U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9434068 PUBLICATION DATE: 06/11/2018
Name: CUSHMAN, SIUSLAW RIVER
OR
NOAA Chart: 18583 Latitude: 43° 59.1' N ( 43.98500)
USGS Quad: FLORENCE Longitude: 124° 2.7' W (-124.04500)
To reach the tidal bench marks from the intersection of US Route 101 and State
Highway 126 in Florence, proceed East on State Highway 126 for 2.6 miles (4.2
km) to the Marina on the right at the address of 6516 State Highway Route 126.
The benchmarks are located from the east by Coos Bay Rail Link railroad to the
west side of the marina. The tide gauge is located on the dock on the west side
of the marina.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4068 D 2017
DESIGNATION: 943 4068 D
MONUMENTATION: Flange-encased Rod VM#: 22272
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: OPUS PID#: BBFP77
LATITUDE: 43° 58.9' N ( 43.98136) LONGITUDE: 124° 3.2' W (-124.05369)
The primary bench mark is a flange encased rod set in a gravel pullout 70 m
(229.7 ft) west of the Siuslaw River Marina parking area, 39.91 m (130.9 ft) SSW
of the NW corner of boat dry dock building with white sign reading Siuslaw
Marina RV Park, 35.75 m (117.3 ft) SE of a utility pole numbered 114208, 25.12 m
(82.4 ft) SE of the centerline of highway 126, 19.92 m (65.4 ft) south of a 50
mph speed limit sign and 3.3 m (10.8 ft) NW of the end of the pullout at the
river s edge. The datum point is set 15 cm (6 inches) below ground, being the
top of a stainless steel rod driven 24.38 m (80.0 ft) to refusal, in a sleeve
extending to a depth of 0.9 m (3.0 ft) and encased in a 7-inch National Ocean
Service logo cover with magnets and a concrete kick block.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9434068 PUBLICATION DATE: 06/11/2018
Name: CUSHMAN, SIUSLAW RIVER
OR
NOAA Chart: 18583 Latitude: 43° 59.1' N ( 43.98500)
USGS Quad: FLORENCE Longitude: 124° 2.7' W (-124.04500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4068 B 2017
DESIGNATION: 943 4068 B
MONUMENTATION: Flange-encased Rod VM#: 22273
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: OPUS PID#: BBFP76
LATITUDE: 43° 58.9' N ( 43.98233) LONGITUDE: 124° 3.2' W (-124.05264)
The bench mark is a flange encased rod set at the SW corner of Rose Hill road
and State Highway 126, 29.51 m (96.8 ft) ENE of the SE corner of a metal
building, 12.26 m (40.2 ft) NNE of the southern post of the RV park sign, 8.97 m
(29.4 ft) NW of the center of three mail box support bars, 8.62 m (28.3 ft) west
of a utility pole numbered 114212 and 6.41 m (21.0 ft) west of a 6 by 6 end post
to a fence boarding Rose Hill road. The datum point is set 10 cm (4 inches)
below grade, being the top of a stainless steel rod driven 7.63 m (25.0 ft) to
refusal, in a sleeve extending to a depth of 0.9 ft (27 cm) and encased in a
7-inch National Ocean Service logo cover with magnets and concrete kick block.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9434068 PUBLICATION DATE: 06/11/2018
Name: CUSHMAN, SIUSLAW RIVER
OR
NOAA Chart: 18583 Latitude: 43° 59.1' N ( 43.98500)
USGS Quad: FLORENCE Longitude: 124° 2.7' W (-124.04500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4068 A 2017
DESIGNATION: 943 4068 A
MONUMENTATION: Flange-encased Rod VM#: 22275
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 43° 59.0' N ( 43.98289) LONGITUDE: 124° 3.2' W (-124.05342)
The bench mark is a flange encased rod set in the Siuslaw River RV Park, 60.92 m
(199.9 ft) NNW of the NE corner of a metal building, 8.70 m (28.5 ft) NNE of the
edge of pavement, 5.40 m (17.7 ft) east of the SW corner of a restroom
outbuilding, 3.65 m (12.0 ft) south of a water spigot near stairs leading to
Rose Hill road, and 2.49 m (8.2 ft) SW of the face of the lowest tier of a wood
retaining wall. The datum point is set 4 cm (2 inches) below ground, being the
top of a stainless steel rod driven 5.5 m (18.0 ft) to refusal, in a sleeve
extending to a depth of 0.9 m (3.0 ft) and encased in a 7-inch national ocean
service logo cover with magnets and concrete kick block.
