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

                                                                                
Station ID: 9450625                         PUBLICATION DATE:  09/05/2003
Name:       LINDEMAN COVE                                     
            AK
NOAA Chart: 17426                           Latitude:   55° 36.1' N (  55.60170)
USGS Quad:  CRAIG (B-2)                     Longitude: 132° 30.7' W (-132.51200)


To reach the tidal bench marks from Ketchikan, go NW 64.8 km (35 nm) to the
northern-most extent of Kasaan Bay to Lindeman Cove.  The tidal bench marks are
located along the beach.  The tide gauge was built at a new site on a sparcely
wooded point immediately east of the entrance to Linderman Cove.  


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


                 PRIMARY BENCH MARK STAMPING:  0625 C 2002
                         DESIGNATION:          945 0625 C

MONUMENTATION:           Tidal Station disk                    VM#:        16877
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   55° 36.1' N (  55.60170)          LONGITUDE: 132° 30.7' W (-132.51200)


The primary bench mark is a disk set into the top of the third grey rock outcrop
east of Linderman Cove, which outcrop marks the western-most point of the
entrance to the first large bay east of Linderman Cove, 6.0 m (19.7 ft) north of
seaward extent and 4.0 m (13.1 ft) from the west edge of the outcrop, 44.7 m
(146.6 ft) NW of Bench Mark 0625 B 2002 and separated by rocky beach, 87.8 m
(288.0 ft) NE to Bench Mark 0625 D 2002 and separated by a steep rock, 6.0 m
(19.7 ft) south of tree line, and 3.0 m (9.8 ft)  above the apparent high water
line.  

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

                                                                                
Station ID: 9450625                         PUBLICATION DATE:  09/05/2003
Name:       LINDEMAN COVE                                     
            AK
NOAA Chart: 17426                           Latitude:   55° 36.1' N (  55.60170)
USGS Quad:  CRAIG (B-2)                     Longitude: 132° 30.7' W (-132.51200)


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


                         BENCH MARK STAMPING:  0625 A 2002
                         DESIGNATION:          945 0625 A

MONUMENTATION:           Tidal Station disk                    VM#:        16875
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   55° 36.2' N (  55.60330)          LONGITUDE: 132° 30.7' W (-132.51200)


The bench mark is a disk set into the top of the south eastern-most extent of
the first grey rock outcrop east of Linderman Cove, 6.00 m (19.7 ft) NNE of
outcrop seaward extent, 29.9 m (98.1 ft) NW of Bench Mark 0625 B 2002 and
separated by rocky beach, 4.0 m (13.1 ft) south of tree line, and 2.0 m (6.6 ft)
 above the apparent high water line.



                         BENCH MARK STAMPING:  0625 B 2002
                         DESIGNATION:          945 0625 B

MONUMENTATION:           Tidal Station disk                    VM#:        16876
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   55° 36.2' N (  55.60330)          LONGITUDE: 132° 30.7' W (-132.51200)


The bench mark is a disk set into the top of the second grey rock outcrop east
of Linderman Cove, 8.0 m (26.3 ft) north of the seaward extent and 6.5 m (21.3
ft) from the east edge of the outcrop, 29.9 m (98.1 ft) SE of Bench Mark 0625 A
2002 and separated by rocky beach, 44.7 m (146.6 ft) SE to Bench Mark 0625 C
2002 and separated by rocky beach, 5.00 m (16.4 ft) SW of tree line, and 2.0 m
(6.6 ft)  above the apparent high water line.

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

                                                                                
Station ID: 9450625                         PUBLICATION DATE:  09/05/2003
Name:       LINDEMAN COVE                                     
            AK
NOAA Chart: 17426                           Latitude:   55° 36.1' N (  55.60170)
USGS Quad:  CRAIG (B-2)                     Longitude: 132° 30.7' W (-132.51200)


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


                         BENCH MARK STAMPING:  0625 D 2002
                         DESIGNATION:          945 0625 D

MONUMENTATION:           Tidal Station disk                    VM#:        16878
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   55° 36.2' N (  55.60330)          LONGITUDE: 132° 30.6' W (-132.51000)


The bench mark is a disk set in a flat ledge of a shear black rock outcrop that
drops off to the south and east located at the head of the west side of the
first large bay east of Linderman Cove, 2.32 m (7.6 ft) to tbe east and 4.20 m
(13.8 ft) to the south edge of outcrop, 87.8 m (288.0 ft) SW to Bench Mark 0625
C 2002 and separated by a steep rock, 62.0 m (203.4 ft) ESE to Bench Mark 0625 E
2002 and separated by rocky beach, 26.0 m (85.3 ft) NE to treeline at head of
bay, and 2.0 m (6.6 ft)  above the apparent high water line.



                         BENCH MARK STAMPING:  0625 E 2002
                         DESIGNATION:          945 2002 E

MONUMENTATION:           Tidal Station disk                    VM#:        16879
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   55° 36.2' N (  55.60330)          LONGITUDE: 132° 30.6' W (-132.51000)


The bench mark is a disk set in top of the first grey rock outcrop east of the
west side of the first large bay east of Linderman Cove, 7 m (23 ft) north of
the seaward extent and 5.0 m (16.4 ft) from the east edge of the outcrop, 62.0 m
(203.4 ft) WNW of Bench Mark 0625 D 2002 and separated by rocky beach, 2.0 m
(6.6 ft) south of tree line, and 1.5 m (4.9 ft) above the apparent high water
line.

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

                                                                                
Station ID: 9450625                         PUBLICATION DATE:  09/05/2003
Name:       LINDEMAN COVE                                     
            AK
NOAA Chart: 17426                           Latitude:   55° 36.1' N (  55.60170)
USGS Quad:  CRAIG (B-2)                     Longitude: 132° 30.7' W (-132.51200)


                            T I D A L   D A T U M S 


Tidal datums at LINDEMAN COVE based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           August 2002 - September 2002
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9450460 KETCHIKAN, TONGASS NARROWS


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

     MEAN HIGHER HIGH WATER                     MHHW   =  4.802
     MEAN HIGH WATER                            MHW    =  4.528
     MEAN TIDE LEVEL                            MTL    =  2.505
     MEAN SEA LEVEL                             MSL    =  2.502
     MEAN LOW WATER                             MLW    =  0.483
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     0625 C 2002                                 7.333    2.805
     0625 A 2002                                 6.835    2.307
     0625 B 2002                                 6.843    2.315
     0625 D 2002                                 6.219    1.691
     0625 E 2002                                 6.568    2.040


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

                                                                                
Station ID: 9450625                         PUBLICATION DATE:  09/05/2003
Name:       LINDEMAN COVE                                     
            AK
NOAA Chart: 17426                           Latitude:   55° 36.1' N (  55.60170)
USGS Quad:  CRAIG (B-2)                     Longitude: 132° 30.7' W (-132.51200)


                             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.