Bench Mark Sheet for 9447110, LOCKHEED SHIPYARD 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 9447110                         PUBLICATION DATE:  06/13/2003
Name:       LOCKHEED SHIPYARD                                 
            WA
NOAA Chart: 18450                           Latitude:   47° 35.1' N (  47.58500)
USGS Quad:  SEATTLE SOUTH                   Longitude: 122° 21.7' W (-122.36200)


To reach the bench marks from U.S. Highway 5 in Seattle, proceed west on South
Spokane Street for 2.5 km (1.6 mi) to Harbor Island and the West Waterway.  The
bench marks are along the shore of the West Waterway along 26th Avenue SW and on
the west side of Harbor Island.  The tide station was on Harbor Island near the
foot of SW Lander Street.


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


                 PRIMARY BENCH MARK STAMPING:  TIDAL 7110 B 1978
                         DESIGNATION:          944 7110 B

MONUMENTATION:           Tidal Station disk                    VM#:        14838
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified rod                       OPUS PID:        
LATITUDE:   47° 35.1' N (  47.58500)          LONGITUDE: 122° 21.6' W (-122.36000)


The primary bench mark is a disk located 116 m (382 ft) south of bench mark
TIDAL BM 7 1975, 19 m (61 ft) west of the centerline of 26th Avenue SW, 10 m (33
ft) east of the west wall of the Olympic S.W. Company Salmon Terminals at 2645
26th Avenue SW, and 0.61 m (2.0 ft) SW of a standard witness post.  The bench
mark is crimped to the top of an unspecified rod driven to a depth of 19.5 m (64
ft), and surrounded by a 4-inch PVC pipe extending 0.15 m (0.5 ft) above the
disk.

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

                                                                                
Station ID: 9447110                         PUBLICATION DATE:  06/13/2003
Name:       LOCKHEED SHIPYARD                                 
            WA
NOAA Chart: 18450                           Latitude:   47° 35.1' N (  47.58500)
USGS Quad:  SEATTLE SOUTH                   Longitude: 122° 21.7' W (-122.36200)


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


                         BENCH MARK STAMPING:  TIDAL BM 6 1975
                         DESIGNATION:          944 7110 TIDAL 6

MONUMENTATION:           Tidal Station disk                    VM#:        14833
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  SY0273
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID:        
LATITUDE:   47° 35.0' N (  47.58330)          LONGITUDE: 122° 21.8' W (-122.36300)


The bench mark is a disk set flush in the NE corner of a 1 m x 1 m (3 ft x 3 ft)
concrete footing for a sawdust hopper, located within Lockheed Plant # 2 at the
north end of 26th Avenue SW, 16 m (51 ft) west of the extended east wall of
Building # 208, 8.69 m (28.5 ft) east of the extended centerline of Pier 23, 5 m
(16 ft) north of Building No. 208, and 0.12 m (0.4 ft) above pavement.



                         BENCH MARK STAMPING:  TIDAL BM 7 1975
                         DESIGNATION:          944 7110 TIDAL 7

MONUMENTATION:           Tidal Station disk                    VM#:        14834
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  SY0271
SETTING CLASSIFICATION:  Building                              OPUS PID:        
LATITUDE:   47° 34.7' N (  47.57830)          LONGITUDE: 122° 21.8' W (-122.36300)


The bench mark is a disk set vertically at the NE corner of the Olympic S. S.
CO. Salmon Terminals at 2645 26th Avenue, 0.24 km (0.15 mi) south of the
entrance gate to Lockheed Plant # 2, 69 m (225 ft) south of the SE corner of the
SeaLand Company building, 29 m (95 ft) east of the centerline of 26th Avenue SW,
and 0.76 m (2.5 ft) above ground.

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

                                                                                
Station ID: 9447110                         PUBLICATION DATE:  06/13/2003
Name:       LOCKHEED SHIPYARD                                 
            WA
NOAA Chart: 18450                           Latitude:   47° 35.1' N (  47.58500)
USGS Quad:  SEATTLE SOUTH                   Longitude: 122° 21.7' W (-122.36200)


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


                         BENCH MARK STAMPING:  TIDAL BM 8 1975
                         DESIGNATION:          944 7110 TIDAL 8

MONUMENTATION:           Tidal Station disk                    VM#:        14835
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  SY0270
SETTING CLASSIFICATION:  Building                              OPUS PID:        
LATITUDE:   47° 34.5' N (  47.57500)          LONGITUDE: 122° 21.8' W (-122.36300)


The bench mark is a disk set flush at the base of the easternmost window in the
north wall of SeaLand's main office building at 2805 26th Avenue SW, 0.48 km
(0.3 mi) south of the entrance gate of Lockheed Plant # 2, 56.54 m (185.5 ft)
south of the SE corner of Olympic S.S. Company Salmon Terminals, 37.64 m (123.5
ft) west of the centerline of 26th Avenue SW, 3 m (9 ft) west of the NE corner,
and 0.61 m (2 ft) above ground.



