U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 PUBLICATION DATE: 06/26/1985 Station ID: 8720409 SUPERCEDED DATE: 04/21/2003 Name: JULINGTON CREEK FLORIDA NOAA Chart: 11491 Latitude: 30° 8.1' N USGS Quad: ORANGE PARK Longitude: 81° 37.8' W To reach the tidal bench marks from the intersection of Interstate 295 and State Road 13 proceed 3.4 miles (5.4 km) south along State Road 13 to Reitman Marina. The bench marks are located in the vicinity of State Road 13 and the concrete bridge over Julington Creek. The tide gage and staff were located on the marina dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0409 A 1978 MONUMENTATION: Survey Disk VM#: 5182 AGENCY: PID#: BC1539 SETTING CLASSIFICATION: Concrete Post The bench mark is set atop a concrete post, 113 feet (34 m) SE of a double utility pole, 93 feet (28 m) south of Julington Creek Seafood Restaurant sign, and 12 feet (4 m) NW of the entrance to Reitman Marina. BENCH MARK STAMPING: 0409 C 1978 MONUMENTATION: Survey Disk VM#: 5183 AGENCY: PID#: BC1536 SETTING CLASSIFICATION: Concrete Headwall The bench mark is set in a concrete headwall, 180 feet (55 m) south of the intersection of Westberry Road and State Road 13, 30 feet (9 m) NE of the flagpole in front of the Ace Hardware store, 21 feet (6 m) west of the centerline of State Road 13, and 4 feet (1 m) north of a witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 4 PUBLICATION DATE: 06/26/1985 Station ID: 8720409 SUPERCEDED DATE: 04/21/2003 Name: JULINGTON CREEK FLORIDA NOAA Chart: 11491 Latitude: 30° 8.1' N USGS Quad: ORANGE PARK Longitude: 81° 37.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0409 E 1982 MONUMENTATION: Survey Disk VM#: 5184 AGENCY: PID: SETTING CLASSIFICATION: Concrete Headwall The bench mark is set in the concrete headwall, 139.0 feet (42.4 m) north of the centerline of Julington Creek Road, 58.5 feet (17.8 m) west of the center of the double doors to American Federal Savings and Loan, 28.0 feet (8.5 m) east of the centerline of State Road 13, and 3.5 feet (1.1 m) south of the north end of the culvert headwall. BENCH MARK STAMPING: JC 3 1978 C.L.B. MONUMENTATION: Survey Disk VM#: 5185 AGENCY: PID#: BC1535 SETTING CLASSIFICATION: Concrete Headwall The bench mark is set in a concrete headwall, 345 feet (105 m) south of the intersection of State Road 13 and Marbon Road, 130.5 feet (39.8 m) SE of a utility pole, and 21 feet (6 m) east of the centerline of State Road 13. BENCH MARK STAMPING: NO STAMPING 1 MONUMENTATION: Survey Disk VM#: 5186 AGENCY: PID: SETTING CLASSIFICATION: Concrete Guardrail The bench mark is set in the top of the concrete guardrail at the NW bridge corner, 19 feet (6 m) SW of the centerline of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 4 PUBLICATION DATE: 06/26/1985 Station ID: 8720409 SUPERCEDED DATE: 04/21/2003 Name: JULINGTON CREEK FLORIDA NOAA Chart: 11491 Latitude: 30° 8.1' N USGS Quad: ORANGE PARK Longitude: 81° 37.8' W T I D A L D A T U M S Tidal datums at JULINGTON CREEK based on: LENGTH OF SERIES: 6 MONTHS TIME PERIOD: MAY-OCTOBER 1978 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8720496 GREEN COVE SPRINGS Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (11/04/1978) = 2.07 MEAN HIGHER HIGH WATER MHHW = 0.83 MEAN HIGH WATER MHW = 0.78 MEAN TIDE LEVEL MTL = 0.43 MEAN LOW WATER MLW = 0.07 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (07/30/1978) = -0.67 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 0409 A 1978 4.47 3.69 0409 C 1978 15.97 15.19 0409 E 1982 10.41 9.63 JC 3 1978 C.L.B. 20.08 19.30 NO STAMPING 1 14.19 13.41
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 PUBLICATION DATE: 06/26/1985 Station ID: 8720409 SUPERCEDED DATE: 04/21/2003 Name: JULINGTON CREEK FLORIDA NOAA Chart: 11491 Latitude: 30° 8.1' N USGS Quad: ORANGE PARK Longitude: 81° 37.8' 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.