U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8440889 PUBLICATION DATE: 09/26/2003
Name: RIVERSIDE, MERRIMACK RIVER
MA
NOAA Chart: 13274 Latitude: 42° 45.8' N ( 42.76330)
USGS Quad: HAVERHILL Longitude: 71° 4.6' W ( -71.07670)
To reach the tidal bench marks from the intersection of Groveland Street and
Lincoln Avenue in Riverside, proceed SE on Groveland Street for 0.2 km (0.1 mi)
to Bates Bridge (State Highway 97) over Merrimack River. The bench marks are
near the bridge, the Haverhill-Riverside Airport, and along Lincoln Street. The
tide station was located on the NE bridge fender.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8440889 PUBLICATION DATE: 09/26/2003
Name: RIVERSIDE, MERRIMACK RIVER
MA
NOAA Chart: 13274 Latitude: 42° 45.8' N ( 42.76330)
USGS Quad: HAVERHILL Longitude: 71° 4.6' W ( -71.07670)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: S 35 1966
DESIGNATION: S 35
MONUMENTATION: Bench Mark disk VM#: 1475
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: MY0397
SETTING CLASSIFICATION: Bridge abutment OPUS PID:
LATITUDE: 42° 45.9' N ( 42.76500) LONGITUDE: 71° 2.1' W ( -71.03530)
The primary bench mark is a disk set in the top of the north end of the west
concrete abutment of Bates Bridge (State Highway 97), 3 m (10 ft) north of the
north curb of the highway, 0.18 m (0.6 ft) north of the guard rail post, and
0.30 m (1.0 ft) above the level of the highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8440889 PUBLICATION DATE: 09/26/2003
Name: RIVERSIDE, MERRIMACK RIVER
MA
NOAA Chart: 13274 Latitude: 42° 45.8' N ( 42.76330)
USGS Quad: HAVERHILL Longitude: 71° 4.6' W ( -71.07670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: U 35 1966
DESIGNATION: U 35
MONUMENTATION: Bench Mark disk VM#: 1476
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: MY0394
SETTING CLASSIFICATION: Concrete doorsill OPUS PID:
LATITUDE: 42° 46.1' N ( 42.76880) LONGITUDE: 71° 2.0' W ( -71.03370)
The bench mark is a disk set in the top of the SW end of the concrete doorsill
to the helicopter room in a large hanger at the airport, 0.5 km (0.3 mi) NE
along Coffin Avenue from its instersection with State Highway 97, on the SE side
of the runway, 4 m (12 ft) SW of the north corner of the hanger, 0.18 m (0.6 ft)
NE of the SW door facing, and level with the runway.
BENCH MARK STAMPING: 0889 A 1989
DESIGNATION: 844 0889 A
MONUMENTATION: Tidal Station disk VM#: 1477
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete retaining wall OPUS PID:
LATITUDE: 42° 45.8' N ( 42.76330) LONGITUDE: 71° 4.6' W ( -71.07670)
The bench mark is a disk set flush in the west end of a concrete retaining wall
at the south entrance to Pentucket Bank near the intersection of Lincoln and
Burnham Streets, 8.17 m (26.8 ft) ESE of the SW corner of the bank, 7.07 m (23.2
ft) WSW of the SE corner of the bank, 1.52 m (5.0 ft) west of the east end of
the wall, and 0.67 m (2.2 ft) above the pavement.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8440889 PUBLICATION DATE: 09/26/2003
Name: RIVERSIDE, MERRIMACK RIVER
MA
NOAA Chart: 13274 Latitude: 42° 45.8' N ( 42.76330)
USGS Quad: HAVERHILL Longitude: 71° 4.6' W ( -71.07670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0889 B 1989
DESIGNATION: 844 0889 B
MONUMENTATION: Tidal Station disk VM#: 1478
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete head wall OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The bench mark is a disk set flush in the west end of a concrete headwall at
Domenic Puglielli Memorial Field in Riverside Park, on the south side of Lincoln
Street near the intersection of Cromwell Street, 9.97 m (32.7 ft) SW of a steel
light pole, 9.63 m (31.6 ft) SE of the northernmost square wooden guard rail
post, and 0.27 m (0.9 ft) east of the west end of the headwall.
BENCH MARK STAMPING: 69AA
DESIGNATION: 844 0889 69AA
MONUMENTATION: Traverse Station disk VM#: 1479
AGENCY: Massachusetts Department of Public Works
(DPW) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: ' °deg (0) LONGITUDE: ' °deg (0)
The bench mark is a disk set in a concrete monument near the inter-section of
Lincoln and Groveland Streets, 152 m (500 ft) NW or the Riverside end of Bates
Bridge, 36.06 m (118.3 ft) NW of the intersection of Lincoln and Groveland
Streets, 21.15 m (69.4 ft) SW of the NW corner of the residence at #496
Groveland Street, 7.53 m (24.7 ft) SW of the centerline of Groveland Street,
0.15 m (0.5 ft) below the pavement, and covered with a water gate cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8440889 PUBLICATION DATE: 09/26/2003
Name: RIVERSIDE, MERRIMACK RIVER
MA
NOAA Chart: 13274 Latitude: 42° 45.8' N ( 42.76330)
USGS Quad: HAVERHILL Longitude: 71° 4.6' W ( -71.07670)
T I D A L D A T U M S
Tidal datums at RIVERSIDE, MERRIMACK RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: July 1989 - September 1989
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8440466 NEWBURYPORT, MERRIMACK RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.921
MEAN HIGH WATER MHW = 1.780
MEAN TIDE LEVEL MTL = 0.908
MEAN SEA LEVEL MSL = 0.847
North American Vertical Datum NAVD88 = 0.420
MEAN LOW WATER MLW = 0.037
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
S 35 1966 7.166 5.386
U 35 1966 4.919 3.139
0889 A 1989 6.044 4.264
0889 B 1989 5.225 3.445
69AA 4.992 3.212
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8440889 PUBLICATION DATE: 09/26/2003
Name: RIVERSIDE, MERRIMACK RIVER
MA
NOAA Chart: 13274 Latitude: 42° 45.8' N ( 42.76330)
USGS Quad: HAVERHILL Longitude: 71° 4.6' W ( -71.07670)
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.