Superseded Bench Mark Sheet for 9439040, Astoria OR

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  8

                                                   PUBLICATION DATE:  01/18/1984
Station ID: 9439040                                SUPERCEDED DATE:   04/21/2003
Name:       ASTORIA, TONGUE POINT, COLUMBIA RIVER             
            OREGON
NOAA Chart: 18521                                  Latitude:         46° 12.5' N
USGS Quad:  ASTORIA                                Longitude:       123° 46.0' W


To reach the tidal bench marks from Highway 30, turn north onto Tongue Point
Road and proceed 0.9 miles (1.4 km) to the U.S. Coast Guard Base.  The Tide
House is located near the SW corner of the U.S. Coast Guard Pier with the tide
station located 90 feet (27 m) NE of the Tide House.


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


                 PRIMARY BENCH MARK STAMPING:  TIDAL 11 1959

MONUMENTATION:           Survey Disk                               VM#:     1071
AGENCY:                                                            PID#:  SC1053
SETTING CLASSIFICATION:  Concrete Pavement


The bench mark is set in the concrete pavement, 108 feet (33 m) east of Bench
Mark Tidal NO 12 1962, 77.5 feet (23.6 m) SE of the SE corner of USCG building
NO 7, 46 feet (14 m) south of Bench Mark Tidal 13 1964, 2.2 feet (0.7 m) SE of a
fire hydrant, and 0.3 foot (0.1 m) west of a 3 feet (l m) high concrete
retaining wall.



                         BENCH MARK STAMPING:  NO 1 1925

MONUMENTATION:           Survey Disk                               VM#:     1066
AGENCY:                                                            PID#:  SC0482
SETTING CLASSIFICATION:  Foundation


The bench mark is set in the north wall of USCG building No. 5, just east of the
USCG headquarters and machine shops building, and 1 foot (0.3 m) west of the NE
corner of building No.5.  The bench mark is set vertically  2 feet (1 m) above
grade.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  8

                                                   PUBLICATION DATE:  01/18/1984
Station ID: 9439040                                SUPERCEDED DATE:   04/21/2003
Name:       ASTORIA, TONGUE POINT, COLUMBIA RIVER             
            OREGON
NOAA Chart: 18521                                  Latitude:         46° 12.5' N
USGS Quad:  ASTORIA                                Longitude:       123° 46.0' W


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


                         BENCH MARK STAMPING:  7 1939

MONUMENTATION:           Survey Disk                               VM#:     1068
AGENCY:                                                            PID#:  SC0478
SETTING CLASSIFICATION:  Concrete Retaining Wall


The bench mark is set in the top of the SW corner of the concrete retaining wall
around the hill located north of USCG building No. 3, 29 feet (9 m) NW of the NW
corner of USCG building No. 3, and 15 feet (5 m) east of the west edge of the
roadway.  The bench mark is 3 feet (l m) above road level.



                         BENCH MARK STAMPING:  8 1940

MONUMENTATION:           Survey Disk                               VM#:     1069
AGENCY:                                                            PID#:  SC0479
SETTING CLASSIFICATION:  Concrete Slab


The bench mark is set in the SW corner of the concrete slab for the south
entrance of USCG building No. 7, 4.5 feet (1.4 m) south of the foundation wall,
and 0.5 feet (0.2 m) east of the west edge of the slab.  The bench mark is set
0.2 feet (0.1 m) above the pavement.



                         BENCH MARK STAMPING:  NO 10 1958

MONUMENTATION:           Survey Disk                               VM#:     1070
AGENCY:                                                            PID#:  SC0480
SETTING CLASSIFICATION:  Concrete Slab


The bench mark is set in the concrete threshold of USCG building No. 6, the
northernmost USCG building, 2 feet (1 m) from the west side of the entrance, and
1 foot (0.3 m) inside the sliding door entrance.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  8

                                                   PUBLICATION DATE:  01/18/1984
Station ID: 9439040                                SUPERCEDED DATE:   04/21/2003
Name:       ASTORIA, TONGUE POINT, COLUMBIA RIVER             
            OREGON
NOAA Chart: 18521                                  Latitude:         46° 12.5' N
USGS Quad:  ASTORIA                                Longitude:       123° 46.0' W


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


                         BENCH MARK STAMPING:  TIDAL NO 12 1962

MONUMENTATION:           Survey Disk                               VM#:     1072
AGENCY:                                                            PID#:  SC1055
SETTING CLASSIFICATION:  Concrete Wall


The bench mark is set in the top of the concrete guard wall on the south side of
the main USCG Dock, 97.5 feet (29.7 m) SSW of Bench Mark 8 1940, 15.5 feet (47.7
m) west of the east end of the wall, and 1.5 feet (0.5 m) east of the flagpole. 
The bench mark is set 1 foot (0.3 m) above dock level.



