U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 PUBLICATION DATE: 08/23/1984 Station ID: 8729154 SUPERCEDED DATE: 04/21/2003 Name: BURNT MILL CREEK, WEST BAY FLORIDA NOAA Chart: 11390 Latitude: 30° 19.7' N USGS Quad: WEST BAY Longitude: 85° 45.8' W To reach the tidal bench marks from the intersection of State Highway 79 and State Highway S-388 in West Bay proceed 5.8 miles (9.3 km) along State Highway S-388 to the intersection of State Highway S-388 and South Burnt Mill Road. Continue south on South Burnt Mill Road to the residence of C.L. Boyd. The bench marks are located on the vicintiy of the Boyd residence and extend along State Highway S-388 to the road bridge over Burnt Mill Creek. The tide gage and staff were located on the dock behind the Boyd residence. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9154 A 1976 MONUMENTATION: Survey Disk VM#: 10027 AGENCY: PID#: BE2977 SETTING CLASSIFICATION: Copper-Coated Steel Rod The bench mark is 180.0 feet (54.9 m) east of Bench Mark 9154 C 1976, 45.2 feet (13.8 m) south of the centerline of State Highway S-388, 17.3 feet (5.3 m) east of the centerline of Burnt Mill Road and 1.3 feet (0.4 m) south of a power pole. The bench mark is crimped to the copper-coated steel rod driven to refusal, encased in a PVC pipe and concrete kickblock, 0.5 feet (0.1 m) below ground level. BENCH MARK STAMPING: 9154 B 1976 MONUMENTATION: Survey Disk VM#: 10028 AGENCY: PID#: BE2978 SETTING CLASSIFICATION: Copper-Coated Steel Rod The bench mark is on the Property of C.L. Boyd, 726.0 feet (221.3 m) south of Bench Mark 9154 A 1976, 126.5 feet (38.6 m) ESE of the SE corner of the Boyd residence, 25.0 feet (7.6 m) west of the centerline of south Burnt Mill Road and 2.8 feet (0.8 m) north of a power pole. The bench mark is crimped to the copper-coated steel rod driven to refusal, encased in a PVC pipe and concrete kickblock, 0.6 feet (0.2 m) below ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 4 PUBLICATION DATE: 08/23/1984 Station ID: 8729154 SUPERCEDED DATE: 04/21/2003 Name: BURNT MILL CREEK, WEST BAY FLORIDA NOAA Chart: 11390 Latitude: 30° 19.7' N USGS Quad: WEST BAY Longitude: 85° 45.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9154 C 1976 MONUMENTATION: Survey Disk VM#: 10029 AGENCY: PID#: BE2979 SETTING CLASSIFICATION: Concrete Culvert The bench mark is set flush in top of a concrete culvert on State Highway S-388, 223.0 feet (68.0 m) east of Bench Mark J 291, 220 feet (67.1 m) east of the east end of the State Highway S-388 bridge over Burnt Mill Creek and 26.8 feet (8.2 m) south of the centerline of the highway, set flush into the center of the concrete culvert. BENCH MARK STAMPING: H 291 1967 MONUMENTATION: Survey Disk VM#: 10030 AGENCY: PID#: BE0619 SETTING CLASSIFICATION: Concrete Footing The bench mark is set flush on the top of the west end ofthe north concrete footing for the north bannister of the U.S. Highway S-388 bridge over Burnt Mill Creek 295.3 feet (90.0 west of Bench Mark J 291 13.0 feet (4.0 m) nroth of centerline of the highway, 0.4foot (0.12 m) south of the north bannister, 0.5 foot (0.15 m) above road level. BENCH MARK STAMPING: J 291 MONUMENTATION: Survey Disk VM#: 10031 AGENCY: PID#: BE0620 SETTING CLASSIFICATION: Concrete Footing The bench mark is set flush in the top of the east end of the south concrete footing for the south concrete bannister of the U.S. Highway S-388 bridge over Burnt Mill Creek,12.0 feet (3.7 m) south of the centerline of highway 0.8 foot (0.24 m) north of the south concrete bannister 0.5 foot (0.15 m) above road level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 4 PUBLICATION DATE: 08/23/1984 Station ID: 8729154 SUPERCEDED DATE: 04/21/2003 Name: BURNT MILL CREEK, WEST BAY FLORIDA NOAA Chart: 11390 Latitude: 30° 19.7' N USGS Quad: WEST BAY Longitude: 85° 45.8' W T I D A L D A T U M S Tidal datums at BURNT MILL CREEK, WEST BAY based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: OCTOBER-DECEMBER 1976 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 (12/25/1975) = 2.58 MEAN HIGHER HIGH WATER MHHW = 1.43 MEAN HIGH WATER MHW = 1.33 MEAN TIDE LEVEL MTL = 0.73 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 0.24 MEAN LOW WATER MLW = 0.12 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (11/17/1976) = -1.26 * NGVD is based on elevations published in Quad 300853, June 1973 and NOS leveling of October 1976. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 9154 A 1976 16.65 15.22 9154 B 1976 12.38 10.98 9154 C 1976 14.99 13.56 H 291 1967 12.73 11.30 J 291 14.72 13.29
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 PUBLICATION DATE: 08/23/1984 Station ID: 8729154 SUPERCEDED DATE: 04/21/2003 Name: BURNT MILL CREEK, WEST BAY FLORIDA NOAA Chart: 11390 Latitude: 30° 19.7' N USGS Quad: WEST BAY Longitude: 85° 45.8' 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.