U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8726428 PUBLICATION DATE: 06/16/2004 Name: TIERRA VERDE FL NOAA Chart: 11414 Latitude: 27° 41.3' N ( 27.68830) USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 43.1' W ( -82.71830) To reach the tidal bench marks from the post office in St. Petersburg at the intersection of 1st Avenue North and 4th Street, Travel west along 1st Avenue north for 4.0 km (2.5 mi) to 34th Street (U.S. Route 19), travel south 5.8 km (3.6 mi) along U.S. Route 19, then 3.7 km (2.3 mi) west along the Pinellas Bayway (State Route 693), then 2.3 km (1.45 mi) south along the Pinellas Bayway across the Pinellas Bayway Bridge. The gage was at the south side of the bridge at the seawall at the end of 1st Avenue East, and the bench marks are along the Pinellas Bayway and 1st Avenue East near the south end of the bridge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 6428 C 1976 DESIGNATION: 872 6428 C TIDAL MONUMENTATION: Tidal Station disk VM#: 12129 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7403 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: AG7403 LATITUDE: 27° 41.5' N ( 27.69170) LONGITUDE: 82° 43.2' W ( -82.72000) The primary bench mark is a disk located 9 m (29 ft) east of the centerline of the Pinellas Bayway southbound lane, 8.75 m (28.7 ft) WNW of the south end of the first median south of the bridge over the main channel, and 8 m (27 ft) south of the south end of the center island. The bench mark is set on top of a copper-clad steel rod driven 12.2 m (40 ft) to refusal, and encased in a PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8726428 PUBLICATION DATE: 06/16/2004 Name: TIERRA VERDE FL NOAA Chart: 11414 Latitude: 27° 41.3' N ( 27.68830) USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 43.1' W ( -82.71830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6428 E 1976 DESIGNATION: 872 6428 E TIDAL MONUMENTATION: Tidal Station disk VM#: 12130 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7404 SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 27° 41.5' N ( 27.69170) LONGITUDE: 82° 43.2' W ( -82.72000) The bench mark is a disk set in the NE corner of the concrete pad for the Tierra Verde Shopping Center, 41.0 m (134.5 ft) SW of bench mark 6428 C 1976, 21 m (68 ft) west of the centerline of the southbound lane of the Pinellas Bayway, 13.4 m (44 ft) north of the centerline of the westbound lane of Madonna Boulevard, and 0.61 m (2.0 ft) above the road level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8726428 PUBLICATION DATE: 06/16/2004 Name: TIERRA VERDE FL NOAA Chart: 11414 Latitude: 27° 41.3' N ( 27.68830) USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 43.1' W ( -82.71830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: N 17 DESIGNATION: N 17 MONUMENTATION: Survey disk VM#: 12131 AGENCY: Florida Highway Division (FLHD) IDB PID#: AG5266 SETTING CLASSIFICATION: Concrete base OPUS PID: LATITUDE: 27° 41.5' N ( 27.69170) LONGITUDE: 82° 43.1' W ( -82.71830) The bench mark is a disk set in the top of the concrete base for a metal guardrail that borders the west edge of the walkway located on the east side of a concrete highway drawbridge, 8 m (26 ft) north of the south end of the concrete base, 1.34 m (4.4 ft) west of the east concrete guardrail on the bridge, 0.15 m (0.5 ft) west of the metal guardrail, and 0.3 m (1 ft) above the highway level. BENCH MARK STAMPING: 6428 F 1990 DESIGNATION: 872 6428 F TIDAL MONUMENTATION: Flange-encased Rod VM#: 12132 AGENCY: National Ocean Service (NOS) IDB PID#: AG9423 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 27° 41.5' N ( 27.69170) LONGITUDE: 82° 43.2' W ( -82.72000) The bench mark is a flange-encased rod located at the Tierra Verde Marina, 30 m (98 ft) NE of the NE corner of the dockmasters office, 5 m (16 ft) SW of a wooden light pole, 1 m (2 ft) south of a black chain link fence, and 0.18 m (0.6 ft) SE of the carsonite witness post. The bench mark being the top of a stainless steel rod driven 16.5 m (54 ft) to refusal encased in a NOS logo cap, stamped 6428 F 1990, and attached to a PVC pipe surrounded by concrete flush with the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8726428 PUBLICATION DATE: 06/16/2004 Name: TIERRA VERDE FL NOAA Chart: 11414 Latitude: 27° 41.3' N ( 27.68830) USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 43.1' W ( -82.71830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6428 G 1990 DESIGNATION: 872 6428 G TIDAL MONUMENTATION: Flange-encased Rod VM#: 12133 AGENCY: National Ocean Service (NOS) IDB PID#: AG9425 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 27° 41.3' N ( 27.68830) LONGITUDE: 82° 43.3' W ( -82.72170) The bench mark is located 218 m (715 ft) south of 6428 E 1976, 17 m (55 ft) SW of power pole 135335, 14 m (45 ft) west of the centerline of St. Road 693, 5 m (15 ft) east of a seawall, and 4 m (12 ft) south of the carsonite witness post. The bench mark is the top of a stainless steel rod driven 16 m (54 ft) to refusal encased in a NOS logo cap, stamped 6428 G 1990, and attached to a PVC pipe surrounded by concrete flush with the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8726428 PUBLICATION DATE: 06/16/2004 Name: TIERRA VERDE FL NOAA Chart: 11414 Latitude: 27° 41.3' N ( 27.68830) USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 43.1' W ( -82.71830) T I D A L D A T U M S Tidal datums at TIERRA VERDE based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: June 1990 - October 1990 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 = 0.659 MEAN HIGH WATER MHW = 0.577 North American Vertical Datum NAVD88 = 0.473 MEAN SEA LEVEL MSL = 0.347 MEAN TIDE LEVEL MTL = 0.340 MEAN LOW WATER MLW = 0.104 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 6428 C 1976 2.576 1.999 6428 E 1976 2.337 1.760 N 17 5.220 4.643 6428 F 1990 2.528 1.951 6428 G 1990 2.328 1.751
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8726428 PUBLICATION DATE: 06/16/2004 Name: TIERRA VERDE FL NOAA Chart: 11414 Latitude: 27° 41.3' N ( 27.68830) USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 43.1' W ( -82.71830) 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.