U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9418778 PUBLICATION DATE: 04/29/2003
Name: BUCKSPORT, HUMBOLDT BAY
CA
NOAA Chart: 18622 Latitude: 40° 46.7' N ( 40.77830)
USGS Quad: EUREKA Longitude: 124° 11.8' W (-124.19700)
To reach the tidal bench marks from the intersection of U.S. Highway 101 and
Truesdale Avenue at the south end of Eureka, proceed west on Truesdale Avenue
for 0.24 km (0.15 mi), then turn right and proceed north on the road that
parallels the railroad tracks on the east for 61 m (200 ft) and turn left and
head west into the Standard Oil distributors yard. The bench marks are along
the railroad tracks and US Highway 101. The tide station was located on the
west side of the Standard Oil loading pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8778 A 1977
DESIGNATION: 941 8778 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 8723
AGENCY: National Ocean Survey (NOS) IDB PID#: LV0647
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 40° 46.6' N ( 40.77670) LONGITUDE: 124° 11.6' W (-124.19300)
The primary bench mark is a disk located near the intersection of Trusdale
Avenue and Howell Street along the eastern rail road tracks, 110.0 m (360.9 ft)
north of the centerline of Trusdale Avenue, 21.6 m (70.9 ft) west of centerline
of Howell Street, 21.49 m (70.5 ft) south of the centerline of the entrance road
to the Standard Oil Bulk Plant, 2.19 m (7.2 ft) west of the west rail of the NW
Pacific railroad, 0.79 m (2.6 ft) east of a utility pole. The bench mark is
cripmed to the top of a copper-coated steel rod driven 9.8 m (32 ft) to refusal,
and encased in PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9418778 PUBLICATION DATE: 04/29/2003
Name: BUCKSPORT, HUMBOLDT BAY
CA
NOAA Chart: 18622 Latitude: 40° 46.7' N ( 40.77830)
USGS Quad: EUREKA Longitude: 124° 11.8' W (-124.19700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8778 B 1977
DESIGNATION: 941 8778 B
MONUMENTATION: Tidal Station disk VM#: 8724
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 40° 46.7' N ( 40.77830) LONGITUDE: 124° 11.7' W (-124.19500)
The bench mark is a disk located near the eastern rail road tracks, 79.55 m
(261.0 ft) north of centerline of Howell Street, 3.14 m (10.3 ft) SSW of a steel
I-beam stake, 2.65 m (8.7 ft) west of the west rail of the tracks, and 0.24 m
(0.8 ft) NE of a telephone pole. The bench mark is set 0.3 m (1 ft) below the
railroad tracks, crimped to the top of a copper-coated steel deep rod, driven an
unspecified depth to refusal, and encased in a white PVC pipe.
