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

                                                                                
Station ID: 8419528                         PUBLICATION DATE:  05/20/2004
Name:       FORT POINT, YORK HARBOR                           
            ME
NOAA Chart: 13283                           Latitude:   43°  7.8' N (  43.13000)
USGS Quad:  YORK HARBOR                     Longitude:  70° 38.3' W ( -70.63830)


To reach the tidal bench marks from the intersection of U.S. Highway 1A and
Harbor Beach Road in Fort Point, proceed 0.3 km (0.2 mi) SSW on Harbor Beach
Road to Stage Neck Inn Restaurant.  The bench marks are located on the property
of Stage Neck Inn Restaurant.  The tide gage and staff was bolted to a large
boulder at the approximate waters edge at low tide.


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


                 PRIMARY BENCH MARK STAMPING:  9528 A 1976
                         DESIGNATION:          841 9528 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         1959
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Rock outcropping                      OPUS PID:        
LATITUDE:   43°  7.8' N (  43.13000)          LONGITUDE:  70° 38.3' W ( -70.63830)


The primary bench mark is a disk set in a rock outcropping in the east yard of
Stage Neck Inn Restaurant, 2 m (5 ft) east of the SE corner of a concrete patio
at the east side of the restaurant.



                         BENCH MARK STAMPING:  9528 B 1976
                         DESIGNATION:          841 9528 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         1960
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Rock outcropping                      OPUS PID:        
LATITUDE:   43°  7.8' N (  43.13000)          LONGITUDE:  70° 38.3' W ( -70.63830)


The bench mark is a disk set in a rock outcropping at the base of a thickly
vegetated area in the NE yard of Stage Neck Inn Restaurant, 28 m (91 ft) south
of the north cliff edge, and 21 m (70 ft) west of the east cliff edge.

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

                                                                                
Station ID: 8419528                         PUBLICATION DATE:  05/20/2004
Name:       FORT POINT, YORK HARBOR                           
            ME
NOAA Chart: 13283                           Latitude:   43°  7.8' N (  43.13000)
USGS Quad:  YORK HARBOR                     Longitude:  70° 38.3' W ( -70.63830)


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


                         BENCH MARK STAMPING:  9528 C 1976
                         DESIGNATION:          841 9528 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         1961
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Rock outcropping                      OPUS PID:        
LATITUDE:   43°  7.8' N (  43.13000)          LONGITUDE:  70° 38.3' W ( -70.63830)


The bench mark is a disk set in a rock outcropping in the NE yard of Stage Neck
Inn Restaurant, 20 m (64 ft) south of the north cliff edge, 16 m (54 ft) west of
the east cliff edge, and 2 m (7 ft) NNE of the thickly vegetated area around
bench mark 9528 B 1976.



                         BENCH MARK STAMPING:  9528 D 1976
                         DESIGNATION:          841 9528 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         1962
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Rock outcropping                      OPUS PID:        
LATITUDE:   43°  7.8' N (  43.13000)          LONGITUDE:  70° 38.3' W ( -70.63830)


The bench mark is a disk set in a rock outcropping in the NE yard of Stage Neck
Inn Restaurant, NE of the NE corner of the restaurant, 26 m (85 ft) ESE of bench
mark 9528 E 1976.

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

                                                                                
Station ID: 8419528                         PUBLICATION DATE:  05/20/2004
Name:       FORT POINT, YORK HARBOR                           
            ME
NOAA Chart: 13283                           Latitude:   43°  7.8' N (  43.13000)
USGS Quad:  YORK HARBOR                     Longitude:  70° 38.3' W ( -70.63830)


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


                         BENCH MARK STAMPING:  9528 E 1976
                         DESIGNATION:          841 9528 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         1963
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Rock outcropping                      OPUS PID:        
LATITUDE:   43°  7.8' N (  43.13000)          LONGITUDE:  70° 38.3' W ( -70.63830)


The bench mark is a disk set in a rock outcropping between two footpaths in the
north yard of Stage Neck Inn Restaurant, 11 m (36 ft) north of the north wall of
the restaurant, and 9 m (29 ft) south of the north cliff edge.

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

                                                                                
Station ID: 8419528                         PUBLICATION DATE:  05/20/2004
Name:       FORT POINT, YORK HARBOR                           
            ME
NOAA Chart: 13283                           Latitude:   43°  7.8' N (  43.13000)
USGS Quad:  YORK HARBOR                     Longitude:  70° 38.3' W ( -70.63830)


                            T I D A L   D A T U M S 


Tidal datums at FORT POINT, YORK HARBOR based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           September 1976 - September 1976
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8419870 SEAVEY ISLAND, PORTSMOUTH HARBOR


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

     MEAN HIGHER HIGH WATER                     MHHW   =  2.872
     MEAN HIGH WATER                            MHW    =  2.745
     MEAN SEA LEVEL                             MSL    =  1.439
     MEAN TIDE LEVEL                            MTL    =  1.421
     MEAN LOW WATER                             MLW    =  0.097
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     9528 A 1976                                 9.405    6.660
     9528 B 1976                                10.497    7.752
     9528 C 1976                                10.349    7.604
     9528 D 1976                                10.222    7.477
     9528 E 1976                                 9.035    6.290


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

                                                                                
Station ID: 8419528                         PUBLICATION DATE:  05/20/2004
Name:       FORT POINT, YORK HARBOR                           
            ME
NOAA Chart: 13283                           Latitude:   43°  7.8' N (  43.13000)
USGS Quad:  YORK HARBOR                     Longitude:  70° 38.3' W ( -70.63830)


                             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 NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.

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.