U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8453433 PUBLICATION DATE: 04/21/2003
Name: RUMFORD, SEEKONK RIVER
RI
NOAA Chart: 13224 Latitude: 41° 50.4' N ( 41.84000)
USGS Quad: EAST PROVIDENCE Longitude: 71° 22.4' W ( -71.37330)
To reach the tidal bench marks from I-95 take exit 28 - Route 114, proceed south
on Route 114 for 3.4 km (2.1 mi) to Roger Williams Avenue, then south on Roger
Williams Avenue for 1.4 km (0.9 mi) to Bourne Avenue, continue west on Bourne
Avenue for 0.2 km (0.1 mi) to Ocean State Steel, Inc. The bench marks are
located on the steel plant property and on the railroad trestle east of the
plant, and the tide gage and staff were located on the wood pier at the NW end
of the plant.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3433 A 1994
DESIGNATION: 845 3433 A
MONUMENTATION: Tidal Station disk VM#: 12893
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete footing OPUS PID:
LATITUDE: 41° 50.5' N ( 41.84170) LONGITUDE: 71° 22.3' W ( -71.37170)
The primary bench mark is a disk set in the top of the concrete foundation for
the pump station located in the NW corner of the Ocean State Steel Company
property, 16.49 m (54.1 ft) NE of the east corner of the steel plant concrete
bulkhead, 3.11 m (10.2 ft) NW of the west wall of the pump station, 0.21 m (0.7
ft) east of the edge of the foundation, and 0.79 m (2.6 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8453433 PUBLICATION DATE: 04/21/2003
Name: RUMFORD, SEEKONK RIVER
RI
NOAA Chart: 13224 Latitude: 41° 50.4' N ( 41.84000)
USGS Quad: EAST PROVIDENCE Longitude: 71° 22.4' W ( -71.37330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3433 B 1994
DESIGNATION: 845 3433 B
MONUMENTATION: Tidal Station disk VM#: 12894
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete retaining wall OPUS PID:
LATITUDE: 41° 50.4' N ( 41.84000) LONGITUDE: 71° 22.3' W ( -71.37170)
The bench mark is a disk set in the top of a concrete retaining wall located in
the SW area of the Ocean State Steel Company property, 47.21 m (154.9 ft) SW of
the SW corner of the Steel Company maintenance shop, 5.61 m (18.4 ft) ESE of the
west corner of the retaining wall, and 0.61 m (2.0 ft) south of the north face
of the retaining wall.
BENCH MARK STAMPING: 3433 C 1994
DESIGNATION: 845 3433 C
MONUMENTATION: Tidal Station disk VM#: 12895
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete footing OPUS PID:
LATITUDE: 41° 50.5' N ( 41.84170) LONGITUDE: 71° 22.3' W ( -71.37170)
The bench mark is a disk set in the NW corner of the concrete foundation for the
liquid oxygen tanks located east of the Billet Building in the NE area of the
steel plant, 10.30 m (33.8 ft) east of the north corner of the Billet Building,
3.81 m (12.5 ft) SW of the concrete wall along the NE end of the foundation,
0.21 m (0.7 ft) east of the west corner of foundation, and 0.70 m (2.3 ft) above
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8453433 PUBLICATION DATE: 04/21/2003
Name: RUMFORD, SEEKONK RIVER
RI
NOAA Chart: 13224 Latitude: 41° 50.4' N ( 41.84000)
USGS Quad: EAST PROVIDENCE Longitude: 71° 22.4' W ( -71.37330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3433 D 1994
DESIGNATION: 845 3433 D
MONUMENTATION: Tidal Station disk VM#: 12896
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete landing OPUS PID:
LATITUDE: 41° 50.5' N ( 41.84170) LONGITUDE: 71° 22.1' W ( -71.36830)
The bench mark is a disk set in the concrete landing for the entrance to the
Ocean State Steel Company property, 7.99 m (26.2 ft) NW of the NE corner of the
Ocean State Steel Company Building, 2.80 m (9.2 ft) NNE of the north wall of the
building, 0.49 m (1.6 ft) ESE of the east wall of the building, and 0.09 m (0.3
ft) above ground.
BENCH MARK STAMPING: 3433 E 1994
DESIGNATION: 845 3433 E
MONUMENTATION: Tidal Station disk VM#: 12897
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID:
LATITUDE: 41° 50.3' N ( 41.83830) LONGITUDE: 71° 22.1' W ( -71.36830)
The bench mark is a disk set in the NE concrete abutment of the railroad tresle
just SE of the Ocean State Steel Company property, 38.89 m (127.6 ft) south of
steel power pole number 27, 2.41 m (7.9 ft) east of the centerline of the
railroad tracks, and 2.01 m (6.6 ft) west of the east end of the concrete
abutment.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8453433 PUBLICATION DATE: 04/21/2003
Name: RUMFORD, SEEKONK RIVER
RI
NOAA Chart: 13224 Latitude: 41° 50.4' N ( 41.84000)
USGS Quad: EAST PROVIDENCE Longitude: 71° 22.4' W ( -71.37330)
T I D A L D A T U M S
Tidal datums at RUMFORD, SEEKONK RIVER based on:
LENGTH OF SERIES: 4 Months
TIME PERIOD: June 1994 - September 1994
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8454000 PROVIDENCE, PROVIDENCE RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.550
MEAN HIGH WATER MHW = 1.476
MEAN TIDE LEVEL MTL = 0.766
MEAN SEA LEVEL MSL = 0.722
MEAN LOW WATER MLW = 0.056
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
3433 A 1994 3.513 2.037
3433 B 1994 7.622 6.146
3433 C 1994 8.152 6.676
3433 D 1994 8.367 6.891
3433 E 1994 6.394 4.918
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8453433 PUBLICATION DATE: 04/21/2003
Name: RUMFORD, SEEKONK RIVER
RI
NOAA Chart: 13224 Latitude: 41° 50.4' N ( 41.84000)
USGS Quad: EAST PROVIDENCE Longitude: 71° 22.4' W ( -71.37330)
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.