U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 11/20/1990 Station ID: 8729736 SUPERCEDED DATE: 04/21/2003 Name: WOODLAWN BEACH, SANTA ROSA SOUND FLORIDA NOAA Chart: 11382 Latitude: 30° 23.2' N USGS Quad: HOLLEY Longitude: 86° 59.8' W To reach the tidal bench marks from the junction of U.S. Highway 98 and State Highway 87 in Navarre, proceed west on U.S. Highway 98 for 7.0 miles (11.3 km) to Oak Street, then south on Oak Street for 0.9 mile (1.4 km) to Soundside Drive and the residence of Mike Simpson, at the SW corner of the intersection. The bench marks are along Soundside Drive and Oak Street. The tide gage and staff were on a private dock south of the Simpson Residence. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9736 E 1977 MONUMENTATION: Survey Disk VM#: 10212 AGENCY: PID#: BG4558 SETTING CLASSIFICATION: Galvanized Steel Rod The bench mark is 300 feet (91 m) west of Bench Mark 9736 A 1977, 25.5 feet (7.8 m) NNW of the centerline of Soundside Drive, and 0.2 foot (0.1 m) south of a witness post. The bench mark is 0.2 foot (0.1 m) below ground level, crimped to a galvanized steel rod driven an unspecified depth to refusal, and encased in a PVC pipe and concrete kickblock. BENCH MARK STAMPING: RANCH 2 1910 1934 MONUMENTATION: Survey Disk VM#: 10209 AGENCY: PID#: BG1892 SETTING CLASSIFICATION: Shallow-set Pipe The bench mark is set in a vitrified clay pipe in the front lawn of the fourth house west of where a power cable crosses the sound, 56.9 feet (17.3 m) SW of the SE corner of the house, 56.6 feet (17.3 m) SE of the SW corner of the house, 1.7 feet (0.5 m) west of the west edge of a sidewalk, and level with the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 11/20/1990 Station ID: 8729736 SUPERCEDED DATE: 04/21/2003 Name: WOODLAWN BEACH, SANTA ROSA SOUND FLORIDA NOAA Chart: 11382 Latitude: 30° 23.2' N USGS Quad: HOLLEY Longitude: 86° 59.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9736 A 1977 MONUMENTATION: Survey Disk VM#: 10210 AGENCY: PID#: BG4557 SETTING CLASSIFICATION: Concrete Monument The bench mark is set flush in the top of a concrete monument, 154.7 feet (47.2 m) north of the gate in the fence around the Peterson residence, 80 feet (24 m) NW of the NW corner of the Simpson residence, 50 feet (15 m) SSW of the intersection of Soundside Drive and Oak Street, 1.8 feet (0.5 m) east of a power pole with witness sign, and level with the ground. BENCH MARK STAMPING: 9736 C 1977 MONUMENTATION: Survey Disk VM#: 10211 AGENCY: PID#: BG4560 SETTING CLASSIFICATION: Concrete Monument The bench mark is set in the top of concrete monument, 370 feet (113 m) ENE of Bench Mark 9736 A 1977, 90 feet (27 m) NE of the driveway to the Knight residence, 32.7 feet (10.0 m) NW of the centerline of Soundside Drive, 0.4 foot (0.1 m) north of a witness post, and level with the ground. BENCH MARK STAMPING: 9736 F 1985 MONUMENTATION: Survey Disk VM#: 10213 AGENCY: PID#: BG4559 SETTING CLASSIFICATION: Concrete Culvert Headwall The bench mark is set in the top of concrete culvert headwall, 0.1 mile (0.2 km) west of Bench Mark 9736 E 1977, 31.0 feet (9.4 m) south of the centerline of Soundside Drive, 7.5 feet (2.3 m) SW of a 1.5-foot (0.5 m) diameter oak tree, and 7.0 feet (2.1 m) east of the west end of the headwall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 11/20/1990 Station ID: 8729736 SUPERCEDED DATE: 04/21/2003 Name: WOODLAWN BEACH, SANTA ROSA SOUND FLORIDA NOAA Chart: 11382 Latitude: 30° 23.2' N USGS Quad: HOLLEY Longitude: 86° 59.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9736 G 1985 MONUMENTATION: Survey Disk VM#: 10214 AGENCY: PID#: BG4556 SETTING CLASSIFICATION: Concrete Monument The bench mark is set in the top of concrete monument, 0.45 mile (0.72 km) north of Bench Mark 9736 A 1977, 215 feet (66 m) south of a driveway at Rural Route 2-Box 998, 24.9 feet (7.6 m) west of the centerline of Oak Street, 2.0 feet (0.6 m) NNE of a power pole, 1.5 feet (0.5 m) east of a witness post, and at ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 11/20/1990 Station ID: 8729736 SUPERCEDED DATE: 04/21/2003 Name: WOODLAWN BEACH, SANTA ROSA SOUND FLORIDA NOAA Chart: 11382 Latitude: 30° 23.2' N USGS Quad: HOLLEY Longitude: 86° 59.8' W T I D A L D A T U M S Tidal datums at WOODLAWN BEACH, SANTA ROSA SOUND based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: JANUARY-APRIL 1986 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) = 2.72 MEAN HIGHER HIGH WATER MHHW = 1.38 MEAN HIGH WATER MHW = 1.32 MEAN TIDE LEVEL MTL = 0.68 MEAN LOW WATER MLW = 0.04 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (01/21/1985) = -1.45 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 9736 E 1977 7.33 6.01 RANCH 2 1910 1934 6.32 5.00 9736 A 1977 17.10 15.78 9736 C 1977 12.87 11.55 9736 F 1985 6.22 4.90 9736 G 1985 20.58 19.26
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 11/20/1990 Station ID: 8729736 SUPERCEDED DATE: 04/21/2003 Name: WOODLAWN BEACH, SANTA ROSA SOUND FLORIDA NOAA Chart: 11382 Latitude: 30° 23.2' N USGS Quad: HOLLEY Longitude: 86° 59.8' 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.