Superseded Bench Mark Sheet for 9435385, YAQUINA USCG STA, NEWPORT

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:  08/11/1988
Station ID: 9435385                                SUPERCEDED DATE:   04/21/2003
Name:       NEWPORT,  YAQUINA BAY                             
            OREGON
NOAA Chart: 18581                                  Latitude:         44° 37.6' N
USGS Quad:  YAQUINA                                Longitude:       124°  3.3' W


To reach the tidal bench marks from Yaquina Coast Guard Station in Newport,
proceed SE on SW Bay Street for 0.05 mile (0.08 km) to Cape Perpetua Seafoods
Company at the intersection of SW Bay Street and SW Bay Boulevard.  The bench
marks are near the Coast Guard Station.  The tide gage and staff were located on
the Cape Perpetua Seafoods Company pier adjacent to the southernmost of the
processing buildings.


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


                 PRIMARY BENCH MARK STAMPING:  T 117 1941

MONUMENTATION:           Survey Disk                               VM#:     8838
AGENCY:                                                            PID#:  QE1204
SETTING CLASSIFICATION:  Concrete Sidewalk


The bench mark is set flush in the sidewalk on the northernmost corner of the
intersection of SW Bay Boulevard and SW Case Street, 32.0 feet (9.8 m) NE of the
centerline of SW Case Street, 26.0 feet (7.9 m) NW of the centerline of SW Bay
Boulevard, and 5.0 feet (1.5 m) SW of a fire hydrant on the NW side of SW Bay
Boulevard.



                         BENCH MARK STAMPING:  2 1914

MONUMENTATION:           Survey Disk                               VM#:     8835
AGENCY:                                                            PID#:  QE1203
SETTING CLASSIFICATION:  Concrete Curb


The bench mark is at the northernmost corner of the intersection of SW Bay
Street and SW Bay Boulevard, 41.0 feet (12.5 m) NE of the centerline of SW Bay
Street, 27.0 feet (8.2 m) NW of the centerline of SW Bay Boulevard, and level
with the surface of the sidewalk.  Note:  The stamping is worn and now reads 2
1.

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

                                                   PUBLICATION DATE:  08/11/1988
Station ID: 9435385                                SUPERCEDED DATE:   04/21/2003
Name:       NEWPORT,  YAQUINA BAY                             
            OREGON
NOAA Chart: 18581                                  Latitude:         44° 37.6' N
USGS Quad:  YAQUINA                                Longitude:       124°  3.3' W


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


                         BENCH MARK STAMPING:  F 80 1933

MONUMENTATION:           Survey Disk                               VM#:     8836
AGENCY:                                                            PID#:  QE1205
SETTING CLASSIFICATION:  Concrete Sidewalk


The bench mark is set flush in the sidewalk at the northernmost corner of the
intersection of SW Bay Boulevard and SW Abby Street, 45.0 feet (13.7 m) NE of
the centerline of SW Abby Street, and 23.0 feet (7.0 m) NW of the centerline of
SW Bay Boulevard.  Note:  The mark is worn and no stamping remains.



                         BENCH MARK STAMPING:  Y 1 1936

MONUMENTATION:           Survey Disk                               VM#:     8837
AGENCY:                                                            PID#:  QE1210
SETTING CLASSIFICATION:  Concrete Sidewalk


The bench mark is set flush in the NE sidewalk at the north end of the Yaquina
Bay Bridge (U.S. Highway 101) on the NW-SE centerline of the sidewalk adjacent
to the roadbed, 65.0 feet (19.8 m) NW of the northernmost pair of bridge pylons,
and 16.0 feet (4.9 m) from the centerline of U.S. Highway 101.



                         BENCH MARK STAMPING:  YB 32 1967

MONUMENTATION:           Survey Disk                               VM#:     8839
AGENCY:                                                            PID#:  QE2626
SETTING CLASSIFICATION:  Concrete Sidewalk


The bench mark is set flush in the SW sidewalk on the landing at the north end
of Yaquina Bay Bridge (U.S. Highway 101), 65.0 feet (19.8 m) NW of the
northernmost pair of bridge pylons, and 25.0 feet (7.6 m) SW of the centerline
of U.S. Highway 101.

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

                                                   PUBLICATION DATE:  08/11/1988
Station ID: 9435385                                SUPERCEDED DATE:   04/21/2003
Name:       NEWPORT,  YAQUINA BAY                             
            OREGON
NOAA Chart: 18581                                  Latitude:         44° 37.6' N
USGS Quad:  YAQUINA                                Longitude:       124°  3.3' W


                            T I D A L   D A T U M S 


Tidal datums at NEWPORT,  YAQUINA BAY based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           NOVEMBER 1982
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  9435380 SOUTH BEACH


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

     HIGHEST OBSERVED WATER LEVEL (11/30/1982)         =  11.33
     MEAN HIGHER HIGH WATER                     MHHW   =   8.32
     MEAN HIGH WATER                            MHW    =   7.63
     MEAN TIDE LEVEL                            MTL    =   4.50
     MEAN LOW WATER                             MLW    =   1.37
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (12/01/1982)         =  -1.50

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     T 117 1941                                 19.19     11.56
     2 1914                                     18.49     10.86
     F 80 1933                                  19.76     12.13
     Y 1 1936                                   122.26    114.63
     YB 32 1967                                 122.14    114.51


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

                                                   PUBLICATION DATE:  08/11/1988
Station ID: 9435385                                SUPERCEDED DATE:   04/21/2003
Name:       NEWPORT,  YAQUINA BAY                             
            OREGON
NOAA Chart: 18581                                  Latitude:         44° 37.6' N
USGS Quad:  YAQUINA                                Longitude:       124°  3.3' 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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