Superseded Bench Mark Sheet for 9410583, BALBOA CA

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:  07/30/1982
Station ID: 9410583                                SUPERCEDED DATE:   04/21/2003
Name:       BALBOA PIER, NEWPORT BEACH, PACIFIC OCEAN         
            CALIFORNIA
NOAA Chart: 18754                                  Latitude:         33° 35.9' N
USGS Quad:  NEWPORT BEACH                          Longitude:       117° 54.0' W


To reach the tidal bench marks proceed east along outer coast along Balboa
Boulevard through Newport Beach to Balboa and Balboa Pier projecting out into
the Pacific Ocean.  The bench marks are along the pier and nearby parking lot
and hotel condominiums.  The tide gage and pier were on the outer end of the
pier near the concession stand and bait shop.


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


                 PRIMARY BENCH MARK STAMPING:  BM 1 1974

MONUMENTATION:           Survey Disk                               VM#:     7995
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Drill Hole In Concrete


The bench mark is in the concrete curbing of Balboa Pier, 246 feet (75 m)
southwest from Bench Mark BM 2 1974, 174 feet (53 m) from the fishing platform
on the end of the pier and on the southeasternmost of 4 small fishing platforms
at the base of light post number KL.



                         BENCH MARK STAMPING:  BM 2 1974

MONUMENTATION:           Survey Disk                               VM#:     7996
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Curb


The bench mark is on the curbing of the easternmost of 4 small fishing platforms
on Balboa Pier and 39 feet (12 m) from light post KN.

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

                                                   PUBLICATION DATE:  07/30/1982
Station ID: 9410583                                SUPERCEDED DATE:   04/21/2003
Name:       BALBOA PIER, NEWPORT BEACH, PACIFIC OCEAN         
            CALIFORNIA
NOAA Chart: 18754                                  Latitude:         33° 35.9' N
USGS Quad:  NEWPORT BEACH                          Longitude:       117° 54.0' W


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


                         BENCH MARK STAMPING:  BM 3 1974

MONUMENTATION:           Survey Disk                               VM#:     7997
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Curb


The bench mark is in the concrete curb around the flagpole at the foot of Balboa
Pier and on the southeast side of the flagpole.



                         BENCH MARK STAMPING:  BM 4 1974

MONUMENTATION:           Survey Disk                               VM#:     7998
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Drill Hole


The bench mark is on the street connecting Balboa Pier, directly below lamp post
K-17 and stop sign on the right side and 167 feet (51 m) from Bench Mark BM 3
1974.



                         BENCH MARK STAMPING:  BM 5 1974

MONUMENTATION:           Survey Disk                               VM#:     7999
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Curb


The bench mark is in concrete curbing along the walkway in from of Balboa Inn,
north northwest of Bench Mark BM 4 1974, 213 feet (65 m) north of Bench Mark BM
4 1974, and 10 feet (3 m) south southwest of third lamp post from Bench Mark 4
1974.

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

                                                   PUBLICATION DATE:  07/30/1982
Station ID: 9410583                                SUPERCEDED DATE:   04/21/2003
Name:       BALBOA PIER, NEWPORT BEACH, PACIFIC OCEAN         
            CALIFORNIA
NOAA Chart: 18754                                  Latitude:         33° 35.9' N
USGS Quad:  NEWPORT BEACH                          Longitude:       117° 54.0' W


                            T I D A L   D A T U M S 


Tidal datums at BALBOA PIER, NEWPORT BEACH, PACIFIC OCEAN based on:

     LENGTH OF SERIES:      95 HW & 95 LW
     TIME PERIOD:           OCTOBER 1974 AND MARCH 4-APRIL 6, 1975
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  9410660 LOS ANGELES


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

     HIGHEST OBSERVED WATER LEVEL (10/17/1974)         =   6.10
     MEAN HIGHER HIGH WATER                     MHHW   =   5.33
     MEAN HIGH WATER                            MHW    =   4.57
     MEAN TIDE LEVEL                            MTL    =   2.74
     MEAN LOW WATER                             MLW    =   0.92
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (03/29/1975)         =  -1.20



Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     BM 1 1974                                  24.56     19.99
     BM 2 1974                                  24.65     20.08
     BM 3 1974                                  15.11     10.54
     BM 4 1974                                  12.48      7.91
     BM 5 1974                                  13.23      8.66


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

                                                   PUBLICATION DATE:  07/30/1982
Station ID: 9410583                                SUPERCEDED DATE:   04/21/2003
Name:       BALBOA PIER, NEWPORT BEACH, PACIFIC OCEAN         
            CALIFORNIA
NOAA Chart: 18754                                  Latitude:         33° 35.9' N
USGS Quad:  NEWPORT BEACH                          Longitude:       117° 54.0' 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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