U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8726685 PUBLICATION DATE: 04/01/2004 Name: TWENTY-SECOND ST. CAUSEWAY FL NOAA Chart: 11413 Latitude: 27° 56.3' N ( 27.93830) USGS Quad: TAMPA Longitude: 82° 25.9' W ( -82.43170) To reach the tidal bench marks from the intersection of U.S. Highway 41 Business and State Highway 60 in Tampa, proceed south on U.S. Highway 41 Business for 2.4 km (1.5 mi) to the 22nd Street Causeway Bridge over McKay Bay. The bench marks are on and in the vicinity of the north end of the 22nd Street Causeway. The tide gage and staff were located on a small offshore structure in McKay Bay, just east of bench mark 6685 A 1977. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 6685 A 1977 DESIGNATION: 872 6685 A TIDAL MONUMENTATION: Tidal Station disk VM#: 7493 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7499 SETTING CLASSIFICATION: Concrete bridge sea wall OPUS PID: LATITUDE: 27° 56.1' N ( 27.93500) LONGITUDE: 82° 26.0' W ( -82.43330) The primary bench mark is a disk set in the bridge sea wall, 18 m (58 ft) NE of the north corner of the northbound bridge, 0.40 m (1.3 ft) NW of the SE corner of the NE sea wall, and is 5 m (15 ft) below road level. BENCH MARK STAMPING: 6685 B 1977 DESIGNATION: 872 6685 B TIDAL MONUMENTATION: Tidal Station disk VM#: 7494 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7498 SETTING CLASSIFICATION: Concrete bridge sea wall OPUS PID: LATITUDE: 27° 56.1' N ( 27.93500) LONGITUDE: 82° 26.0' W ( -82.43330) The bench mark is a disk set in the top of the bridge sea wall located on the NE side of the road, 23 m (77 ft) NE of the centerline of the northbound lane, 0.27 m (0.9 ft) SE of the NW end of the sea wall, and 1 m (4 ft) below road level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8726685 PUBLICATION DATE: 04/01/2004 Name: TWENTY-SECOND ST. CAUSEWAY FL NOAA Chart: 11413 Latitude: 27° 56.3' N ( 27.93830) USGS Quad: TAMPA Longitude: 82° 25.9' W ( -82.43170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6685 C 1977 DESIGNATION: 872 6685 C TIDAL MONUMENTATION: Tidal Station disk VM#: 7495 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7497 SETTING CLASSIFICATION: Concrete culvert head wall OPUS PID: LATITUDE: 27° 56.2' N ( 27.93670) LONGITUDE: 82° 26.0' W ( -82.43330) The bench mark is a disk set flush in a concrete culvert head wall, 0.2 km (0.1 mi) north of the bridge, 11 m (36 ft) NE of the centerline of the northbound lane, 2 m (7 ft) NW of the SE end of the culvert head wall, 2 m (7 ft) SE of the NW end of the head wall, and is 1 m (2 ft) below road level. BENCH MARK STAMPING: 6685 D DESIGNATION: 872 6685 D TIDAL FLDT MONUMENTATION: Bench Mark disk VM#: 7496 AGENCY: Florida Department of Transportation (FLDOT) IDB PID#: AG7501 SETTING CLASSIFICATION: Concrete railing OPUS PID#: AG7501 LATITUDE: 27° 56.1' N ( 27.93500) LONGITUDE: 82° 26.0' W ( -82.43330) The bench mark is a disk set in the concrete bridge railing located on the NE corner of the northbound bridge, 6.86 m (22.5 ft) NE of the centerline of the northbound lane, 1.68 m (5.5 ft) SE of the NW end of the bridge rail, and 1 m (3 ft) above road level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8726685 PUBLICATION DATE: 04/01/2004 Name: TWENTY-SECOND ST. CAUSEWAY FL NOAA Chart: 11413 Latitude: 27° 56.3' N ( 27.93830) USGS Quad: TAMPA Longitude: 82° 25.9' W ( -82.43170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6685 E DESIGNATION: 872 6685 E TIDAL FLDT MONUMENTATION: Bench Mark disk VM#: 7497 AGENCY: Florida Department of Transportation (FLDOT) IDB PID#: AG7500 SETTING CLASSIFICATION: Concrete railing OPUS PID: LATITUDE: 27° 56.1' N ( 27.93500) LONGITUDE: 82° 26.0' W ( -82.43330) The bench mark is a disk set in the concrete bridge railing located on the NW corner of the southbound bridge, 6.86 m (22.5 ft) SW of the centerline of the southbound lane, 1.68 m (5.5 ft) SE of the NW end of the bridge rail, and is 1 m (3 ft) above road level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8726685 PUBLICATION DATE: 04/01/2004 Name: TWENTY-SECOND ST. CAUSEWAY FL NOAA Chart: 11413 Latitude: 27° 56.3' N ( 27.93830) USGS Quad: TAMPA Longitude: 82° 25.9' W ( -82.43170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MCKAY 1 1981 DESIGNATION: MCKAY 1 USE MONUMENTATION: Traverse Station disk VM#: 7498 AGENCY: US Army Corps of Engineers (USE) IDB PID#: AG7502 SETTING CLASSIFICATION: Concrete sidewalk OPUS PID: LATITUDE: 27° 56.0' N ( 27.93330) LONGITUDE: 82° 25.9' W ( -82.43170) The bench mark is a disk set in the concrete sidewalk of the northbound bridge located near the middle of the bridge, 251 m (823 ft) NW of the SE end of the bridge, 246 m (807 ft) SE of the NW end of the bridge, 15.45 m (50.7 ft) SE of the center of a ladder going down, 6.46 m (21.2 ft) SW of the northbound lane, 3.20 m (10.5 ft) NW of the center of the channel underneath the bridge, 0.64 m (2.1 ft) NE of the side of the concrete rail, and 0.15 m (0.5 ft) above road level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8726685 PUBLICATION DATE: 04/01/2004 Name: TWENTY-SECOND ST. CAUSEWAY FL NOAA Chart: 11413 Latitude: 27° 56.3' N ( 27.93830) USGS Quad: TAMPA Longitude: 82° 25.9' W ( -82.43170) T I D A L D A T U M S Tidal datums at TWENTY-SECOND ST. CAUSEWAY based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: September 1977 - November 1977 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8726520 ST. PETERSBURG, TAMPA BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.822 MEAN HIGH WATER MHW = 0.739 North American Vertical Datum NAVD88 = 0.519 MEAN SEA LEVEL MSL = 0.442 MEAN TIDE LEVEL MTL = 0.432 MEAN LOW WATER MLW = 0.126 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 6685 A 1977 1.464 0.725 6685 B 1977 1.476 0.737 6685 C 1977 1.546 0.807 6685 D 7.485 6.746 6685 E 7.414 6.675 MCKAY 1 1981 14.691 13.952
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8726685 PUBLICATION DATE: 04/01/2004 Name: TWENTY-SECOND ST. CAUSEWAY FL NOAA Chart: 11413 Latitude: 27° 56.3' N ( 27.93830) USGS Quad: TAMPA Longitude: 82° 25.9' W ( -82.43170) 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.