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Bench Mark Sheet for 9431647, Port Orford OR

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  9

                                                                                
Station ID: 9431647                         PUBLICATION DATE:  09/27/2011
Name:       PORT ORFORD, PACIFIC OCEAN                        
            OR
NOAA Chart: 18603                           Latitude:   42° 44.3' N (  42.73897)
USGS Quad:  PORT ORFORD                     Longitude: 124° 29.9' W (-124.49828)


To reach the tidal bench marks from U.S. Highway 101 (6th Street) in Port
Orford, proceed south on Harbor Drive towards the port of Port Orford. The road
turns to the west and ends on the Port Orford wharf. The bench marks are located
on and near the wharf and jetty. The tide gauge is located at the east corner of
the wharf.


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


                 PRIMARY BENCH MARK STAMPING:  NO 6 1937
                         DESIGNATION:          943 1647 TIDAL 6

MONUMENTATION:           Tidal Station disk                    VM#:         1035
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  OA0075
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   42° 44.4' N (  42.74058)          LONGITUDE: 124° 30.0' W (-124.49922)


The primary bench mark is a disk set flush in a large, gently curved outcropping
of bedrock, 37 m (120 ft) north of the Port Orford Municipal Pier, 8 m (25 ft)
north of the north face of a prominent pinnacle rock, and 3.20 m (10.5 ft) east
of the SE corner of Premium Pacific Seafoods.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  9

                                                                                
Station ID: 9431647                         PUBLICATION DATE:  09/27/2011
Name:       PORT ORFORD, PACIFIC OCEAN                        
            OR
NOAA Chart: 18603                           Latitude:   42° 44.3' N (  42.73897)
USGS Quad:  PORT ORFORD                     Longitude: 124° 29.9' W (-124.49828)


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


                         BENCH MARK STAMPING:  NO 9 1974
                         DESIGNATION:          943 1647 TIDAL 9

MONUMENTATION:           Tidal Station disk                    VM#:         1037
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  OA0785
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   42° 44.4' N (  42.73961)          LONGITUDE: 124° 30.0' W (-124.49989)


The bench mark is a disk set flush in the bedrock base of a high cliff west of
Port Orford Municipal Pier, 91 m (300 ft) west of bench mark Lead 1961, 36 m
(118 ft) west of the NW corner of a building labeled "The Dock", and 7.77 m
(25.5 ft) NW of bench mark 1647 G 1977, and 5.87 m (19.25 ft) SW of the corner
of the cement edge of the parking lot.



                         BENCH MARK STAMPING:  1647 G 1977
                         DESIGNATION:          943 1647 G TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         1038
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  OA0786
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   42° 44.4' N (  42.73953)          LONGITUDE: 124° 30.0' W (-124.49981)


The bench mark is a disk, set in an irregular shaped 3 m (10 ft) rock
outcropping, 33 m (109 ft) west of the bait and snack bar building labeled "The
Dock," 12.31 m (40.4 ft) south of the SW corner of a cinder block transformer
building, 7.68 m (25.2 ft) SE of bench mark NO 9 1974, and 0.6 m (2.0 ft) above
the paved parking area.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  9

                                                                                
Station ID: 9431647                         PUBLICATION DATE:  09/27/2011
Name:       PORT ORFORD, PACIFIC OCEAN                        
            OR
NOAA Chart: 18603                           Latitude:   42° 44.3' N (  42.73897)
USGS Quad:  PORT ORFORD                     Longitude: 124° 29.9' W (-124.49828)


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


                         BENCH MARK STAMPING:  TIDAL BM 1647 J 1978
                         DESIGNATION:          943 1647 J TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         1039
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  OA0788
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   42° 44.3' N (  42.73894)          LONGITUDE: 124° 30.0' W (-124.49933)


The bench mark is a disk set in bedrock, 73 m (240 ft) south of bench mark 1647
G 1977, 38.10 m (125.0 ft) west of a metal post with a green warning sign in a
concrete block, 38.10 m (125.0 ft) NW of bench mark TIDAL BM 1647 K 1978, 10.79
m (35.4 ft) NW of bench mark Lead 1961, 7.35 m (24.1 ft) east of exposed pipe in
a concrete patch, and 3.70 m (12.1 ft) south of the south edge of concrete
patch.



