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

                                                   PUBLICATION DATE:  04/15/1982
Station ID: 9414806                                SUPERCEDED DATE:   04/21/2003
Name:       SAUSALITO, SAN FRANCISCO BAY                      
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 50.8' N
USGS Quad:  SANFRANCISCO NORTH                     Longitude:       122° 28.6' W


To reach the tidal bench marks from US Highway 10l, exit at Alexander Avenue
(north end of Golden Gate Bridge), north one mile to 18 Alexander Avenue (north
side of street) and park, and then down six flights of steps to dock.  The tide
gage and staff were located on the southwest corner of the T in the dock.


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


                 PRIMARY BENCH MARK STAMPING:  4806 C 1977

MONUMENTATION:           Survey Disk                               VM#:     8415
AGENCY:                                                            PID#:  HT3537
SETTING CLASSIFICATION:  Rock Outcrop


The bench mark is set horizontally in rock outcropping (partially supports
foundation of house) underneath shore end of pier at 18 Alexander Avenue, and
3.4 feet above level of beach.



                         BENCH MARK STAMPING:  29 1936

MONUMENTATION:           Survey Disk                               VM#:     8413
AGENCY:                                                            PID#:  HT1073
SETTING CLASSIFICATION:  Concrete Pylon


The bench mark is set vertically in north face of concrete pylon at 485
Bridgeway Street, at northeast corner of concrete retaining wall surrounding old
Hearst Estate, and one foot above street level.

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

                                                   PUBLICATION DATE:  04/15/1982
Station ID: 9414806                                SUPERCEDED DATE:   04/21/2003
Name:       SAUSALITO, SAN FRANCISCO BAY                      
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 50.8' N
USGS Quad:  SANFRANCISCO NORTH                     Longitude:       122° 28.6' W


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


                         BENCH MARK STAMPING:  30 1936

MONUMENTATION:           Survey Disk                               VM#:     8414
AGENCY:                                                            PID#:  HT1074
SETTING CLASSIFICATION:  Stone Base


The bench mark is located in public park at base of stone ornamental elephant on
east side of Bridgeway Street, in northwest one of pair of elephants, and 81
feet northwest of El Potal Street.



                         BENCH MARK STAMPING:  4806 D 1977

MONUMENTATION:           Survey Disk                               VM#:     8416
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Rock Outcrop


The bench mark is set horizontally in a rock outcropping beneath
north-easternmost building of Cote dAzur Apartments at 100 South Street, between
4th and 5th pilings from northeast corner of building and lst and 2nd row of
pilings from shore.  Bench mark should be leveled to at low tide.



                         BENCH MARK STAMPING:  UNSTAMPED (COPPER PIN)

MONUMENTATION:           Survey Disk                               VM#:     8417
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Outcrop


The bench mark is set in an outcropping of rocks, 98 feet southof Sausalito
Sewage Treatment Plant, and projecting 0.2 foot above the outcropping.

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

                                                   PUBLICATION DATE:  04/15/1982
Station ID: 9414806                                SUPERCEDED DATE:   04/21/2003
Name:       SAUSALITO, SAN FRANCISCO BAY                      
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 50.8' N
USGS Quad:  SANFRANCISCO NORTH                     Longitude:       122° 28.6' W


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


                         BENCH MARK STAMPING:  UNSTAMPED (COPPER BOLT)

MONUMENTATION:           Survey Disk                               VM#:     8418
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Outcrop


The bench mark is set in high point of outermost of two rocks (separated from
shore at times by 6.5 foot wide channel), north of Sausalito City limits, and
246 feet south southeast of shore and pier at 18 Alexander Avenue.

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

                                                   PUBLICATION DATE:  04/15/1982
Station ID: 9414806                                SUPERCEDED DATE:   04/21/2003
Name:       SAUSALITO, SAN FRANCISCO BAY                      
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 50.8' N
USGS Quad:  SANFRANCISCO NORTH                     Longitude:       122° 28.6' W


                            T I D A L   D A T U M S 


Tidal datums at SAUSALITO, SAN FRANCISCO BAY based on:

     LENGTH OF SERIES:      24 MONTHS
     TIME PERIOD:           MAR 1977 - FEB 1979
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  9414290 SAN FRANCISCO, CA


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

     MEAN HIGHER HIGH WATER                     MHHW   =   5.67
     MEAN HIGH WATER                            MHW    =   5.08
     MEAN TIDE LEVEL                            MTL    =   3.10
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   2.77
     MEAN LOW WATER                             MLW    =   1.13
     MEAN LOWER LOW WATER                       MLLW   =   0.00

   * NGVD reference based on adjustment of 1956 and NOS levelsof 1977-1979. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     4806 C 1977                                 7.41      2.33
     29 1936                                    11.32      6.24
     30 1936                                    16.07     10.99
     4806 D 1977                                 2.78     -2.30
     UNSTAMPED (COPPER PIN)                      7.20      2.12
     UNSTAMPED (COPPER BOLT)                     3.89     -1.19


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

                                                   PUBLICATION DATE:  04/15/1982
Station ID: 9414806                                SUPERCEDED DATE:   04/21/2003
Name:       SAUSALITO, SAN FRANCISCO BAY                      
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 50.8' N
USGS Quad:  SANFRANCISCO NORTH                     Longitude:       122° 28.6' 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.