U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 9449880 PUBLICATION DATE: 10/30/2003
Name: FRIDAY HARBOR, SAN JUAN CHANNEL
WA
NOAA Chart: 18425 Latitude: 48° 32.8' N ( 48.54670)
USGS Quad: FRIDAY HARBOR Longitude: 123° 0.6' W (-123.01000)
To reach the tidal bench marks from the Friday Harbor Ferry Terminal follow
Spring Street 0.2 km (0.1 mi) and turn right on Second Street, then go 0.6 km
(0.4 mi) and turn right on Tucker Street. Travel 0.5 km (0.3 mi) and turn right
onto the University of Washington Friday Harbor Laboratory grounds, go 1.0 km
(0.6 mi) and turn right into the first parking lot and follow the road along the
water to the small boat pier. The bench marks are located in the vicinity of the
University of Washington Oceanographic Laboratory compound and just inland from
the shore. The tide gauge is located in the compressor shack on the small boat
pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 10 1964
DESIGNATION: 944 9880 TIDAL 10
MONUMENTATION: Topographic Station disk VM#: 1150
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 48° 32.8' N ( 48.54592) LONGITUDE: 123° 0.7' W (-123.01236)
The primary bench mark is a disk set in the first large black 2 m (5 ft) high
rock outcrop on beach and joining the bank at the shoreline, east of the small
boat pier, 44 m (144 ft) east of the centerline of small boat pier, 19 m (62 ft)
SW of the SW corner of Building No. 4, 13 m (44 ft) SSE of the SE corner of
Building No. 2, and 3 m (10 ft) SE of a rock retaining wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 9449880 PUBLICATION DATE: 10/30/2003
Name: FRIDAY HARBOR, SAN JUAN CHANNEL
WA
NOAA Chart: 18425 Latitude: 48° 32.8' N ( 48.54670)
USGS Quad: FRIDAY HARBOR Longitude: 123° 0.6' W (-123.01000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 3 1932
DESIGNATION: BM 3
MONUMENTATION: Tidal Station disk VM#: 1153
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: TR0703
SETTING CLASSIFICATION: Rock outcrop OPUS PID#: TR0703
LATITUDE: 48° 32.8' N ( 48.54642) LONGITUDE: 123° 0.5' W (-123.00908)
The bench mark is a disk set in a rock outcrop, about 110 m (360 ft) west along
a trail from pump house pier, 73 m (240 ft) east of Physics Laboratory Building
No. 6, 11.13 m (36.5 ft) south of the ground-level pipeline, 10 m (34 ft) south
of trail along shore, and 7 m (22 ft) inland from the apparent high water line.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9449880 PUBLICATION DATE: 10/30/2003
Name: FRIDAY HARBOR, SAN JUAN CHANNEL
WA
NOAA Chart: 18425 Latitude: 48° 32.8' N ( 48.54670)
USGS Quad: FRIDAY HARBOR Longitude: 123° 0.6' W (-123.01000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1932
DESIGNATION: BM 4
MONUMENTATION: Tidal Station disk VM#: 1154
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: TR0704
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 48° 32.8' N ( 48.54608) LONGITUDE: 123° 0.6' W (-123.01072)
The bench mark is a disk set in a rock outcrop, 69 m (225 ft) ESE of Building
No. 5, 43 m (140 ft) SW of the SW corner of Physics Laboratory (Building No. 6),
25.15 m (82.5 ft) south of a ground-level pipeline, 18 m (58 ft) north of the
apparent high water line, 10 m (33 ft) NNE of the NE corner of a 2.44 m (8.0 ft)
square concrete footing, and 7.01 m (23.0 ft) south of a trail from the
laboratories to cantilever pier.
BENCH MARK STAMPING: NO 11 1964
DESIGNATION: 944 9880 TIDAL 11
MONUMENTATION: Topographic Station disk VM#: 1158
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Concrete sewer OPUS PID:
LATITUDE: 48° 32.8' N ( 48.54592) LONGITUDE: 123° 0.8' W (-123.01272)
The bench mark is a disk set in top at the NE corner of a 2 m x 2 m (6 x 7 ft)
concrete sewer manhole, 16 m (54 ft) east of the projected centerline of the
small boat pier, 12.04 m (39.5 ft) SE of the SE corner of Building No. 1, 6.71 m
(22.0 ft) SW of the SW corner of Building No. 2, 2.90 m (9.5 ft) east of a fire
hydrant, and 2.44 m (8.0 ft) south of center of road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9449880 PUBLICATION DATE: 10/30/2003
Name: FRIDAY HARBOR, SAN JUAN CHANNEL
WA
NOAA Chart: 18425 Latitude: 48° 32.8' N ( 48.54670)
USGS Quad: FRIDAY HARBOR Longitude: 123° 0.6' W (-123.01000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL 12 1971
DESIGNATION: 944 9880 TIDAL 12
MONUMENTATION: Tidal Station disk VM#: 1159
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 48° 32.8' N ( 48.54592) LONGITUDE: 123° 0.7' W (-123.01200)
The bench mark is a disk set in the second rocky outcrop along the shoreline
east of the pier, about 69 m (225 ft) east of the inshore end of the pier, 23.32
m (76.5 ft) SW of a fire hydrant, 16.92 m (55.5 ft) SE of the SW corner of
Building No. 4, 3.81 m (12.5 ft) SSW of south end of a 0.25 m (0.8 ft) diameter
steel culvert, and 2.44 m (8.0 ft) south of the grade edge.
