U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 11/21/2000
Station ID: 8743081 SUPERCEDED DATE: 04/21/2003
Name: HOLLINGSWORTH POINT, DAVIS BAYOU
MISSISSIPPI
NOAA Chart: 11373 Latitude: 30° 23.2' N
USGS Quad: OCEAN SPRINGS Longitude: 88° 46.4' W
To reach the tidal bench marks from the intersection of U.S. Highway 90 and
Hanshaw Road in Ocean Springs, proceed 1.4 km (0.9 mi) south on Hanshaw Road to
the intersection of Old Highway 90, then 0.2 km (0.1 mi) west on Old Highway 90
to the intersection of Beachview Drive, then 1.3 km (0.8 mi) south on Beachview
Drive to the intersection of Marina Drive, then 1.0 km (0.6 mi) west on Marina
Drive to the Kozluski residence at the end of a cul-de-sac. The bench marks are
located along Marina Drive east of the Kozluski residence. The tide gage and
staff were located at the NE corner of the Kozluski's private dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3081 A 1979
DESIGNATION: 874 3081 A
MONUMENTATION: Tidal Station disk VM#: 11578
AGENCY: National Ocean Survey (NOS) PID:
SETTING CLASSIFICATION: Stainless steel rod
The primary bench mark is a disk located near the Kozluski dock on Davis Bayou,
31.76 m (104.2 ft) WNW of the NW corner of the Kozluski carport, 28.65 m (94.0
ft) NNE of the bank of a canal, 12.04 m (39.5 ft) NE of the wooden dock, and
6.83 m (22.4 ft) SE of a wood bulkhead on Davis Bayou. The bench mark is set 9
cm (0.3 ft) below ground level, crimped to a stainless steel rod driven 13.7 m
(45 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 3081 B 1979
DESIGNATION: 874 3081 B
MONUMENTATION: Tidal Station disk VM#: 11579
AGENCY: National Ocean Survey (NOS) PID:
SETTING CLASSIFICATION: Concrete post
The bench mark is a disk set flush in a concrete post at the NE corner of #9728
Marina Drive, 64 m (210 ft) east of bench mark 3081 A 1979, 26.97 m (88.5 ft) NE
of the SE corner of the house, 14 m (46 ft) NW of the center of the cul-de-sac,
2.80 m (9.2 ft) NE of the centerline of a concrete driveway, 0.30 m (1.0 ft) WSW
of a power pole, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 11/21/2000
Station ID: 8743081 SUPERCEDED DATE: 04/21/2003
Name: HOLLINGSWORTH POINT, DAVIS BAYOU
MISSISSIPPI
NOAA Chart: 11373 Latitude: 30° 23.2' N
USGS Quad: OCEAN SPRINGS Longitude: 88° 46.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3081 C 1979
DESIGNATION: 874 3081 C
MONUMENTATION: Tidal Station disk VM#: 11580
AGENCY: National Ocean Survey (NOS) PID:
SETTING CLASSIFICATION: Concrete post
The bench mark is a disk set flush in a concrete post near the Bectel residence
on Marina Drive, 68 m (223 ft) east of bench mark 3081 B 1979, 15.48 (50.8 ft)
SE of the SE corner of the Bectel residence, 10.67 m (35.0 ft) east of the
centerline of the Bectel concrete driveway, 6 m (18 ft) north of the centerline
of Marina Drive, and at ground level.
BENCH MARK STAMPING: 3081 D 1979
DESIGNATION: 874 3081 D
MONUMENTATION: Tidal Station disk VM#: 11581
AGENCY: National Ocean Survey (NOS) PID:
SETTING CLASSIFICATION: Stainless steel rod
The bench mark is a disk located near the intersection of Marina Drive and
Magnolia Street, 64 m (210 ft) east of bench mark 3081 C 1979, 37.37 m (122.6
ft) SE of the SE corner of a brick house, 9.02 m (29.6 ft) NW of the
intersection, and 6 m (21 ft) west of the centerline of Magnolia Street. The
bench mark is set 9 cm (0.3 ft) below ground level, crimped to a stainless steel
rod driven 15.2 m (50 ft) to refusal, and encased in a 4-inch PVC pipe and
concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 11/21/2000
Station ID: 8743081 SUPERCEDED DATE: 04/21/2003
Name: HOLLINGSWORTH POINT, DAVIS BAYOU
MISSISSIPPI
NOAA Chart: 11373 Latitude: 30° 23.2' N
USGS Quad: OCEAN SPRINGS Longitude: 88° 46.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3081 E 1979
DESIGNATION: 874 3081 E
MONUMENTATION: Tidal Station disk VM#: 11582
AGENCY: National Ocean Survey (NOS) PID:
SETTING CLASSIFICATION: Stainless steel rod
The bench mark is a disk located on Marina Drive east of its intersection with
Magnolia Street, 62 m (205 ft) east of bench mark 3081 D 1979, 28.59 m (93.8 ft)
NE of the NE corner of a brick house, 12.50 m (41.0 ft) north of power pole #23,
and 6 m (21 ft) north of the centerline of Marina Drive. The bench mark is set
9 cm (0.3 ft) below ground level, crimped to a stainless steel rod driven 15.2 m
(50 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 11/21/2000
Station ID: 8743081 SUPERCEDED DATE: 04/21/2003
Name: HOLLINGSWORTH POINT, DAVIS BAYOU
MISSISSIPPI
NOAA Chart: 11373 Latitude: 30° 23.2' N
USGS Quad: OCEAN SPRINGS Longitude: 88° 46.4' W
T I D A L D A T U M S
Tidal datums at HOLLINGSWORTH POINT, DAVIS BAYOU based on:
LENGTH OF SERIES: 17 MONTHS
TIME PERIOD: July 1979 - November 1980
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8743735 BILOXI (CADET POINT), BILOXI BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (07/11/1979) = 1.841
MEAN HIGHER HIGH WATER MHHW = 0.555
MEAN HIGH WATER MHW = 0.521
MEAN TIDE LEVEL MTL = 0.279
MEAN SEA LEVEL MSL = 0.278
MEAN LOW WATER MLW = 0.038
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (03/02/1980) = -0.549
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
3081 A 1979 2.249 1.728
3081 B 1979 5.526 5.005
3081 C 1979 4.810 4.289
3081 D 1979 4.692 4.171
3081 E 1979 4.803 4.282
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 11/21/2000
Station ID: 8743081 SUPERCEDED DATE: 04/21/2003
Name: HOLLINGSWORTH POINT, DAVIS BAYOU
MISSISSIPPI
NOAA Chart: 11373 Latitude: 30° 23.2' N
USGS Quad: OCEAN SPRINGS Longitude: 88° 46.4' 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.