                         BENCH MARK STAMPING:  TIDAL 13 1964

MONUMENTATION:           Survey Disk                               VM#:     1073
AGENCY:                                                            PID#:  SC1054
SETTING CLASSIFICATION:  Concrete Stop


The bench mark is set in the top of the first concrete step of the stairway
leading up to USCG building No. 3, 126 feet (38 m) NE of the flagpole, 38.5 feet
(ll.7 m) SE of the SE corner of building No. 7, and 0.5 foot (0.2 m) SW of the
NE end of the first step.



                         BENCH MARK STAMPING:  NO 14 1971

MONUMENTATION:           Survey Disk                               VM#:     1074
AGENCY:                                                            PID#:  SC1052
SETTING CLASSIFICATION:  Concret Slab


The bench mark is set in the top of a 7 foot (2 m) square concrete slab for a
fire hydrant, protected by four 2 foot (1 m) high steel posts at each corner, 42
feet (13 m) east of the centerline of the USCG Base entrance road, 34.5 feet
(10.5 m) south of a chainlink fence at the USCG Base south entrance, and 3.5
feet (1.1 m) north of the south edge of the slab.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  8

                                                   PUBLICATION DATE:  01/18/1984
Station ID: 9439040                                SUPERCEDED DATE:   04/21/2003
Name:       ASTORIA, TONGUE POINT, COLUMBIA RIVER             
            OREGON
NOAA Chart: 18521                                  Latitude:         46° 12.5' N
USGS Quad:  ASTORIA                                Longitude:       123° 46.0' W


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


                         BENCH MARK STAMPING:  NO 16 1971

MONUMENTATION:           Survey Disk                               VM#:     1075
AGENCY:                                                            PID#:  SC1047
SETTING CLASSIFICATION:  Concrete Sidewalk


The bench mark is set in the sidewalk leading to the steps SW of the
intersection of River View Road and Tongue Point Road, 0.2 mile (0.3 km)
downhill from the guardhouse at the Job Corps entrance, 54.5 feet (16.6 m) west
of the centerline of Tongue Point Road, 29.5 feet (9.0 m) north of a fire main
plug, 28.5 feet (8.7) m SW of the centerline of River View Road, 7.5 feet (2.3
m) south of the north edge of the sidewalks joining the first flight of stairs,
and 0.5 foot (0.2 m) east of the first cement step.



                         BENCH MARK STAMPING:  NO 17 1971

MONUMENTATION:           Survey Disk                               VM#:     1076
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Curb


The bench mark is set in top of a concrete curb at the NW end of the large
asphalt parking lot 0.15 mile (0.24 km) downhill from the guard house at the Job
Corps entrance, 122 feet (37 m) west of the centerline of Tongue Point Road, 59
feet (18 m) north of the north wall of an abandoned service station, 42 feet
(12.8 m) south of the south wall of a large cement theater building, and east of
the west end of the curb.  The bench mark is set 0.5 foot (0.2 m) above grade.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  8

                                                   PUBLICATION DATE:  01/18/1984
Station ID: 9439040                                SUPERCEDED DATE:   04/21/2003
Name:       ASTORIA, TONGUE POINT, COLUMBIA RIVER             
            OREGON
NOAA Chart: 18521                                  Latitude:         46° 12.5' N
USGS Quad:  ASTORIA                                Longitude:       123° 46.0' W


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


                         BENCH MARK STAMPING:  9040 A 1981

MONUMENTATION:           Survey Disk                               VM#:     1077
AGENCY:                                                            PID#:  SC1048
SETTING CLASSIFICATION:  Galvanized Steel Rod


The bench mark is set along the east side of Tongue Point Road, 97 feet (30 m)
north of the centerline of Vista Way, 34 feet (10 m) east of the centerline of
Tongue Point Road, 18 feet (5 m) SE of the SE corner of a steam valve cover
labeled Steam NO. 28 1.8 feet (0.5 m) SW of the SE corner of the curb
surrounding an asphalt area south of the railroad bridge, and 0.5 feet (0.2 m)
south of a NOS wooden witness post.  The bench mark was driven to a depth of 24
feet (7 m), and set 0.3 foot (0.1 m) below grade in a 4-inch PVC pipe with cap.



