U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8726045 PUBLICATION DATE: 09/26/2003
Name: HAYDEN ROBERTS BAY
FL
NOAA Chart: 11424 Latitude: 27° 17.5' N ( 27.29170)
USGS Quad: SARASOTA Longitude: 82° 32.5' W ( -82.54170)
To reach the tidal bench marks from the intersection of U.S. Highway 41 (South
Tamiami Trail) and State Highway 72, proceed north on U.S. Highway 41 for 3.8 km
(2.4 mi) to the junction of Kenilworth Street, then turn left and proceed west
on Kenilworth Street for 0.8 km (0.5 mi) to the Reagle Lagoon Boat Basin. The
bench marks are located on the seawall surrounding the boat basin. The tide gage
and staff were located at the west end of a wooden dock SW of Bench Mark 6045 B
1977.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6045 A 1977
DESIGNATION: 872 6045 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 6112
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7742
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 27° 17.6' N ( 27.29330) LONGITUDE: 82° 32.3' W ( -82.53830)
The primary bench mark is a disk set flush in the top of the concrete sea wall,
8.78 m (28.8 ft) west of the SW corner of a guest house (former boat house), 6 m
(19 ft) west of the end of the slip, 1.80 m (5.9 ft) NE of the NW corner of a
boat hoist, 0.21 m (0.7 ft) east of the west edge of the seawall, and 0.21 m
(0.7 ft) under a wood deck next to iron rail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8726045 PUBLICATION DATE: 09/26/2003
Name: HAYDEN ROBERTS BAY
FL
NOAA Chart: 11424 Latitude: 27° 17.5' N ( 27.29170)
USGS Quad: SARASOTA Longitude: 82° 32.5' W ( -82.54170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6045 B 1977
DESIGNATION: 872 6045 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 6113
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7741
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 27° 17.6' N ( 27.29330) LONGITUDE: 82° 32.3' W ( -82.53830)
The bench mark is a disk set flush in the top of the concrete sea wall, 9 m (30
ft) SW of the SW corner of a guest house (former boat house), 5.39 m (17.7 ft)
west of the end of the slip, 3.66 m (12.0 ft) south of Bench Mark 6045 A 1977,
and 0.18 m (0.6 ft) east of the west edge of the seawall, and 0.21 m (0.7 ft)
under a wood deck next to iron rail.
BENCH MARK STAMPING: 6045 C 1977
DESIGNATION: 872 6045 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 6114
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7740
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 27° 17.6' N ( 27.29330) LONGITUDE: 82° 32.3' W ( -82.53830)
The bench mark is a disk set flush in the top of the concrete sea wall, 45.72 m
(150.0 ft) east of bench mark 6045 B 1977, 21.64 m (71.0 ft) SW of the end of a
drive, 18.64 m (61.8 ft) SE of the SE corner of a guest house (former boat
house), and 0.15 m (0.5 ft) north of the south edge of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8726045 PUBLICATION DATE: 09/26/2003
Name: HAYDEN ROBERTS BAY
FL
NOAA Chart: 11424 Latitude: 27° 17.5' N ( 27.29170)
USGS Quad: SARASOTA Longitude: 82° 32.5' W ( -82.54170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6045 E 1977
DESIGNATION: 872 6045 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 6115
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7739
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 27° 17.6' N ( 27.29330) LONGITUDE: 82° 32.3' W ( -82.53830)
The bench mark is a disk set flush in the top of the sea wall, 31.70 m (104.0
ft) east of bench mark 6045 C 1977, 21.55 m (70.7 ft) SW of a power pole, 5 m
(16 ft) south of the centerline of a drive, and 0.12 m (0.4 ft) north of the
south edge of the seawall. NOTE: Crawl under foot bridge to sea wall corner
station.
BENCH MARK STAMPING: 6045 F 1977
DESIGNATION: 872 6045 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 6116
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7738
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 27° 17.6' N ( 27.29330) LONGITUDE: 82° 32.3' W ( -82.53830)
The bench mark is a disk set flush in the top of the sea wall, 28 m (92 ft) east
of bench mark 6045 E 1977, 11.58 m (38.0 ft) SE of power pole #1321, 5.49 m
(18.0 ft) south of the centerline of the drive, and 0.15 m (0.5 ft) north of the
south edge of the seawall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8726045 PUBLICATION DATE: 09/26/2003
Name: HAYDEN ROBERTS BAY
FL
NOAA Chart: 11424 Latitude: 27° 17.5' N ( 27.29170)
USGS Quad: SARASOTA Longitude: 82° 32.5' W ( -82.54170)
T I D A L D A T U M S
Tidal datums at HAYDEN ROBERTS BAY based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: June 1977 - July 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8726247 BRADENTON MANATEE RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.621
MEAN HIGH WATER MHW = 0.540
North American Vertical Datum NAVD88 = 0.445
MEAN SEA LEVEL MSL = 0.319
MEAN TIDE LEVEL MTL = 0.316
MEAN LOW WATER MLW = 0.091
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6045 A 1977 1.492 0.952
6045 B 1977 1.474 0.934
6045 C 1977 1.212 0.672
6045 E 1977 1.191 0.651
6045 F 1977 1.144 0.604
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8726045 PUBLICATION DATE: 09/26/2003
Name: HAYDEN ROBERTS BAY
FL
NOAA Chart: 11424 Latitude: 27° 17.5' N ( 27.29170)
USGS Quad: SARASOTA Longitude: 82° 32.5' W ( -82.54170)
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.