U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9440079 PUBLICATION DATE: 03/01/2017
Name: BEACON ROCK STATE PARK, COLUMBIA RIVER
WA
NOAA Chart: 18531 Latitude: 45° 37.2' N ( 45.62028)
USGS Quad: MULTNOMAH FALLS Longitude: 122° 1.2' W (-122.02028)
To reach the tide station from the intersection of the west entrance to the
Bridge of the Gods and WA State Highway 14 in Stevenson, proceed SW on State
Highway 14 for 12.2 km (7.6 mi) to Doetsch Ranch Road and access to the Beacon
Rock State Park Boat Launch area on the left, turn left onto Doetsch Ranch Road
and proceed east 1.0 km (0.6 mi) to the boat launch parking lot area. The tide
station is at the west floating dock. The bench marks are located along Doetsch
Ranch Road from the bridge over the railroad tracks to the boat launch.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0079 C 2016
DESIGNATION: 944 0079 C
MONUMENTATION: Bench Mark disk VM#: 22097
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Bridge abutment OPUS PID:
LATITUDE: 45° 37.3' N ( 45.62125) LONGITUDE: 122° 1.4' W (-122.02317)
The primary bench mark is a disk set in the SE corner of a concrete bridge
parapet with metal guardrail at the tee intersection of the old and new boat
ramp access roads, 57.75 m (189.5 ft) NE of the state park sign in the grass on
the NE edge of the boat trailer parking lot along north side of road, 34.83 m
(114.3 ft) ESE of the west end of the river to rock trail footbridge on the
north side of the railroad bridge, 26.63 m (87.4 ft) ESE of the centerline of
the railroad tracks measured from underneath the railroad bridge, 8.86 m (29.1
ft) ENE of the SW bridge abutment, 5.63 m (18.5 ft) SE of the road centerline
and 0.18 m (0.6 ft) above road level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9440079 PUBLICATION DATE: 03/01/2017
Name: BEACON ROCK STATE PARK, COLUMBIA RIVER
WA
NOAA Chart: 18531 Latitude: 45° 37.2' N ( 45.62028)
USGS Quad: MULTNOMAH FALLS Longitude: 122° 1.2' W (-122.02028)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0079 A 2016
DESIGNATION: 944 0079 A
MONUMENTATION: Bench Mark disk VM#: 22098
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete walkway for boat ramp OPUS PID:
LATITUDE: 45° 37.3' N ( 45.62125) LONGITUDE: 122° 1.2' W (-122.02058)
The bench mark is a disk in the elevated concrete walkway to the floating dock
of the Beacon Rock State Park boat ramp, 24.4 m (80.1 ft) NE of the inside
corner of pavement created by the trailer turn around and the handicap trailer
parking spots, 18.25 m (59.9 ft) SE of the SE post of the park ramp fee sign,
6.49 m (21.3 ft) SSW of the north edge of boat ramp concrete, 4.96 m (16.3 ft)
NNW of the south edge of boat ramp concrete and 2.28 m (7.5 ft) ENE of the west
edge of the ramp at pavement.
BENCH MARK STAMPING: 0079 B 2016
DESIGNATION: 944 0079 B
MONUMENTATION: Bench Mark disk VM#: 22099
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete retaining wall OPUS PID:
LATITUDE: 45° 37.3' N ( 45.62186) LONGITUDE: 122° 1.3' W (-122.02158)
The bench mark is a disk set on top of the east end of a concrete retaining wall
cut into the hillside north of the pump shed on the north side of the parking
area, 34.50 m (113.2 ft) west of the wooden walkway out to the floating dock,
17.12 m (56.2 ft) WNW of the west post of the floating dock fee station sign,
10.36 m (34.0 ft) NNE of a green electrical box number 8803 on ground along
north side of driveway, 5.51 m (18.1 ft) NNE of the SW edge of concrete building
pad, 1.76 m (5.8 ft) NNW of the north most corner of the pump shed and 1.52 m
(5.0 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9440079 PUBLICATION DATE: 03/01/2017
Name: BEACON ROCK STATE PARK, COLUMBIA RIVER
WA
NOAA Chart: 18531 Latitude: 45° 37.2' N ( 45.62028)
USGS Quad: MULTNOMAH FALLS Longitude: 122° 1.2' W (-122.02028)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0079 D 2016
DESIGNATION: 944 0079 D
MONUMENTATION: Bench Mark disk VM#: 22100
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete slab OPUS PID:
LATITUDE: 45° 37.2' N ( 45.61975) LONGITUDE: 122° 1.6' W (-122.02706)
The bench mark is a disk set in a concrete pad for a pump station east of the
entrance to the parking lot, 40.05 m (131.4 ft) north of a green electrical box
numbered 25 9176, 18.10 m (59.4 ft) south of the centerline of the road to the
boat launch, 16.85 m (55.3 ft) east of the centerline of the driveway of the
parking lot at the gate, 4.96 m (16.3 ft) NNW of the SW corner of the concrete
pad and 0.32 m (1.0 ft) ESE of the NW corner of the concrete pad.
BENCH MARK STAMPING: 0079 E 2016
DESIGNATION: 944 0079 E
MONUMENTATION: Bench Mark disk VM#: 22101
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Sidewalk OPUS PID#: BBFH22
LATITUDE: 45° 37.2' N ( 45.61931) LONGITUDE: 122° 1.8' W (-122.02979)
The bench mark is a disk set in the sidewalk on the SW abutment of the Doetsch
Ranch road bridge over railroad tracks on the way to the Beacon Rocks State Park
boat ramp, 52.15 m (171.1 ft) SE of the north end of the concrete sidewalk,
30.29 m (99.4 ft) south of the centerline of the railroad tracks measured from
the bridge, 5.82 m (19.1 ft) SW of the road centerline, 5.05 m (16.6 ft) NW of
the SE end of the concrete guardrail, 1.55 m (5.1 ft) SW of the NE edge of
sidewalk along road and 0.12 m (0.4 ft) above road level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9440079 PUBLICATION DATE: 03/01/2017
Name: BEACON ROCK STATE PARK, COLUMBIA RIVER
WA
NOAA Chart: 18531 Latitude: 45° 37.2' N ( 45.62028)
USGS Quad: MULTNOMAH FALLS Longitude: 122° 1.2' W (-122.02028)
T I D A L D A T U M S
Tidal datums at BEACON ROCK STATE PARK, COLUMBIA RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: August 2016 - October 2016
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9439040 ASTORIA, TONGUE POINT, COLUMBIA RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.530
MEAN HIGH WATER MHW = 0.410
MEAN TIDE LEVEL MTL = 0.254
MEAN SEA LEVEL MSL = 0.238
MEAN LOW WATER MLW = 0.098
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0079 C 2016 9.820 9.410
0079 A 2016 5.967 5.557
0079 B 2016 11.614 11.204
0079 D 2016 13.252 12.842
0079 E 2016 24.175 23.765
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9440079 PUBLICATION DATE: 03/01/2017
Name: BEACON ROCK STATE PARK, COLUMBIA RIVER
WA
NOAA Chart: 18531 Latitude: 45° 37.2' N ( 45.62028)
USGS Quad: MULTNOMAH FALLS Longitude: 122° 1.2' W (-122.02028)
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.