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National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9419945 PUBLICATION DATE: 05/23/2013
Name: PYRAMID POINT, SMITH RIVER
CA
NOAA Chart: 18602 Latitude: 41° 56.7' N ( 41.94525)
USGS Quad: SMITH RIVER Longitude: 124° 12.1' W (-124.20092)
To reach the tidal bench marks from the Oregon and California state line,
proceed south on Highway 101 for 6.0 km (3.7 mi) to North Salmon Harbor Road,
then turn right and proceed SW on North Salmon Harbor Road 0.3 km (0.2 mi) to
the Salmon Harbor Resort office. The bench marks are along the beach west from
the Salmon Harbor Resort, and also along the south side of Highway 101 from
Mouth of Smith River Road to the east 1.9 km (1.2 mi). The tide gauges were
located at the base of the stone breakwater with fish cleaning station and the
orifices were located on the rock offshore.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9945 B 2012
DESIGNATION: 941 9945 B
MONUMENTATION: Bench Mark disk VM#: 20615
AGENCY: CO-OPS IDB PID#:
SETTING CLASSIFICATION: OPUS PID#: BBCW76
LATITUDE: 41° 56.8' N ( 41.94736) LONGITUDE: 124° 12.2' W (-124.20378)
THE BENCH MARK IS A DISK SET IN A ROCK OUTCROP ON THE BEACH, 113.7 M (471.5 FT)
WEST OF THE CHAIN LINK GATE AT THE BOTTOM OF THE WOODEN STAIRS LEADING FROM THE
BEACH UP TO A HOUSE, 104.5 M (342.8 FT) EAST OF CONCRETE STAIRS TO THE PARKING
LOT, 14.30 M (46.9 FT) SOUTHEAST OF A PATH THROUGH THE BRUSH TO THE NEAREST
HOUSE, 12.30 M (40.4 FT) SOUTH OF THE VEGETATION LINE AND ABOUT 1.6 M (5.2 FT)
HIGHER THAN THE BEACH.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9419945 PUBLICATION DATE: 05/23/2013
Name: PYRAMID POINT, SMITH RIVER
CA
NOAA Chart: 18602 Latitude: 41° 56.7' N ( 41.94525)
USGS Quad: SMITH RIVER Longitude: 124° 12.1' W (-124.20092)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9945 A 2012
DESIGNATION: 941 9945 A
MONUMENTATION: Bench Mark disk VM#: 20614
AGENCY: CO-OPS IDB PID#:
SETTING CLASSIFICATION: Concrete seawall OPUS PID:
LATITUDE: 41° 56.7' N ( 41.94550) LONGITUDE: 124° 12.0' W (-124.20025)
THE BENCH MARK IS A DISK SET IN THE TOP OF A CONCRETE SEAWALL ALONG THE WEST
SIDE OF A BOAT RAMP, 18.25 M (59.9 FT) SOUTH OF THE SOUTH CORNER OF A SMALL
STORAGE BUILDING, 15.02 M (49.3 FT) NORTHWEST OF THE BOTTOM STEP OF THE CONCRETE
STAIRWAY, 14.92 M (49.0 FT) NORTH OF THE SOUTH END OF THE SEAWALL, 1.04 M (3.4
FT) SOUTH OF A 45 DEGREE BEND IN THE SEAWALL, 3.1 M (10.2 FT) ABOVE THE BEACH
AND 0.44 M (1.4 FT) HIGHER THAN THE BOAT RAMP.
