U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9435992 PUBLICATION DATE: 01/04/2018
Name: CHINOOK BEND, SILETZ RIVER
OR
NOAA Chart: 18003 Latitude: 44° 52.8' N ( 44.88000)
USGS Quad: DEVILS LAKE Longitude: 123° 57.8' W (-123.96361)
To reach the bench marks from the intersection of US Highway 101 and State
Highway 229 (Siletz Highway) in Kernville just north of the Hwy 101 bridge over
the Siletz River, travel east on State Highway 229 for 4.9 km (3.0 mi) to the
driveway to the Chinook Bend Resort and Marina on the right, turn right and
proceed south for 0.8 km (0.5 mi) to the floating docks. The bench marks are
located on the Marina property near the river. The tide gauge is located on a
single piling supporting one of the floating docks.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5992 B 2017
DESIGNATION: 943 5992 B
MONUMENTATION: Flange-encased Rod VM#: 22419
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 44° 52.8' N ( 44.87942) LONGITUDE: 123° 57.7' W (-123.96183)
The primary bench mark is a flange incased rod set on the south side of the
Chinook Bend RV resort, 53.24 m (174.7 ft) SE of a utility pole, 36.31 m (119.1
ft) NE of edge of gravel road, 32.41 m (106.3 ft) ESE of a sump well in the
field, and 0.85 m (2.8 ft) SW of a witness post. The datum point is set 10 cm (4
inches) below grade, being the top of a stainless steel rod driven 28.0 m (92.0
ft) to substantial resistance, 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 6
Station ID: 9435992 PUBLICATION DATE: 01/04/2018
Name: CHINOOK BEND, SILETZ RIVER
OR
NOAA Chart: 18003 Latitude: 44° 52.8' N ( 44.88000)
USGS Quad: DEVILS LAKE Longitude: 123° 57.8' W (-123.96361)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5992 A 2017
DESIGNATION: 943 5992 A
MONUMENTATION: Flange-encased Rod VM#: 22420
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 44° 52.7' N ( 44.87875) LONGITUDE: 123° 57.7' W (-123.96106)
The bench mark is a flange incased rod set on the SE side of the Chinook Bend RV
resort, 34.21 m (112.2 ft) SSE of 8 inch x 8 inch gate post, 30.11 m (98.8 ft)
north of tree at edge of river, and 0.37 m (1.2 ft) south of a witness post. The
datum point is set 12 cm (5 inches) below grade, being the top of a stainless
steel rod driven 25.6 m (84.0 ft) to substantial resistance, 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.
BENCH MARK STAMPING: 5992 C 2017
DESIGNATION: 943 5992 C
MONUMENTATION: Bench Mark disk VM#: 22421
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Bathroom foundation OPUS PID:
LATITUDE: 44° 52.8' N ( 44.88042) LONGITUDE: 123° 57.8' W (-123.96358)
The bench mark is a disk set in the concrete foundation of an outbuilding
serving as a shower house, 12.52 m (41.1 ft) SE of south end of a roll up door
on the maintenance building to the north, 3.80 m (12.5 ft) SE of a utility pole,
2.26 m (7.4 ft) south of the NE corner of the pad, 1.46 m (4.8 ft) east of the
NE corner of outhouse building and 0.6 m (2.0 ft) above the level of the
surrounding grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9435992 PUBLICATION DATE: 01/04/2018
Name: CHINOOK BEND, SILETZ RIVER
OR
NOAA Chart: 18003 Latitude: 44° 52.8' N ( 44.88000)
USGS Quad: DEVILS LAKE Longitude: 123° 57.8' W (-123.96361)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5992 D 2017
DESIGNATION: 943 5992 D
MONUMENTATION: Flange-encased Rod VM#: 22422
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 44° 52.9' N ( 44.88108) LONGITUDE: 123° 57.8' W (-123.96283)
The bench mark is a flange encased rod set near the east pit of a horseshoe
court in the Chinook Bend RV resort, 30.43 m (99.8 ft) east of northern most
corner of red mansard roof shed, 22.14 m (72.6 ft) WNW of the high point of a
six foot boulder, 4.01 m (13.2 ft) north of edge of a gravel road, and 1.64 m
(5.4 ft) east of the NW corner of the east horseshoe pit. The datum point is set
10 cm (4 inches) below grade, being the top of a stainless steel rod driven 23.8
m (78.0 ft) to substantial resistance, 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 4 of 6
Station ID: 9435992 PUBLICATION DATE: 01/04/2018
Name: CHINOOK BEND, SILETZ RIVER
OR
NOAA Chart: 18003 Latitude: 44° 52.8' N ( 44.88000)
USGS Quad: DEVILS LAKE Longitude: 123° 57.8' W (-123.96361)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5992 E 2017
DESIGNATION: 943 5992 E
MONUMENTATION: Flange-encased Rod VM#: 22423
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBFR64
LATITUDE: 44° 52.9' N ( 44.88167) LONGITUDE: 123° 57.7' W (-123.96200)
The bench mark is a flange encased rod set on the north of the Chinook Bend RV
resort at the intersection between the main driveway leading from the highway to
the river and a two track road leading east into a field, 19.79 m (64.9 ft)
north of a culvert invert, 7.31 m (24.0 ft) east of edge of road leading to
highway, 1.85 m (6.1 ft) NW of post holding gate, and 1.80 m (5.9 ft) east of a
witness post. The datum point is set 6 cm (2 inches) below grade, being the top
of a stainless steel rod driven 24.4 m (80.0 ft) to substantial resistance, 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 5 of 6
Station ID: 9435992 PUBLICATION DATE: 01/04/2018
Name: CHINOOK BEND, SILETZ RIVER
OR
NOAA Chart: 18003 Latitude: 44° 52.8' N ( 44.88000)
USGS Quad: DEVILS LAKE Longitude: 123° 57.8' W (-123.96361)
T I D A L D A T U M S
Tidal datums at CHINOOK BEND, SILETZ 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 Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.683
MEAN HIGH WATER MHW = 1.473
MEAN TIDE LEVEL MTL = 0.831
MEAN SEA LEVEL MSL = 0.821
MEAN LOW WATER MLW = 0.189
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5992 B 2017 1.806 0.333
5992 A 2017 2.942 1.469
5992 C 2017 3.416 1.943
5992 D 2017 2.356 0.883
5992 E 2017 1.988 0.515
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9435992 PUBLICATION DATE: 01/04/2018
Name: CHINOOK BEND, SILETZ RIVER
OR
NOAA Chart: 18003 Latitude: 44° 52.8' N ( 44.88000)
USGS Quad: DEVILS LAKE Longitude: 123° 57.8' W (-123.96361)
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.