Superseded Bench Mark Sheet for 9448657, Turner Bay WA

Present Epoch

Printable version

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

                                                   PUBLICATION DATE:  10/04/2000
Station ID: 9448657                                SUPERCEDED DATE:   04/21/2003
Name:       TURNER BAY, SIMILK BAY                            
            WASHINGTON
NOAA Chart: 18427                                  Latitude:         48° 26.7' N
USGS Quad:  CRESCENT HARBOR                        Longitude:       122° 33.3' W


To reach the tidal bench marks from Anacortes drive east out of town on Highway
20, turn right on Reservation Road, turn right on second paved road and then
left on unpaved private road to dock.  You will need permission of the landowner
to open the gate across the private drive.  The tidal bench marks are located
along the road on the west side of the jetty owned by Culbertson Marine
Construction Company.   


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


                 PRIMARY BENCH MARK STAMPING:  SITC NAVD 88
                         DESIGNATION:          944 8657 SITC NAVD

MONUMENTATION:           Bench Mark disk                           VM#:    16175
AGENCY:                  Swinomish Indian Tribal Community (SITC)  PID:         
SETTING CLASSIFICATION:  Concrete pavement


The bench mark is a disk set in concrete pavement located on western end of spit
on east side of the waterways that runs along Jetty owned by Culbertson Marine
Construction at Turner Bay, 165 m (541 ft) east of center road, and 10m (33 ft)
east of west end of spit.  



                         BENCH MARK STAMPING:  8657 A 2000
                         DESIGNATION:          944 8657 A

MONUMENTATION:           Tidal Station disk                        VM#:    16176
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete foundation


The bench mark is a disk set horizontally for a boat skid at the end of a jetty
owned by Culbertson Marine Construction in Turner Bay, 6.92 m (22.7 ft) west of
east side of skid, 1.16 m (3.8 ft) below the highest part of the skid on east
side, 0.15 m (0.5 ft) north of south edge of the foundation, and 0.12 m (0.4 ft)
east of west edge of foundation. 

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

                                                   PUBLICATION DATE:  10/04/2000
Station ID: 9448657                                SUPERCEDED DATE:   04/21/2003
Name:       TURNER BAY, SIMILK BAY                            
            WASHINGTON
NOAA Chart: 18427                                  Latitude:         48° 26.7' N
USGS Quad:  CRESCENT HARBOR                        Longitude:       122° 33.3' W


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


                         BENCH MARK STAMPING:  8657 B 2000
                         DESIGNATION:          944 8657 B

MONUMENTATION:           Tidal Station disk                        VM#:    16177
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Bedrock


The bench mark is a disk set in bedrock below a Madrona tree with a witness sign
in a small cove near west side of a jetty owned by Culbertson Marine
Construction in Turner Bay, 30 m (98 ft) west of middle of a road on jetty, 10 m
(33 ft) west of west side of jetty, and 4.14 m (13.6 ft) south of a large fire
tree with a wire rope around trunk. 



                         BENCH MARK STAMPING:  8657 C 2000
                         DESIGNATION:          944 8657 C

MONUMENTATION:           Tidal Station disk                        VM#:    16178
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Bedrock


The bench mark is a disk set on west side of a road leading to a jetty owned by
Culbertson Marine Construction on Turner Bay, 19.8 m (65.0 ft) north of northern
most corner of a welding shop, 6.10 m (20.0 ft) west of middle of a road on
jetty, and 0.91 m (3.0 ft) above grade.

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

                                                   PUBLICATION DATE:  10/04/2000
Station ID: 9448657                                SUPERCEDED DATE:   04/21/2003
Name:       TURNER BAY, SIMILK BAY                            
            WASHINGTON
NOAA Chart: 18427                                  Latitude:         48° 26.7' N
USGS Quad:  CRESCENT HARBOR                        Longitude:       122° 33.3' W


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


                         BENCH MARK STAMPING:  8657 D 2000
                         DESIGNATION:          944 8657 D

MONUMENTATION:           Tidal Station disk                        VM#:    16179
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Bedrock


The bench mark is a disk set on a road leading to a jetty owned by Culbertson
Marine Construction on Turner Bay, 137 m (450 ft) west of northern point of a
small island in channel, 100 m (328 ft) north of north end of pond on west side
of road, 6.55 m (21.5 ft) west of center of road, 2.25 m (7.4 ft) north of an
orange NOS witness post, and 0.91 m (3.0 ft) above grade.

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

                                                   PUBLICATION DATE:  10/04/2000
Station ID: 9448657                                SUPERCEDED DATE:   04/21/2003
Name:       TURNER BAY, SIMILK BAY                            
            WASHINGTON
NOAA Chart: 18427                                  Latitude:         48° 26.7' N
USGS Quad:  CRESCENT HARBOR                        Longitude:       122° 33.3' W


                            T I D A L   D A T U M S 


Tidal datums at TURNER BAY, SIMILK BAY based on:

     LENGTH OF SERIES:      174 hws and 173 lws
     TIME PERIOD:           June 1 -- August 29, 2000
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  9449880 FRIDAY HARBOR, SAN JUAN CHANNEL


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

     MEAN HIGHER HIGH WATER                     MHHW   =  3.165
     MEAN HIGH WATER                            MHW    =  2.887
     MEAN TIDE LEVEL                            MTL    =  1.841
     MEAN SEA LEVEL                             MSL    =  1.816
     MEAN LOW WATER                             MLW    =  0.796
     North American Vertical Datum              NAVD88 =  0.505
     MEAN LOWER LOW WATER                       MLLW   =  0.000



Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     SITC NAVD 88                                3.888    1.001
     8657 A 2000                                 4.329    1.442
     8657 B 2000                                 4.679    1.792
     8657 C 2000                                 5.614    2.727
     8657 D 2000                                 6.303    3.416


Foot Notes:

* The NAVD 88 elevation for Bench Mark SITC NAVD 88 was determined through a
survey by Reid Middleton, Inc and provided to the National Ocean Service (NOS)
at the request of the Swinomish Indian Tribal  Community (SITC) for establishing
the relationship between tidal datums and the geodetic datum NAVD88 and other
bench marks in the leveling network on Fidalgo Island.

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

                                                   PUBLICATION DATE:  10/04/2000
Station ID: 9448657                                SUPERCEDED DATE:   04/21/2003
Name:       TURNER BAY, SIMILK BAY                            
            WASHINGTON
NOAA Chart: 18427                                  Latitude:         48° 26.7' N
USGS Quad:  CRESCENT HARBOR                        Longitude:       122° 33.3' 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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