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Bench Mark Sheet for 9412110, Port San Luis CA

Superseded Epoch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Small blue map location marker Unpublished bench mark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  7

                                                                                
Station ID: 9412110                         PUBLICATION DATE:  04/21/2003
Name:       PORT SAN LUIS, PACIFIC OCEAN                      
            CA
NOAA Chart: 18704                           Latitude:   35° 10.6' N (  35.17670)
USGS Quad:  PORT SAN LUIS                   Longitude: 120° 45.6' W (-120.76000)


To reach the tidal bench marks, from north bound U.S. Highway 101 and Avila Road
(marked Avila Beach and Port San Luis Marina) proceed SW on Avila Road for about
7.2 km (4.5 mi) to Port San Luis Harbor District area and the pier just beyond
the Pacific Gas & Electric (PG&E) Nuclear Power Plant entrance.  The tidal bench
marks are located on the Harbor District grounds, at the entrance to the power
plant, and along Avila Road.  The tide gage is located in the ice house at the
end of the pier.


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


                 PRIMARY BENCH MARK STAMPING:  6 1936
                         DESIGNATION:          941 2110 TIDAL 6

MONUMENTATION:           Bench Mark disk                       VM#:          945
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  FV0898
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID#: FV0898
LATITUDE:   35° 10.3' N (  35.17097)          LONGITUDE: 120° 45.4' W (-120.75603)


The primary bench mark is a disk set in the top of a rock outcrop at the inshore
end of the pier, 53 m (175 ft) SW of a flagpole, 17 m (55 ft) NE of the east guy
pole of the most eastern of two crabbing docks, 7.92 m (26.0 ft) ESE of a brass
fire hydrant surrounded by four metal posts at the SW corner of the pier, 2.38 m
(7.8 ft) SW of the SW edge of the pier, and 1 m (2 ft) below the pier floor, and
0.34 m (1.1 ft) SW of SW end of a 0.3 m (1 ft) square timber supporting the
inshore end of the wharf.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 9412110                         PUBLICATION DATE:  04/21/2003
Name:       PORT SAN LUIS, PACIFIC OCEAN                      
            CA
NOAA Chart: 18704                           Latitude:   35° 10.6' N (  35.17670)
USGS Quad:  PORT SAN LUIS                   Longitude: 120° 45.6' W (-120.76000)


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


                         BENCH MARK STAMPING:  NO 16 1973
                         DESIGNATION:          941 2110 TIDAL 16

MONUMENTATION:           Tidal Station disk                    VM#:          948
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  FV1078
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   35° 10.3' N (  35.17247)          LONGITUDE: 120° 45.3' W (-120.75575)


The bench mark is a disk set flush in the top of a concrete sea wall at the NE
end of the Port San Luis wharf area, 7.96 m (26.1 ft) north of the NW corner of
a gasoline service station building, 2.83 m (9.3 ft) SE of the NW end of the
sea-wall, and 0.15 m (0.5 ft) SW of the NE face of the sea wall.



                         BENCH MARK STAMPING:  TIDAL BM 18 1975
                         DESIGNATION:          941 2110 TIDAL 18

MONUMENTATION:           Tidal Station disk                    VM#:          949
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  FV1077
SETTING CLASSIFICATION:  Concrete pier                         OPUS PID:        
LATITUDE:   35° 10.3' N (  35.17169)          LONGITUDE: 120° 45.3' W (-120.75572)


The bench mark is a disk set flush in the SW corner of a concrete base for a
marine hoist, 72 m (237 ft) north of the inshore end of the Port San Luis wharf,
12.13 m (39.8 ft) NE from southern gate post, and 0.15 m (0.5 ft) NE of the SW
edge of pier.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 9412110                         PUBLICATION DATE:  04/21/2003
Name:       PORT SAN LUIS, PACIFIC OCEAN                      
            CA
NOAA Chart: 18704                           Latitude:   35° 10.6' N (  35.17670)
USGS Quad:  PORT SAN LUIS                   Longitude: 120° 45.6' W (-120.76000)


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


                         BENCH MARK STAMPING:  TIDAL BM 20 1975
                         DESIGNATION:          941 2110 TIDAL 20

MONUMENTATION:           Tidal Station disk                    VM#:          950
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  FV1079
SETTING CLASSIFICATION:  Concrete culvert                      OPUS PID:        
LATITUDE:   35° 10.5' N (  35.17500)          LONGITUDE: 120° 45.3' W (-120.75558)


The bench mark is a disk set flush in a concrete culvert south of the entrance
to the Pacific Gas & Electric (PG&E) Nuclear Power Plant, 40 m (132 ft) WSW of a
movable guard house, 20 m (65 ft) west of the centerline of Port San Luis Road,
8 m (27 ft) south of the centerline of the PG&E entrance road, and 1 m (2 ft)
north of a lightpole.



