U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9440047 PUBLICATION DATE: 04/04/2017
Name: WASHOUGAL, COLUMBIA RIVER
WA
NOAA Chart: 18531 Latitude: 45° 34.7' N ( 45.57830)
USGS Quad: CAMAS Longitude: 122° 22.9' W (-122.38200)
To reach the station from the north end of the I-205 Glenn L. Jackson Memorial
Bridge over the Columbia River, proceed north 0.5 km (0.3 mi) and take exit 27
towards Camas on the right, follow the exit 1.3 km (0.8 mi) around to the north
and then east, merge onto WA 14 Lewis and Clark Highway and proceed east 12.4 km
(7.7 mi) to the exit for Front Street / Frontage Road, take the exit and proceed
east 0.6 km (0.4 mi) on Front Street / Frontage Road to the traffic circle,
proceed straight through the traffic circle and continue east on Front Street /
Frontage Road for 0.6 km (0.4 mi) to the next traffic circle, take the first
exit onto Second Street / Port Street and proceed south 0.1 km (0.1 mi) to the
waterfront park and the tide station at the SE corner of the seawall along the
river. The bench marks are in the Port of Camas-Washougal Marina and along SE
Union Street.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1002-31 2010
DESIGNATION: 1002 31
MONUMENTATION: Survey disk VM#: 22089
AGENCY: USACE IDB PID#:
SETTING CLASSIFICATION: Concrete ramp landing on bedrock OPUS PID:
LATITUDE: 45° 34.6' N ( 45.57731) LONGITUDE: 122° 22.7' W (-122.37814)
The primary mark is a disk set in a concrete landing on bedrock, 20.60 m (67.6
ft) South on a slant distance of power pole with light and tag number PUD 43665
a1313, 20.45 m (67.1 ft) NE of piling for floating dock, 3.18 m (10.4 ft) West
of the SE corner of concrete pad, 1.06 m (3.5 ft) NE of the NW corner of
concrete pad and about 1.40 m (4.6 ft) above the bedrock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9440047 PUBLICATION DATE: 04/04/2017
Name: WASHOUGAL, COLUMBIA RIVER
WA
NOAA Chart: 18531 Latitude: 45° 34.7' N ( 45.57830)
USGS Quad: CAMAS Longitude: 122° 22.9' W (-122.38200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0047 A 2016
DESIGNATION: 944 0047 A
MONUMENTATION: Bench Mark disk VM#: 22091
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete abutment for ramp OPUS PID:
LATITUDE: 45° 34.7' N ( 45.57831) LONGITUDE: 122° 22.8' W (-122.37958)
The benchmark is a disk set in the W side of the concrete abutment for the ramp
down to the floating docks, 34.56 m (113.4 ft) East of a power pole on the South
side of road with tag PUD 2569, 8.73 m (28.6 ft) SW of the SW corner of a green
electric utility box, 1.44 m (4.7 ft) South of the West most of three steel
bollards, 0.52 m (1.7 ft) West of horizontal steel beam along West side of
concrete platform, 0.29 m (1.0 ft) South of chain link fence along edge of road
and about 0.34 m (1.1 ft) lower than the road.
BENCH MARK STAMPING: 0047 B 2016
DESIGNATION: 944 0047 B
MONUMENTATION: Bench Mark disk VM#: 22092
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete platform OPUS PID:
LATITUDE: 45° 34.7' N ( 45.57825) LONGITUDE: 122° 22.9' W (-122.38089)
The benchmark is a disk set in a concrete platform for gated access to the
marina floating docks, 38.44 m (126.1 ft) North of NE most steel piling for
floating dock along East side of boat ramp, 15.73 m (51.6 ft) East of South end
of guard rail on West side of boat ramp, 13.58 m (44.6 ft) South of power pole
with tag v2561476, 5.18 m (17.0 ft) South of North most of three bollards along
East side of boat ramp, 0.43 m (1.4 ft) North of South edge of concrete pad and
about 0.36 m (1.2 ft) higher than the boat ramp.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9440047 PUBLICATION DATE: 04/04/2017
Name: WASHOUGAL, COLUMBIA RIVER
WA
NOAA Chart: 18531 Latitude: 45° 34.7' N ( 45.57830)
USGS Quad: CAMAS Longitude: 122° 22.9' W (-122.38200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1002-06 2010
DESIGNATION: 1002 06
MONUMENTATION: Survey disk VM#: 22093
AGENCY: USACE IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 45° 34.7' N ( 45.57817) LONGITUDE: 122° 22.9' W (-122.38206)
The benchmark is a disk set in the concrete pad for a picnic table along the
South side of the park, 42.20 m (138.5 ft) West of SW corner of viewing deck,
30.43 m (99.8 ft) East of war memorial, 22.30 m (73.2 ft) West of concrete lamp
post, 11.26 m (36.9 ft) SE of concrete lamp post, 4.24 m (13.9 ft) East of the
SW corner of concrete pad, and 0.41 m (1.3 ft) NW of the SE corner of concrete
pad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9440047 PUBLICATION DATE: 04/04/2017
Name: WASHOUGAL, COLUMBIA RIVER
WA
NOAA Chart: 18531 Latitude: 45° 34.7' N ( 45.57830)
USGS Quad: CAMAS Longitude: 122° 22.9' W (-122.38200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: GP06500-44 1994
DESIGNATION: GP06500 44
MONUMENTATION: Survey disk VM#: 22094
AGENCY: WADT IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 45° 35.0' N ( 45.58283) LONGITUDE: 122° 23.1' W (-122.38542)
The benchmark is a disk set in a concrete monument under a steel monument cover,
22.20 m (72.8 ft) North of a manhole cover, 21.09 m (69.2 ft) NW of power pole
with light and tag 001357, 17.95 m (58.9 ft) SE of the SW corner of a
self-storage building, 15.16 m (49.7 ft) SE of a power pole with light and tag
360962, 13.35 m (43.8 ft) NE of the centerline of road and about 0.18 m (0.6 ft)
lower than the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9440047 PUBLICATION DATE: 04/04/2017
Name: WASHOUGAL, COLUMBIA RIVER
WA
NOAA Chart: 18531 Latitude: 45° 34.7' N ( 45.57830)
USGS Quad: CAMAS Longitude: 122° 22.9' W (-122.38200)
T I D A L D A T U M S
Tidal datums at WASHOUGAL, 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 = 0.563
MEAN HIGH WATER MHW = 0.448
MEAN TIDE LEVEL MTL = 0.267
MEAN SEA LEVEL MSL = 0.247
MEAN LOW WATER MLW = 0.087
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1002-31 2010 5.536 5.088
0047 A 2016 5.816 5.368
0047 B 2016 5.570 5.122
1002-06 2010 8.894 8.446
GP06500-44 1994 11.317 10.869
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9440047 PUBLICATION DATE: 04/04/2017
Name: WASHOUGAL, COLUMBIA RIVER
WA
NOAA Chart: 18531 Latitude: 45° 34.7' N ( 45.57830)
USGS Quad: CAMAS Longitude: 122° 22.9' W (-122.38200)
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.