U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  6

                                                                                
Station ID: 8452660                                PUBLICATION DATE:  04/21/2003
Name:       NEWPORT, NARRAGANSETT BAY                         
            RHODE ISLAND
NOAA Chart: 13223                                  Latitude:         41° 30.3' N
USGS Quad:  NEWPORT                                Longitude:        71° 19.6' W


To reach the tidal bench marks from the traffic circle at the intersection of
James T. Connell Memorial Road (State Route 238) and State Route 138 proceed
west for 0.5 km (0.3 mi) to Coasters Harbor Island U.S. Naval Complex gate. 
Continue west on Luce Avenue for 0.2 km (0.1 mi) to Perry Road, south on Perry
for 0.2 km (0.1 mi) to a small boat pier.  The gage and staff are located at the
east end of the pier.  The bench marks are located within U.S. Naval Complex.


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


                 PRIMARY BENCH MARK STAMPING:  6 1943
                         DESIGNATION:          845 2660 TIDAL 6

MONUMENTATION:           Tidal Station disk                        VM#:      221
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  LW0493
SETTING CLASSIFICATION:  Concrete slab


The primary bench mark is a disk set in the top of a concrete slab, located at
the intersection of Luce Avenue and Perry Road along the NW side of a small boat
basin, 82.0 m (269 ft) NE of bench mark NO 4 1934, 16.15 m (53.0 ft) SW of the
centerline of Luce Avenue, 0.40 m (1.3 ft) SW of the NE end of the slab, and
0.15 m (0.5 ft) NW of the basin's wooden bulkhead.



                         BENCH MARK STAMPING:  NO 1 1930
                         DESIGNATION:          845 2660 TIDAL 1

MONUMENTATION:           Tidal Station disk                        VM#:      218
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  LW0489
SETTING CLASSIFICATION:  Building


The bench mark is a disk set vertically in the face of a granite block building
located at the intersection of Luce Avenue and Cushing Road, 23.41 m (76.8 ft)
north of the centerline of Luce Avenue, 5.49 m (18.0 ft) SW of the centerline of
Cushing Road, 0.82 m (2.7 ft) south of the NE corner of the south wing of the
building, and 0.06 m (0.2 ft) above ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8452660                                PUBLICATION DATE:  04/21/2003
Name:       NEWPORT, NARRAGANSETT BAY                         
            RHODE ISLAND
NOAA Chart: 13223                                  Latitude:         41° 30.3' N
USGS Quad:  NEWPORT                                Longitude:        71° 19.6' W


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


                         BENCH MARK STAMPING:  NO 4 1934
                         DESIGNATION:          845 2660 TIDAL 4

MONUMENTATION:           Tidal Station disk                        VM#:      219
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  LW0491
SETTING CLASSIFICATION:  Concrete slab


The bench mark is a disk set on top of a concrete slab, located 0.24 km (0.15
mi) SE along Luce Avenue from the east side of the War College Building, thence
0.08 km (0.05 mi) SE along Perry Road, on the NW side of a small boat basin,
9.60 m (31.5 ft) SE of the centerline of Perry Road, 0.76 m (2.5 ft) NW of the
east corner of brick Building No. 91, 0.24 m (0.8 ft) NW of the NW side of the
building, and 0.15 m (0.5 ft) NW of a wooden bulkhead.



                         BENCH MARK STAMPING:  2660 G 1976
                         DESIGNATION:          845 2660 G

MONUMENTATION:           Tidal Station disk                        VM#:      222
AGENCY:                  National Ocean Survey (NOS)               PID#:  AH9447
SETTING CLASSIFICATION:  Concrete slab


The bench mark is a disk set in a concrete slab, located 64.0 m (210 ft) west of
the NW corner of the intersection of Perry Road and Luce Avenue, 30.78 m (101.0
ft) west of the SW corner of tennis courts, 30.36 m (99.6 ft) east of the NE
corner of the intersection of Luce Avenue and Bainbridge Road, and 5.49 m (18.0
ft) north of the centerline of Luce Avenue.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8452660                                PUBLICATION DATE:  04/21/2003
Name:       NEWPORT, NARRAGANSETT BAY                         
            RHODE ISLAND
NOAA Chart: 13223                                  Latitude:         41° 30.3' N
USGS Quad:  NEWPORT                                Longitude:        71° 19.6' W


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


                         BENCH MARK STAMPING:  2660 K 1979
                         DESIGNATION:          845 2660 K

MONUMENTATION:           Tidal Station disk                        VM#:      225
AGENCY:                  National Ocean Survey (NOS)               PID:         
SETTING CLASSIFICATION:  Bedrock


The bench mark is a disk set in bedrock, located north of Founders Hall, 63.1 m
(207 ft) north of the west wing of the Naval War College Museum, 52.19 m (171.2
ft) east of the centerline of Cushing Road, 9.28 m (30.4 ft) NW of the NW corner
of the wooden fence around a residence, and 4.80 m (15.7 ft) SE of the SE curb
of the road leading to a parking lot.