BENCH MARK STAMPING: 9880 K 1977
DESIGNATION: 944 9880 K
MONUMENTATION: Tidal Station disk VM#: 1160
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 48° 32.8' N ( 48.54636) LONGITUDE: 123° 0.6' W (-123.01050)
The bench mark is a disk set in a rock outcrop, 30 m (100 ft) ENE of bench mark
NO 4 1932, 19.05 m (62.5 ft) ESE of a concrete base supporting a seawater
holding tank, 16.85 m (55.3 ft) east of a brass monument to Christopher G. Reed,
13.72 m (45.0 ft) west of the NW corner of Building # 6 and 4.30 m (14.1 ft) NE
of a small Madrona tree.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9449880 PUBLICATION DATE: 10/30/2003
Name: FRIDAY HARBOR, SAN JUAN CHANNEL
WA
NOAA Chart: 18425 Latitude: 48° 32.8' N ( 48.54670)
USGS Quad: FRIDAY HARBOR Longitude: 123° 0.6' W (-123.01000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9880 A 1984
DESIGNATION: 944 9880 A
MONUMENTATION: Tidal Station disk VM#: 1161
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete step OPUS PID:
LATITUDE: 48° 32.8' N ( 48.54589) LONGITUDE: 123° 0.8' W (-123.01356)
The bench mark is a disk set in the second step from the bottom of a concrete
stairway along the northeastern wall of the stockroom building adjacent to the
main laboratory building, 59.44 m (195.0 ft) NW of bench mark NO 11 1964, 47 m
(155 ft) NW of the foot of the pier, 13.26 m (43.5 ft) north of the
northern-most corner of the main laboratory building, 1.58 m (5.2 ft) NE of the
northeastern wall of the stockroom building, and 0.37 m (1.2 ft) above ground
level.
BENCH MARK STAMPING: 9880 B 1984
DESIGNATION: 944 9880 B
MONUMENTATION: Tidal Station disk VM#: 1162
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete landing OPUS PID:
LATITUDE: 48° 32.7' N ( 48.54542) LONGITUDE: 123° 0.8' W (-123.01367)
The bench mark is a disk set in the second story concrete landing on the SW side
of the main laboratory building, 47.24 m (155.0 ft) SE of the southeastern edge
of the main parking lot on the NW side of the main laboratory building, 8.53 m
(28.0 ft) west of the SW corner of the main laboratory building, 6.00 m (19.7
ft) north of the south corner of the second story concrete landing, and 0.70 m
(2.3 ft) east of a brown metal light pole.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9449880 PUBLICATION DATE: 10/30/2003
Name: FRIDAY HARBOR, SAN JUAN CHANNEL
WA
NOAA Chart: 18425 Latitude: 48° 32.8' N ( 48.54670)
USGS Quad: FRIDAY HARBOR Longitude: 123° 0.6' W (-123.01000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9880 C 1984
DESIGNATION: 944 9880 C
MONUMENTATION: Tidal Station disk VM#: 1163
AGENCY: National Ocean Service (NOS) IDB PID#: AI2205
SETTING CLASSIFICATION: Rock outcrop OPUS PID#: AI2205
LATITUDE: 48° 32.7' N ( 48.54525) LONGITUDE: 123° 0.8' W (-123.01353)
The bench mark is a disk set in a bedrock outcrop high on a rock promontory, 64
m (210 ft) SE of the southeastern edge of the main parking lot on the NW side of
the main laboratory building, 27 m (87 ft) SW of the southern most corner of the
main laboratory building, 22 m (73 ft) north of the seaward edge of the south
facing bluff facing on the rock promontory, and 21.64 m (71.0 ft) SSW of bench
mark 9880 B 1984.
BENCH MARK STAMPING: 9880 D 1984
DESIGNATION: 944 9880 D
MONUMENTATION: Tidal Station disk VM#: 1164
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Boulder OPUS PID:
LATITUDE: 48° 32.7' N ( 48.54500) LONGITUDE: 123° 0.8' W (-123.01414)
The bench mark is a disk set in a 1 m x 1 m (4 ft x 3 ft) prominent boulder, 56
m (184 ft) SW of the southern most corner of the main parking lot on the NW side
of the main laboratory building, 51.82 m (170.0 ft) west of bench mark 9880 C
1984, 13.41 m (44.0 ft) NE of the high water mark along the SW facing shoreline,
and 0.73 m (2.4 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 9449880 PUBLICATION DATE: 10/30/2003
Name: FRIDAY HARBOR, SAN JUAN CHANNEL
WA
NOAA Chart: 18425 Latitude: 48° 32.8' N ( 48.54670)
USGS Quad: FRIDAY HARBOR Longitude: 123° 0.6' W (-123.01000)
T I D A L D A T U M S
Tidal datums at FRIDAY HARBOR, SAN JUAN CHANNEL based on:
LENGTH OF SERIES: 19 YEARS
TIME PERIOD: January 1983 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (12/16/1982) = 3.398
MEAN HIGHER HIGH WATER MHHW = 2.364
MEAN HIGH WATER MHW = 2.167
MEAN TIDE LEVEL MTL = 1.432
MEAN SEA LEVEL MSL = 1.387
MEAN LOW WATER MLW = 0.698
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/07/1947) = -1.265
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 10 1964 3.718 1.551
NO 3 1932 4.479 2.312
NO 4 1932 9.587 7.420
NO 11 1964 6.953 4.787
TIDAL 12 1971 3.251 1.084
9880 K 1977 11.240 9.073
9880 A 1984 7.015 4.849
9880 B 1984 10.092 7.926
9880 C 1984 10.683 8.516
9880 D 1984 7.735 5.568
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 9449880 PUBLICATION DATE: 10/30/2003
Name: FRIDAY HARBOR, SAN JUAN CHANNEL
WA
NOAA Chart: 18425 Latitude: 48° 32.8' N ( 48.54670)
USGS Quad: FRIDAY HARBOR Longitude: 123° 0.6' W (-123.01000)
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.