                         BENCH MARK STAMPING:  2110 A 1982
                         DESIGNATION:          941 2110 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:          951
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  FV1991
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   35° 10.4' N (  35.17275)          LONGITUDE: 120° 45.4' W (-120.75617)


The bench mark is a disk, located at the north end of the traffic island at the
Y junction entrance to Port San Luis Harbor District Area, 8 m (27 ft) west of
the centerline of the road leading to the fuel dock, 6 m (19 ft) east of the
centerline of the main entrance road, and 2.99 m (9.8 ft) NW of the center of a
large 1.01 m (3.3 ft) diameter manhole cover.  The bench mark is set 15 cm (0.5
ft) above ground, crimped to a stainless steel rod driven 4.3 m (14 ft) to
refusal, and surrounded by a 4-inch PVC pipe.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 9412110                         PUBLICATION DATE:  04/21/2003
Name:       PORT SAN LUIS, PACIFIC OCEAN                      
            CA
NOAA Chart: 18704                           Latitude:   35° 10.6' N (  35.17670)
USGS Quad:  PORT SAN LUIS                   Longitude: 120° 45.6' W (-120.76000)


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


                         BENCH MARK STAMPING:  2110 D 1982
                         DESIGNATION:          941 2110 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:          953
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  FV1994
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   35° 10.2' N (  35.17069)          LONGITUDE: 120° 45.4' W (-120.75628)


The bench mark is a disk set flush in the NE end of the southwesterly of two
identical fishing ramps facing the waterfront, 38.25 m (125.5 ft) SW of bench
mark 6 1936, 12.34 m (40.5 ft) NE of the SE corner of the fenced lot of Port San
Luis Harbor District maintenance Division, and 4.69 m (15.4 ft) SE of eastern
most pole of three metal poles blocking NE edge of boat ramp.



                         BENCH MARK STAMPING:  NO 15 1971 RESET 1983
                         DESIGNATION:          941 2110 TIDAL 15 RESET

MONUMENTATION:           Tidal Station disk                    VM#:          954
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  FV1993
SETTING CLASSIFICATION:  Concrete walkway                      OPUS PID:        
LATITUDE:   35° 10.3' N (  35.17133)          LONGITUDE: 120° 45.4' W (-120.75617)


The bench mark is a disk set flush in the concrete walkway surrounding the Port
San Luis Harbor Office building, 11.03 m (36.2 ft) SW of the NE corner of the
building, 1.10 m (3.6 ft) east of the street curbing, and 0.27 m (0.9 ft) south
of the NE corner of a 1 m (3 ft) wall across the entrance way to the Harbor
Office.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 9412110                         PUBLICATION DATE:  04/21/2003
Name:       PORT SAN LUIS, PACIFIC OCEAN                      
            CA
NOAA Chart: 18704                           Latitude:   35° 10.6' N (  35.17670)
USGS Quad:  PORT SAN LUIS                   Longitude: 120° 45.6' W (-120.76000)


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


                         BENCH MARK STAMPING:  MAR 3 LS 3354
                         DESIGNATION:          MAR 3

MONUMENTATION:           Survey disk                           VM#:          955
AGENCY:                  Private firm                          IDB PID#:  FV1992
SETTING CLASSIFICATION:  Concrete walkway                      OPUS PID:        
LATITUDE:   35° 10.3' N (  35.17142)          LONGITUDE: 120° 45.4' W (-120.75636)


The bench mark is a disk set flush in the concrete walkway surrounding the Port
San Luis Harbor Office building, 7.32 m (24.0 ft) ESE of the flag pole, 2.41 m
(7.9 ft) east of the NE corner of the building, and 0.49 m (1.6 ft) west of the
east corner of the red curbing of the walkway.



                         BENCH MARK STAMPING:  2110 E 2000
                         DESIGNATION:          941 2110 E

MONUMENTATION:           Tidal Station disk                    VM#:        16190
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete vault                        OPUS PID:        
LATITUDE:   35° 10.5' N (  35.17553)          LONGITUDE: 120° 45.2' W (-120.75411)


The bench mark is a disk set flush in the SW corner of a concrete utility vault
on north side of a road to Port San Luis Pier, east of the entrance to the
nuclear power plant, 6.71 m (22.0 ft) west of a No Parking sign, 4.27 m (14.0
ft) north of a centerline of the road, 0.24 m (0.8 ft) north of south edge of
the vault, and 0.24 m (0.8 ft) east of west edge of the vault.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 9412110                         PUBLICATION DATE:  04/21/2003
Name:       PORT SAN LUIS, PACIFIC OCEAN                      
            CA
NOAA Chart: 18704                           Latitude:   35° 10.6' N (  35.17670)
USGS Quad:  PORT SAN LUIS                   Longitude: 120° 45.6' W (-120.76000)


                            T I D A L   D A T U M S 


Tidal datums at PORT SAN LUIS, PACIFIC OCEAN based on:

     LENGTH OF SERIES:      19 Years
     TIME PERIOD:           January 1983 - December 2001
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:   


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

     HIGHEST OBSERVED WATER LEVEL (01/18/1973)         =  2.331
     MEAN HIGHER HIGH WATER                     MHHW   =  1.623
     MEAN HIGH WATER                            MHW    =  1.408
     MEAN TIDE LEVEL                            MTL    =  0.863
     MEAN SEA LEVEL                             MSL    =  0.853
     MEAN LOW WATER                             MLW    =  0.317
     North American Vertical Datum              NAVD88 =  0.024
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/07/1951)         = -0.732

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6 1936                                      4.395    2.987
     NO 16 1973                                  2.839    1.431
     TIDAL BM 18 1975                            3.555    2.147
     TIDAL BM 20 1975                           10.146    8.738
     2110 A 1982                                 4.628    3.220
     2110 D 1982                                 3.416    2.008
     NO 15 1971 RESET 1983                       4.825    3.417
     MAR 3 LS 3354                               4.814    3.406
     2110 E 2000                                 9.786    8.378


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

                                                                                
Station ID: 9412110                         PUBLICATION DATE:  04/21/2003
Name:       PORT SAN LUIS, PACIFIC OCEAN                      
            CA
NOAA Chart: 18704                           Latitude:   35° 10.6' N (  35.17670)
USGS Quad:  PORT SAN LUIS                   Longitude: 120° 45.6' W (-120.76000)


                             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 9412110 Port San Luis, CA

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services