                         BENCH MARK STAMPING:  TIDAL BM 1647 K 1978
                         DESIGNATION:          943 1647 K TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         1040
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  OA0789
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   42° 44.3' N (  42.73867)          LONGITUDE: 124° 29.9' W (-124.49908)


The bench mark is a disk set in a rock outcrop, 69 m (225 ft) SE of the end of
an asphalt road, 31 m (103 ft) SE of bench mark Lead (1981), and 16.76 m (55.0
ft) west from a 1.37 m (4.5 ft) tall, 6-inch diameter steel pipe with a green
warning sign in a concrete block.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  9

                                                                                
Station ID: 9431647                         PUBLICATION DATE:  09/27/2011
Name:       PORT ORFORD, PACIFIC OCEAN                        
            OR
NOAA Chart: 18603                           Latitude:   42° 44.3' N (  42.73897)
USGS Quad:  PORT ORFORD                     Longitude: 124° 29.9' W (-124.49828)


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


                         BENCH MARK STAMPING:  1647 N 1983
                         DESIGNATION:          943 1647 N TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         1043
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  OA0787
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   42° 44.4' N (  42.73931)          LONGITUDE: 124° 30.0' W (-124.49978)


The bench mark is a disk set in a rock outcrop, 56.39 m (185.0 ft)  NW of bench
mark 1647 J 1978, 48.46 m (159.0 ft) SW of the south corner of wooden building
labeled "The Dock", 27.74 m (91.0 ft) south of bench mark 1647 G 1977, and 6.10
m (20.0 ft) east of the SW edge of bedrock outcrop.



                         BENCH MARK STAMPING:  LEAD 1961
                         DESIGNATION:          943 1647 TIDAL LEAD

MONUMENTATION:           Bench Mark disk                       VM#:         1044
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:  OA0790
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID#: OA0790
LATITUDE:   42° 44.3' N (  42.73903)          LONGITUDE: 124° 30.0' W (-124.49925)


The bench mark is a disk set in a rock outcrop, 85 m (279 ft) SE of bench mark
1647 G 1977, 31 m (103 ft) NW of bench mark TIDAL BM 1647 K 1978, 31 m (101 ft)
south of the southern-most of two 2 m (6 ft) high, 2-inch diameter steel pipes
set in the low concrete wall of the SW entrance to the wooden dock, 30 m (100
ft) NW of a 1.37 m (4.5 ft) high, 6-inch diameter steel pipe with a green
warning sign set in a concrete block, and 10.79 m (35.4 ft) SE of bench mark
TIDAL BM 1647 J 1978.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  9

                                                                                
Station ID: 9431647                         PUBLICATION DATE:  09/27/2011
Name:       PORT ORFORD, PACIFIC OCEAN                        
            OR
NOAA Chart: 18603                           Latitude:   42° 44.3' N (  42.73897)
USGS Quad:  PORT ORFORD                     Longitude: 124° 29.9' W (-124.49828)


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


                         BENCH MARK STAMPING:  1647 S 2002
                         DESIGNATION:          943 1647 S

MONUMENTATION:           Tidal Station disk                    VM#:        16701
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete pier deck                    OPUS PID:        
LATITUDE:   42° 44.3' N (  42.73869)          LONGITUDE: 124° 29.9' W (-124.49814)


The bench mark is a disk set flush in concrete deck at city pier, 6.95 m (22.8
ft) SE of the SE corner Hallmark Fisheries wood building, 2.90 m (9.51 ft) SSW
of NOS tide house, 0.53 m (1.74 ft) west of second lamp post from the end of the
pier, and 0.44 m (1.44 ft) north of outer bullrail. 



