U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8572955 PUBLICATION DATE: 04/18/2005
Name: LOVE POINT PIER, KENT ISLAND
MD
NOAA Chart: 12278 Latitude: 39° 1.9' N ( 39.03170)
USGS Quad: LOVE POINT Longitude: 76° 18.1' W ( -76.30170)
To reach the tidal bench marks from the Chesapeake Bay Bridge toll booths,
travel 8.2 km (5.1 mi) east on Route 301, then turn left onto State Road 18 and
proceed north for 6.4 km (4.0 mi), then turn right onto Pier Avenue and drive
0.5 km (0.3 mi) to the entrance to the Langenfelder Company. The bench marks
are located on the Langenfelder Company property. The staff and tide gage were
located on the old ferry slip.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2955 D 1995
DESIGNATION: 857 2955 D
MONUMENTATION: Tidal Station disk VM#: 13351
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 39° 1.9' N ( 39.03170) LONGITUDE: 76° 18.1' W ( -76.30170)
The primary bench mark is a disk set in a 10 m x 2 m (32 ft x 7 ft) concrete
foundation for a single gas pump, 16.06 m (52.7 ft) NW of the NW corner of the
concrete truck scale pad, 9.33 m (30.6 ft) north of the south edge of the
concrete pad containing both the bench mark and the gas pump, and 7.68 m (25.2
ft) WSW of the NW corner of the Langenfelder office.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8572955 PUBLICATION DATE: 04/18/2005
Name: LOVE POINT PIER, KENT ISLAND
MD
NOAA Chart: 12278 Latitude: 39° 1.9' N ( 39.03170)
USGS Quad: LOVE POINT Longitude: 76° 18.1' W ( -76.30170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 5 1971
DESIGNATION: TIDAL 5 STA 47
MONUMENTATION: Tidal Station disk VM#: 3085
AGENCY: National Ocean Survey (NOS) IDB PID#: JV0541
SETTING CLASSIFICATION: Concrete monument OPUS PID#: JV0541
LATITUDE: 39° 2.0' N ( 39.03330) LONGITUDE: 76° 18.3' W ( -76.30500)
The bench mark is a disk set flush in a concrete monument at ground level
located on the north side of the Langenfelder Company entrance road, 92.66 m
(304.0 ft) east of the entrance gate to the Langenfelder Company yard, 30.63 m
(100.5 ft) west of power pole #185, 28.13 m (92.3 ft) north of the north face of
the concrete sea wall on the south side of the yard, 15.24 m (50.0 ft) ESE of
power pole #184, and adjacent to an orange witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8572955 PUBLICATION DATE: 04/18/2005
Name: LOVE POINT PIER, KENT ISLAND
MD
NOAA Chart: 12278 Latitude: 39° 1.9' N ( 39.03170)
USGS Quad: LOVE POINT Longitude: 76° 18.1' W ( -76.30170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 6 1971
DESIGNATION: TIDAL 6 STA 47
MONUMENTATION: Tidal Station disk VM#: 3086
AGENCY: National Ocean Survey (NOS) IDB PID#: JV0540
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 39° 2.0' N ( 39.03330) LONGITUDE: 76° 18.3' W ( -76.30500)
The bench mark is a disk set in the western end of a concrete sea wall in the
front yard of a private lot on the south side of Pier Avenue, 27.10 m (88.9 ft)
south of power pole #128, 15 m (49.0 ft) ENE of the NE corner of the porch of
the house on the lot, just west of the chain link fence bordering the
Langenfelder Company property, and adjacent to an orange witness post.
BENCH MARK STAMPING: 2955 B 1983
DESIGNATION: 857 2955 B
MONUMENTATION: Tidal Station disk VM#: 3087
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 39° 1.9' N ( 39.03170) LONGITUDE: 76° 18.1' W ( -76.30170)
The bench mark is a disk located on north side of entrance road to the
Langenfelder Company property, 40.54 m (133.0 ft) NW of a SW chimney of a
two-story office, 34.29 m (112.5 ft) NW of gas pump near SW corner of office,
27.16 m (89.1 ft) NNW of the eastern-most telephone pole on the north side of
the entrance road, 23.04 m (75.6 ft) NNE of a shell paved access road, 5.79 m
(19.0 ft) NNE of the eastern-most tree of a line of trees along the north side
of the entrance road, and 0.12 m (0.4 ft) south of an orange witness post. The
bench mark is crimped to the top of a stainless steel rod driven 17.1 m (56 ft)
to refusal, and encased in a 4-inch PVC pipe with a PVC cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8572955 PUBLICATION DATE: 04/18/2005
Name: LOVE POINT PIER, KENT ISLAND
MD
NOAA Chart: 12278 Latitude: 39° 1.9' N ( 39.03170)
USGS Quad: LOVE POINT Longitude: 76° 18.1' W ( -76.30170)
T I D A L D A T U M S
Tidal datums at LOVE POINT PIER, KENT ISLAND based on:
LENGTH OF SERIES: 4 YEARS
TIME PERIOD: June 1996 - May 2000
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8574680 BALTIMORE, FORT MCHENRY, PATAPSCO RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/07/1996) = 1.306
MEAN HIGHER HIGH WATER MHHW = 0.514
MEAN HIGH WATER MHW = 0.427
MEAN SEA LEVEL MSL = 0.248
MEAN TIDE LEVEL MTL = 0.246
MEAN LOW WATER MLW = 0.065
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (04/01/1997) = -0.831
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2955 D 1995 1.543 1.116
NO 5 1971 1.679 1.252
NO 6 1971 1.086 0.659
2955 B 1983 1.596 1.169
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8572955 PUBLICATION DATE: 04/18/2005
Name: LOVE POINT PIER, KENT ISLAND
MD
NOAA Chart: 12278 Latitude: 39° 1.9' N ( 39.03170)
USGS Quad: LOVE POINT Longitude: 76° 18.1' W ( -76.30170)
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.