                         BENCH MARK STAMPING:  9040 B 1981

MONUMENTATION:           Survey Disk                               VM#:     1078
AGENCY:                                                            PID#:  SC1050
SETTING CLASSIFICATION:  Galvanized Steel Rod


The bench mark is set along the west side of Tongue Point Road 213 feet (65 m)
south of Bench Mark NO 14 1971, 20.5 feet (6.2 m) west of the centerline of
Tongue Point Road, 3.1 feet (0.9 m) SW of the southeastern most corner of the
fence around the USCG Base , 2.1 feet (0.6 m) west of the concrete edge of
Tongue Point Road, and 0.7 foot (0.2 m) south of a NOS witness post.  The bench
mark was driven to a depth of 21 feet (6 m) and set 0.3 foot (0.1 m) below grade
in a 4-inch PVC pipe with cap.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  8

                                                   PUBLICATION DATE:  01/18/1984
Station ID: 9439040                                SUPERCEDED DATE:   04/21/2003
Name:       ASTORIA, TONGUE POINT, COLUMBIA RIVER             
            OREGON
NOAA Chart: 18521                                  Latitude:         46° 12.5' N
USGS Quad:  ASTORIA                                Longitude:       123° 46.0' W


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


                         BENCH MARK STAMPING:  9040 C 1981

MONUMENTATION:           Survey Disk                               VM#:     1079
AGENCY:                                                            PID#:  SC1051
SETTING CLASSIFICATION:  Galvanized Steel Rod


The bench mark is along the southern side of the fence surrounding the USCG
Base, 137 feet (42 m) north from the center of the intersection of Pier Street,
Tongue Point Road, and the USCG Base Entrance Road, 66 feet (20 m) east of the
centerline of the USCG Base Entrance Road, 47 feet (14 m) SE of the SW corner of
the USCG exchange building, 40.6 feet (12.4 m) NE of Bench Mark NO 14 1971, 3.2
feet (1.0 m) west of a NOS metal witness post, and 1.9 feet (0.6 m) south of the
fence.  The bench mark was driven in a depth of 16 feet (5 m) and set 0.3 foot
(0.1 m) below grade in a 4-inch with cap.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  8

                                                   PUBLICATION DATE:  01/18/1984
Station ID: 9439040                                SUPERCEDED DATE:   04/21/2003
Name:       ASTORIA, TONGUE POINT, COLUMBIA RIVER             
            OREGON
NOAA Chart: 18521                                  Latitude:         46° 12.5' N
USGS Quad:  ASTORIA                                Longitude:       123° 46.0' W


                            T I D A L   D A T U M S 


Tidal datums at ASTORIA, TONGUE POINT, COLUMBIA RIVER based on:

     LENGTH OF SERIES:      19 YEARS
     TIME PERIOD:           1960-1978
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:   


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

     HIGHEST OBSERVED WATER LEVEL (12/17/1933)         =  12.26
     MEAN HIGHER HIGH WATER                     MHHW   =   8.42
     MEAN HIGH WATER                            MHW    =   7.75
     MEAN TIDE LEVEL                            MTL    =   4.44
     MEAN LOW WATER                             MLW    =   1.12
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (01/19/1979)         =  -3.96

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     TIDAL 11 1959                              17.13      9.38
     NO 1 1925                                  19.79     12.04
     7 1939                                     34.30     26.55
     8 1940                                     17.41      9.66
     NO 10 1958                                 17.71      9.96
     TIDAL NO 12 1962                           17.71      9.96
     TIDAL 13 1964                              18.31     10.56
     NO 14 1971                                 22.21     14.46
     NO 16 1971                                 64.37     56.62
     NO 17 1971                                 73.93     66.18
     9040 A 1981                                55.19     47.44
     9040 B 1981                                30.39     22.64
     9040 C 1981                                23.53     15.78


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  8

                                                   PUBLICATION DATE:  01/18/1984
Station ID: 9439040                                SUPERCEDED DATE:   04/21/2003
Name:       ASTORIA, TONGUE POINT, COLUMBIA RIVER             
            OREGON
NOAA Chart: 18521                                  Latitude:         46° 12.5' N
USGS Quad:  ASTORIA                                Longitude:       123° 46.0' 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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