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Superseded Bench Mark Sheet for 9437262, NETARTS, NETARTS BAY OR

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                   PUBLICATION DATE:  07/27/1987
Station ID: 9437262                                SUPERCEDED DATE:   04/21/2003
Name:       NETARTS, NETARTS BAY                              
            OREGON
NOAA Chart: 18520                                  Latitude:         45° 25.8' N
USGS Quad:  TILLAMOOK                              Longitude:       123° 56.7' W


To reach the tidal bench marks from Netarts, proceed west on State Route 131
(Netarts/Oceanside Road) to the road leading to Tillamook County Park, go south
on the road to Bay Front Drive and the Tillamook County Boat Landing.  The bench
marks are located along Bay Front Drive and Route 131.  The tide gage and staff
were located on the Tillamook County boat dock.


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


                 PRIMARY BENCH MARK STAMPING:  943 7262 A 1977

MONUMENTATION:           Survey Disk                               VM#:     8854
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Unspecified Rod


The bench mark is 358 feet (109 m) WNW of Bench Mark NO STAMPING 1, 77 feet (23
m) NE of utility pole #BX81-L3-SP1, 20 feet (6 m) NE of the centerline of Bay
Front Drive, and 0.5 foot (0.2 m) south of a witness post.  The bench mark is
crimped to an unspecified rod driven 18 feet (5 m) to refusal, and encased in a
4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  943 7262 B 1977

MONUMENTATION:           Survey Disk                               VM#:     8855
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Unspecified Rod


The bench mark is 50.5 feet (15.4 m) south of the centerline of Route 131, 45.5
feet (13.9 m) NW of utility pole #BX81, 21 feet (6 m) west of the centerline of
the road leading to Tillamook County Park, 13.0 feet (4.0 m) west of the
schooner (Captains Room) sign, and 0.5 foot (0.2 m) south of a witness post. 
The bench mark is crimped to an unspecified rod driven 44 feet (13 m) to
refusal, and encased in a 4-inch PVC pipe and concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                   PUBLICATION DATE:  07/27/1987
Station ID: 9437262                                SUPERCEDED DATE:   04/21/2003
Name:       NETARTS, NETARTS BAY                              
            OREGON
NOAA Chart: 18520                                  Latitude:         45° 25.8' N
USGS Quad:  TILLAMOOK                              Longitude:       123° 56.7' W


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


                         BENCH MARK STAMPING:  943 7262 C 1977

MONUMENTATION:           Survey Disk                               VM#:     8856
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Unspecified Rod


The bench mark is 38 feet (12 m) north of the centerline of Route 131, 33.0 feet
(10.1 m) west of an unnumbered utility pole, 14.5 feet (4.4 m) west of the
centerline of Silven Sand Road, and 0.5 foot (0.2 m) south of a witness post. 
The bench mark is crimped to an unspecified rod driven 18 feet (5 m) to refusal,
and encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  NO STAMPING 1

MONUMENTATION:           Survey Disk                               VM#:     8857
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Curb


The bench mark is set flush in the eastern concrete curb at the Tillamook Boat
Landing launching ramp, 20.5 feet (6.2 m) west of the NW corner of the restroom
building, and 9 feet (3 m) south of the north end of the curb.



                         BENCH MARK STAMPING:  NO STAMPING 2

MONUMENTATION:           Survey Disk                               VM#:     8858
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Bronze Steel Rod


The bench mark is 3 feet (1 m) SW of the center of a pole supporting the
Tillamook Boat Landing sign, and 1.5 feet (0.5 m) SW of the SW edge of the
concrete sign base.  The bench mark is a yellow plastic mark crimped to a bronze
water steel rod driven 3 feet (1 m) into the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                   PUBLICATION DATE:  07/27/1987
Station ID: 9437262                                SUPERCEDED DATE:   04/21/2003
Name:       NETARTS, NETARTS BAY                              
            OREGON
NOAA Chart: 18520                                  Latitude:         45° 25.8' N
USGS Quad:  TILLAMOOK                              Longitude:       123° 56.7' W


                            T I D A L   D A T U M S 


Tidal datums at NETARTS, NETARTS BAY based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           SEPTEMBER-NOVEMBER 1979
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  9440910 TOKE POINT, WA


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

     HIGHEST OBSERVED WATER LEVEL (12/22/1977)         =  11.54
     MEAN HIGHER HIGH WATER                     MHHW   =   6.76
     MEAN HIGH WATER                            MHW    =   6.01
     MEAN TIDE LEVEL                            MTL    =   3.51
     MEAN LOW WATER                             MLW    =   1.01
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (07/31/1977)         =  -1.78



Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     943 7262 A 1977                            15.99      9.98
     943 7262 B 1977                            40.75     34.74
     943 7262 C 1977                            43.50     37.49
     NO STAMPING 1                              10.83      4.82
     NO STAMPING 2                              15.83      9.82


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

                                                   PUBLICATION DATE:  07/27/1987
Station ID: 9437262                                SUPERCEDED DATE:   04/21/2003
Name:       NETARTS, NETARTS BAY                              
            OREGON
NOAA Chart: 18520                                  Latitude:         45° 25.8' N
USGS Quad:  TILLAMOOK                              Longitude:       123° 56.7' W


                             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 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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Revised: 08/08/2018
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