U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9436641 PUBLICATION DATE: 01/24/2018
Name: NESTUCCA BAY, LITTLE NESTUCCA RIVER
OR
NOAA Chart: 18520 Latitude: 45° 9.7' N ( 45.16111)
USGS Quad: NESTUCCA BAY Longitude: 123° 56.3' W (-123.93778)
From the intersection of Oregon highway 6 and US highway 101 in Tillamook,
travel south on us highway 101 for 26.0 mi (41.8 km) to the bridge over the
Little Nestucca River. Parking is available on an access road just west of the
bridge on the north side of the road. The bench marks are located on the bridge,
along us 101, and on Meda Loop Road at a boat launch. The tide gauge is located
at the end of the access road with the sensor being mounted on the south side of
the bridge near the center.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6641 B 2017
DESIGNATION: 943 6641 B
MONUMENTATION: Flange-encased Rod VM#: 22388
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBFR57
LATITUDE: 45° 9.7' N ( 45.16086) LONGITUDE: 123° 56.4' W (-123.94036)
The primary bench mark is a flange encased rod set NW of a gravel access road on
the west side of the bridge over the little Nestucca River, 23.47 m (77.0 ft)
NNW of the edge of pavement of US 101, 11.79 m (38.7 ft) west of a white sign
reading S.H.R.W, 10.08 m (33.1 ft) NW of a utility pole numbered 053203, 2.59 m
(8.5 ft) ENE of the center pole of three support fence posts, and 0.40 m (1.3
ft) SSE of a witness post. The datum point is set 5 cm (2 inches) below grade,
being the top of a stainless steel rod driven 12.8 m (42.0 ft) to refusal, in a
sleeve extending to a depth of 0.9 m (3.0 ft) and encased in a PVC pipe with
kick block containing magnetic material and NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9436641 PUBLICATION DATE: 01/24/2018
Name: NESTUCCA BAY, LITTLE NESTUCCA RIVER
OR
NOAA Chart: 18520 Latitude: 45° 9.7' N ( 45.16111)
USGS Quad: NESTUCCA BAY Longitude: 123° 56.3' W (-123.93778)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6641 A 2017
DESIGNATION: 943 6641 A
MONUMENTATION: Bench Mark disk VM#: 22389
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete steps OPUS PID:
LATITUDE: 45° 9.5' N ( 45.15914) LONGITUDE: 123° 56.1' W (-123.93494)
The bench mark is a disk set in the steps leading up to the restroom building
near the SE end of the boat launch parking area, 49.29 m (161.7 ft) SE of a
yellow painted fee pay box near the boat launch ramp, 30.09 m (98.7 ft) SW of a
large birch tree south of the boat launch ramp, 13.05 m (42.8 ft) SW of the NW
corner of the sidewalk, and 2.56 m (8.4 ft) west of the NW corner of the
restroom building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9436641 PUBLICATION DATE: 01/24/2018
Name: NESTUCCA BAY, LITTLE NESTUCCA RIVER
OR
NOAA Chart: 18520 Latitude: 45° 9.7' N ( 45.16111)
USGS Quad: NESTUCCA BAY Longitude: 123° 56.3' W (-123.93778)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: C 713 1987
DESIGNATION: C 713
MONUMENTATION: Vertical Control disk VM#: 22391
AGENCY: NGS IDB PID#:
SETTING CLASSIFICATION: Bridge abutment OPUS PID:
LATITUDE: 45° 9.7' N ( 45.16106) LONGITUDE: 123° 56.3' W (-123.93864)
The bench mark is a disk set vertically on the north side of the west abutment
for the US 101 bridge over the little Nestucca River, 27.20 m (89.2 ft) WSW of
the bridge pier located in the river, 15.19 m (49.8 ft) SE of a utility pole
numbered 053201, 9.25 m (30.3 ft) SSE of the edge of pavement of the access
road, 1.82 m (6.0 ft) NNE of the west face of a the vertical wing wall in the
bridge, 0.90 m (3.0 ft) ENE of a bolt in the bridge abutment, 1.73 m (5.7 ft)
below the level of bridge deck and 0.43 above the surrounding grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9436641 PUBLICATION DATE: 01/24/2018
Name: NESTUCCA BAY, LITTLE NESTUCCA RIVER
OR
NOAA Chart: 18520 Latitude: 45° 9.7' N ( 45.16111)
USGS Quad: NESTUCCA BAY Longitude: 123° 56.3' W (-123.93778)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: B 713 1987
DESIGNATION: B 713
MONUMENTATION: Vertical Control disk VM#: 22393
AGENCY: NGS IDB PID#:
SETTING CLASSIFICATION: Retaining wall OPUS PID:
LATITUDE: 45° 9.7' N ( 45.16156) LONGITUDE: 123° 56.2' W (-123.93639)
The bench mark is a disk set in the retaining wall near the NE end of the US 101
bridge over the little Nestucca River, 23.88 m (78.3 ft) sloped distance SSE of
an 8 inch wooden post at the west end of a field access gate, 22.93 m (75.2 ft)
WSW of the beginning of the southbound traffic guard rail, 21.08 m (69.2 ft) SW
of a utility pole numbered 054202, and 6.35 m (20.8 ft) NNW of the centerline of
US 101.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9436641 PUBLICATION DATE: 01/24/2018
Name: NESTUCCA BAY, LITTLE NESTUCCA RIVER
OR
NOAA Chart: 18520 Latitude: 45° 9.7' N ( 45.16111)
USGS Quad: NESTUCCA BAY Longitude: 123° 56.3' W (-123.93778)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Q 690 1982
DESIGNATION: Q 690
MONUMENTATION: Bench Mark disk VM#: 22395
AGENCY: Oregon Department of Transportation IDB PID#:
SETTING CLASSIFICATION: End of parapit wall OPUS PID:
LATITUDE: 45° 9.7' N ( 45.16147) LONGITUDE: 123° 56.2' W (-123.93622)
The bench mark is a disk set in the east end of a bridge parapit wall on the SE
end of the US 101 bridge over the little Nestucca River, 23.60 m (77.4 ft) south
of a utility pole numbered 054202, 21.67 m (71.1 ft) WSW of the east end of a
guard rail, 19.27 m (63.2 ft) WSW of a divided traffic sign, 6.58 m (21.6 ft)
SSE of the centerline of US 101, 1.27 m (4.2 ft) WSW of the east end of the
parapit top, and 1.05 m (3.4 ft) above the grade of the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9436641 PUBLICATION DATE: 01/24/2018
Name: NESTUCCA BAY, LITTLE NESTUCCA RIVER
OR
NOAA Chart: 18520 Latitude: 45° 9.7' N ( 45.16111)
USGS Quad: NESTUCCA BAY Longitude: 123° 56.3' W (-123.93778)
T I D A L D A T U M S
Tidal datums at NESTUCCA BAY, LITTLE NESTUCCA RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: July 2017 - September 2017
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9435380 SOUTH BEACH, YAQUINA RIVER
Elevations of tidal datums referred to Mean High Water (MHW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.213
MEAN HIGH WATER MHW = 0.000
North American Vertical Datum NAVD88 = -2.067
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MHW
6641 B 2017 0.019
6641 A 2017 0.236
C 713 1987 2.597
B 713 1987 4.602
Q 690 1982 5.520
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9436641 PUBLICATION DATE: 01/24/2018
Name: NESTUCCA BAY, LITTLE NESTUCCA RIVER
OR
NOAA Chart: 18520 Latitude: 45° 9.7' N ( 45.16111)
USGS Quad: NESTUCCA BAY Longitude: 123° 56.3' W (-123.93778)
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.