U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8727001 PUBLICATION DATE: 04/01/2004
Name: MIDDLE PITHLACHASCOTEE RIVER
FL
NOAA Chart: 11409 Latitude: 28° 14.9' N ( 28.24830)
USGS Quad: ELFERS Longitude: 82° 43.4' W ( -82.72330)
To reach the tidal bench marks from the intersection of U.S. Highway 19 and Main
Street in New Port Richey, proceed east on Main Stree for 0.40 km (0.25 mi) to
South River Road, then turn right and proceed south on South River Road for 0.24
km (0.15 mi) to 410 South River Road. The bench marks are located in the area
around the concrete bridge. The tide gage and staff were located on a private
pier behind the residence at 410 South River Road.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7001 A 1976
DESIGNATION: 872 7001 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 7701
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7450
SETTING CLASSIFICATION: Concrete step OPUS PID#: AL7450
LATITUDE: 28° 14.9' N ( 28.24830) LONGITUDE: 82° 43.4' W ( -82.72330)
The primary bench mark is a disk set in the top of the first concrete step of
the First Church of Christian Scientist, 16.96 m (55.6 ft) west of the
centerline of South River Road, 11 m (35 ft) NE of the SE corner of the church,
and 6 m (20 ft) east of the east wall of the church.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8727001 PUBLICATION DATE: 04/01/2004
Name: MIDDLE PITHLACHASCOTEE RIVER
FL
NOAA Chart: 11409 Latitude: 28° 14.9' N ( 28.24830)
USGS Quad: ELFERS Longitude: 82° 43.4' W ( -82.72330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7001 B 1976
DESIGNATION: 872 7001 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 7702
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7449
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 28° 15.0' N ( 28.25000) LONGITUDE: 82° 43.4' W ( -82.72330)
The bench mark is a disk located 30 m (99 ft) north of the curve of Main Street,
17 m (57 ft) west of the NW corner of the Chamber of Commerce building, 7.80 m
(25.6 ft) east of the centerline of North River Road and 1.68 m (5.5 ft) NE of a
powerline pole. The bench mark is 0.18 m (0.6 ft) below ground level, crimped
to a copper-clad steel rod driven 15.2 m (50 ft) to refusal, and encased in a
PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7001 C 1976
DESIGNATION: 872 7001 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 7703
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7448
SETTING CLASSIFICATION: Concrete slab OPUS PID:
LATITUDE: 28° 15.0' N ( 28.25000) LONGITUDE: 82° 43.4' W ( -82.72330)
The bench mark is a disk set in the top of a concrete slab, 41.45 m (136.0 ft)
NNE of bench mark 7001 B 1976, 32.31 m (106.0 ft) NNW of NE corner of the
Chamber of Commerce building, 20.27 m (66.5 ft) east of the centerline of North
River Road, 0.55 m (1.8 ft) north of the south end of the slab and 0.43 m (1.4
ft) west of the east side of the slab.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8727001 PUBLICATION DATE: 04/01/2004
Name: MIDDLE PITHLACHASCOTEE RIVER
FL
NOAA Chart: 11409 Latitude: 28° 14.9' N ( 28.24830)
USGS Quad: ELFERS Longitude: 82° 43.4' W ( -82.72330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7001 E
DESIGNATION: 872 7001 E TIDAL FLDT
ALIAS: UNSTAMPED 1
MONUMENTATION: Survey disk VM#: 7704
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AL7447
SETTING CLASSIFICATION: Concrete abutment OPUS PID:
LATITUDE: 28° 15.0' N ( 28.25000) LONGITUDE: 82° 43.4' W ( -82.72330)
The bench mark is a disk set in the east abutment at the NE corner of the Main
Street bridge over the Pithlachascotee River, 10.21 m (33.5 ft) north of the
centerline of Main Street, and 0.46 m (1.5 ft) SW of the NE corner of the
bridge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8727001 PUBLICATION DATE: 04/01/2004
Name: MIDDLE PITHLACHASCOTEE RIVER
FL
NOAA Chart: 11409 Latitude: 28° 14.9' N ( 28.24830)
USGS Quad: ELFERS Longitude: 82° 43.4' W ( -82.72330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7001 D
DESIGNATION: 872 7001 D TIDAL FLDT
ALIAS: UNSTAMPED 2
MONUMENTATION: Survey disk VM#: 7705
AGENCY: Florida State Road Department (FLSRD) IDB PID#: AL7446
SETTING CLASSIFICATION: Concrete abutment OPUS PID:
LATITUDE: 28° 14.9' N ( 28.24830) LONGITUDE: 82° 43.4' W ( -82.72330)
The bench mark is a disk set in the west abutment at the SW corner of the Main
Street bridge over the Pithlachascotee River, 10.21 m (33.5 ft) south of the
centerline of West Main Street, and 0.46 m (1.5 ft) NE of the SW corner of the
bridge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8727001 PUBLICATION DATE: 04/01/2004
Name: MIDDLE PITHLACHASCOTEE RIVER
FL
NOAA Chart: 11409 Latitude: 28° 14.9' N ( 28.24830)
USGS Quad: ELFERS Longitude: 82° 43.4' W ( -82.72330)
T I D A L D A T U M S
Tidal datums at MIDDLE PITHLACHASCOTEE RIVER based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: March 1976 - March 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8726724 CLEARWATER BEACH, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.016
MEAN HIGH WATER MHW = 0.898
North American Vertical Datum NAVD88 = 0.609
MEAN TIDE LEVEL MTL = 0.530
MEAN SEA LEVEL MSL = 0.524
MEAN LOW WATER MLW = 0.162
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7001 A 1976 3.995 3.097
7001 B 1976 2.743 1.845
7001 C 1976 2.473 1.575
7001 E 4.433 3.535
7001 D 4.384 3.486
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8727001 PUBLICATION DATE: 04/01/2004
Name: MIDDLE PITHLACHASCOTEE RIVER
FL
NOAA Chart: 11409 Latitude: 28° 14.9' N ( 28.24830)
USGS Quad: ELFERS Longitude: 82° 43.4' W ( -82.72330)
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.