U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 07/29/1990 Station ID: 8729501 SUPERCEDED DATE: 04/21/2003 Name: VALPARAISO, BOGGY BAYOU, CHOCTAWHATCHEE BAY FLORIDA NOAA Chart: 11388 Latitude: 30° 30.1' N USGS Quad: NICEVILLE Longitude: 86° 29.5' W To reach the tidal bench marks from the junction of State Highway 85 and State Road 397 in Valparaiso, proceed south on State Road 397 for 0.4 mile (0.6 km) to Bayshore Drive, then east on Bayshore Drive for 0.3 mile (0.5 km) to Spence Boat Works. The bench marks are along Bayshore Drive, and the tide gage and staff were on the eastern most dock near Spence Boat Works. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9501 A 1977 MONUMENTATION: Survey Disk VM#: 10126 AGENCY: PID#: BG4634 SETTING CLASSIFICATION: Concrete Manhole Foundation The bench mark is set in the top of a concrete manhole foundation, 0.1 mile (0.2 km) east of the intersection of Bayshore Drive and State Road 397, 51.0 feet (15.5 m) NE of the centerline of Bayshore Drive, 18.5 feet (5.6 m) east of a power pole, 5.8 feet (1.8 m) east of the manhole cover, 2.4 feet (0.7 m) NE of the SW face of the manhole foundation, and 1.0 foot (0.3 m) above ground level. BENCH MARK STAMPING: 9501 B 1989 MONUMENTATION: Survey Disk VM#: 10127 AGENCY: PID: SETTING CLASSIFICATION: Concrete Step The bench mark is set in the top of a concrete step which is the support for the shore end of Valpariaso City Pier, on the west end of the step.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 07/29/1990 Station ID: 8729501 SUPERCEDED DATE: 04/21/2003 Name: VALPARAISO, BOGGY BAYOU, CHOCTAWHATCHEE BAY FLORIDA NOAA Chart: 11388 Latitude: 30° 30.1' N USGS Quad: NICEVILLE Longitude: 86° 29.5' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9501 C 1989 MONUMENTATION: Survey Disk VM#: 10128 AGENCY: PID: SETTING CLASSIFICATION: Concrete Step The bench mark is set in the top of a concrete step which leads from Bayshore Drive to the city pier, on the east end of the fifth step down from Bayshore Drive. BENCH MARK STAMPING: NO I MONUMENTATION: Survey Disk VM#: 10129 AGENCY: PID#: BG1509 SETTING CLASSIFICATION: Concrete Retaining Wall The bench mark is set in the top of a concrete retaining wall SE of the intersection of Westview Avenue and Bayshore Drive, 63.0 feet (19.2 m) south of the centerline of Bayshore Drive, 13.0 feet (4.0 m) west of the west face of the gas station without gas at Spence Boat Works sanding area, 4.5 feet (1.4 m) east of the east face of the shop, and 0.5 foot (0.2 m) above ground level. BENCH MARK STAMPING: NO II MONUMENTATION: Survey Disk VM#: 10130 AGENCY: PID#: BG1510 SETTING CLASSIFICATION: Chimney Foundation The bench mark is set in the top of a concrete foundation for a chimney for a two-story building, 45.0 feet (13.7 m) south of the centerline of Bayshore Drive, 20.3 feet (6.2 m) NE of Bench Mark NO I, 16.7 feet (5.1 m) north of the north side of a one-story building, 10.8 feet (3.3 m) SE of the NW corner of the foundation, 9.7 feet (3.0 m) south of the NW corner of the building, and 0.5 foot (0.2 m) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 07/29/1990 Station ID: 8729501 SUPERCEDED DATE: 04/21/2003 Name: VALPARAISO, BOGGY BAYOU, CHOCTAWHATCHEE BAY FLORIDA NOAA Chart: 11388 Latitude: 30° 30.1' N USGS Quad: NICEVILLE Longitude: 86° 29.5' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO III MONUMENTATION: Survey Disk VM#: 10131 AGENCY: PID#: BG1511 SETTING CLASSIFICATION: Concrete Foundation The bench mark is set in the top of a 10x12-foot (3x4 m) concrete foundation for a windlass, 126.0 feet (38.4 m) SE of the junction of Westview Avenue and Bayshore Drive, 73.0 feet (22.3 m) NNE of Bench Mark NO II, 27.5 feet (8.4 m) south of the centerline of Bayshore Drive, and 3.0 feet (0.9 m) SE of the NW corner of the foundation. BENCH MARK STAMPING: NO STAMPING 1 MONUMENTATION: Survey Disk VM#: 10132 AGENCY: PID#: BG4635 SETTING CLASSIFICATION: Concrete Abutment The bench mark is set in the north abutment at the NE corner of the State Road 397 bridge over Toms Bayou (bridge #H15), 14.0 feet (4.3 m) east of the centerline of the northbound lane of the highway, 1.0 foot (0.3 m) above road level, and partially covered by the bridge end rail.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 07/29/1990 Station ID: 8729501 SUPERCEDED DATE: 04/21/2003 Name: VALPARAISO, BOGGY BAYOU, CHOCTAWHATCHEE BAY FLORIDA NOAA Chart: 11388 Latitude: 30° 30.1' N USGS Quad: NICEVILLE Longitude: 86° 29.5' W T I D A L D A T U M S Tidal datums at VALPARAISO, BOGGY BAYOU, CHOCTAWHATCHEE BAY based on: LENGTH OF SERIES: 56 HIGH & LOW WATERS TIME PERIOD: FEBRUARY 10-APRIL 11, 1989 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8729840 PENSACOLA Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (09/04/1977) = 1.69 MEAN HIGHER HIGH WATER MHHW = 0.45 MEAN HIGH WATER MHW = 0.45 MEAN TIDE LEVEL MTL = 0.23 MEAN LOW WATER MLW = 0.00 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (02/25/1989) = -1.56 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 9501 A 1977 4.19 3.74 9501 B 1989 3.30 2.85 9501 C 1989 5.76 5.31 NO I 4.51 4.06 NO II 4.57 4.12 NO III 5.64 5.19 NO STAMPING 1 19.03 18.58
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 07/29/1990 Station ID: 8729501 SUPERCEDED DATE: 04/21/2003 Name: VALPARAISO, BOGGY BAYOU, CHOCTAWHATCHEE BAY FLORIDA NOAA Chart: 11388 Latitude: 30° 30.1' N USGS Quad: NICEVILLE Longitude: 86° 29.5' W 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 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.