U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 10/23/2000
Station ID: 8453033 SUPERCEDED DATE: 04/21/2003
Name: BAY SPRING, BULLOCK COVE
RHODE ISLAND
NOAA Chart: 13224 Latitude: 41° 45.1' N
USGS Quad: EAST PROVIDENCE Longitude: 71° 22.1' W
To reach the tidal bench marks from I-195, take exit 7 and proceed south on
Route 114 for 4.8 km (3.0 mi) to Forbes Street, then west on Forbes Street for
2.3 km (1.4 mi) to Willet Avenue, then south on Willet Avenue for 2.1 km (1.3
mi) to Metropolitan Park Drive (which also has a sign indicating the way to
Haines Park), then south on Metropolitan Park Drive for 1.0 km (0.6 mi) to Cove
Haven Marina. The bench marks are located on the marina property and across
Metropolitan Park Drive from the Marina entrance. The tide gage and staff were
located on the southermost boat deployment ramp.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3033 C 1994
DESIGNATION: 845 3033 C
MONUMENTATION: Tidal Station disk VM#: 12877
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Building foundation
The primary bench mark is a disk set in the concrete foundation on the SE side
of Building 1 at Cove Haven Marina, 15.36 m (50.4 ft) SW of the NE corner of the
workshop and storage building (Bldg. 1), 15.00 m (49.2 ft) NW of the NW wall of
Bldg. 2, 8.81 m (28.9 ft) NE of the SW side of the Bldg. 1 bay door, and 0.1 m
(0.3 ft) above ground.
BENCH MARK STAMPING: 3033 A 1994
DESIGNATION: 845 3033 A
MONUMENTATION: Tidal Station disk VM#: 12878
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete fuel pad
The bench mark is a disk set in the SW area of the Marina on a concrete fuel
pad, 26.49 m (86.9 ft) south of the SW corner of the marina office, 14.81 m
(48.6 ft) WNW of power pole No. 3, 3.81 m (12.5 ft) NNE of a chain link fence,
and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 10/23/2000
Station ID: 8453033 SUPERCEDED DATE: 04/21/2003
Name: BAY SPRING, BULLOCK COVE
RHODE ISLAND
NOAA Chart: 13224 Latitude: 41° 45.1' N
USGS Quad: EAST PROVIDENCE Longitude: 71° 22.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3033 B 1994
DESIGNATION: 845 3033 B
MONUMENTATION: Tidal Station disk VM#: 12879
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete bulkhead
The bench mark is a disk set on the concrete bulkhead at the NW corner of the
marina parking lot, 18.90 m (62.0 ft) north of the ramp leading to the floating
docks, 1.10 m (3.6 ft) SW of a light pole, 0.49 m (1.6 ft) east of the west edge
of the bulkhead, 0.21 m (0.7 ft) above the ground.
BENCH MARK STAMPING: 3033 D 1994
DESIGNATION: 845 3033 D
MONUMENTATION: Tidal Station disk VM#: 12880
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete ramp to building
The bench mark is a disk set in the concrete footing of the storage building
(Bldg. 3), 24.90 m (81.7 ft) SSE of the SW corner of Bldg. 2, 23.90 m (78.4 ft)
WSW of the NE corner of Bldg. 3, 1.71 m (5.6 ft) NNW of NW corner of Bldg. 3,
and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 10/23/2000
Station ID: 8453033 SUPERCEDED DATE: 04/21/2003
Name: BAY SPRING, BULLOCK COVE
RHODE ISLAND
NOAA Chart: 13224 Latitude: 41° 45.1' N
USGS Quad: EAST PROVIDENCE Longitude: 71° 22.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3033 E 1994
DESIGNATION: 845 3033 E
MONUMENTATION: Tidal Station disk VM#: 12881
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Stainless steel rod
The bench mark is a disk located east of the entrance of Cove Haven Marina,
12.31 m (40.4 ft) east of the centerline of the road (Metropolitan Park
Drive/Narragansett Rd), 6.71 m (22.0 ft) ENE of power pole No. 11, and 4.60 m
(15.1 ft) NE of the NW corner of a fence. The bench mark is 9 cm (0.3 ft) below
ground level, crimped to a stainless steel rod driven 9.8 m (32 ft) to refusal
and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 10/23/2000
Station ID: 8453033 SUPERCEDED DATE: 04/21/2003
Name: BAY SPRING, BULLOCK COVE
RHODE ISLAND
NOAA Chart: 13224 Latitude: 41° 45.1' N
USGS Quad: EAST PROVIDENCE Longitude: 71° 22.1' W
T I D A L D A T U M S
Tidal datums at BAY SPRING, BULLOCK COVE based on:
LENGTH OF SERIES: 118 HW and 117 LW
TIME PERIOD: August 4 - October 3, 1994
TIDAL EPOCH: 1960-1978
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 = 1.453
MEAN HIGH WATER MHW = 1.374
MEAN TIDE LEVEL MTL = 0.715
MEAN SEA LEVEL MSL = 0.680
MEAN LOW WATER MLW = 0.057
MEAN LOWER LOW WATER MLLW = 0.000
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
3033 C 1994 4.607 3.233
3033 A 1994 3.810 2.437
3033 B 1994 3.884 2.510
3033 D 1994 4.719 3.345
3033 E 1994 5.252 3.879
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 10/23/2000
Station ID: 8453033 SUPERCEDED DATE: 04/21/2003
Name: BAY SPRING, BULLOCK COVE
RHODE ISLAND
NOAA Chart: 13224 Latitude: 41° 45.1' N
USGS Quad: EAST PROVIDENCE Longitude: 71° 22.1' W
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 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.