U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8452660 PUBLICATION DATE: 04/21/2003
Name: NEWPORT, NARRAGANSETT BAY
RI
NOAA Chart: 13223 Latitude: 41° 30.3' N ( 41.50500)
USGS Quad: NEWPORT Longitude: 71° 19.6' W ( -71.32670)
To reach the tidal bench marks from the traffic circle at the intersection of
James T. Connell Memorial Road (State Route 238) and State Route 138 proceed
west for 0.5 km (0.3 mi) to Coasters Harbor Island U.S. Naval Complex gate.
Continue west on Luce Avenue for 0.2 km (0.1 mi) to Perry Road, south on Perry
for 0.2 km (0.1 mi) to a small boat pier. The gage and staff are located at the
east end of the pier. The bench marks are located within U.S. Naval Complex.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6 1943
DESIGNATION: 845 2660 TIDAL 6
MONUMENTATION: Tidal Station disk VM#: 221
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LW0493
SETTING CLASSIFICATION: Concrete slab OPUS PID#:
LATITUDE: 41° 30.4' N ( 41.50674) LONGITUDE: 71° 19.6' W ( -71.32669)
The primary bench mark is a disk set in the top of a concrete slab, located at
the intersection of Luce Avenue and Perry Road along the NW side of a small boat
basin, 82.0 m (269 ft) NE of bench mark NO 4 1934, 16.15 m (53.0 ft) SW of the
centerline of Luce Avenue, 0.40 m (1.3 ft) SW of the NE end of the slab, and
0.15 m (0.5 ft) NW of the basin's wooden bulkhead.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8452660 PUBLICATION DATE: 04/21/2003
Name: NEWPORT, NARRAGANSETT BAY
RI
NOAA Chart: 13223 Latitude: 41° 30.3' N ( 41.50500)
USGS Quad: NEWPORT Longitude: 71° 19.6' W ( -71.32670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 1 1930
DESIGNATION: 845 2660 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 218
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LW0489
SETTING CLASSIFICATION: Building OPUS PID:
LATITUDE: 41° 30.4' N ( 41.50747) LONGITUDE: 71° 19.7' W ( -71.32911)
The bench mark is a disk set vertically in the face of a granite block building
located at the intersection of Luce Avenue and Cushing Road, 23.41 m (76.8 ft)
north of the centerline of Luce Avenue, 5.49 m (18.0 ft) SW of the centerline of
Cushing Road, 0.82 m (2.7 ft) south of the NE corner of the south wing of the
building, and 0.06 m (0.2 ft) above ground.
BENCH MARK STAMPING: NO 4 1934
DESIGNATION: 845 2660 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 219
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LW0491
SETTING CLASSIFICATION: Concrete slab OPUS PID:
LATITUDE: 41° 30.4' N ( 41.50611) LONGITUDE: 71° 19.6' W ( -71.32703)
The bench mark is a disk set on top of a concrete slab, located 0.24 km (0.15
mi) SE along Luce Avenue from the east side of the War College Building, thence
0.08 km (0.05 mi) SE along Perry Road, on the NW side of a small boat basin,
9.60 m (31.5 ft) SE of the centerline of Perry Road, 0.76 m (2.5 ft) NW of the
east corner of brick Building No. 91, 0.24 m (0.8 ft) NW of the NW side of the
building, and 0.15 m (0.5 ft) NW of a wooden bulkhead.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8452660 PUBLICATION DATE: 04/21/2003
Name: NEWPORT, NARRAGANSETT BAY
RI
NOAA Chart: 13223 Latitude: 41° 30.3' N ( 41.50500)
USGS Quad: NEWPORT Longitude: 71° 19.6' W ( -71.32670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2660 G 1976
DESIGNATION: 845 2660 G
MONUMENTATION: Tidal Station disk VM#: 222
AGENCY: National Ocean Survey (NOS) IDB PID#: AH9447
SETTING CLASSIFICATION: Concrete slab OPUS PID:
LATITUDE: 41° 30.4' N ( 41.50714) LONGITUDE: 71° 19.7' W ( -71.32751)
The bench mark is a disk set in a concrete slab, located 64.0 m (210 ft) west of
the NW corner of the intersection of Perry Road and Luce Avenue, 30.78 m (101.0
ft) west of the SW corner of tennis courts, 30.36 m (99.6 ft) east of the NE
corner of the intersection of Luce Avenue and Bainbridge Road, and 5.49 m (18.0
ft) north of the centerline of Luce Avenue.
