U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8726604 PUBLICATION DATE: 04/01/2004 Name: LONG SHOAL, MACDILL AFB FL NOAA Chart: 11412 Latitude: 27° 51.3' N ( 27.85500) USGS Quad: GIBSONTON Longitude: 82° 28.8' W ( -82.48000) To reach the tidal bench marks from the Bayshore Drive Gate at MacDill Air Force Base, proceed 1.3 km (0.8 mi) south on Bayshore Drive. The bench marks are located along Bayshore Drive. The tide gage and staff were located on the southernmost wharf at the Air Force Base. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1975 DESIGNATION: 872 6604 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 6608 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7532 SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 27° 51.3' N ( 27.85500) LONGITUDE: 82° 28.4' W ( -82.47330) The primary bench mark is a disk set flush in the NW corner of a concrete pad located on the NW end of the NOC Annex Building 349, 48 m (158 ft) NE of the bench mark NO 2 1975, 11 m (35 ft) west of the west edge of the dock, 6.83 m (22.4 ft) NW of the NE corner of building 353, 2 m (7 ft) NE of the NW corner of building 349, and 0.3 m (1 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 8 Station ID: 8726604 PUBLICATION DATE: 04/01/2004 Name: LONG SHOAL, MACDILL AFB FL NOAA Chart: 11412 Latitude: 27° 51.3' N ( 27.85500) USGS Quad: GIBSONTON Longitude: 82° 28.8' W ( -82.48000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 2 1975 DESIGNATION: 872 6604 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 6609 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7533 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 27° 51.3' N ( 27.85500) LONGITUDE: 82° 28.9' W ( -82.48170) The bench mark is a disk located near the docks and building #353, 53 m (173 ft) west of the west edge of dock, 48 m (158 ft) SW of bench mark NO 1 1975, 48 m (158 ft) west of bench mark MDF-46 1952, 19.0 m (62.5 ft) east of the centerline of Bayshore Drive, and 1 m (2 ft) north of utility pole #1-29A1. The bench mark is crimped to the top of a copper-clad steel rod driven 14.6 m (48 ft) to refusal, encased in a PVC pipe and a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8726604 PUBLICATION DATE: 04/01/2004 Name: LONG SHOAL, MACDILL AFB FL NOAA Chart: 11412 Latitude: 27° 51.3' N ( 27.85500) USGS Quad: GIBSONTON Longitude: 82° 28.8' W ( -82.48000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MDF-46 1952 DESIGNATION: MDF 46 USE MONUMENTATION: Bench Mark disk VM#: 6610 AGENCY: US Army Corps of Engineers (USE) IDB PID#: AG7534 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 27° 51.3' N ( 27.85500) LONGITUDE: 82° 28.9' W ( -82.48170) The bench mark is a disk set flush in a concrete monument, 48 m (158 ft) east of bench mark NO 2 1975, 16 m (51 ft) SE of the SW corner of building #349, 12.41 m (40.7 ft) SE of the SE corner of building #353, and 5 m (15 ft) west of the west edge of the docks.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8726604 PUBLICATION DATE: 04/01/2004 Name: LONG SHOAL, MACDILL AFB FL NOAA Chart: 11412 Latitude: 27° 51.3' N ( 27.85500) USGS Quad: GIBSONTON Longitude: 82° 28.8' W ( -82.48000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MDF 97 JAX 1966 DESIGNATION: MDF 97 USE MONUMENTATION: Bench Mark disk VM#: 6611 AGENCY: US Army Corps of Engineers (USE) IDB PID#: AG7531 SETTING CLASSIFICATION: Concrete pavement OPUS PID: LATITUDE: 27° 51.3' N ( 27.85500) LONGITUDE: 82° 29.2' W ( -82.48670) The bench mark is a disk set flush in a concrete road, 67 m (221 ft) NNE of the NW corner of Building 501 Readiness Command Headquarters), 25 m (83 ft) SW of a flagpole, and 6.80 m (22.3 ft) west of the east curb of Tampa Boulevard.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8726604 PUBLICATION DATE: 04/01/2004 Name: LONG SHOAL, MACDILL AFB FL NOAA Chart: 11412 Latitude: 27° 51.3' N ( 27.85500) USGS Quad: GIBSONTON Longitude: 82° 28.8' W ( -82.48000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MDF 101 1967 DESIGNATION: MDF 101 USE MONUMENTATION: Bench Mark disk VM#: 6612 AGENCY: US Army Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 27° 51.3' N ( 27.85500) LONGITUDE: 82° 28.8' W ( -82.48000) The bench mark is a disk set in a concrete pad located in a grassy park area near a flagpole, 22 m (72 ft) north of bench mark MDF 97 JAX 1966, and 13.90 m (45.6 ft) WNW of the flagpole.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8726604 PUBLICATION DATE: 04/01/2004 Name: LONG SHOAL, MACDILL AFB FL NOAA Chart: 11412 Latitude: 27° 51.3' N ( 27.85500) USGS Quad: GIBSONTON Longitude: 82° 28.8' W ( -82.48000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: H 262 1966 DESIGNATION: H 262 MONUMENTATION: Bench Mark disk VM#: 17211 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AG6112 SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 27° 51.0' N ( 27.85000) LONGITUDE: 82° 29.5' W ( -82.49170) The bench mark is a disk set vertically in the SW face near the south corner of the concrete foundation to the offset of the SE side of hangar #5, 0.4 m (1.4 ft) NW of the south corner of the foundation, 0.3 m (1.1 ft) above the sidewalk, and 1 m (2 ft) above the level of the parking ramp.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 8 Station ID: 8726604 PUBLICATION DATE: 04/01/2004 Name: LONG SHOAL, MACDILL AFB FL NOAA Chart: 11412 Latitude: 27° 51.3' N ( 27.85500) USGS Quad: GIBSONTON Longitude: 82° 28.8' W ( -82.48000) T I D A L D A T U M S Tidal datums at LONG SHOAL, MACDILL AFB based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: December 1975 - December 1975 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 = 0.720 North American Vertical Datum NAVD88 = 0.492 MEAN SEA LEVEL MSL = 0.436 MEAN TIDE LEVEL MTL = 0.418 MEAN LOW WATER MLW = 0.116 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 1 1975 1.928 1.208 NO 2 1975 1.901 1.181 MDF-46 1952 1.923 1.203 MDF 97 JAX 1966 2.864 2.144 MDF 101 1967 2.916 2.196 H 262 1966 3.256 2.536
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 8 Station ID: 8726604 PUBLICATION DATE: 04/01/2004 Name: LONG SHOAL, MACDILL AFB FL NOAA Chart: 11412 Latitude: 27° 51.3' N ( 27.85500) USGS Quad: GIBSONTON Longitude: 82° 28.8' W ( -82.48000) 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.