U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 8
Station ID: 9419059 PUBLICATION DATE: 05/15/2003
Name: TRINIDAD HARBOR
CA
NOAA Chart: 18605 Latitude: 41° 3.4' N ( 41.05670)
USGS Quad: TRINIDAD Longitude: 124° 8.8' W (-124.14700)
To reach the tidal bench marks from U.S. Highway 101 take the Trinidad exit
(Main Street) west, proceed to Trinity Street and turn south, continue to
Edwards Street and turn west, follow Edwards Street as it turns into Bay Street,
then south along Bay Street until it dead ends at the Hallmark Pier. The bench
marks are in the vicinity of Bobs boat basin.The tide station is located in the
Humboldt State University pump house at the end of the pier at Bobs boat basin
and the bench marks are in the vicinity of the basin.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: TIDAL 4 1972
DESIGNATION: 941 9059 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 8756
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0601
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 41° 3.4' N ( 41.05670) LONGITUDE: 124° 8.9' W (-124.14800)
The primary bench mark is a disk set in a large area of outcropping bedrock at
the west base of Little Head, 20.09 m (65.9 ft) south of the north end of
Hallmark pier, 17.40 m (57.1 ft) NW of bench mark 2 1929, 9.39 m (30.8 ft) east
of the center of the pier, and 3.0 m (9.8 ft) below the pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 9419059 PUBLICATION DATE: 05/15/2003
Name: TRINIDAD HARBOR
CA
NOAA Chart: 18605 Latitude: 41° 3.4' N ( 41.05670)
USGS Quad: TRINIDAD Longitude: 124° 8.8' W (-124.14700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1 1929
DESIGNATION: 941 9059 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 8754
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0600
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 41° 3.4' N ( 41.05670) LONGITUDE: 124° 8.9' W (-124.14800)
The bench mark is a disk set in a 3 m X 3 m (10 ft X 10 ft) area of an
outcropping bedrock, 30.39 m (99.7 ft) south of the north end of the Hallmark
pier, 9.11 m (29.9 ft) west of the center of the pier and 3.5 m (11.5 ft) above
the low water line.
BENCH MARK STAMPING: 2 1929
DESIGNATION: 941 9059 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 8755
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0602
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 41° 3.4' N ( 41.05670) LONGITUDE: 124° 8.9' W (-124.14800)
The bench mark is a disk set vertically in the west face of a large area of
outcropping bedrock at the wet base of Little Head, 36.60 m (120.1 ft) south of
the north end of Hallmark pier, 17.40 m (57.1 ft) SW of bench mark TIDAL 4 1972,
14.60 m (47.9 ft) east of the center of the pier, and 1.0 m (3.3 ft) below the
pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9419059 PUBLICATION DATE: 05/15/2003
Name: TRINIDAD HARBOR
CA
NOAA Chart: 18605 Latitude: 41° 3.4' N ( 41.05670)
USGS Quad: TRINIDAD Longitude: 124° 8.8' W (-124.14700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL 5 1972
DESIGNATION: 941 9059 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 8757
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0598
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 41° 3.4' N ( 41.05670) LONGITUDE: 124° 8.9' W (-124.14800)
The bench mark is a disk set in a bedrock outcrop at the base of a cliff that
runs along the east side of Trinidad Head, 118.90 m (390.1 ft) west of the NW
corner of Hallmark pier, 13.68 m (44.9 ft) south of the base of a grass covered
bluff and 1.5 m (4.9 ft) above the ground.
BENCH MARK STAMPING: TIDAL 6 1972
DESIGNATION: 941 9059 TIDAL 6
MONUMENTATION: Tidal Station disk VM#: 8758
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0599
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 41° 3.4' N ( 41.05670) LONGITUDE: 124° 8.9' W (-124.14800)
The bench mark is a disk set in a bedrock outcrop at the base of a cliff that
runs along the east side of Trinidad Head, 118.90 m (390.1ft) west of the NW end
of Hallmark pier, 36.61 m (120.1 ft) south of the base of a grass covered bluff,
and 1.5 m (4.9 ft) above the apparent low water line.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9419059 PUBLICATION DATE: 05/15/2003
Name: TRINIDAD HARBOR
CA
NOAA Chart: 18605 Latitude: 41° 3.4' N ( 41.05670)
USGS Quad: TRINIDAD Longitude: 124° 8.8' W (-124.14700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9059 H 1977
DESIGNATION: 941 9059 H
MONUMENTATION: Tidal Station disk VM#: 8760
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 41° 3.4' N ( 41.05670) LONGITUDE: 124° 8.8' W (-124.14700)
The bench mark is a disk set 70 m (230 ft) NW of the base of Trinidad Head, 60 m
(198 ft) SW of the centerline of Asphalt Road at a sharp curve in road where Van
Wycke Street becomes Bay Street, 21 m (69 ft) SE of storm high water line of
College Beach Cove, 2 m (6 ft) NW of a wooden "No Overnight Parking" sign, 0.46
m (1.5 ft) NW of a metal witness post. The bench mark is crimped to the top of
a copper-clad steel rod, driven 18.3 m (60 ft), and encased in a 4-inch PVC
pipe.