BENCH MARK STAMPING: 2660 K 1979
DESIGNATION: 845 2660 K
MONUMENTATION: Tidal Station disk VM#: 225
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock OPUS PID:
LATITUDE: 41° 30.5' N ( 41.50803) LONGITUDE: 71° 19.7' W ( -71.32844)
The bench mark is a disk set in bedrock, located north of Founders Hall, 63.1 m
(207 ft) north of the west wing of the Naval War College Museum, 52.19 m (171.2
ft) east of the centerline of Cushing Road, 9.28 m (30.4 ft) NW of the NW corner
of the wooden fence around a residence, and 4.80 m (15.7 ft) SE of the SE curb
of the road leading to a parking lot.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8452660 PUBLICATION DATE: 04/21/2003
Name: NEWPORT, NARRAGANSETT BAY
RI
NOAA Chart: 13223 Latitude: 41° 30.3' N ( 41.50500)
USGS Quad: NEWPORT Longitude: 71° 19.6' W ( -71.32670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7
DESIGNATION: 845 2660 TIDAL 7
ALIAS: 7
MONUMENTATION: Survey disk VM#: 226
AGENCY: New England Survey Service, Inc.
(Private) IDB PID#:
SETTING CLASSIFICATION: Concrete base of flagpole OPUS PID:
LATITUDE: 41° 30.4' N ( 41.50708) LONGITUDE: 71° 19.7' W ( -71.32828)
The bench mark is a disk set in the concrete base of a flag pole, located in
front of the Naval War College Museum in the immediate vicinity of two 24-pound
Howitzer cannons, 38.10 m (125.0 ft) SE of Light Pole No. USN 25-1, 12.80 m
(42.0 ft) south of the centerline of Luce Avenue, 7.50 m (24.6 ft) north of the
north face of the 1938 War Monument, and 1.90 m (6.2 ft) SSW of the flag pole.
BENCH MARK STAMPING: 2660 L 1986
DESIGNATION: 845 2660 L
MONUMENTATION: Tidal Station disk VM#: 228
AGENCY: National Ocean Survey (NOS) IDB PID#: AH9448
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: AH9448
LATITUDE: 41° 30.4' N ( 41.50623) LONGITUDE: 71° 19.7' W ( -71.32816)
The bench mark is a disk located at the NW corner of a parking lot at Building
No. 95, 85.0 m (279 ft) west of the centerline of Perry Road, 74.1 m (243 ft)
north of the NW corner of Building No. 95, and 3.00 m (9.8 ft) north of the NW
corner of the parking lot. The bench mark is crimped to a stainless steel rod
driven to an unspecified depth, and encased in a 6 inch PVC pipe with concrete
kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8452660 PUBLICATION DATE: 04/21/2003
Name: NEWPORT, NARRAGANSETT BAY
RI
NOAA Chart: 13223 Latitude: 41° 30.3' N ( 41.50500)
USGS Quad: NEWPORT Longitude: 71° 19.6' W ( -71.32670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2660 M 2001
DESIGNATION: 845 2660 M
MONUMENTATION: Tidal Station disk VM#: 16542
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete landing OPUS PID:
LATITUDE: 41° 30.3' N ( 41.50553) LONGITUDE: 71° 19.7' W ( -71.32756)
The bench mark is a disk set in the concrete landing at the top of four steps to
the service entrance on the east side of the Officer's Club (building number
95), 12.60 m (41.3 ft) south of the center of an electrical manhole cover, 10.30
m (33.8 ft) west of the centerline of the road, and 1.40 m (4.6 ft) NW of the NE
corner of the building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8452660 PUBLICATION DATE: 04/21/2003
Name: NEWPORT, NARRAGANSETT BAY
RI
NOAA Chart: 13223 Latitude: 41° 30.3' N ( 41.50500)
USGS Quad: NEWPORT Longitude: 71° 19.6' W ( -71.32670)
T I D A L D A T U M S
Tidal datums at NEWPORT, NARRAGANSETT 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 (09/21/1938) = 4.056
MEAN HIGHER HIGH WATER MHHW = 1.174
MEAN HIGH WATER MHW = 1.099
North American Vertical Datum NAVD88 = 0.622
MEAN TIDE LEVEL MTL = 0.571
MEAN SEA LEVEL MSL = 0.529
MEAN LOW WATER MLW = 0.042
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (02/03/1976) = -0.943
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6 1943 2.236 1.137
NO 1 1930 10.811 9.712
NO 4 1934 2.062 0.963
2660 G 1976 5.989 4.891
2660 K 1979 16.024 14.925
7 8.667 7.568
2660 L 1986 3.536 2.438
2660 M 2001 2.911 1.812
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 8452660 PUBLICATION DATE: 04/21/2003
Name: NEWPORT, NARRAGANSETT BAY
RI
NOAA Chart: 13223 Latitude: 41° 30.3' N ( 41.50500)
USGS Quad: NEWPORT Longitude: 71° 19.6' W ( -71.32670)
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.