BENCH MARK STAMPING: 9945 C 2012
DESIGNATION: 941 9945 C
MONUMENTATION: Bench Mark disk VM#: 20616
AGENCY: CO-OPS IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 41° 56.7' N ( 41.94553) LONGITUDE: 124° 11.6' W (-124.19364)
THE BENCH MARK IS A DISK SET IN A ROCK OUTCROP NEAR THE SOUTHEAST CORNER OF
LOPEZ STREET AND HIGHWAY 101, 30.50 M (100.1 FT) WEST OF A POWER POLE, 14.82 M
(48.6 FT) SOUTH OF POWER POLE VZ71265 NEAR THE CORNER OF LOPEZ STREET AND
HIGHWAY 101, 5.32 M (17.5 FT) SOUTHWEST OF THE CENTERLINE OF THE PAVED DRIVE
LEADING TO THE FIRST CHANCE LIQUOR STORE, 3.32 M (10.9 FT) NORTHWEST OF THE WEST
SIDE OF A LARGER ROCK OUTCROP, 1.62 M (5.3 FT) WEST OF THE CLOSEST SIDE OF A 1.3
M (4.3 FT) DIAMETER TREE, AND ABOUT 2.6 M (8.5 FT) HIGHER THAN THE PAVED DRIVE.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9419945 PUBLICATION DATE: 05/23/2013
Name: PYRAMID POINT, SMITH RIVER
CA
NOAA Chart: 18602 Latitude: 41° 56.7' N ( 41.94525)
USGS Quad: SMITH RIVER Longitude: 124° 12.1' W (-124.20092)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: C 1399 1988
DESIGNATION: C 1399
MONUMENTATION: Metal Rod VM#: 20617
AGENCY: IDB PID#: LV0545
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 41° 57.1' N ( 41.95136) LONGITUDE: 124° 12.2' W (-124.20336)
THE BENCH MARK IS A FLANGE-ENCASED ROD SET 51.17 M (167.9 FT) SOUTHWEST OF THE
SOUTH SIDE OF HIGHWAY 101, 5.19 M (17.0 FT) NORTH-NORTHWEST OF THE CENTERLINE OF
MOUTH OF SMITH RIVER ROAD, 4.05 M (13.3 FT) NORTHEAST OF A BLUE DEL NORTE COUNTY
D6 SIGN, 1.57 M (5.2 FT) EAST-NORTHEAST OF POWER POLE Z71519, AND 1.27 M (4.2
FT) SOUTHEAST OF A CHAIN LINK FENCE. THE DATUM POINT IS SET 14 CM (6 INCHES)
BELOW GROUND, BEING THE TOP OF A STAINLESS STEEL ROD ENCASED IN A 5-INCH
NATIONAL GEODETIC SURVEY LOGO CAP.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9419945 PUBLICATION DATE: 05/23/2013
Name: PYRAMID POINT, SMITH RIVER
CA
NOAA Chart: 18602 Latitude: 41° 56.7' N ( 41.94525)
USGS Quad: SMITH RIVER Longitude: 124° 12.1' W (-124.20092)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: D 1399 1988
DESIGNATION: D 1399
MONUMENTATION: Metal Rod VM#: 20618
AGENCY: IDB PID#: LV0546
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 41° 56.4' N ( 41.94064) LONGITUDE: 124° 11.1' W (-124.18422)
THE BENCH MARK IS A FLANGE-ENCASED ROD SET 28.22 M (92.6 FT) NORTHWEST OF THE
CENTERLINE OF A GATE TO A FARM ROAD ON THE SOUTH SIDE OF HIGHWAY 101, 10.50 M
(34.4 FT) SOUTHWEST OF THE SOUTH SIDE OF THE EAST BOUND LANE OF HIGHWAY 101,
4.62 M (15.2 FT) SOUTHWEST OF AN ADOPT-A-HIGHWAY SIGN, 1.60 M (5.2 FT) WEST OF
POWER POLE Z71284, 0.90 M (3.0 FT) NORTH-NORTHEAST OF A BARBED WIRE FENCE, AND
0.54 M (1.8 FT) NORTH-NORTHEAST OF AN ORANGE CARSONITE WITNESS POST. THE DATUM
POINT IS SET 1 CM (0 INCH) BELOW GROUND, BEING THE TOP OF A STAINLESS STEEL ROD,
ENCASED IN A 5-INCH NATIONAL GEODETIC SURVEY LOGO CAP.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9419945 PUBLICATION DATE: 05/23/2013
Name: PYRAMID POINT, SMITH RIVER
CA
NOAA Chart: 18602 Latitude: 41° 56.7' N ( 41.94525)
USGS Quad: SMITH RIVER Longitude: 124° 12.1' W (-124.20092)
T I D A L D A T U M S
Tidal datums at PYRAMID POINT, SMITH RIVER based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: November 2012 - February 2013
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:
MEAN HIGHER HIGH WATER MHHW = 1.954
MEAN HIGH WATER MHW = 1.768
MEAN TIDE LEVEL MTL = 1.056
MEAN SEA LEVEL MSL = 1.043
MEAN LOW WATER MLW = 0.343
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.168
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9945 B 2012 3.730 1.962
9945 A 2012 3.583 1.815
9945 C 2012 18.674 16.906
C 1399 1988 24.661 22.893
D 1399 1988 14.344 12.576
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9419945 PUBLICATION DATE: 05/23/2013
Name: PYRAMID POINT, SMITH RIVER
CA
NOAA Chart: 18602 Latitude: 41° 56.7' N ( 41.94525)
USGS Quad: SMITH RIVER Longitude: 124° 12.1' W (-124.20092)
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.