                         BENCH MARK STAMPING:  TIDAL BM 9 1975
                         DESIGNATION:          944 7110 TIDAL 9

MONUMENTATION:           Tidal Station disk                    VM#:        14836
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  SY0272
SETTING CLASSIFICATION:  Building                              OPUS PID:        
LATITUDE:   47° 34.9' N (  47.58170)          LONGITUDE: 122° 21.8' W (-122.36300)


The bench mark is a disk set vertically in the west wall at the NW corner of the
KJR Radio Station building at 2600 26th Avenue SW, 97 m (317 ft) south of the
entrance to Lockheed Plant # 2, 17 m (56 ft) east of the centerline of 26th
Avenue SW, and 0.3 m (1 ft) above ground.

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

                                                                                
Station ID: 9447110                         PUBLICATION DATE:  06/13/2003
Name:       LOCKHEED SHIPYARD                                 
            WA
NOAA Chart: 18450                           Latitude:   47° 35.1' N (  47.58500)
USGS Quad:  SEATTLE SOUTH                   Longitude: 122° 21.7' W (-122.36200)


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


                         BENCH MARK STAMPING:  TIDAL 7110 A 1978
                         DESIGNATION:          944 7110 A

MONUMENTATION:           Tidal Station disk                    VM#:        14837
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified rod                       OPUS PID:        
LATITUDE:   47° 35.1' N (  47.58500)          LONGITUDE: 122° 21.6' W (-122.36000)


The bench mark is a disk located 74 m (244 ft) south of the SE corner of the
main SeaLand office at 2805 26th Avenue SW, 29 m (96 ft) west of the centerline
of 26th Avenue SW, 20 m (66 ft) east of the cyclone fence surrounding the
SeaLand Container Lot, 12 m (38 ft) west of the westernmost rail of a railroad
track running parallel to and the length of 26th Avenue SW, and 0.61 m (2.0 ft)
west of a standard witness post.  The bench mark is crimped to the top of an
unspecified rod driven to an unspecified depth to refusal, and surrounded by a
4-inch PVC pipe extending 8 cm (0.3 ft) above the disk.

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

                                                                                
Station ID: 9447110                         PUBLICATION DATE:  06/13/2003
Name:       LOCKHEED SHIPYARD                                 
            WA
NOAA Chart: 18450                           Latitude:   47° 35.1' N (  47.58500)
USGS Quad:  SEATTLE SOUTH                   Longitude: 122° 21.7' W (-122.36200)


                            T I D A L   D A T U M S 


Tidal datums at LOCKHEED SHIPYARD based on:

     LENGTH OF SERIES:      3 YEARS
     TIME PERIOD:           January 1978 - December 1980
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9447130 SEATTLE, PUGET SOUND


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

     HIGHEST OBSERVED WATER LEVEL (12/15/1977)         =  4.250
     MEAN HIGHER HIGH WATER                     MHHW   =  3.470
     MEAN HIGH WATER                            MHW    =  3.206
     MEAN TIDE LEVEL                            MTL    =  2.037
     MEAN SEA LEVEL                             MSL    =  2.028
     MEAN LOW WATER                             MLW    =  0.867
     North American Vertical Datum              NAVD88 =  0.727
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (12/30/1978)         = -1.276

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     TIDAL 7110 B 1978                           5.236    2.030
     TIDAL BM 6 1975                             5.079    1.873
     TIDAL BM 7 1975                             6.396    3.190
     TIDAL BM 8 1975                             5.697    2.491
     TIDAL BM 9 1975                             5.750    2.544
     TIDAL 7110 A 1978                           5.220    2.014


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

                                                                                
Station ID: 9447110                         PUBLICATION DATE:  06/13/2003
Name:       LOCKHEED SHIPYARD                                 
            WA
NOAA Chart: 18450                           Latitude:   47° 35.1' N (  47.58500)
USGS Quad:  SEATTLE SOUTH                   Longitude: 122° 21.7' W (-122.36200)


                             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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