U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8745557 PUBLICATION DATE: 09/03/2015 Name: GULFPORT HARBOR, MISSISSIPPI SOUND MS NOAA Chart: 11372 Latitude: 30° 21.6' N ( 30.36000) USGS Quad: GULFPORT SOUTH Longitude: 89° 4.9' W ( -89.08170) To reach the tidal bench marks from the intersection of 20th Avenue and U.S. Highway 90 in Gulfport, proceed south on 20th Avenue for 0.6 km (0.4 mi) to the foot of a jetty leading to the SE. Proceed by foot along the jetty for 305 m (1000 ft) to the John C. Moses Fishing Pier. The bench marks are north of the Moses Pier along 20th Avenue. The tide gage and staff were on the east side of the pier. The station is located at the small craft harbor of Gulfport, Mississippi on a public pier on the east side of the breakwater. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5557 C 1979 DESIGNATION: 874 5557 C MONUMENTATION: Bench Mark disk VM#: 10382 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Surrounded by a mass of concrete OPUS PID: LATITUDE: 30° 22.0' N ( 30.36606) LONGITUDE: 89° 5.2' W ( -89.08628) The primary bench mark is a disk located the Coast Guard station at Gulf Port Harbor, 66.0 m (216.5 ft) NW of bench mark NO 3 1969, 32.0 m (105.0 ft) NE of a flag pole in front of the old Coast Guard Station, 26.0 m (85.3 ft) west of a concrete sea wall along the east shore, 1.13 m (3.71 ft) north of the south curb of a median with rose garden in front of the station, and 0.91 m (2.98 ft), SW of a palm tree in said median. The bench mark is set 0.09 m (0.29 ft) below ground level, crimped to the top of a stainless steel rod driven 15.2 m (49.9 ft) to substantial resistance, and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8745557 PUBLICATION DATE: 09/03/2015 Name: GULFPORT HARBOR, MISSISSIPPI SOUND MS NOAA Chart: 11372 Latitude: 30° 21.6' N ( 30.36000) USGS Quad: GULFPORT SOUTH Longitude: 89° 4.9' W ( -89.08170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 1 1969 DESIGNATION: 874 5557 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 10377 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BH0867 SETTING CLASSIFICATION: Retaining wall OPUS PID: LATITUDE: 30° 21.9' N ( 30.36450) LONGITUDE: 89° 5.2' W ( -89.08614) The bench mark is a disk set in the top of the concrete sea wall along a street on the east side of the City of Gulfport Marina, 39.93 m (131.00 ft) SW and across the street from bench mark NO 2 1969, 5.03 m (16.50 ft) west of the center line of 20th Avenue, 2.44 m (8.01 ft) south of the south side of the entrance to pier, 0.79 m (2.59 ft) below the top of a retaining wall on the top of the sea wall, and about 15 cm (0.49 ft) ablove the level of the street. BENCH MARK STAMPING: NO 2 1969 DESIGNATION: 874 5557 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 10378 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BH0865 SETTING CLASSIFICATION: Retaining wall OPUS PID#: BH0865 LATITUDE: 30° 21.9' N ( 30.36450) LONGITUDE: 89° 5.2' W ( -89.08600) The bench mark is a disk set in the top of a concrete sea wall along a street on the east side of the City of Gulfport Marina, 74.49 m (244.39 ft) south of bench mark NO. 3 1969, 39.93 m (131.00 ft) NE and across the street from bench mark NO. 1 1969, 37 m (121.4 ft) NE and across the street from the center of the entrance to pier, 6.25 m (20.51 ft) east of the center line of 20th Avenue, and about 15 cm (0.49 ft) above the level of the street.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8745557 PUBLICATION DATE: 09/03/2015 Name: GULFPORT HARBOR, MISSISSIPPI SOUND MS NOAA Chart: 11372 Latitude: 30° 21.6' N ( 30.36000) USGS Quad: GULFPORT SOUTH Longitude: 89° 4.9' W ( -89.08170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 3 1969 DESIGNATION: 874 5557 TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 10379 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BH0864 SETTING CLASSIFICATION: Retaining wall OPUS PID: LATITUDE: 30° 21.9' N ( 30.36550) LONGITUDE: 89° 5.2' W ( -89.08600) The bench mark is a disk set in the top of a concrete sea wall along a street on the east side of the City of Gulfport Marina, 0.32 km (0.20 mi) south along the street on the east side of the City of Gulfport Marina from the junction of 20th Street and U.S. Highway 90 at Gulfport, 74.49 m (244.39 ft) north of bench mark NO. 2 1969, 22.77 m (74.705 ft) SE and across the street from the north end of the sea wall, 6.25 m (20.51 ft) east of the center line of 20th Avenue, and about 15 cm (0.49 ft) above the level of the street. BENCH MARK STAMPING: MS-09B/98 DESIGNATION: 874 5557 MS-09B MONUMENTATION: Tidal Station disk VM#: 18259 AGENCY: US Army Corps of Engineers (COE) IDB PID#: SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 30° 22.0' N ( 30.36636) LONGITUDE: 89° 5.2' W ( -89.08600) The bench mark is a disk set in the top of the concrete sea wall along a street on the east side of the City of Gulfport Marina, 0.2 km (0.10 mi) south along the street on the east side of the City of Gulfport Marina from the junction of 20th Street and US Highway 90 at Gulfport, 103.6 m (339.9 ft) north of the bench mark NO. 3 1969, 4.57 m (14.99 ft) east from the centerline of 20th Avenue, 15.6 m (51.2 ft) SW from a fire hydrant, and about 0.15 m (0.49 ft) above the level of the street.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8745557 PUBLICATION DATE: 09/03/2015 Name: GULFPORT HARBOR, MISSISSIPPI SOUND MS NOAA Chart: 11372 Latitude: 30° 21.6' N ( 30.36000) USGS Quad: GULFPORT SOUTH Longitude: 89° 4.9' W ( -89.08170) T I D A L D A T U M S Tidal datums at GULFPORT HARBOR, MISSISSIPPI SOUND based on: LENGTH OF SERIES: 4 YEARS TIME PERIOD: Jan 2006 - Dec 2007 and Jan 2009 - Dec 2010 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8735180 DAUPHIN ISLAND, MOBILE BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (11/10/2009) = 1.428 MEAN HIGHER HIGH WATER MHHW = 0.527 MEAN HIGH WATER MHW = 0.499 MEAN SEA LEVEL MSL = 0.267 MEAN TIDE LEVEL MTL = 0.265 North American Vertical Datum NAVD88 = 0.227 MEAN LOW WATER MLW = 0.030 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/14/2006) = -0.839 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5557 C 1979 2.213 1.714 NO 1 1969 2.500 2.001 NO 2 1969 2.238 1.739 NO 3 1969 2.231 1.732 MS-09B/98 2.258 1.759
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8745557 PUBLICATION DATE: 09/03/2015 Name: GULFPORT HARBOR, MISSISSIPPI SOUND MS NOAA Chart: 11372 Latitude: 30° 21.6' N ( 30.36000) USGS Quad: GULFPORT SOUTH Longitude: 89° 4.9' W ( -89.08170) 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.