) east of the bedrock s edge.



                         BENCH MARK STAMPING:  8863 H 2012
                         DESIGNATION:          946 8863 H

MONUMENTATION:           Bench Mark disk                       VM#:        23079
AGENCY:                  National Ocean Service                IDB PID:         
SETTING CLASSIFICATION:  Boulder                               OPUS PID:        
LATITUDE:   64° 37.0' N (  64.61667)          LONGITUDE: 162° 14.9' W (-162.24856)


The bench mark is a disk set on a 7.0 m (23.0 ft) x 3.3 m (10.8 ft) x 1.6 m (5.2
ft) high bedrock protrusion with a NNE-SSW orientation, 59.33 m (194.7 ft) WSW
of bench mark 946 8863 J, 4.79 m (15.7 ft) NNW of the edge of an approximately
15 m (49.2 ft) high bluff running parallel to the shoreline, 4.15 m (13.6 ft)
south of a seaward most point of a bedrock protrusion, 0.45 m (1.5 ft) south of
the highest point of the bedrock s edge, 0.35 m (1.1 ft) east of the highest
point of the bedrock s edge and 0.20 m (0.7 ft) south of an old drill hole.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 9468863                         PUBLICATION DATE:  12/09/2019
Name:       ELIM, NORTON BAY                                  
            AK
NOAA Chart: 16200                           Latitude:   64° 37.0' N (  64.61670)
USGS Quad:  SOLOMON C-1                     Longitude: 162° 14.9' W (-162.24800)


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


                         BENCH MARK STAMPING:  BM 8863 B RESET 2001
                         DESIGNATION:          946 8863 B RESET

MONUMENTATION:           Tidal Station disk                    VM#:        23080
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  DF3658
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID#: DF3658
LATITUDE:   64° 37.0' N (  64.61644)          LONGITUDE: 162° 15.1' W (-162.25225)


The bench mark is a disk set on a 4.1 m (13.5 ft) x 2.4 m (7.9 ft) x 0.5 m (1.6
ft) high bedrock protrusion with a NNE - SSW orientation, 123.1 m (403.9 ft) SW
of bench mark 946 8863 J, 52.47 m (172.1 ft) ESEof the SE edge of a new white
vinyl-sided house on the bluff running parallel to the shoreline, 29.45 m (96.6
ft) SSE of the western edge of a faded red plywood-sided house, 10.98 m (36.0
ft) SSW of bench mark 946 8863 ELI TIDAL GPS, 2.73 m (9.0 ft) SSE of the
bedrocks northern edge and 0.41 m (1.3 ft) SW of the bedrocks western edge.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 9468863                         PUBLICATION DATE:  12/09/2019
Name:       ELIM, NORTON BAY                                  
            AK
NOAA Chart: 16200                           Latitude:   64° 37.0' N (  64.61670)
USGS Quad:  SOLOMON C-1                     Longitude: 162° 14.9' W (-162.24800)


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


                         BENCH MARK STAMPING:  ELI TIDAL GPS 2001
                         DESIGNATION:          ELI TIDAL GPS

MONUMENTATION:           Tidal Station disk                    VM#:        23081
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  DF3657
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID#: DF3657
LATITUDE:   64° 37.0' N (  64.61653)          LONGITUDE: 162° 15.1' W (-162.25211)


The bench mark is a disk set on a 11.80 m (38.7 ft) x 2.80 m (9.2 ft) x 2.6 m
(8.5 ft) high bedrock protrusion with a NNE-SSW orientation, 236.5 m (775.9 ft)
ENE of bench mark 946 8863 G, 53.81 m (176.5 ft) east of the SE edge of a new
white vinyl-sided house on the bluff running parallel to the shoreline, 21.65 m
(71.0 ft) SE of the western edge of a faded red plywood-sided house, 10.98 m
(36.0 ft) NNE of bench mark 946 8863 B RESET, 2.41 m (7.9 ft) SSW of the
bedrocks northern edge and 0.98 m (3.2 ft) WNW of the bedrocks southern edge.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 9468863                         PUBLICATION DATE:  12/09/2019
Name:       ELIM, NORTON BAY                                  
            AK
NOAA Chart: 16200                           Latitude:   64° 37.0' N (  64.61670)
USGS Quad:  SOLOMON C-1                     Longitude: 162° 14.9' W (-162.24800)


                            T I D A L   D A T U M S 


Tidal datums at ELIM, NORTON BAY based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           Sep  1 2012 - Sep 30 2012
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9468756 NOME, NORTON SOUND


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.799
     MEAN HIGH WATER                            MHW    =  0.719
     MEAN TIDE LEVEL                            MTL    =  0.442
     MEAN SEA LEVEL                             MSL    =  0.389
     MEAN LOW WATER                             MLW    =  0.165
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     North American Vertical Datum              NAVD88 = -0.782

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     8863 G 1984                                 2.391    1.672
     8863 J 2012                                 2.857    2.138
     8863 H 2012                                 3.153    2.434
     BM 8863 B RESET 2001                        2.785    2.066
     ELI TIDAL GPS 2001                          5.067    4.348


Foot Notes:

Data from this station was collected using methodology that does not meet CO-OPS
highest level of accuracy (no more than 10 cm, 95% Confidence Interval (CI)
referenced to a tidal datum). Recognizing that lower quality data can be used
for certain applications CO-OPS is making this data available to its users with
restraint. The average six-minute water level observations derived from this
system have an accuracy ranging from 10.0 - 30.0 cm, 95% CI on datum. Users are
cautioned to consider the accuracy of these data before using them for critical
navigational or coastal engineering purposes.

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

                                                                                
Station ID: 9468863                         PUBLICATION DATE:  12/09/2019
Name:       ELIM, NORTON BAY                                  
            AK
NOAA Chart: 16200                           Latitude:   64° 37.0' N (  64.61670)
USGS Quad:  SOLOMON C-1                     Longitude: 162° 14.9' W (-162.24800)


                             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.

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