                         BENCH MARK STAMPING:  7
                         DESIGNATION:          845 2660 TIDAL 7
                         ALIAS:                7

MONUMENTATION:           Survey disk                               VM#:      226
AGENCY:                  New England Survey Service, Inc. (Private) PID:         
SETTING CLASSIFICATION:  Concrete base of flagpole


The bench mark is a disk set in the concrete base of a flag pole, located in
front of the Naval War College Museum in the immediate vicinity of two 24-pound
Howitzer cannons, 38.10 m (125.0 ft) SE of Light Pole No. USN 25-1, 12.80 m
(42.0 ft) south of the centerline of Luce Avenue, 7.50 m (24.6 ft) north of the
north face of the 1938 War Monument, and 1.90 m (6.2 ft) SSW of the flag pole.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8452660                                PUBLICATION DATE:  04/21/2003
Name:       NEWPORT, NARRAGANSETT BAY                         
            RHODE ISLAND
NOAA Chart: 13223                                  Latitude:         41° 30.3' N
USGS Quad:  NEWPORT                                Longitude:        71° 19.6' W


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


                         BENCH MARK STAMPING:  2660 L 1986
                         DESIGNATION:          845 2660 L

MONUMENTATION:           Tidal Station disk                        VM#:      228
AGENCY:                  National Ocean Survey (NOS)               PID#:  AH9448
SETTING CLASSIFICATION:  Stainless steel rod


The bench mark is a disk located at the NW corner of a parking lot at Building
No. 95, 85.0 m (279 ft) west of the centerline of Perry Road, 74.1 m (243 ft)
north of the NW corner of Building No. 95, and 3.00 m (9.8 ft) north of the NW
corner of the parking lot. The bench mark is crimped to a stainless steel rod
driven to an unspecified depth, and encased in a 6 inch PVC pipe with concrete
kickblock.



                         BENCH MARK STAMPING:  2660 M 2001
                         DESIGNATION:          845 2660 M

MONUMENTATION:           Tidal Station disk                        VM#:    16542
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete landing


The bench mark is a disk set in the concrete landing at the top of four steps to
the service entrance on the east side of the Officer's Club (building number
95), 12.60 m (41.3 ft) south of the center of an electrical manhole cover, 10.30
m (33.8 ft) west of the centerline of the road, and 1.40 m (4.6 ft) NW of the NE
corner of the building.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8452660                                PUBLICATION DATE:  04/21/2003
Name:       NEWPORT, NARRAGANSETT BAY                         
            RHODE ISLAND
NOAA Chart: 13223                                  Latitude:         41° 30.3' N
USGS Quad:  NEWPORT                                Longitude:        71° 19.6' W


                            T I D A L   D A T U M S 


Tidal datums at NEWPORT, NARRAGANSETT 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 (09/21/1938)         =  4.056
     MEAN HIGHER HIGH WATER                     MHHW   =  1.174
     MEAN HIGH WATER                            MHW    =  1.099
     North American Vertical Datum              NAVD88 =  0.622
     MEAN TIDE LEVEL                            MTL    =  0.571
     MEAN SEA LEVEL                             MSL    =  0.529
     MEAN LOW WATER                             MLW    =  0.042
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (02/03/1976)         = -0.943

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6 1943                                      2.236    1.137
     NO 1 1930                                  10.811    9.712
     NO 4 1934                                   2.062    0.963
     2660 G 1976                                 5.989    4.891
     2660 K 1979                                16.024   14.925
     7                                           8.667    7.568
     2660 L 1986                                 3.536    2.438
     2660 M 2001                                 2.911    1.812


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

                                                                                
Station ID: 8452660                                PUBLICATION DATE:  04/21/2003
Name:       NEWPORT, NARRAGANSETT BAY                         
            RHODE ISLAND
NOAA Chart: 13223                                  Latitude:         41° 30.3' N
USGS Quad:  NEWPORT                                Longitude:        71° 19.6' 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.