U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  7

                                                                                
Station ID: 9410170                                PUBLICATION DATE:  04/21/2003
Name:       SAN DIEGO, SAN DIEGO BAY                          
            CALIFORNIA
NOAA Chart: 18772                                  Latitude:         32° 42.8' N
USGS Quad:  POINT LOMA                             Longitude:       117° 10.4' W


To reach the tidal bench marks, proceed south on I-5 to 10th Avenue exit
Downtown San Diego.  Turn right on Broadway and proceed to water front (Broadway
Pier).  Turn left at Harbor Drive; then right to the southern face of the Navy
Pier (one pier south of Broadway Pier).  The tidal bench marks are located on
the navy facility in the vicinity. Tide gauge is located in room 5A of the Naval
supply center.


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


                 PRIMARY BENCH MARK STAMPING:  12 1926
                         DESIGNATION:          941 0170 TIDAL 12

MONUMENTATION:           Bench Mark disk                           VM#:      904
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  DC0891
SETTING CLASSIFICATION:  Building


The primary bench mark is a disk set vertically in the west wall of the bay side
of the headquarters building of the 1th Naval District near the foot of
Broadway, 0.40 m (1.3 ft) south of the NW corner of the building, and 0.94 m
(3.1 ft) above ground level.



                         BENCH MARK STAMPING:  0170 S 1991
                         DESIGNATION:          941 0170 S

MONUMENTATION:           Tidal Station disk                        VM#:      105
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete sea wall


The bench mark is a disk set flush in a concrete seawall, 29.69 m (97.4 ft) west
of the centerline of Harbor Drive, 13.72 m (45.0 ft) north of the NE corner of
the Naval Supply Center pier building at 960 North Harbor Drive, 1.62 m (5.3 ft)
north of the southern most concrete walkway railing post, and 0.37 m (1.2 ft)
east of the western edge of the seawall.

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

                                                                                
Station ID: 9410170                                PUBLICATION DATE:  04/21/2003
Name:       SAN DIEGO, SAN DIEGO BAY                          
            CALIFORNIA
NOAA Chart: 18772                                  Latitude:         32° 42.8' N
USGS Quad:  POINT LOMA                             Longitude:       117° 10.4' W


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


                         BENCH MARK STAMPING:  0170 T 1991
                         DESIGNATION:          941 0170 T

MONUMENTATION:           Tidal Station disk                        VM#:      106
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete storm drain slab


The bench mark is a disk set flush in SW Corner of a 1 x 1 m (3 x 3 ft) square
concrete storm drain located in a landscaped area between two sidewalks, 34 m
(110 ft) west of the centerline of North Harbor Drive, 19 m (62 ft) east of the
north-south running seawall, and  16 m (53 ft) north of the centerline of the
entrance drive to the Fish Market Restaurant. 



                         BENCH MARK STAMPING:  0170 V 1991
                         DESIGNATION:          941 0170 V

MONUMENTATION:           Tidal Station disk                        VM#:      107
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete storm drain slab


The bench mark is a disk set flush in the SW corner of a 1 x 1 m (4 x 4 ft)
square storm drain, 18 m (60 ft) SW of the centerline of North Harbor Drive,
11.22 m (36.8 ft) north of a triangular monument cover set in the sidewalk, 9 m
(29 ft) NE of the seawall, and 7.53 m (24.7 ft) west of concrete lamp pole BL27.

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

                                                                                
Station ID: 9410170                                PUBLICATION DATE:  04/21/2003
Name:       SAN DIEGO, SAN DIEGO BAY                          
            CALIFORNIA
NOAA Chart: 18772                                  Latitude:         32° 42.8' N
USGS Quad:  POINT LOMA                             Longitude:       117° 10.4' W


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


                         BENCH MARK STAMPING:  9 1917
                         DESIGNATION:          941 0170 TIDAL 9

MONUMENTATION:           Bench Mark disk                           VM#:      906
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  DC0884
SETTING CLASSIFICATION:  Building


The bench mark is a disk set vertically in the sandstone foundation of the
Federal Building at the intersection of State and F Streets, 9 m (30 ft) SE of a
fire hydrant, 2 m (6 ft) SW of building storm grate, 0.3 m (1 ft) east of NW
corner of building, and 1 m (4 ft) above ground level.



                         BENCH MARK STAMPING:  M 57 1926
                         DESIGNATION:          M 57

MONUMENTATION:           Bench Mark disk                           VM#:      907
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  DC0887
SETTING CLASSIFICATION:  Concrete wall


The bench mark is a disk set vertically in the west concrete wall of the
southern most concrete pillar supporting the west dome on the west side of Santa
Fe (Union) Railway Station, 61 m (200 ft) north of the intersection of the
railroad tracks and Broadway, 0.67 m (2.2 ft) north of the SW corner of the
pillar, and 1.19 m (3.9 ft) above ground level.