                         BENCH MARK STAMPING:  1647 T 2002
                         DESIGNATION:          943 1647 T

MONUMENTATION:           Tidal Station disk                    VM#:        16702
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete pier deck                    OPUS PID:        
LATITUDE:   42° 44.4' N (  42.73964)          LONGITUDE: 124° 29.9' W (-124.49853)


The bench mark is a disk set flush in concrete deck on the east of the pier,
3.70 m (12.1 ft) north of a large yellow crane, 0.58 m (1.9 ft) west of
north-south running section of a bullrail, and 0.55 m (1.8 ft) south of
east-west running section of the bullrail.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  9

                                                                                
Station ID: 9431647                         PUBLICATION DATE:  09/27/2011
Name:       PORT ORFORD, PACIFIC OCEAN                        
            OR
NOAA Chart: 18603                           Latitude:   42° 44.3' N (  42.73897)
USGS Quad:  PORT ORFORD                     Longitude: 124° 29.9' W (-124.49828)


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


                         BENCH MARK STAMPING:  1647 U 2011
                         DESIGNATION:          943 1647 U

MONUMENTATION:           Tidal Station disk                    VM#:        19985
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete bull rail                    OPUS PID:        
LATITUDE:   42° 44.4' N (  42.74014)          LONGITUDE: 124° 29.9' W (-124.49875)


The bench mark is a disk set flush at the north end of the concrete bull rail on
the north east side of the Port Orford pier, 42.9 m (140.7 ft) NW of the walkway
entrance ramp to the floating dock, 6.66 m (21.9 ft) SSE of a fire hydrant, 5.94
m (19.5 ft) NNE of the NE edge of the NE concrete boat parking pad, 0.205 m (0.7
ft) SE of the northern most end of the bull rail and 0.32 m (1.0 ft) above
ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  9

                                                                                
Station ID: 9431647                         PUBLICATION DATE:  09/27/2011
Name:       PORT ORFORD, PACIFIC OCEAN                        
            OR
NOAA Chart: 18603                           Latitude:   42° 44.3' N (  42.73897)
USGS Quad:  PORT ORFORD                     Longitude: 124° 29.9' W (-124.49828)


                            T I D A L   D A T U M S 


Tidal datums at PORT ORFORD, PACIFIC OCEAN based on:

     LENGTH OF SERIES:      17 YEARS
     TIME PERIOD:           January 1982 - December 1998
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9419750 CRESCENT CITY, PACIFIC OCEAN


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

     HIGHEST OBSERVED WATER LEVEL (02/17/1978)         =  3.503
     MEAN HIGHER HIGH WATER                     MHHW   =  2.221
     MEAN HIGH WATER                            MHW    =  2.004
     MEAN TIDE LEVEL                            MTL    =  1.210
     MEAN SEA LEVEL                             MSL    =  1.199
     MEAN LOW WATER                             MLW    =  0.415
     North American Vertical Datum              NAVD88 =  0.151
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/12/2009)         = -0.977

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 6 1937                                   5.231    3.227
     NO 9 1974                                   8.466    6.462
     1647 G 1977                                 7.801    5.797
     TIDAL BM 1647 J 1978                        5.645    3.641
     TIDAL BM 1647 K 1978                        6.484    4.480
     1647 N 1983                                 5.256    3.252
     LEAD 1961                                   6.025    4.021
     1647 S 2002                                 7.571    5.567
     1647 T 2002                                 7.642    5.638
     1647 U 2011                                 7.473    5.469


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  9

                                                                                
Station ID: 9431647                         PUBLICATION DATE:  09/27/2011
Name:       PORT ORFORD, PACIFIC OCEAN                        
            OR
NOAA Chart: 18603                           Latitude:   42° 44.3' N (  42.73897)
USGS Quad:  PORT ORFORD                     Longitude: 124° 29.9' W (-124.49828)


Foot Notes:

Bench marks 1647 U 2011 is based on one differential leveling connection and do
not meet the quality control standards of the NOS.  Therefore, caution should be
used when deriving elevations for this mark.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  9 of  9

                                                                                
Station ID: 9431647                         PUBLICATION DATE:  09/27/2011
Name:       PORT ORFORD, PACIFIC OCEAN                        
            OR
NOAA Chart: 18603                           Latitude:   42° 44.3' N (  42.73897)
USGS Quad:  PORT ORFORD                     Longitude: 124° 29.9' W (-124.49828)


                             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 NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.

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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Products available at 9431647 Port Orford, OR

Revised: 08/08/2018
NOAA / National Ocean Service
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