Superseded Bench Mark Sheet for 9440571, ALTOONA, COLUMBIA RIVER WA

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:  09/10/1986
Station ID: 9440571                                SUPERCEDED DATE:   04/21/2003
Name:       ALTOONA, COLUMBIA RIVER                           
            WASHINGTON
NOAA Chart: 18523                                  Latitude:         46° 15.9' N
USGS Quad:  ROSBURG                                Longitude:       123° 39.2' W


To reach the tidal bench marks from the intersection of State Highway 4 and
State Highway 403 at Rosburg, proceed south on State Highway 403 for
approximately 7 miles (11 km) to the town of Altoona.  The bench marks are
located along State Highway 403.  The tide gage and staff were located at the
old cannery building.


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


                 PRIMARY BENCH MARK STAMPING:  4 1940

MONUMENTATION:           Survey Disk                               VM#:     8916
AGENCY:                                                            PID#:  SC0534
SETTING CLASSIFICATION:  Bedrock


The bench mark is set in bedrock along State Highway 403, 110 feet (34 m) east
of the driveway leading into cannery, 82 feet (25 m) SE of of a metal garage,
and 32.85 feet (10.01 m) south of the centerline of the highway.



                         BENCH MARK STAMPING:  0571 A 1981

MONUMENTATION:           Survey Disk                               VM#:     8917
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Door Sill


The bench mark is set flush in concrete door sill on the south side of a large
metal garage, 101 feet (31 m) NNW of Bench Mark 4 1940, 40.5 feet (12.3 m) north
of the centerline of State Highway 403, 30.5 feet (9.3 m) east of the SW corner
of the garage, and 0.5 foot (0.2 m) south of the garage wall.

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

                                                   PUBLICATION DATE:  09/10/1986
Station ID: 9440571                                SUPERCEDED DATE:   04/21/2003
Name:       ALTOONA, COLUMBIA RIVER                           
            WASHINGTON
NOAA Chart: 18523                                  Latitude:         46° 15.9' N
USGS Quad:  ROSBURG                                Longitude:       123° 39.2' W


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


                         BENCH MARK STAMPING:  0571 B 1981

MONUMENTATION:           Survey Disk                               VM#:     8918
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Bedrock


The bench mark is set in bedrock along State Highway 403 near Dan Stephans
residence, 51.6 feet (15.7 m) east of utility/light pole, 48 feet (15 m) west of
utility pole, 18.2 feet (5.5 m) north of the centerline of the highway, and 0.2
foot (0.1 m) above the highway.



                         BENCH MARK STAMPING:  0571 C 1981

MONUMENTATION:           Survey Disk                               VM#:     8919
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Bedrock


The bench mark is set in bedrock about 0.2 mile (0.3 km) west of the old cannery
building, about 300 feet (91 m) north of a rock island, which lies west of the
cannery building, and 39 feet (12 m) south of the centerline of State Highway
403.



                         BENCH MARK STAMPING:  0571 D 1981

MONUMENTATION:           Survey Disk                               VM#:     8920
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Bedrock


The bench mark is set in bedrock along State Highway 403, about 0.5 mile (0.8
km) west of the old cannery building, 284 feet (87 m) NE of two large free
standing boulders at the bend in the highway, 50 feet (15 m) west of an utility
pole, 32 feet (10 m) north of the centerline of the highway.

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

                                                   PUBLICATION DATE:  09/10/1986
Station ID: 9440571                                SUPERCEDED DATE:   04/21/2003
Name:       ALTOONA, COLUMBIA RIVER                           
            WASHINGTON
NOAA Chart: 18523                                  Latitude:         46° 15.9' N
USGS Quad:  ROSBURG                                Longitude:       123° 39.2' W


                            T I D A L   D A T U M S 


Tidal datums at ALTOONA, COLUMBIA RIVER based on:

     LENGTH OF SERIES:      5 MONTHS
     TIME PERIOD:           JULY-NOVEMBER 1981
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  9439040 ASTORIA


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

     HIGHEST OBSERVED WATER LEVEL (11/14/1981)         =  11.69
     MEAN HIGHER HIGH WATER                     MHHW   =   7.95
     MEAN HIGH WATER                            MHW    =   7.29
     MEAN TIDE LEVEL                            MTL    =   4.13
     MEAN LOW WATER                             MLW    =   0.96
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (08/27/1981)         =  -1.45

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     4 1940                                     12.14      4.85
     0571 A 1981                                14.57      7.28
     0571 B 1981                                20.70     13.41
     0571 C 1981                                17.98     10.69
     0571 D 1981                                18.64     11.35


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

                                                   PUBLICATION DATE:  09/10/1986
Station ID: 9440571                                SUPERCEDED DATE:   04/21/2003
Name:       ALTOONA, COLUMBIA RIVER                           
            WASHINGTON
NOAA Chart: 18523                                  Latitude:         46° 15.9' N
USGS Quad:  ROSBURG                                Longitude:       123° 39.2' 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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