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

                                                                                
Station ID: 9410170                                PUBLICATION DATE:  04/21/2003
Name:       SAN DIEGO, SAN DIEGO BAY                          
            CALIFORNIA
NOAA Chart: 18772                                  Latitude:         32° 42.8' N
USGS Quad:  POINT LOMA                             Longitude:       117° 10.4' W


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


                         BENCH MARK STAMPING:  BM 14 A RESET 1943
                         DESIGNATION:          941 0170 TIDAL 14 A RESET

MONUMENTATION:           Bench Mark disk                           VM#:      908
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  DC0888
SETTING CLASSIFICATION:  Concrete curb


The bench mark is a disk set in concrete curbing on south face of the Navy Pier
at the foot of E Street (extended), 10.55 m (34.6 ft) south of door to tide gage
(room 5A), 3.35 m (11.0 ft) west of the western edge of eastern most bollards,
and 0.30 m (1 ft) above level of pier deck.



                         BENCH MARK STAMPING:  NO 16 1974
                         DESIGNATION:          941 0170  TIDAL 16

MONUMENTATION:           Tidal Station disk                        VM#:      909
AGENCY:                  National Ocean Survey (NOS)               PID#:  DC1322
SETTING CLASSIFICATION:  Flagpole foundation


The bench mark is a disk set flush in the top of foundation for three display
flagpoles at foot of Broadway, in the SW corner of the triangular foundation of
the flagpoles, 1.52 m (5.0 ft) south of the extended centerline of Broadway, and
0.61 m (2.0 ft) above ground level.

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

                                                                                
Station ID: 9410170                                PUBLICATION DATE:  04/21/2003
Name:       SAN DIEGO, SAN DIEGO BAY                          
            CALIFORNIA
NOAA Chart: 18772                                  Latitude:         32° 42.8' N
USGS Quad:  POINT LOMA                             Longitude:       117° 10.4' W


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


                         BENCH MARK STAMPING:  0170 N 1977
                         DESIGNATION:          941 0170 N TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:      910
AGENCY:                  National Ocean Survey (NOS)               PID#:  DC1323
SETTING CLASSIFICATION:  Copper-clad steel rod


The bench mark is a disk set near the NE corner of the headquarters building of
the 11th and 12th Naval Districts, 93 m (305 ft) east of the centerline of
Harbor Drive, 16.46 m (54.0 ft) south of the centerline of Broadway, 5 m (16 ft)
ENE of the NE corner of the headquarters building, and 2.96 m ( 9.7 ft) south of
the General Electric control standard.  The bench mark is set flush with the
ground, set on a copper clad 5/8-inch steel rod driven to a depth of 14.6 m (48
ft), and encased in a 4-inch PVC pipe.



                         BENCH MARK STAMPING:  0170 R 1979
                         DESIGNATION:          941 0170 R TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:      911
AGENCY:                  National Ocean Survey (NOS)               PID#:  DC1428
SETTING CLASSIFICATION:  Copper-clad steel rod


The bench mark is a disk located on North Harbor Drive east of the entrance to
the Harbor Seafood Mart, 36 m (119 ft) north of the NE corner of the Harbor
Seafood Mart building, 23 m (74 ft) south of the centerline of North Harbor
Drive, 10 m (34 ft)  east of the centerline of the north entrance road to the
Harbor Seafood Mart, 10 m (33 ft) south of a yellow fire hydrant, and 2.29 m
(7.5 ft) west from the center of a 1 m (2 ft) round cast iron storm drain cover,
near parking meter # 500.  The bench mark is set flush with ground level, set on
a clopper-clad 5/8-inch steel rod driven to a depth of 17.1 m (56 ft), and
encased in a 4-inch PVC pipe.

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

                                                                                
Station ID: 9410170                                PUBLICATION DATE:  04/21/2003
Name:       SAN DIEGO, SAN DIEGO BAY                          
            CALIFORNIA
NOAA Chart: 18772                                  Latitude:         32° 42.8' N
USGS Quad:  POINT LOMA                             Longitude:       117° 10.4' W


                            T I D A L   D A T U M S 


Tidal datums at SAN DIEGO, SAN DIEGO BAY 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 (01/27/1983)         =  2.481
     MEAN HIGHER HIGH WATER                     MHHW   =  1.745
     MEAN HIGH WATER                            MHW    =  1.519
     MEAN TIDE LEVEL                            MTL    =  0.902
     MEAN SEA LEVEL                             MSL    =  0.896
     MEAN LOW WATER                             MLW    =  0.285
     North American Vertical Datum              NAVD88 =  0.132
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (12/17/1937)         = -0.942

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     12 1926                                     5.170    3.650
     0170 S 1991                                 3.786    2.266
     0170 T 1991                                 3.161    1.642
     0170 V 1991                                 2.925    1.406
     9 1917                                      9.768    8.249
     M 57 1926                                   6.646    5.126
     BM 14 A RESET 1943                          3.995    2.476
     NO 16 1974                                  5.161    3.641
     0170 N 1977                                 4.670    3.151
     0170 R 1979                                 3.682    2.162


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

                                                                                
Station ID: 9410170                                PUBLICATION DATE:  04/21/2003
Name:       SAN DIEGO, SAN DIEGO BAY                          
            CALIFORNIA
NOAA Chart: 18772                                  Latitude:         32° 42.8' N
USGS Quad:  POINT LOMA                             Longitude:       117° 10.4' 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.