U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8726908 PUBLICATION DATE: 01/06/2004
Name: NORTH FORK, ANCLOTE RIVER
FL
NOAA Chart: 11412 Latitude: 28° 9.5' N ( 28.15830)
USGS Quad: TARPON SPRINGS Longitude: 82° 45.4' W ( -82.75670)
To reach the tidal bench marks from the City Hall at Tarpon Springs, proceed 1.3
km (0.8 mi) north along North Pinellas Avenue (U.S. Alt. Highway 19). The bench
marks are along U.S. Alt. Highway 19. The tide gage and staff were on the wing
wall at the NE corner of the U.S. Alt. Highway 19 bridge over the Anclote River.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1975
DESIGNATION: 872 6908 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 7656
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7468
SETTING CLASSIFICATION: Concrete abutment OPUS PID:
LATITUDE: 28° 9.5' N ( 28.15830) LONGITUDE: 82° 45.4' W ( -82.75670)
The primary bench mark is a disk set in top of the concrete abutment located at
the NE corner of the U.S. Alt. Highway 19 bridge over the Anclote River, and
6.34 m (20.8 ft) east of the centerline of the highway.
BENCH MARK STAMPING: NO 2 1975
DESIGNATION: 872 6908 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 7657
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7467
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 28° 9.5' N ( 28.15830) LONGITUDE: 82° 45.4' W ( -82.75670)
The bench mark is a disk located north of the north end of the U.S. Highway 19A
bridge over the Anclote River, 62 m (202 ft) north of bench mark No 1 1975, 6.95
m (22.8 ft) east of the centerline of the highway, and 1 m (2 ft) south of a
utility pole #12A-4331R with a witness sign. The bench mark is set 9 cm (0.3
ft) above ground level, crimped to the top of a copper-clad steel rod driven an
unspecified depth to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8726908 PUBLICATION DATE: 01/06/2004
Name: NORTH FORK, ANCLOTE RIVER
FL
NOAA Chart: 11412 Latitude: 28° 9.5' N ( 28.15830)
USGS Quad: TARPON SPRINGS Longitude: 82° 45.4' W ( -82.75670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PINCO K
DESIGNATION: PINCO K
MONUMENTATION: Survey disk VM#: 7658
AGENCY: Pinellas County Florida IDB PID#: AL0301
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 28° 9.8' N ( 28.16330) LONGITUDE: 82° 45.4' W ( -82.75670)
The bench mark is a disk set into the top of a concrete monument located at the
north corner of the intersection of U.S. Highway 19A and Rainville Road, 1.9 km
(1.2 mi) NNE of Tarpon Springs along U.S. Highway 19A, 17 m (55 ft) north of
utility pole No 12A5311R, 12 m (38 ft) west of the centerline of U.S. Highway
19A, 11 m (35 ft) north of the centerline of Rainville Road, 7 m (24 ft) west of
utility pole No. 2112, and 7m (23 ft) SW of the NW corner of a concrete
headwall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8726908 PUBLICATION DATE: 01/06/2004
Name: NORTH FORK, ANCLOTE RIVER
FL
NOAA Chart: 11412 Latitude: 28° 9.5' N ( 28.15830)
USGS Quad: TARPON SPRINGS Longitude: 82° 45.4' W ( -82.75670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Y 145 RESET 1957
DESIGNATION: Y 145 RESET
MONUMENTATION: Bench Mark disk VM#: 7659
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AL6624
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 28° 9.8' N ( 28.16330) LONGITUDE: 82° 45.4' W ( -82.75670)
The bench mark is a disk set in the top of a concrete monument located near the
south end of a 45 degree curve in U.S. Alt. Highway 19, 0.8 km (0.5 mi) north of
the bridge over the Anclote River, 32 m (105 ft) north of powerline pole #C-135,
22 m (72 ft) south of the centerline of a private drive leading west, 15 m (50
ft), west of the extended centerline of the highway, 25 m (83 ft) south of a
powerline, 0.3 m (1 ft) west of a witness post, and 0.15 m (0.5 ft) above ground
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8726908 PUBLICATION DATE: 01/06/2004
Name: NORTH FORK, ANCLOTE RIVER
FL
NOAA Chart: 11412 Latitude: 28° 9.5' N ( 28.15830)
USGS Quad: TARPON SPRINGS Longitude: 82° 45.4' W ( -82.75670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Y 146 2 1956
DESIGNATION: Y 146 2
MONUMENTATION: Bench Mark disk VM#: 7660
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AL0402
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 28° 9.4' N ( 28.15670) LONGITUDE: 82° 45.4' W ( -82.75670)
The bench mark is a disk set in the top of the concrete curb located at the SE
corner of the U.S. Alt. Highway 19 bridge over the Anclote River, 4.42 m (14.5
ft) east of the centerline of the highway, and 1 m (3 ft), north of the south
end of the bridge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8726908 PUBLICATION DATE: 01/06/2004
Name: NORTH FORK, ANCLOTE RIVER
FL
NOAA Chart: 11412 Latitude: 28° 9.5' N ( 28.15830)
USGS Quad: TARPON SPRINGS Longitude: 82° 45.4' W ( -82.75670)
T I D A L D A T U M S
Tidal datums at NORTH FORK, ANCLOTE RIVER based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: January 1976 - January 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8726924 ANCLOTE RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.824
MEAN HIGH WATER MHW = 0.722
North American Vertical Datum NAVD88 = 0.506
MEAN SEA LEVEL MSL = 0.439
MEAN TIDE LEVEL MTL = 0.429
MEAN LOW WATER MLW = 0.136
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 1 1975 4.715 3.993
NO 2 1975 3.751 3.029
PINCO K 1.199 0.477
Y 145 RESET 1957 1.548 0.826
Y 146 2 1956 5.054 4.332
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8726908 PUBLICATION DATE: 01/06/2004
Name: NORTH FORK, ANCLOTE RIVER
FL
NOAA Chart: 11412 Latitude: 28° 9.5' N ( 28.15830)
USGS Quad: TARPON SPRINGS Longitude: 82° 45.4' W ( -82.75670)
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.