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Superseded Bench Mark Sheet for 8575512, Annapolis MD

Present Epoch

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

                                                   PUBLICATION DATE:  05/07/1986
Station ID: 8575512                                SUPERCEDED DATE:   04/21/2003
Name:       ANNAPOLIS (U.S. NAVAL ACADEMY), SEVERN RIVER, CHES
            MARYLAND
NOAA Chart: 12282                                  Latitude:         38° 59.0' N
USGS Quad:  ANNAPOLIS                              Longitude:        76° 28.8' W


To reach the tidal bench marks from gate number 8 of the U.S. Naval Academy,
proceed SE on Bowyer Road over a bridge to McNair Road, continue NE on McNair
Road to Santee Road, proceed on Santee Road for 0.3 mile (0.5 km) to Santee
Basin.  The bench marks are located within the U.S. Naval Academys grounds. The
gage and staff are located on Santee Pier in the Oceanography Laboratory
Building.


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


                 PRIMARY BENCH MARK STAMPING:  7

MONUMENTATION:           Survey Disk                               VM#:      438
AGENCY:                                                            PID#:  HV0207
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is located near the northern corner of Luce Hall, 18.2 feet (5.5
m) SW of the edge of the sidewalk on the south side of Santee Road, 14.6 feet
(4.5 m) NE of the NE edge of the sidewalk entrance to Luce Hall, 10.6 feet (3.2
m) NW of the ironwood (locust tree), and 9 feet (3 m) SE of the oriental
monument, and is set in a concrete monument, 0.2 foot (0.1 m) below ground
level.



                         BENCH MARK STAMPING:  4A 1928

MONUMENTATION:           Survey Disk                               VM#:      439
AGENCY:                                                            PID#:  HV0203
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is located along the walk parallel to the SW face of Sampson
Hall, 100 feet (30 m) NW of the Maryland Ave. curb, and 52 feet (16 m) NE of the
Decatur Road curb, and is level with the ground, set flush in the top of a
concrete monument.

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

                                                   PUBLICATION DATE:  05/07/1986
Station ID: 8575512                                SUPERCEDED DATE:   04/21/2003
Name:       ANNAPOLIS (U.S. NAVAL ACADEMY), SEVERN RIVER, CHES
            MARYLAND
NOAA Chart: 12282                                  Latitude:         38° 59.0' N
USGS Quad:  ANNAPOLIS                              Longitude:        76° 28.8' W


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


                         BENCH MARK STAMPING:  1 1928

MONUMENTATION:           Survey Disk                               VM#:      440
AGENCY:                                                            PID#:  HV0208
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is located near the NE face of Luce Hall, 45 feet (14 m) SW of
the centerline of Santee Road, 37.7 feet (11.5 m) NW of the Civil War Histor-
ical sign, 29 feet (9 m) SE of the centerline of Luce Hall, 26.5 feet (8.1 m)
SSW of the fire hydrant, 6 feet (2 m) SW of the SW edge of the sidewalk, and 4.2
feet (1.3 m) NE of the NE face of Luce Hall, and is 0.1 foot (0.03 m) below
ground level, set flush in the top of a concrete monument.



                         BENCH MARK STAMPING:  2 1928

MONUMENTATION:           Survey Disk                               VM#:      441
AGENCY:                                                            PID#:  HV0206
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is located in the area bounded by Chauvenet Walk, Stribling
Walks, Chapel Walks, and Buchanan Road, 202 feet (62 m) SE of the centerline of
Chapel Walks, 136 feet (41 m) SW of the centerline of Stribling Walks, and 69.1
feet (21.1 m) NE of the northern edge of Chauvenet Walk, and is 0.2 foot (0.1 m)
below ground level, set flush in the top of a concrete monument.

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

                                                   PUBLICATION DATE:  05/07/1986
Station ID: 8575512                                SUPERCEDED DATE:   04/21/2003
Name:       ANNAPOLIS (U.S. NAVAL ACADEMY), SEVERN RIVER, CHES
            MARYLAND
NOAA Chart: 12282                                  Latitude:         38° 59.0' N
USGS Quad:  ANNAPOLIS                              Longitude:        76° 28.8' W


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


                         BENCH MARK STAMPING:  3 1928

MONUMENTATION:           Survey Disk                               VM#:      442
AGENCY:                                                            PID#:  HV0205
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is located in an area bounded by Stribling Walks, Chauvenet Walk,
Chapel Walks, and Maryland Avenue, approximately 200 feet (61 m) NW of the
centerline of Chapel Walks, 60.5 feet (18.4 m) SE of a tree between Chapel
Walks, 59.4 feet (18.1 m) west from the center of a manhole cover.  The bench
mark is 0.2 foot (0.1 m) below ground level, and set flush in the top of a
concrete monument.



                         BENCH MARK STAMPING:  5 1928

MONUMENTATION:           Survey Disk                               VM#:      443
AGENCY:                                                            PID#:  HV0204
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is located in an area bounded by Chauvenet Walk, Blake Road,
Maryland Avenue and Chapel Walks, 138 feet (42 m) SE of the SE curb of Maryland
Avenue, 101.5 feet (30.9 m) SW of the SW edge of Chauvenet Walk, 65.5 feet (20.0
m) NE of the NE curb of Blake Road, 44 feet (13 m) south of the south edge of an
east-west walk, and is level with the ground, set flush in a concrete monument.

