Superseded Bench Mark Sheet for 9440875, SOUTH BEND WA

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  02/04/1993
Station ID: 9440875                                SUPERCEDED DATE:   04/21/2003
Name:       SOUTH BEND, WILLAPA RIVER                         
            WASHINGTON
NOAA Chart: 18504                                  Latitude:         46° 39.8' N
USGS Quad:  SOUTH BEND                             Longitude:       123° 47.9' W


To reach the tidal bench marks from the intersection of Kendrick Street and
Robert Bush Drive (U.S. Highway 101) in South Bend, proceed SW on Robert Bush
Drive for 0.25 mile (0.40 km) to Peterson and Sons Seafoods, Inc. processing
plant on the north side of Robert Bush Drive. The bench marks are along Robert
Bush Drive and Kendrick Street. The tide gage and staff were on the wharf on the
north side of the processing plant.


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


                 PRIMARY BENCH MARK STAMPING:  0875A 1982

MONUMENTATION:           Survey Disk                               VM#:     8966
AGENCY:                                                            PID#:  SC0954
SETTING CLASSIFICATION:  Concrete Foundation


The primary bench mark is set in the NE corner of a raised ledge along the north
face of the concrete foundation for Buds Lumber Company single story wood
building, 44 feet (13 m) south of the centerline of Robert Bush Drive (U.S.
Highway 101), 2.4 feet (0.7 m) south of the north edge of the ledge, 0.6 foot
(0.2 m) north of the north face of Buds Lumber Company building, and 0.6 foot
(0.2 m) west of the east edge of the ledge.



                         BENCH MARK STAMPING:  0875B 1982

MONUMENTATION:           Survey Disk                               VM#:     8967
AGENCY:                                                            PID#:  SC0956
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set in the NE corner of a concrete footing for the steps to
Gavel Lodge, 73 feet (22 m) south of the centerline of Robert Bush Drive (U.S.
Highway 101), 15 feet (5 m) north of the north face of the building, 5.6 feet
(1.7 m) north of the south face of a 3.5 X 6 X 4-foot (1.1 X 2 X 1 m) brick
planter, and 3.7 feet (1.1 m) east of the east edge of the steps.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                   PUBLICATION DATE:  02/04/1993
Station ID: 9440875                                SUPERCEDED DATE:   04/21/2003
Name:       SOUTH BEND, WILLAPA RIVER                         
            WASHINGTON
NOAA Chart: 18504                                  Latitude:         46° 39.8' N
USGS Quad:  SOUTH BEND                             Longitude:       123° 47.9' W


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


                         BENCH MARK STAMPING:  0875C 1982

MONUMENTATION:           Survey Disk                               VM#:     8968
AGENCY:                                                            PID#:  SC0957
SETTING CLASSIFICATION:  Concrete Door Sill


The bench mark is set in an abandoned concrete door sill NW of Gavel Lodge and
near an old abandoned brick wall, 77.5 feet (23.6 m) NW of the NW corner of the
concrete footing for the brick planter west of the entrance stairs to Gavel
Lodge, 71.5 feet (21.8 m) north of the NW corner of Gavel Lodge, 41.5 feet (12.6
m) south of the centerline of Robert Bush Drive (U.S. Highway 101), 4 feet (1 m)
west of a 1.5-foot (0.5 m) square brick column, and 1 foot (0.3 m) east of the
old 14 foot (4 m) brick wall.



                         BENCH MARK STAMPING:  0875D 1982

MONUMENTATION:           Survey Disk                               VM#:     8969
AGENCY:                                                            PID#:  SC0955
SETTING CLASSIFICATION:  Concrete Retaining Wall


The bench mark is set in the NE corner of the retaining wall for a concrete
planter at the Country Bowl single story wood frame building, 76.5 feet (23.3 m)
south of the centerline of Robert Bush Drive (U.S. Highway 101), 2.2 feet (0.7
m) west of the west facing corner of the building entrance, and 1.6 feet (0.5 m)
north of the north face of the building.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                   PUBLICATION DATE:  02/04/1993
Station ID: 9440875                                SUPERCEDED DATE:   04/21/2003
Name:       SOUTH BEND, WILLAPA RIVER                         
            WASHINGTON
NOAA Chart: 18504                                  Latitude:         46° 39.8' N
USGS Quad:  SOUTH BEND                             Longitude:       123° 47.9' W


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


                         BENCH MARK STAMPING:  0875E 1982

MONUMENTATION:           Survey Disk                               VM#:     8970
AGENCY:                                                            PID#:  SC0953
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set vertically in the north face of St. Lawrences Church, 88
feet (27 m) north of the centerline of First Street, 64 feet (20 m) west of the
centerline of Kendrick Street, 9 feet (3 m) west of the NE corner of the church,
and 1 foot (0.3 m) above the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                   PUBLICATION DATE:  02/04/1993
Station ID: 9440875                                SUPERCEDED DATE:   04/21/2003
Name:       SOUTH BEND, WILLAPA RIVER                         
            WASHINGTON
NOAA Chart: 18504                                  Latitude:         46° 39.8' N
USGS Quad:  SOUTH BEND                             Longitude:       123° 47.9' W


                            T I D A L   D A T U M S 


Tidal datums at SOUTH BEND, WILLAPA RIVER based on:

     LENGTH OF SERIES:      128 HIGHS, 127 LOWS
     TIME PERIOD:           May 15 - July 19, 1982
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  9440910 TOKE POINT


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

     HIGHEST OBSERVED WATER LEVEL (06/21/1982)         =  11.17
     MEAN HIGHER HIGH WATER                     MHHW   =   9.72
     MEAN HIGH WATER                            MHW    =   9.02
     MEAN TIDE LEVEL                            MTL    =   5.21
     MEAN LOW WATER                             MLW    =   1.40
     LOWEST  OBSERVED WATER LEVEL (05/24/1982)         =  -3.93

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     0875A 1982                                 15.62      6.60
     0875B 1982                                 24.79     15.77
     0875C 1982                                 25.69     16.67
     0875D 1982                                 15.85      6.83
     0875E 1982                                 14.60      5.58


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

                                                   PUBLICATION DATE:  02/04/1993
Station ID: 9440875                                SUPERCEDED DATE:   04/21/2003
Name:       SOUTH BEND, WILLAPA RIVER                         
            WASHINGTON
NOAA Chart: 18504                                  Latitude:         46° 39.8' N
USGS Quad:  SOUTH BEND                             Longitude:       123° 47.9' 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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