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.