BENCH MARK STAMPING: BM 101.425
DESIGNATION: 101.425
MONUMENTATION: Rivet VM#: 22276
AGENCY: Unknown IDB PID#: OA0393
SETTING CLASSIFICATION: Railroad bridge pier OPUS PID:
LATITUDE: 43° 59.1' N ( 43.98461) LONGITUDE: 124° 2.7' W (-124.04528)
The bench mark is a rivet bolt head set in a railroad bridge pier over the
Siuslaw River, 33.52 m (110.0 ft) SE of the centerline of Highway 126, 2.35 m
(7.7 ft) west of the west rail, 0.70 m (2.3 ft) NNE of the NW corner of the
steel bridge trestle, 0.14 m (0.5 ft) SSW of an eye bolt set in the pier, and
0.08 m (0.3 ft) east of a steel placard reading - BM 101.425.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9434068 PUBLICATION DATE: 06/11/2018
Name: CUSHMAN, SIUSLAW RIVER
OR
NOAA Chart: 18583 Latitude: 43° 59.1' N ( 43.98500)
USGS Quad: FLORENCE Longitude: 124° 2.7' W (-124.04500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PI 885 + 57.14
DESIGNATION: PI 885
MONUMENTATION: Survey disk VM#: 22277
AGENCY: Bureau of Public Roads IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 43° 59.0' N ( 43.98286) LONGITUDE: 124° 3.0' W (-124.04958)
The bench mark is a disk set in a 6-inch concrete monument on the south side of
Highway 126, 47.17 m (154.8 ft) ENE of a utility pole numbered 114215, 45.15 m
(148.1 ft) west of a utility pole numbered 114216, 25.46 m (83.5 ft) ENE of a
road sign with arrow on a metal post, 6.87 m (22.5 ft) SSE of the centerline of
Highway 126, and 0.90 m (3.0 ft) SSE of the guard rail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9434068 PUBLICATION DATE: 06/11/2018
Name: CUSHMAN, SIUSLAW RIVER
OR
NOAA Chart: 18583 Latitude: 43° 59.1' N ( 43.98500)
USGS Quad: FLORENCE Longitude: 124° 2.7' W (-124.04500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: N 117 1941
DESIGNATION: N 117
MONUMENTATION: Bench Mark disk VM#: 22278
AGENCY: US Coast and Geodetic Survey IDB PID#: OA0394
SETTING CLASSIFICATION: Bridge foundation OPUS PID:
LATITUDE: 43° 59.1' N ( 43.98497) LONGITUDE: 124° 2.7' W (-124.04514)
The bench mark is a disk set in the foundation for the rail road bridge over
State Highway 126 in Cushman, 9.82 m (32.2 ft) WSW of the east end of a guard
rail, 9.36 m (30.7 ft) west of a utility pole numbered 114222, 7.73 m (25.4 ft)
NNE of center of wooden piling numbered 756495t, 5.38 m (17.7 ft) SSE of the
center line of highway 126, 3.14 m (10.3 ft) NW of the center of a storm drain
and 0.70 m (2.3 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9434068 PUBLICATION DATE: 06/11/2018
Name: CUSHMAN, SIUSLAW RIVER
OR
NOAA Chart: 18583 Latitude: 43° 59.1' N ( 43.98500)
USGS Quad: FLORENCE Longitude: 124° 2.7' W (-124.04500)
T I D A L D A T U M S
Tidal datums at CUSHMAN, SIUSLAW RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: January 2018 - March 2018
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9432780 CHARLESTON, COOS BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 2.257
MEAN HIGH WATER MHW = 2.057
MEAN SEA LEVEL MSL = 1.201
MEAN TIDE LEVEL MTL = 1.193
MEAN LOW WATER MLW = 0.330
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.103
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4068 D 2017 2.414 0.357
4068 B 2017 3.682 1.625
4068 A 2017 4.919 2.862
BM 101.425 8.481 6.424
PI 885 + 57.14 7.348 5.291
N 117 1941 3.314 1.257
Foot Notes:
Bench mark BM 101.425 is based on one differential leveling connection and do
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9434068 PUBLICATION DATE: 06/11/2018
Name: CUSHMAN, SIUSLAW RIVER
OR
NOAA Chart: 18583 Latitude: 43° 59.1' N ( 43.98500)
USGS Quad: FLORENCE Longitude: 124° 2.7' W (-124.04500)
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.