U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8677406 PUBLICATION DATE: 07/12/2012
Name: HOWE STREET PIER, EAST RIVER, BRUNSWICK
GA
NOAA Chart: 11506 Latitude: 31° 8.7' N ( 31.14456)
USGS Quad: BRUNSWICK EAST Longitude: 81° 29.8' W ( -81.49681)
To reach the tidal bench marks from the New City Hall building in Brunswick, at
the intersection of Gloucester and Reynolds Street proceed west on Gloucester
Street to its intersection with Bay Street, south on Bay Street to its
intersection with Howe Street, turn right onto Howe Street, and then to the East
River and the Howe Street Pier. The bench marks are in the vicinity of the old
and the new city hall and the police station. The tide gage and staff were
located on the right section of T shaped Howe Street Pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7230 A 2012
DESIGNATION: 867 7230 A
MONUMENTATION: Tidal Station disk VM#: 20332
AGENCY: ASMS IDB PID#:
SETTING CLASSIFICATION: OPUS PID#: BBCR73
LATITUDE: 31° 8.7' N ( 31.14464) LONGITUDE: 81° 29.8' W ( -81.49667)
The primary bench mark is a disk set on top of a concrete pad located in the
Brunswick, GA city docks, 63.4 m (208 ft) south-southeast of the southwest
corner of the northernmost warehouse, 49.4 m (162 ft) south-southwest of a fire
hydrant, 38.4 m (126 ft) east of waterside edge of loading dock, 13.8 m (45.42
ft) north of a utility pole numbered 3585, 0.6 m (2 ft) north of the southern
edge of concrete wall. The datum point is flush with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8677406 PUBLICATION DATE: 07/12/2012
Name: HOWE STREET PIER, EAST RIVER, BRUNSWICK
GA
NOAA Chart: 11506 Latitude: 31° 8.7' N ( 31.14456)
USGS Quad: BRUNSWICK EAST Longitude: 81° 29.8' W ( -81.49681)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Q 147
DESIGNATION: 867 7406 Q 147
MONUMENTATION: Survey disk VM#: 4934
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BR0034
SETTING CLASSIFICATION: Set in brick face of building OPUS PID:
LATITUDE: 31° 8.7' N ( 31.14500) LONGITUDE: 81° 29.9' W ( -81.49830)
The bench mark is a disk located at the intersection of Mansfield and Bay
Streets, at the old section of the police department building, 33.53 m (110.0
ft) east of the centerline of Bay Street, 10.36 m (34.0 ft) south of the south
curb of Mansfield Street, and 0.3 m (1.0 ft) east of the NW corner of the old
building section.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8677406 PUBLICATION DATE: 07/12/2012
Name: HOWE STREET PIER, EAST RIVER, BRUNSWICK
GA
NOAA Chart: 11506 Latitude: 31° 8.7' N ( 31.14456)
USGS Quad: BRUNSWICK EAST Longitude: 81° 29.8' W ( -81.49681)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO STAMPING L 10
DESIGNATION: L 10
MONUMENTATION: Chiseled Square VM#: 20383
AGENCY: ASMS IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 31° 8.8' N ( 31.14614) LONGITUDE: 81° 29.7' W ( -81.49436)
The bench mark is a chiseled square cut in a marble step located about 14.7 km
(9.1 mi) north-northeast of Dover Bluff, 14.4 km (8.9 mi) west-southwest of Sea
Island in the town of Brunswick GA, at the main east side entrance of City Hall,
on the southwest corner of Newcastle and Mansfield street, on the north side of
the Newcastle street entrance. The bench mark is set on the second step of the
stairs, 0.3 m (1.0 ft) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8677406 PUBLICATION DATE: 07/12/2012
Name: HOWE STREET PIER, EAST RIVER, BRUNSWICK
GA
NOAA Chart: 11506 Latitude: 31° 8.7' N ( 31.14456)
USGS Quad: BRUNSWICK EAST Longitude: 81° 29.8' W ( -81.49681)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO STAMPING M 10
DESIGNATION: M 10
MONUMENTATION: Bench Mark disk VM#: 20384
AGENCY: IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 31° 9.0' N ( 31.14975) LONGITUDE: 81° 29.7' W ( -81.49419)
The bench mark is a vertical disk located about 15.0 km (9.3 mi) south-southeast
of Sterling, 14.2 km (8.8 mi) west-southwest of Sea Island in the town of
Brunswick GA, 24.7 m (81.0 ft) north of the northern curb line of Gloucester St,
14.0 m (45.9 ft) east of the east curb of Reynolds St, 0.2 m (0.7 ft) above the
bottom step of the steps leading to the loading dock at the rear or the post
office. The bench mark is a disk set vertically in the north face of the west
wing of the post office building, 0.6 m (2.0 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8677406 PUBLICATION DATE: 07/12/2012
Name: HOWE STREET PIER, EAST RIVER, BRUNSWICK
GA
NOAA Chart: 11506 Latitude: 31° 8.7' N ( 31.14456)
USGS Quad: BRUNSWICK EAST Longitude: 81° 29.8' W ( -81.49681)
T I D A L D A T U M S
Tidal datums at HOWE STREET PIER, EAST RIVER, BRUNSWICK based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: February 2012 - April 2012
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8720030 FERNANDINA BEACH, AMELIA RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 2.351
MEAN HIGH WATER MHW = 2.239
MEAN SEA LEVEL MSL = 1.221
MEAN TIDE LEVEL MTL = 1.153
MEAN LOW WATER MLW = 0.067
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7230 A 2012 3.900 1.661
Q 147 4.558 2.319
NO STAMPING L 10 3.485 1.246
NO STAMPING M 10 6.525 4.286
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8677406 PUBLICATION DATE: 07/12/2012
Name: HOWE STREET PIER, EAST RIVER, BRUNSWICK
GA
NOAA Chart: 11506 Latitude: 31° 8.7' N ( 31.14456)
USGS Quad: BRUNSWICK EAST Longitude: 81° 29.8' W ( -81.49681)
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.