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

                                                   PUBLICATION DATE:  05/07/1986
Station ID: 8575512                                SUPERCEDED DATE:   04/21/2003
Name:       ANNAPOLIS (U.S. NAVAL ACADEMY), SEVERN RIVER, CHES
            MARYLAND
NOAA Chart: 12282                                  Latitude:         38° 59.0' N
USGS Quad:  ANNAPOLIS                              Longitude:        76° 28.8' W


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


                         BENCH MARK STAMPING:  5510 A 1978

MONUMENTATION:           Survey Disk                               VM#:      444
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Stainless Steel Rod


The bench mark is located near the SE face of Luce Hall, 20.2 feet (6.2 m) SW of
the east corner of Luce Hall, 14.3 feet (4.4 m) NE of the centerline of the SE
entrance to Luce Hall, and 1.7 feet (0.5 m) SE of the SE wall of Luce Hall. The
bench mark is 0.1 foot (0.03 m) below ground level, crimped to a stainless steel
rod driven 42 feet (13 m) to refusal, and encased in a 4-inch PVC pipe and
concrete kickblock.



                         BENCH MARK STAMPING:  5510 C 1979

MONUMENTATION:           Survey Disk                               VM#:      445
AGENCY:                                                            PID#:  AC6863
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is located near the west end of Santee Basin, 115.0 feet (35.1 m)
east of the centerline of Sims Road, 27.0 feet (8.2 m) south of the centerline
of Santee Pier, and 4.4 feet (1.3 m) north of the south edge of the pier, and is
set flush in the SE corner of a 5-foot by 5-foot (2 m x 2 m) concrete foundation
of a small boat crane.



                         BENCH MARK STAMPING:  5510 D 1979

MONUMENTATION:           Survey Disk                               VM#:      446
AGENCY:                                                            PID#:  HV8839
SETTING CLASSIFICATION:  Concrete Pier Cap


The bench mark is located at the NE corner of Santee Pier, 35.8 feet (10.9 m)
east of the NE corner of the wooden pump house, 32.0 feet (9.8 m) NE of the NE
corner of the oceanographic field laboratory, and 13.0 feet (4.0 m) SE of the
northerly set of bollards.  The bench mark is set flush in a concrete pier cap.

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

                                                   PUBLICATION DATE:  05/07/1986
Station ID: 8575512                                SUPERCEDED DATE:   04/21/2003
Name:       ANNAPOLIS (U.S. NAVAL ACADEMY), SEVERN RIVER, CHES
            MARYLAND
NOAA Chart: 12282                                  Latitude:         38° 59.0' N
USGS Quad:  ANNAPOLIS                              Longitude:        76° 28.8' W


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


                         BENCH MARK STAMPING:  5510 B 1978

MONUMENTATION:           Survey Disk                               VM#:     1409
AGENCY:                                                            PID#:  AC6864
SETTING CLASSIFICATION:  Stainless Steel Rod


The bench mark is located in the immediate vicinity of the NW face of Luce Hall,
22.7 feet (6.9 m) NE of the centerline of the NW entrance to Luce Hall, 11.7
feet (3.6 m) SW of the north corner of Luce Hall, and 1.4 feet (0.4 m) NW of the
NW wall of Luce Hall.  The bench mark is 0.1 foot (0.03 m) below ground level,
crimped to a stainless steel rod driven 36 feet (11 m) to refusal, and encased
in a 4-inch PVC pipe and concrete kickblock.

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

                                                   PUBLICATION DATE:  05/07/1986
Station ID: 8575512                                SUPERCEDED DATE:   04/21/2003
Name:       ANNAPOLIS (U.S. NAVAL ACADEMY), SEVERN RIVER, CHES
            MARYLAND
NOAA Chart: 12282                                  Latitude:         38° 59.0' N
USGS Quad:  ANNAPOLIS                              Longitude:        76° 28.8' W


                            T I D A L   D A T U M S 


Tidal datums at ANNAPOLIS (U.S. NAVAL ACADEMY), SEVERN RIVER, CHES based on:

     LENGTH OF SERIES:      18 YEARS
     TIME PERIOD:           1960-1978
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:   


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

     HIGHEST OBSERVED WATER LEVEL (08/23/1933)         =   6.40
     MEAN HIGHER HIGH WATER                     MHHW   =   1.43
     MEAN HIGH WATER                            MHW    =   1.17
     MEAN TIDE LEVEL                            MTL    =   0.70
     MEAN LOW WATER                             MLW    =   0.24
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   0.16
     LOWEST  OBSERVED WATER LEVEL (12/31/1962)         =  -3.70

   * NGVD reference based on elevations published in Quad 380761, 1973, and NOS
     leveling of 1984. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     7                                           5.14      3.97
     4A 1928                                    15.46     14.29
     1 1928                                      5.38      4.21
     2 1928                                     20.27     19.10
     3 1928                                     16.70     15.53
     5 1928                                     22.22     21.05
     5510 A 1978                                 5.74      4.57
     5510 C 1979                                 7.70      6.53
     5510 D 1979                                 5.68      4.51
     5510 B 1978                                 5.85      4.68


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

                                                   PUBLICATION DATE:  05/07/1986
Station ID: 8575512                                SUPERCEDED DATE:   04/21/2003
Name:       ANNAPOLIS (U.S. NAVAL ACADEMY), SEVERN RIVER, CHES
            MARYLAND
NOAA Chart: 12282                                  Latitude:         38° 59.0' N
USGS Quad:  ANNAPOLIS                              Longitude:        76° 28.8' 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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Revised: 08/08/2018
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