U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9432780 PUBLICATION DATE: 09/27/2011
Name: CHARLESTON, COOS BAY
OR
NOAA Chart: 18587 Latitude: 43° 20.7' N ( 43.34500)
USGS Quad: CHARLESTON Longitude: 124° 19.3' W (-124.32200)
To reach the tidal bench marks from the center of the draw bridge over South
Slough in Charleston, proceed west 273.0 m (895.6 ft) to the first road on the
right (Boat Basin Drive), turn right (northwest) and proceed 372.0 m (1,220 ft)
to Kingfisher Drive, turn right (northeast) and continue 488 m (1601 ft) along
the perimeter of the boat basin to the USCG boat house. The tide station is
located in the boat house. The bench marks are located on the U.S. Coast Guard
compound and in the vicinity of the boat basin.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2780 A 1981
DESIGNATION: 943 2780 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 1046
AGENCY: National Ocean Survey (NOS) IDB PID#: OA0650
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID#: OA0650
LATITUDE: 43° 20.7' N ( 43.34475) LONGITUDE: 124° 19.5' W (-124.32578)
The primary bench mark is a disk located inside north end of Charleston Travel
RV park, 121 m (397 ft) west of bench mark TIDAL 8 1970, 41.80 m (137.1 ft) SE
of the SE corner of the white wooden building of Seahawk Seafood, 7.50 m (24.6
ft) south of the centerline of Guano Rock Boulevard, 1.01 m (3.3 ft) SE of 2 m
(6 ft) chain link fence which surrounds RV park, and 1.01 m (3.3 ft) SE of NOS
orange and white metal witness post. The bench mark is set below ground level,
crimped to the top of a 1/2-inch galvanized steel rod, driven to a depth of 14.6
m (47.9 ft), and encased by a 4-inch PVC plastic pipe and cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9432780 PUBLICATION DATE: 09/27/2011
Name: CHARLESTON, COOS BAY
OR
NOAA Chart: 18587 Latitude: 43° 20.7' N ( 43.34500)
USGS Quad: CHARLESTON Longitude: 124° 19.3' W (-124.32200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL 8 1970
DESIGNATION: 943 2780 TIDAL 8
MONUMENTATION: Tidal Station disk VM#: 1048
AGENCY: National Ocean Survey (NOS) IDB PID#: OA0649
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 43° 20.7' N ( 43.34472) LONGITUDE: 124° 19.5' W (-124.32428)
The bench mark is a disk set in the concrete curb adjacent to the sidewalk
located at the U.S. Coast Guard Coos Bay Station at the Charleston Boat Basin,
east of and in line with the extended NE corner wall of the concrete block
repair shop and garage, 27 m (87 ft) north of a flagpole, 7.50 m (24.6 ft) south
of the north end of the curb, and 3.60 m (11.8 ft) east of the NE corner of the
building.
BENCH MARK STAMPING: TIDAL 9 1970
DESIGNATION: 943 2780 TIDAL 9
MONUMENTATION: Tidal Station disk VM#: 1049
AGENCY: National Ocean Survey (NOS) IDB PID#: OA0651
SETTING CLASSIFICATION: Concrete base of flagpole OPUS PID#: OA0651
LATITUDE: 43° 20.7' N ( 43.34447) LONGITUDE: 124° 19.7' W (-124.32756)
The bench mark is a disk set in the 1.8 m (5.9 ft) square concrete base for the
flagpole at the Coos Bay Power Squadron Building located in the west central
portion of the Charleston Boat Basin, 14.50 m (47.6 ft) south of the centerline
of Guano Rock Boulevard, 3.81 m (12.5 ft) north of the building, 0.61 m (2.0 ft)
north of the flagpole, and 0.30 m (1 ft) south of the center of the north edge
of the concrete slab.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9432780 PUBLICATION DATE: 09/27/2011
Name: CHARLESTON, COOS BAY
OR
NOAA Chart: 18587 Latitude: 43° 20.7' N ( 43.34500)
USGS Quad: CHARLESTON Longitude: 124° 19.3' W (-124.32200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL 10 1970
DESIGNATION: 943 2780 TIDAL 10
MONUMENTATION: Tidal Station disk VM#: 1050
AGENCY: National Ocean Survey (NOS) IDB PID#: OA0653
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 43° 20.8' N ( 43.34744) LONGITUDE: 124° 19.8' W (-124.32922)
The bench mark is a disk set at east end of the concrete curb, at the north edge
of the parking area located on the south side of the U.S. Coast Guard Family
Housing building, 91.40 m (299.9 ft) NW of the NW corner of the Charleston Boat
Basin, 15.70 m (51.5 ft) north of a fire hydrant, 13.20 (43.3 ft) east of the
south corner of the building, and 2.0 m (6.6 ft) SW of the centerline extended
of asphalt road on east side of the building.