BENCH MARK STAMPING: K 75 1931
DESIGNATION: K 75
MONUMENTATION: Bench Mark disk VM#: 8725
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0275
SETTING CLASSIFICATION: Building OPUS PID:
LATITUDE: 40° 46.8' N ( 40.78000) LONGITUDE: 124° 11.2' W (-124.18700)
The bench mark is a disk set vertically in a SE face of a large brick building,
80 m (264 ft) NE of the intersection of US Highway 101 and Harris Street, 21 m
(69 ft) NW of the centerline of NW lanes of the highway, 12.50 m (41.0 ft) NNW
of light pole 3198, 0.61 m (2.0 ft) NE of NE edge of drive through door of
stucco building, and 0.46 m (1.5 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9418778 PUBLICATION DATE: 04/29/2003
Name: BUCKSPORT, HUMBOLDT BAY
CA
NOAA Chart: 18622 Latitude: 40° 46.7' N ( 40.77830)
USGS Quad: EUREKA Longitude: 124° 11.8' W (-124.19700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: RF 1754
DESIGNATION: 941 8778 RF 1754
MONUMENTATION: Survey disk VM#: 8726
AGENCY: Unknown IDB PID#:
SETTING CLASSIFICATION: Building OPUS PID:
LATITUDE: 40° 46.7' N ( 40.77830) LONGITUDE: 124° 11.7' W (-124.19500)
The bench mark is a disk located near the north corner of a building along the
west side of US Highway 101 and NE of the intersection of US Highway 101 and
Harris Street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9418778 PUBLICATION DATE: 04/29/2003
Name: BUCKSPORT, HUMBOLDT BAY
CA
NOAA Chart: 18622 Latitude: 40° 46.7' N ( 40.77830)
USGS Quad: EUREKA Longitude: 124° 11.8' W (-124.19700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: U 1087 1967
DESIGNATION: U 1087
MONUMENTATION: Bench Mark disk VM#: 8727
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0274
SETTING CLASSIFICATION: Concrete head wall OPUS PID:
LATITUDE: 40° 46.5' N ( 40.77500) LONGITUDE: 124° 11.4' W (-124.19000)
The bench mark is a disk set in the top of the south end of the east concrete
headwall of a pipe culvert # 76.03, near the southern city limits of Eureka,
54.86 m (180.0 ft) north of junction of Broadway (U.S. Highway 101) and
Truesdale Avenue, 7.62 m (25.0 ft) east of centerline of east lanes of highway,
0.15 m (0.5 ft) north of south end of concrete headwall of culvert, and 0.3 m (1
ft) below the highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9418778 PUBLICATION DATE: 04/29/2003
Name: BUCKSPORT, HUMBOLDT BAY
CA
NOAA Chart: 18622 Latitude: 40° 46.7' N ( 40.77830)
USGS Quad: EUREKA Longitude: 124° 11.8' W (-124.19700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: V 1087 1967
DESIGNATION: V 1087
MONUMENTATION: Bench Mark disk VM#: 17064
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0276
SETTING CLASSIFICATION: Concrete head wall OPUS PID:
LATITUDE: 40° 47.1' N ( 40.78500) LONGITUDE: 124° 10.9' W (-124.18200)
The bench mark is a disk set in the top of the west concrete head wall of
culvert # 76.86, 16 m (51 ft) SW of the SW corner of the Surf Motel office
building, 9 m (30 ft) south of the centerline of the driveway to the motel, 8 m
(27 ft) north of light pole # 3185, 8 m (27 ft) east of the center ine of the
east lanes of US Highway 101, and 0.3 m (1 ft) south of the north end of the
head wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9418778 PUBLICATION DATE: 04/29/2003
Name: BUCKSPORT, HUMBOLDT BAY
CA
NOAA Chart: 18622 Latitude: 40° 46.7' N ( 40.77830)
USGS Quad: EUREKA Longitude: 124° 11.8' W (-124.19700)
T I D A L D A T U M S
Tidal datums at BUCKSPORT, HUMBOLDT BAY based on:
LENGTH OF SERIES: 12 MONTHS
TIME PERIOD: February 1979 - January 1980
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 (02/17/1980) = 2.740
MEAN HIGHER HIGH WATER MHHW = 2.126
MEAN HIGH WATER MHW = 1.902
MEAN SEA LEVEL MSL = 1.145
MEAN TIDE LEVEL MTL = 1.144
MEAN LOW WATER MLW = 0.385
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (08/08/1979) = -0.646
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8778 A 1977 3.125 1.223
8778 B 1977 2.964 1.062
K 75 1931 5.887 3.985
RF 1754 5.406 3.504
U 1087 1967 6.024 4.122
V 1087 1967 5.076 3.174
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9418778 PUBLICATION DATE: 04/29/2003
Name: BUCKSPORT, HUMBOLDT BAY
CA
NOAA Chart: 18622 Latitude: 40° 46.7' N ( 40.77830)
USGS Quad: EUREKA Longitude: 124° 11.8' W (-124.19700)
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.