U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8726711 PUBLICATION DATE: 04/29/2004 Name: WEST TAMPA, HILLSBOROUGH RIVER FL NOAA Chart: 11413 Latitude: 27° 57.6' N ( 27.96000) USGS Quad: TAMPA Longitude: 82° 28.1' W ( -82.46830) To reach the tidal bench marks from the intersection of Oregon Avenue and Willow Drive in Tampa, proceed south on Willow Drive to River Heights Marine and Dry Dock (2305 North Willow Drive). The bench marks are in the vicinity of the marina. The tide gage and staff were located on the northernmost dock of the marina. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 6711 A 1976 DESIGNATION: 872 6711 A TIDAL MONUMENTATION: Tidal Station disk VM#: 7530 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7451 SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: AG7451 LATITUDE: 27° 57.6' N ( 27.96000) LONGITUDE: 82° 28.1' W ( -82.46830) The primary bench mark is a disk set flush in the concrete sea wall, 51 m (167 ft) north of the centerline of the boat ramp, 11 m (35 ft) east of the centerline of the parking lot driveway, and 8 m (25 ft) north of the west end of the center pier. BENCH MARK STAMPING: 6711 B 1976 DESIGNATION: 872 6711 B TIDAL MONUMENTATION: Tidal Station disk VM#: 7531 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7452 SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: AG7452 LATITUDE: 27° 57.6' N ( 27.96000) LONGITUDE: 82° 28.1' W ( -82.46830) The bench mark is a disk set in the concrete sea wall, 48 m (156 ft) south of bench mark 6711 A 1976, 11.46 m (37.6 ft) NE of the NE corner of the washroom, 11.40 m (37.4 ft) NE of bench mark 6711 F 1976, 3.35 m (11.0 ft) north of the centerline of the boat ramp, and 1 m (3 ft) above the boat ramp.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8726711 PUBLICATION DATE: 04/29/2004 Name: WEST TAMPA, HILLSBOROUGH RIVER FL NOAA Chart: 11413 Latitude: 27° 57.6' N ( 27.96000) USGS Quad: TAMPA Longitude: 82° 28.1' W ( -82.46830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6711 C 1976 DESIGNATION: 872 6711 C TIDAL MONUMENTATION: Tidal Station disk VM#: 7532 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7454 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 27° 57.6' N ( 27.96000) LONGITUDE: 82° 28.1' W ( -82.46830) The bench mark is a disk set in the top of the north sea wall for the dry dock ramp, 23 m (77 ft) east of the east side of the dry dock building, 16 m (51 ft) WSW of bench mark 6711 E 1976, and 1 m (3 ft) above the ramp. BENCH MARK STAMPING: 6711 E 1976 DESIGNATION: 872 6711 E TIDAL MONUMENTATION: Tidal Station disk VM#: 7533 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7455 SETTING CLASSIFICATION: Concrete sign base OPUS PID: LATITUDE: 27° 57.6' N ( 27.96000) LONGITUDE: 82° 28.1' W ( -82.46830) The bench mark is a disk set in the base for a concrete sign, 29.41 m (96.5 ft) SSW from bench mark 6711 F 1976, 29 m (95 ft) SSE of the NE corner of the washroom, 5 m (18 ft) north of the north edge of the dry dock ramp, and 0.3 m (1 ft) NE of a Super 5 Gas sign.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8726711 PUBLICATION DATE: 04/29/2004 Name: WEST TAMPA, HILLSBOROUGH RIVER FL NOAA Chart: 11413 Latitude: 27° 57.6' N ( 27.96000) USGS Quad: TAMPA Longitude: 82° 28.1' W ( -82.46830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6711 F 1976 DESIGNATION: 872 6711 F TIDAL MONUMENTATION: Tidal Station disk VM#: 7534 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7453 SETTING CLASSIFICATION: Concrete walkway OPUS PID: LATITUDE: 27° 57.6' N ( 27.96000) LONGITUDE: 82° 28.1' W ( -82.46830) The bench mark is a disk set in the concrete walkway, 5 m (17 ft) south of the centerline of the boat ramp, 0.76 m (2.5 ft) north of the NE corner of the washroom, and 1 m (2 ft) above the boat ramp.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8726711 PUBLICATION DATE: 04/29/2004 Name: WEST TAMPA, HILLSBOROUGH RIVER FL NOAA Chart: 11413 Latitude: 27° 57.6' N ( 27.96000) USGS Quad: TAMPA Longitude: 82° 28.1' W ( -82.46830) T I D A L D A T U M S Tidal datums at WEST TAMPA, HILLSBOROUGH RIVER based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: December 1976 - January 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 = 0.786 MEAN HIGH WATER MHW = 0.711 North American Vertical Datum NAVD88 = 0.500 MEAN SEA LEVEL MSL = 0.415 MEAN TIDE LEVEL MTL = 0.409 MEAN LOW WATER MLW = 0.107 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 6711 A 1976 1.521 0.810 6711 B 1976 1.572 0.861 6711 C 1976 1.865 1.154 6711 E 1976 1.936 1.225 6711 F 1976 1.645 0.934
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8726711 PUBLICATION DATE: 04/29/2004 Name: WEST TAMPA, HILLSBOROUGH RIVER FL NOAA Chart: 11413 Latitude: 27° 57.6' N ( 27.96000) USGS Quad: TAMPA Longitude: 82° 28.1' W ( -82.46830) 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.