BENCH MARK STAMPING: 2780 B 1981
DESIGNATION: 943 2780 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 1053
AGENCY: National Ocean Survey (NOS) IDB PID#: OA0645
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID#:
LATITUDE: 43° 20.6' N ( 43.34389) LONGITUDE: 124° 19.5' W (-124.32425)
The bench mark is a disk located 69.20 m (227.0 ft) south of bench mark TIDAL
C.G.I PORTLAND DISTRICT 1976 RESET BM 1995, 23.70 m (77.8 ft) south of the SE
corner of the U.S. Coast Guard Coos Bay Building, 8.20 m (26.9 ft) south of the
centrerline of Kingfisher Drive, 8.02 m (26.3 ft) SE of a 15-MPH speed sign, and
0.30 m (1 ft) SE of 4" x 4" cedar witness post. The bench mark is set 0.30 m (1
ft) below the ground level, crimped to the top of a 1/2 inch galvanized steel
rod driven to a depth of 14.6 m (47.9 ft), and encased in a 4 inch PVC plastic
pipe and cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9432780 PUBLICATION DATE: 09/27/2011
Name: CHARLESTON, COOS BAY
OR
NOAA Chart: 18587 Latitude: 43° 20.7' N ( 43.34500)
USGS Quad: CHARLESTON Longitude: 124° 19.3' W (-124.32200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2780 C 1981
DESIGNATION: 943 2780 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 1054
AGENCY: National Ocean Survey (NOS) IDB PID#: OA0644
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 43° 20.6' N ( 43.34353) LONGITUDE: 124° 19.5' W (-124.32542)
The bench mark is a disk set in the SE corner of the Charleston Travel RV park,
104 m (341 ft) west of bench mark 2780 B 1981, 11.83 m (38.8 ft) north of the
centerline of Kingfisher Drive, 4.15 m (13.6 ft) SW of a 4 X 4 post that
supports a RV PVC sewer drain vent, 3.75 m (12.3 ft) NW of NE support for a gate
on NE side of a RV office building, and 1.40 m (4.6 ft) north of NOS metal
witness sign post. the bench mark is set 0.40 m (1.3 ft) below a concrete
patio, crimped to the top of a 1/2-inch galvanized steel rod driven to a depth
14.3 m (46.9 ft) and, and encased by a 4-inch PVC plastic pipe with Aluminum
cover encased in concrete.
BENCH MARK STAMPING: TIDAL BM 11 1974
DESIGNATION: 943 2780 TIDAL 11
MONUMENTATION: Tidal Station disk VM#: 12563
AGENCY: National Ocean Survey (NOS) IDB PID#: OA0652
SETTING CLASSIFICATION: Building wall OPUS PID:
LATITUDE: 43° 20.8' N ( 43.34628) LONGITUDE: 124° 19.7' W (-124.32886)
The bench mark is a disk set vertically in the east wall of the Oregon Fish &
Wildlife, Charleston District, Office Building located at 4475 Boat Basin Drive,
13.0 m (42.7 ft) west of the centerline of Boat Basin Drive, 7.50 m (24.6 ft)
north of the north edge of a walk leading to the entrance of the building, 1.20
m (3.9 ft) south of the NE corner of the building, 0.09 m (0.3 ft) north and
beneath the most northerly window, and 0.21 m (0.7 ft) above the natural grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9432780 PUBLICATION DATE: 09/27/2011
Name: CHARLESTON, COOS BAY
OR
NOAA Chart: 18587 Latitude: 43° 20.7' N ( 43.34500)
USGS Quad: CHARLESTON Longitude: 124° 19.3' W (-124.32200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL C.G. 1 PORTLAND DISTRICT
1976 RESET BM 1995
DESIGNATION: 943 2780 TIDAL CG 1
ALIAS: RESET 1995
MONUMENTATION: Bench Mark disk VM#: 12606
AGENCY: US Army Corps of Engineers (USE) IDB PID#: OA0646
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 43° 20.7' N ( 43.34436) LONGITUDE: 124° 19.5' W (-124.32428)
The bench mark is a disk, set in a concrete pad supporting a flagpole on the
east side of the main U.S. Coast Guard building in Charleston, 1.50 m (4.9 ft)
east of the SW corner of a concrete ramp leading to main Coast Guard building,
1.30 m (4.3 ft) NNW of a metal pole supporting a brass bell, and 1.20 m (3.9 ft)
NNW of the NE corner of the metal flag pole.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9432780 PUBLICATION DATE: 09/27/2011
Name: CHARLESTON, COOS BAY
OR
NOAA Chart: 18587 Latitude: 43° 20.7' N ( 43.34500)
USGS Quad: CHARLESTON Longitude: 124° 19.3' W (-124.32200)
T I D A L D A T U M S
Tidal datums at CHARLESTON, COOS BAY based on:
LENGTH OF SERIES: 19 YEARS
TIME PERIOD: January 1983 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (01/26/1983) = 3.408
MEAN HIGHER HIGH WATER MHHW = 2.323
MEAN HIGH WATER MHW = 2.120
MEAN TIDE LEVEL MTL = 1.253
MEAN SEA LEVEL MSL = 1.244
MEAN LOW WATER MLW = 0.387
North American Vertical Datum NAVD88 = 0.152
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (05/18/2003) = -0.941
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2780 A 1981 4.749 2.629
TIDAL 8 1970 4.838 2.718
TIDAL 9 1970 5.000 2.880
TIDAL 10 1970 5.212 3.092
2780 B 1981 4.636 2.516
2780 C 1981 4.798 2.678
TIDAL BM 11 1974 5.208 3.088
TIDAL C.G. 1 PORTLAND DISTRICT 1976
RESET BM 1995 5.020 2.900
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9432780 PUBLICATION DATE: 09/27/2011
Name: CHARLESTON, COOS BAY
OR
NOAA Chart: 18587 Latitude: 43° 20.7' N ( 43.34500)
USGS Quad: CHARLESTON Longitude: 124° 19.3' W (-124.32200)
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.