BENCH MARK STAMPING: 9059 J 1977
DESIGNATION: 941 9059 J TIDAL
MONUMENTATION: Tidal Station disk VM#: 8761
AGENCY: National Ocean Survey (NOS) IDB PID#: LV0597
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 41° 3.5' N ( 41.05830) LONGITUDE: 124° 8.9' W (-124.14800)
The bench mark is a disk set in a 3 m X 5 m (10 ft X 15 ft) area of outcropping
bedrock, 10 m (33 ft) east of the apparent high water line, 2 m (7 ft) west of
the base of a grass covered bank, and 1.49 m (4.9 ft) above the beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9419059 PUBLICATION DATE: 05/15/2003
Name: TRINIDAD HARBOR
CA
NOAA Chart: 18605 Latitude: 41° 3.4' N ( 41.05670)
USGS Quad: TRINIDAD Longitude: 124° 8.8' W (-124.14700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9059 K 1979
DESIGNATION: 941 9059 K 1979
MONUMENTATION: Tidal Station disk VM#: 8762
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 41° 3.4' N ( 41.05670) LONGITUDE: 124° 8.8' W (-124.14700)
The bench mark is a disk set on a rock outcropping, 57.70 m (189.3 ft) east of
NE corner of Seascape Resturant, 3.02 m (9.9 ft) south of the northernmost rail
of boat launch, and 2.71 m (8.9 ft) SE of the most inshore 2 m X 3 m (5 ft X 10
ft) concrete support for the boat launch rails.
BENCH MARK STAMPING: 9059 L 1979
DESIGNATION: 941 9059 L TIDAL
MONUMENTATION: Tidal Station disk VM#: 8763
AGENCY: National Ocean Survey (NOS) IDB PID#: LV0604
SETTING CLASSIFICATION: Rock outcrop OPUS PID#: LV0604
LATITUDE: 41° 3.4' N ( 41.05670) LONGITUDE: 124° 8.8' W (-124.14700)
The bench mark is a disk set in a 1 m X 1 m (3 ft X 4 ft) white and red quartz
rock outcrop along the base of a bluff overlooking the beach, 118.81 m (389.8
ft) NE of the north end of Hallmark pier, 46.30 m (151.9 ft) east of the center
of the street, 2.01 m (6.6 ft) NW of the apparent high water line, and 0.2 m
(0.06 ft) above the beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9419059 PUBLICATION DATE: 05/15/2003
Name: TRINIDAD HARBOR
CA
NOAA Chart: 18605 Latitude: 41° 3.4' N ( 41.05670)
USGS Quad: TRINIDAD Longitude: 124° 8.8' W (-124.14700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9059 M 1981
DESIGNATION: 941 9059 M TIDAL
MONUMENTATION: Tidal Station disk VM#: 8764
AGENCY: National Ocean Survey (NOS) IDB PID#: LV0603
SETTING CLASSIFICATION: Foundation OPUS PID:
LATITUDE: 41° 3.4' N ( 41.05670) LONGITUDE: 124° 8.9' W (-124.14800)
The bench mark is a disk set in the concrete base of a lift used to launch and
haul out boats, 27.98 m (91.8 ft) north of the NW corner of the Hallmark Pier,
18.26 m (59.9 ft) east of the SE corner of the Seascape Restaurant, 2.19 m (7.2
ft) south of the southernmost of two metal tracks of a railway system used for
launching, and 0.91 m (3.0 ft) west of the south leg of the lift.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 9419059 PUBLICATION DATE: 05/15/2003
Name: TRINIDAD HARBOR
CA
NOAA Chart: 18605 Latitude: 41° 3.4' N ( 41.05670)
USGS Quad: TRINIDAD Longitude: 124° 8.8' W (-124.14700)
T I D A L D A T U M S
Tidal datums at TRINIDAD HARBOR based on:
LENGTH OF SERIES: 4 Years
TIME PERIOD: September 1983 - August 1987
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9419750 CRESCENT CITY, PACIFIC OCEAN
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (01/26/1983) = 3.168
MEAN HIGHER HIGH WATER MHHW = 2.051
MEAN HIGH WATER MHW = 1.844
MEAN TIDE LEVEL MTL = 1.107
MEAN SEA LEVEL MSL = 1.100
MEAN LOW WATER MLW = 0.371
North American Vertical Datum NAVD88 = 0.077
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/30/1974) = -0.813
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
TIDAL 4 1972 2.816 0.972
1 1929 4.745 2.901
2 1929 3.824 1.980
TIDAL 5 1972 4.136 2.292
TIDAL 6 1972 2.444 0.600
9059 H 1977 8.125 6.281
9059 J 1977 6.854 5.010
9059 K 1979 4.104 2.260
9059 L 1979 3.700 1.856
9059 M 1981 7.008 5.164
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 9419059 PUBLICATION DATE: 05/15/2003
Name: TRINIDAD HARBOR
CA
NOAA Chart: 18605 Latitude: 41° 3.4' N ( 41.05670)
USGS Quad: TRINIDAD Longitude: 124° 8.8' W (-124.14700)
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.