U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8742947 PUBLICATION DATE: 04/21/2003 Name: EASTERN OLD FORT BAYOU MS NOAA Chart: NA Latitude: 30° 26.3' N ( 30.43830) USGS Quad: PASCAGOULA Longitude: 88° 43.8' W ( -88.73000) To reach the tidal bench marks from the intersection of U.S. Highway 90 and Ocean Springs Road to a dirt drive on the north side of the road, proceed 152 m (500 ft) north on the dirt drive to the Broussard residence on Old Fort Bayou. The bench marks are located in the vicinity of the Broussard residence and Ocean Springs Road. The tide gage and staff were located on the north end of the Broussard's residence private pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 2947 A 1979 DESIGNATION: 874 2947 A MONUMENTATION: Tidal Station disk VM#: 11453 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 26.4' N ( 30.44000) LONGITUDE: 88° 43.6' W ( -88.72670) The primary bench mark is a disk located near the shore of Old Fort Bayou, 17.80 m (58.4 ft) NE of the NE corner of a garage/workshop, 16.89 m (55.4 ft) west of the NE corner of the Broussard residence, 4.90 m (16.1 ft) NW of the NW corner of the residence, 4.05 m (13.3 ft) south of the bulkhead on Old Fort Bayou, and 2.90 m (9.5 ft) SW of a 0.91 m (3.0 ft) diameter oak tree. The bench mark is 9 cm (0.3 ft) below ground level, crimped to a stainless steel rod driven 18.3 m (60 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: 8742947 PUBLICATION DATE: 04/21/2003 Name: EASTERN OLD FORT BAYOU MS NOAA Chart: NA Latitude: 30° 26.3' N ( 30.43830) USGS Quad: PASCAGOULA Longitude: 88° 43.8' W ( -88.73000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2947 B 1979 DESIGNATION: 874 2947 B MONUMENTATION: Tidal Station disk VM#: 11454 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete post OPUS PID: LATITUDE: 30° 26.4' N ( 30.44000) LONGITUDE: 88° 43.6' W ( -88.72670) The bench mark is a disk set flush in a concrete post along the west side of the dirt drive to the Broussard residence, 64.31 m (211.0 ft) south of bench mark 2947 A 1979, 49.14 m (161.2 ft) north of the centerline of Ocean Springs Road, 14 m (46 ft) NW of a 0.46 m (1.5 ft) diameter oak tree, 10.64 m (34.9 ft) east of a 0.46 m (1.5 ft) diameter palm tree, and 4 m (12 ft) west of the centerline of the driveway. BENCH MARK STAMPING: 2947 C 1979 DESIGNATION: 874 2947 C MONUMENTATION: Tidal Station disk VM#: 11455 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete post OPUS PID: LATITUDE: 30° 26.4' N ( 30.44000) LONGITUDE: 88° 43.6' W ( -88.72670) The bench mark is a disk set flush in a concrete post, on the north side of Ocean Springs Road, 76 m (249 ft) NE of the centerline of the dirt drive to the Broussard residence, 71 m (233 ft) east of bench mark 2947 B 1979, 18.41 m (60.4 ft) NE of a telephone junction box, 11 m (36 ft) NW of the centerline of Ocean Springs Road, and 2.41 m (7.9 ft) NW of power pole #B-163 SPC-906-40.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8742947 PUBLICATION DATE: 04/21/2003 Name: EASTERN OLD FORT BAYOU MS NOAA Chart: NA Latitude: 30° 26.3' N ( 30.43830) USGS Quad: PASCAGOULA Longitude: 88° 43.8' W ( -88.73000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2947 D 1979 DESIGNATION: 874 2947 D MONUMENTATION: Tidal Station disk VM#: 11456 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 26.4' N ( 30.44000) LONGITUDE: 88° 43.6' W ( -88.72670) The bench mark is a disk located 124 m (407 ft) west of bench mark 2947 C 1979, 69 m (226 ft) ENE of the centerline of the Danley driveway, 48 m (157 ft) WSW of the centerline of the Broussard driveway, 12.31 m (40.4 ft) WSW of power pole #52, and 9.57 m (31.4 ft) NW of the centerline of Ocean Springs Road. The bench mark is 12 cm (0.4 ft) below ground level, crimped to a stainless steel rod driven 16.8 m (55 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 4 of 5 Station ID: 8742947 PUBLICATION DATE: 04/21/2003 Name: EASTERN OLD FORT BAYOU MS NOAA Chart: NA Latitude: 30° 26.3' N ( 30.43830) USGS Quad: PASCAGOULA Longitude: 88° 43.8' W ( -88.73000) T I D A L D A T U M S Tidal datums at EASTERN OLD FORT BAYOU based on: LENGTH OF SERIES: 3 Months TIME PERIOD: February 1980 - April 1980 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8743735 BILOXI (CADET POINT), BILOXI BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.627 MEAN HIGH WATER MHW = 0.537 MEAN SEA LEVEL MSL = 0.329 MEAN TIDE LEVEL MTL = 0.311 MEAN LOW WATER MLW = 0.085 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 2947 A 1979 1.459 0.922 2947 B 1979 2.319 1.782 2947 C 1979 2.033 1.496 2947 D 1979 2.205 1.668
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8742947 PUBLICATION DATE: 04/21/2003 Name: EASTERN OLD FORT BAYOU MS NOAA Chart: NA Latitude: 30° 26.3' N ( 30.43830) USGS Quad: PASCAGOULA Longitude: 88° 43.8' W ( -88.73000) 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.