U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 11/05/1984
Station ID: 8726996 SUPERCEDED DATE: 04/21/2003
Name: NEW PORT RICHEY, CROSS BAYOU
FLORIDA
NOAA Chart: 11409 Latitude: 28° 14.8' N
USGS Quad: ELFERS Longitude: 82° 44.1' W
To reach the tidal bench marks proceed west then south along West Main Street
from the intersection of West Main Street and U.S. Highway 19 in New Port
Richey, then from the intersection of West South Road (Illinois Avenue) and U.S.
Highway 19 proceed west along West South Road to the New Port Richey Lindrick
Service Corporation water treatment plant. Most bench marks are on the water
treatment plant property, and the gage and staff were at the Lindrick Service
Corporation water treatment plant.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6996 B 1976
MONUMENTATION: Survey Disk VM#: 7696
AGENCY: PID#: AL7444
SETTING CLASSIFICATION: Concrete Decking
The bench mark is at the New Port Richey water treatment plant, on the west side
of a pumping station, north of a rectangular setting tank and south of a
circular tank, 200 feet (61 m) SE of Bench Mark 6996 D 1976, 10.5 feet (3.2 m)
south of the NW corner and 9.5 feet (2.9 m) north of the SW corner of the
pumping station building, and is set into the concrete decking.
BENCH MARK STAMPING: 6996 A 1976
MONUMENTATION: Survey Disk VM#: 7695
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is at the Lindrick Service Corporation Water Treatment Plant,
39.2 feet (11.9 m) west of the wing wall that projects from the south side of
the water treatment tank and 2.6 feet (0.8 m) SE of the SW corner of the tank,
and is set flush into the concrete corner of the tank.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 11/05/1984
Station ID: 8726996 SUPERCEDED DATE: 04/21/2003
Name: NEW PORT RICHEY, CROSS BAYOU
FLORIDA
NOAA Chart: 11409 Latitude: 28° 14.8' N
USGS Quad: ELFERS Longitude: 82° 44.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6996 C 1976
MONUMENTATION: Survey Disk VM#: 7697
AGENCY: PID:
SETTING CLASSIFICATION: Copper-coated Steel Rod
The bench mark is at the New Port Richey water treatment plant, 170 feet (51.8
m) SW of Bench Mark 6996 B 1976, 66 feet (20 m) south of the SE corner of the
most western of two setting tanks and 1.8 feet (0.5 m) south of a fence. The
bench mark is crimped to a 5/8 inch diameter copper-coated steel rod driven to
refusal, and encased in a PVC protector pipe and concrete, at ground level.
BENCH MARK STAMPING: 6996 D 1976
MONUMENTATION: Survey Disk VM#: 7698
AGENCY: PID#: AL7443
SETTING CLASSIFICATION: Concrete Tank Foundation
The bench mark is at the New Port Richey water treatment plant, 104 feet (31.7
m) SSE of Bench Mark 6996 E 1976 and 41 feet (12.5 m) east of the north-south
fence on the west side of the property, and is set flush into the west side of
the most northerly of four circular tanks on a north-south line.
BENCH MARK STAMPING: 6996 E 1976
MONUMENTATION: Survey Disk VM#: 7699
AGENCY: PID#: AL7445
SETTING CLASSIFICATION: Concrete Garage Deck
The bench mark is at the New Port Richey water treatment plant, 78.0 feet (23.8
m) SW of Bench Mark 6996 F 1976, 48.0 feet (14.6 M) west of the SW corner of the
main office and control building and 1.0 foot (0.3 m) south of the SE corner of
the garage, and is set flush into the concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 11/05/1984
Station ID: 8726996 SUPERCEDED DATE: 04/21/2003
Name: NEW PORT RICHEY, CROSS BAYOU
FLORIDA
NOAA Chart: 11409 Latitude: 28° 14.8' N
USGS Quad: ELFERS Longitude: 82° 44.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6996 F 1976
MONUMENTATION: Survey Disk VM#: 7700
AGENCY: PID#: AL7442
SETTING CLASSIFICATION: Copper-coated Steel Rod
The bench mark is at the New Port Richey water treatment plant, 65.4 feet (19.9
m) NW of the NW corner of the main office and control building and 1.6 feet (0.5
m) south of the east-west fence west of the main gate. The bench mark is
crimped to a 5/8 inch diameter copper-coated steel rod driven to refusal, and
encased in a PVC pipe and concrete, at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 11/05/1984
Station ID: 8726996 SUPERCEDED DATE: 04/21/2003
Name: NEW PORT RICHEY, CROSS BAYOU
FLORIDA
NOAA Chart: 11409 Latitude: 28° 14.8' N
USGS Quad: ELFERS Longitude: 82° 44.1' W
T I D A L D A T U M S
Tidal datums at NEW PORT RICHEY, CROSS BAYOU based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: MARCH 1976
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8726924 ANCLOTE, ANCLOTE RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (04/11/1976) = 5.02
MEAN HIGHER HIGH WATER MHHW = 3.40
MEAN HIGH WATER MHW = 2.98
MEAN TIDE LEVEL MTL = 1.77
MEAN LOW WATER MLW = 0.56
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (02/26/1976) = -0.85
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
6996 B 1976 9.08 6.10
6996 A 1976 7.63 4.65
6996 C 1976 8.54 5.56
6996 D 1976 10.93 7.95
6996 E 1976 9.23 6.25
6996 F 1976 8.26 5.28
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 11/05/1984
Station ID: 8726996 SUPERCEDED DATE: 04/21/2003
Name: NEW PORT RICHEY, CROSS BAYOU
FLORIDA
NOAA Chart: 11409 Latitude: 28° 14.8' N
USGS Quad: ELFERS Longitude: 82° 44.1' 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.