U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8729101 PUBLICATION DATE: 11/13/2003 Name: SOUTHPORT, NORTH BAY FL NOAA Chart: 11389 Latitude: 30° 17.0' N ( 30.28330) USGS Quad: SOUTHPORT Longitude: 85° 38.8' W ( -85.64670) To reach the tidal bench marks from the intersection of Bridge Street and State Highway 77 in Southport, proceed west on Bridge Street for 0.3 km (0.2 mi) to Railroad Avenue, then turn left and proceed south on Railroad Avenue for 0.9 km (0.6 mi) to Fanning Bayou Drive, then turn right and proceed west on Fanning Bayou Drive for 0.3 km (0.2 mi) to Sale Boulevard, then turn right and proceed north on Sale Boulevard for 0.24 km (0.15 mi) to the W.L. Hibbard residence. The bench marks are around the Hibbard residence and the Douglas residence. The tide gage and staff were located on a pier behind the Hibbard residence. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9101 A 1976 DESIGNATION: 872 9101 A TIDAL MONUMENTATION: Tidal Station disk VM#: 9982 AGENCY: National Ocean Survey (NOS) IDB PID#: BE2962 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 17.0' N ( 30.28330) LONGITUDE: 85° 38.8' W ( -85.64670) The primary bench mark is a disk located 27.74 m (91.0 ft) SW of the SW corner of the swimming pool patio at the W.L. Hibbard residence at 13 Sale Boulevard, 20.27 m (66.5 ft) west of a cabbage palm tree, and 0.76 m (2.5 ft) NE of the the inside corner of the south end of the seawall. The bench mark is set 15 cm (0.5 ft), below ground level, crimped to the top of a copper-clad steel rod driven 12.2 m (40 ft), to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8729101 PUBLICATION DATE: 11/13/2003 Name: SOUTHPORT, NORTH BAY FL NOAA Chart: 11389 Latitude: 30° 17.0' N ( 30.28330) USGS Quad: SOUTHPORT Longitude: 85° 38.8' W ( -85.64670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9101 B 1976 DESIGNATION: 872 9101 B TIDAL MONUMENTATION: Tidal Station disk VM#: 9983 AGENCY: National Ocean Survey (NOS) IDB PID#: BE2961 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 17.0' N ( 30.28330) LONGITUDE: 85° 38.8' W ( -85.64670) The bench mark is a disk located 33.83 m (111.0 ft), east of the NE corner of the W.L. Hibbard residence at 13 Sale Boulevard, 6.40 m (21.0 ft), west of the centerline of Sale Boulevard, 0.55 m (1.8 ft) NNE of a powerline pole. The bench mark is set 15 cm (0.5 ft) below ground level, crimped to the top of a copper-clad steel rod driven 12.2 m (40 ft), to refusal and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8729101 PUBLICATION DATE: 11/13/2003 Name: SOUTHPORT, NORTH BAY FL NOAA Chart: 11389 Latitude: 30° 17.0' N ( 30.28330) USGS Quad: SOUTHPORT Longitude: 85° 38.8' W ( -85.64670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: SOUTHPORT 1935 1964 DESIGNATION: SOUTHPORT RESET MONUMENTATION: Triangulation Station disk VM#: 9984 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BE2964 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 16.8' N ( 30.28000) LONGITUDE: 85° 38.7' W ( -85.64500) The bench mark is a disk set in the top of a concrete monument at the Douglas property, 0.3 km (0.2 mi) south of bench mark 9101 B 1977, 49 m (161 ft) east of two large oak trees, 38.56 m (126.5 ft) WNW of the NW corner of the remains of a lumber mill, 19.57 m (64.2 ft) NW of a 1 m (3 ft) diameter cedar tree, 11 m (36 ft) NE of the water's edge, 1.01 m (3.3 ft) SSW of a metal witness post, and 0.06 m (0.2 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8729101 PUBLICATION DATE: 11/13/2003 Name: SOUTHPORT, NORTH BAY FL NOAA Chart: 11389 Latitude: 30° 17.0' N ( 30.28330) USGS Quad: SOUTHPORT Longitude: 85° 38.8' W ( -85.64670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: SOUTHPORT NO 1 1935 DESIGNATION: SOUTHPORT RM 1 MONUMENTATION: Reference Mark disk VM#: 9985 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BE2963 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 16.8' N ( 30.28000) LONGITUDE: 85° 38.7' W ( -85.64500) The bench mark is a disk set in the top of a concrete monument at the Douglas property, 50.44 m (165.5 ft) SE of the SE wall of the Douglas' garage, 7.68 m (25.2 ft) SSW of the south edge of a man-made pond, 1.01 m (3.3 ft) east of a cedar tree, 0.21 m (0.7 ft) SE of a witness post, and 0.34 m (1.1 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8729101 PUBLICATION DATE: 11/13/2003 Name: SOUTHPORT, NORTH BAY FL NOAA Chart: 11389 Latitude: 30° 17.0' N ( 30.28330) USGS Quad: SOUTHPORT Longitude: 85° 38.8' W ( -85.64670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: SOUTHPORT NO 2 1935 DESIGNATION: SOUTHPORT RM 2 MONUMENTATION: Reference Mark disk VM#: 9986 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BE2965 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 16.8' N ( 30.28000) LONGITUDE: 85° 38.7' W ( -85.64500) The bench mark is a disk set in the top of a concrete monument at the Douglas property, 27.61 m (90.6 ft) SSW of the south corner of the house, 14.17 m (46.5 ft) NE of the shoreline, and 1.55 m (5.1 ft) SE of a pine tree at the SE corner of a flower bed.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8729101 PUBLICATION DATE: 11/13/2003 Name: SOUTHPORT, NORTH BAY FL NOAA Chart: 11389 Latitude: 30° 17.0' N ( 30.28330) USGS Quad: SOUTHPORT Longitude: 85° 38.8' W ( -85.64670) T I D A L D A T U M S Tidal datums at SOUTHPORT, NORTH BAY based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: October 1976 - December 1976 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8729108 PANAMA CITY, ST. ANDREW BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.472 MEAN HIGH WATER MHW = 0.440 MEAN TIDE LEVEL MTL = 0.236 MEAN SEA LEVEL MSL = 0.236 North American Vertical Datum NAVD88 = 0.206 MEAN LOW WATER MLW = 0.032 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9101 A 1976 0.892 0.452 9101 B 1976 1.723 1.283 SOUTHPORT 1935 1964 1.604 1.164 SOUTHPORT NO 1 1935 1.244 0.804 SOUTHPORT NO 2 1935 1.441 1.001
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8729101 PUBLICATION DATE: 11/13/2003 Name: SOUTHPORT, NORTH BAY FL NOAA Chart: 11389 Latitude: 30° 17.0' N ( 30.28330) USGS Quad: SOUTHPORT Longitude: 85° 38.8' W ( -85.64670) 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.