U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8725747 PUBLICATION DATE: 02/05/2004 Name: ENGLEWOOD, LEMON BAY FL NOAA Chart: 11425 Latitude: 26° 56.0' N ( 26.93330) USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W ( -82.35330) To reach the tidal bench marks from the junction of State Road 776 (South McCall Road) and State Road 775 (Placidia Road/Pine Street) in Englewood, proceed west on State Road 776 for 0.8 km (0.5 mi) to Beach Road, then turn left and proceed SW to the Tom Adams Bridge. The bench marks are in the vicinity of the bridge. The tide gage and staff were located west of the bridge tender's house. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1973 DESIGNATION: 872 5747 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 6048 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7835 SETTING CLASSIFICATION: Concrete culvert abutment OPUS PID: LATITUDE: 26° 56.0' N ( 26.93330) LONGITUDE: 82° 21.2' W ( -82.35330) The primary bench mark is a disk set in the top of a concrete culvert head wall, 59 m (195 ft) south of the south corner of the bridge, 9 m (30 ft) SE of the center line of the highway, 5 m (18 ft) south of the SW end of the bridge bulkhead, 3 m (10 ft) SSE of the Tom Adams Bridge Monument, 3 m (10 ft) SE of a manhole cover, and 0.3 m (1 ft) below the level of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8725747 PUBLICATION DATE: 02/05/2004 Name: ENGLEWOOD, LEMON BAY FL NOAA Chart: 11425 Latitude: 26° 56.0' N ( 26.93330) USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W ( -82.35330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: IWCH 21 1965 DESIGNATION: IWCH 21 MONUMENTATION: Survey disk VM#: 6047 AGENCY: US Army Corps of Engineers (USE) IDB PID#: AG7833 SETTING CLASSIFICATION: Sidewalk OPUS PID: LATITUDE: 26° 56.0' N ( 26.93397) LONGITUDE: 82° 21.2' W ( -82.35336) The bench mark is a disk set flush in the center of the sidewalk between the bridge guard rail and the concrete sidewalk rail on the SE side of the Tom Adams Bridge, 32 m (105 ft) SW of the drawbridge span, and 20 m (65 ft) NE of the SW traffic lift gate.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8725747 PUBLICATION DATE: 02/05/2004 Name: ENGLEWOOD, LEMON BAY FL NOAA Chart: 11425 Latitude: 26° 56.0' N ( 26.93330) USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W ( -82.35330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5747 B DESIGNATION: 872 5747 B TIDAL ALIAS: FLORIDA SRD (SEAWALL) MONUMENTATION: Survey disk VM#: 6051 AGENCY: Florida Department of Transportation (FLDOT) IDB PID#: AG7830 SETTING CLASSIFICATION: Concrete bulkhead OPUS PID: LATITUDE: 26° 56.1' N ( 26.93500) LONGITUDE: 82° 21.1' W ( -82.35170) The bench mark is a disk set in the top of a concrete bulkhead at the NE end of the Tom Adams Bridge, 6 m (20 ft) NW of the north corner of the bridge, 2 m (8 ft) below the bridge deck, and 0.15 m (0.5 ft) from the offshore edge of the bulkhead. NOTE: The bench mark is historically known as FLORIDA SRD (SEAWALL).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8725747 PUBLICATION DATE: 02/05/2004 Name: ENGLEWOOD, LEMON BAY FL NOAA Chart: 11425 Latitude: 26° 56.0' N ( 26.93330) USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W ( -82.35330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5747 C DESIGNATION: 872 5747 C TIDAL ALIAS: FLORIDA SRD (NW) MONUMENTATION: Survey disk VM#: 6052 AGENCY: Florida Department of Transportation (FLDOT) IDB PID#: AG7832 SETTING CLASSIFICATION: Concrete bridge curb OPUS PID: LATITUDE: 26° 56.1' N ( 26.93500) LONGITUDE: 82° 21.1' W ( -82.35170) The bench mark is a disk set flush in the top center of the 0.3 m (1 ft) high concrete bridge curb supporting a metal guardrail at the NW corner of the Tom Adams bridge, 4.11 m (13.5 ft) NW of the centerline of the highway, 9 m (30 ft) south of a concrete power pole, 3 m (10 ft) south of the north end of the abutment, 1 m (4 ft) SE of the concrete handrail, and 0.3 m (1 ft) SW of the seam at the NE end where the bridge meets the highway. NOTE: The bench mark is historically known as FLORIDA SRD (NW).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8725747 PUBLICATION DATE: 02/05/2004 Name: ENGLEWOOD, LEMON BAY FL NOAA Chart: 11425 Latitude: 26° 56.0' N ( 26.93330) USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W ( -82.35330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5747 D DESIGNATION: 872 5747 D TIDAL ALIAS: FLORIDA SRD (SW) MONUMENTATION: Survey disk VM#: 6053 AGENCY: Florida Department of Transportation (FLDOT) IDB PID#: AG7834 SETTING CLASSIFICATION: Concrete walkway curb OPUS PID: LATITUDE: 26° 56.0' N ( 26.93330) LONGITUDE: 82° 21.2' W ( -82.35330) The bench mark is a disk set flush in the top center of the SW concrete walkway curb on the Tom Adams bridge, 3 m (10 ft) NE of the SW bridge abutment, 1 m (4 ft) NW of a concrete handrail, and 0.3 m (1 ft) NE of the seam at the SW end of the bridge where it meets the highway. NOTE: The bench mark is historically known as FLORIDA SRD (SW).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8725747 PUBLICATION DATE: 02/05/2004 Name: ENGLEWOOD, LEMON BAY FL NOAA Chart: 11425 Latitude: 26° 56.0' N ( 26.93330) USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W ( -82.35330) T I D A L D A T U M S Tidal datums at ENGLEWOOD, LEMON BAY based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: March 1976 - February 1977 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8725110 NAPLES, GULF OF MEXICO Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (05/15/1976) = 0.918 MEAN HIGHER HIGH WATER MHHW = 0.478 North American Vertical Datum NAVD88 = 0.439 MEAN HIGH WATER MHW = 0.398 MEAN TIDE LEVEL MTL = 0.246 MEAN SEA LEVEL MSL = 0.244 MEAN LOW WATER MLW = 0.093 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/19/1977) = -0.377 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 1 1973 1.665 1.267 IWCH 21 1965 7.047 6.649 5747 B 1.341 0.943 5747 C 4.012 3.614 5747 D 3.932 3.534
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8725747 PUBLICATION DATE: 02/05/2004 Name: ENGLEWOOD, LEMON BAY FL NOAA Chart: 11425 Latitude: 26° 56.0' N ( 26.93330) USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W ( -82.35330) 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.