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Bench Mark Sheet for 9449856, Kanaka Bay, San Juan Island WA

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

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

                                                                                
Station ID: 9449856                         PUBLICATION DATE:  06/15/2016
Name:       KANAKA BAY, SAN JUAN ISLAND, KANAKA BAY           
            WA
NOAA Chart: 18433                           Latitude:   48° 29.1' N (  48.48500)
USGS Quad:  False Bay                       Longitude: 123°  5.0' W (-123.08300)


To reach the tide station from the Washington State ferry terminal in Friday
Harbor on San Juan Island, proceed 0.1 km (0.05 mi) east on Front St, turn left
onto Spring St and proceed 1.3 km (0.8 mi) SW, continue straight 1.3 km (0.8 mi)
SW as the road turns into San Juan Valley Rd to the intersection with Douglas
Rd, turn left onto Douglas Rd and proceed 2.7 km (1.7 mi) south, turn right onto
Bailer Hill Rd and proceed west 2.9 km (1.8 mi) to the intersection with Kanaka
Bay Rd, turn left onto the private Kanaka Bay Rd and proceed 1.4 km (0.9 mi)
south to the intersection with the private unmarked Pile Point Ln, turn right
onto the private Pile Point Ln and then make an immediate left onto the grass
path, which is passable with a car, through the trees and proceed 0.3 km (0.2
mi) south to the tide station and bench marks on the rock outcrop shoreline on
the right.


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


                 PRIMARY BENCH MARK STAMPING:  1 1926
                         DESIGNATION:          944 9856 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:        21707
AGENCY:                  United States Coast and Geodetic SurveyIDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   48° 29.0' N (  48.48414)          LONGITUDE: 123°  5.0' W (-123.08331)


The primary bench mark is a disk set in rock outcrop along the shoreline,  6.50
m (21.3 ft) WSW of edge of vegetation at top of rock outcrop and 0.93 m (3.1 ft)
ENE of seaward edge of rock ledge.

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

                                                                                
Station ID: 9449856                         PUBLICATION DATE:  06/15/2016
Name:       KANAKA BAY, SAN JUAN ISLAND, KANAKA BAY           
            WA
NOAA Chart: 18433                           Latitude:   48° 29.1' N (  48.48500)
USGS Quad:  False Bay                       Longitude: 123°  5.0' W (-123.08300)


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


                         BENCH MARK STAMPING:  NO. 3 1926
                         DESIGNATION:          944 9856 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:        21708
AGENCY:                  United States Coast & Geodetic
                         Survey                                    IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   48° 29.1' N (  48.48436)          LONGITUDE: 123°  5.1' W (-123.08417)


The benchmark is a disk set in rock outcrop on the island, 24.70 m (81.0 ft) ESE
of the west side of the island, 13.95 m (45.8 ft) N of the south point of the
rock island, 6.90 m (22.6 ft) SSE of the highest point of rock on the island and
1.80 m (5.9 ft) WNW of the eastern edge of the rock ledge.



                         BENCH MARK STAMPING:  4 1944
                         DESIGNATION:          944 9856 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:        21709
AGENCY:                  United States Coast & Geodetic
                         Survey                                    IDB PID#:  TR0729
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   48° 29.1' N (  48.48428)          LONGITUDE: 123°  5.0' W (-123.08333)


The benchmark is a disk set in rock outcrop along the shoreline, 1.92 m (6.3 ft)
SE of seaward edge of rock ledge and 1.39 m (4.6 ft) WSW of vegetation line.

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

                                                                                
Station ID: 9449856                         PUBLICATION DATE:  06/15/2016
Name:       KANAKA BAY, SAN JUAN ISLAND, KANAKA BAY           
            WA
NOAA Chart: 18433                           Latitude:   48° 29.1' N (  48.48500)
USGS Quad:  False Bay                       Longitude: 123°  5.0' W (-123.08300)


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


                         BENCH MARK STAMPING:  2 1926
                         DESIGNATION:          944 9856 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:        21710
AGENCY:                  United States Coast & Geodetic
                         Survey                                    IDB PID#:  TR0730
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   48° 29.0' N (  48.48386)          LONGITUDE: 123°  5.0' W (-123.08317)


The benchmark is a disk set in rock outcrop along the shoreline, 9.90 m (32.5
ft) WSW of top of rock outcrop covered in lichen at the edge of vegetation and
0.61 m (2.0 ft) E of the seaward edge of the rock ledge.



                         BENCH MARK STAMPING:  NO 5 1953
                         DESIGNATION:          944 9856 TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:        21711
AGENCY:                  United States Coast & Geodetic
                         Survey                                    IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   48° 29.0' N (  48.48339)          LONGITUDE: 123°  5.0' W (-123.08297)


The benchmark is a disk set in rock outcrop along the shoreline, 50.60 m (166.0
ft) NNW of  the South rock point at approximate high water line, 3.19 m (10.5
ft) WSW of rock face below vegetation and 0.57 m (1.9 ft) ENE of seaward edge of
the rock ledge.

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

                                                                                
Station ID: 9449856                         PUBLICATION DATE:  06/15/2016
Name:       KANAKA BAY, SAN JUAN ISLAND, KANAKA BAY           
            WA
NOAA Chart: 18433                           Latitude:   48° 29.1' N (  48.48500)
USGS Quad:  False Bay                       Longitude: 123°  5.0' W (-123.08300)


                            T I D A L   D A T U M S 


Tidal datums at KANAKA BAY, SAN JUAN ISLAND, KANAKA BAY based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           August 2015 - October 2015
     TIDAL EPOCH:           1983-2001
     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   =  2.232
     MEAN HIGH WATER                            MHW    =  2.056
     MEAN TIDE LEVEL                            MTL    =  1.365
     MEAN SEA LEVEL                             MSL    =  1.338
     MEAN LOW WATER                             MLW    =  0.675
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     1 1926                                      4.138    2.082
     NO. 3 1926                                  4.185    2.129
     4 1944                                      3.434    1.378
     2 1926                                      3.926    1.870
     NO 5 1953                                   4.011    1.955


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

                                                                                
Station ID: 9449856                         PUBLICATION DATE:  06/15/2016
Name:       KANAKA BAY, SAN JUAN ISLAND, KANAKA BAY           
            WA
NOAA Chart: 18433                           Latitude:   48° 29.1' N (  48.48500)
USGS Quad:  False Bay                       Longitude: 123°  5.0' W (-123.08300)


                             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.

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Products available at 9449856 Kanaka Bay, San Juan Island, WA

Revised: 08/08/2018
NOAA / National Ocean Service
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