U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 08/14/1991 Station ID: 8729197 SUPERCEDED DATE: 04/21/2003 Name: WEST BAY CREEK, WEST BAY, ST. ANDREW BAY FLORIDA NOAA Chart: 11389 Latitude: 30° 17.6' N USGS Quad: WEST BAY Longitude: 85° 51.5' W To reach the tidal bench marks from state highway 79 in West Bay proceed NE on State Highway 79 to the drawbridge over West Bay Creek. The bench marks are along state highway 79 and near the fish market. The tide gage and staff were east of the bridge at the end of the most SE dock at Whites Fish Market. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1975 MONUMENTATION: Survey Disk VM#: 10067 AGENCY: PID#: BE1325 SETTING CLASSIFICATION: Concrete Sea Wall The primary bench mark is set in the top of a concrete sea wall at Whites Fish Market, 129.0 feet (39.3 m) ESE of Bench Mark NO 2 1975, 53.5 feet (16.3 m) SE of the NW corner of a wood frame building and 20.0 feet (6.1 m) SW of the NE corner of the sea wall. BENCH MARK STAMPING: WEST BAY NO 2 1935 MONUMENTATION: Survey Disk VM#: 10064 AGENCY: PID#: BE0634 SETTING CLASSIFICATION: Concrete Monument The bench mark is set in the top of a concrete monument, 193 feet (59 m) west of the SW end of the NW concrete bannister of the bridge, 111.5 feet (34.0 m) NNW of the north corner of a two-story concrete block building, 8 feet (2 m) SE of a 0.8-foot (0.2 m) diameter oak tree, 1 foot (0.3 m) NE of the NE side of a mobile home, and 0.4 foot (0.1 m) above ground level. Note: The concrete monument is leaning slightly.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 08/14/1991 Station ID: 8729197 SUPERCEDED DATE: 04/21/2003 Name: WEST BAY CREEK, WEST BAY, ST. ANDREW BAY FLORIDA NOAA Chart: 11389 Latitude: 30° 17.6' N USGS Quad: WEST BAY Longitude: 85° 51.5' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: P 176 1957 MONUMENTATION: Survey Disk VM#: 10065 AGENCY: PID#: BE0633 SETTING CLASSIFICATION: Bridge Abutment The bench mark is set in top of the SE end of the NE abutment of the bridge, 18.5 feet (5.6 m) SE of the centerline of the highway, and 0.5 foot (0.2 m) above the level of the road. BENCH MARK STAMPING: N 177 1957 MONUMENTATION: Survey Disk VM#: 10066 AGENCY: PID#: BE0635 SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is 0.15 mile (0.24 km) SW of the SW end of the bridge 67.0 feet (20.4 m) SSE of the center of the junction of the highway and a paved road leading south to West Bay School, 63.0 feet (19.2 m) SE of the centerline of the highway, 41.0 feet (12.5 m) east of the centerline of the paved road leading south, 40.0 feet (12.2 m) SW of the west corner of a house, 20.5 feet (6.2 m) SE of a powerline pole, and 1.5 feet (0.5 m) NW of a witness post. The bench mark is 0.2 foot (0.1 m) above ground level, crimped to the top of a copper-clad steel rod driven 50 feet (15 m) to refusal, and encased in a tile pipe. BENCH MARK STAMPING: NO 2 1975 MONUMENTATION: Survey Disk VM#: 10068 AGENCY: PID#: BE1324 SETTING CLASSIFICATION: Concrete Step The bench mark is set flush in the concrete step at the NE side and rear of Whites Fish Market and 13 feet (4 m) south of the sea wall 2.0 feet (0.6 m) from the NW corner of the fish market building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 08/14/1991 Station ID: 8729197 SUPERCEDED DATE: 04/21/2003 Name: WEST BAY CREEK, WEST BAY, ST. ANDREW BAY FLORIDA NOAA Chart: 11389 Latitude: 30° 17.6' N USGS Quad: WEST BAY Longitude: 85° 51.5' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 3 1975 MONUMENTATION: Survey Disk VM#: 10069 AGENCY: PID#: BE1323 SETTING CLASSIFICATION: Concrete Walkway The bench mark is set in the concrete walkway at the front entrance to Whites Fish Market, 80.0 feet (24.4 m) NW of a powerline pole, 26.0 feet (7.9 m) SE of the west corner of fish market building, 21.5 feet (6.6 m) NW of the west corner of a brick house and 3.5 feet (1.1 m) NW of the SE corner of the fish market building. BENCH MARK STAMPING: NO 6 1975 MONUMENTATION: Survey Disk VM#: 10070 AGENCY: PID#: BE1322 SETTING CLASSIFICATION: Concrete Wing Wall The bench mark is set in the SE end of the SW abutment wing wall of the bridge, 0.2 mile (0.3 km) south of Bench Mark P 176 1957, 18.5 feet (5.6 m) SE of the centerline of the highway and 16.5 feet (5.0 m) NE of the center of a manhole cover on the SE side of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 08/14/1991 Station ID: 8729197 SUPERCEDED DATE: 04/21/2003 Name: WEST BAY CREEK, WEST BAY, ST. ANDREW BAY FLORIDA NOAA Chart: 11389 Latitude: 30° 17.6' N USGS Quad: WEST BAY Longitude: 85° 51.5' W T I D A L D A T U M S Tidal datums at WEST BAY CREEK, WEST BAY, ST. ANDREW BAY based on: LENGTH OF SERIES: 10 MONTHS TIME PERIOD: FEBRUARY-NOVEMBER 1976 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8729108 PANAMA CITY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (12/25/1977) = 3.27 MEAN HIGHER HIGH WATER MHHW = 1.51 MEAN HIGH WATER MHW = 1.38 MEAN TIDE LEVEL MTL = 0.76 MEAN LOW WATER MLW = 0.13 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (11/17/1976) = -1.65 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW NO 1 1975 4.06 2.68 WEST BAY NO 2 1935 8.59 7.21 P 176 1957 17.63 16.25 N 177 1957 7.07 5.69 NO 2 1975 3.97 2.59 NO 3 1975 7.28 5.90 NO 6 1975 12.47 11.09
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 08/14/1991 Station ID: 8729197 SUPERCEDED DATE: 04/21/2003 Name: WEST BAY CREEK, WEST BAY, ST. ANDREW BAY FLORIDA NOAA Chart: 11389 Latitude: 30° 17.6' N USGS Quad: WEST BAY Longitude: 85° 51.5' 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.