U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 05/30/1989 Station ID: 8720004 SUPERCEDED DATE: 04/21/2003 Name: CRANDALL, ST MARYS RIVER FLORIDA NOAA Chart: 11502 Latitude: 30° 43.3' N USGS Quad: ST. MARYS Longitude: 81° 37.3' W To reach the tidal bench marks from the intersection of U.S. Highway 17 and State Highway A1A in Yulle, proceed 3.7 miles (6.0 km) north on Highway 17 to its intersection with Crandall Road (dirt drive), then 3.6 miles (5.8 km) north on Crandall Road to the Rayonier SE Timber Division Recreation Area on the south bank of St Marys River. The bench marks are in the recreation area. The tide gage and staff were on the wooden seawall of the recreation area. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0004 C 1977 MONUMENTATION: Survey Disk VM#: 4970 AGENCY: PID#: BC2423 SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is 210 feet (64 m) SSW of the artesian well, 182.3 feet (55.6 m) SSW of Bench Mark No 4 1952, 14 feet (4 m) NNE of the centerline of the dim track path leading NW, and 0.5 foot (0.2 m) SSW of a witness post. The bench mark is 0.1 foot (0.03 m) below ground level, crimped to a copper-clad steel rod driven 26 feet (8 m) to refusal, and encased in a PVC pipe and concrete kickblock. BENCH MARK STAMPING: CRANDALL NO 3 1934 MONUMENTATION: Survey Disk VM#: 4967 AGENCY: PID#: BC2425 SETTING CLASSIFICATION: Concrete Foundation The bench mark is set in the top of a large, old concrete foundation at the NW corner of the park, 172 feet (52 m) north of an artesian well, 73 feet (22 m) east of the west end of a track road through the park, 24 feet (7 m) south of the river bank, and 2 feet (1 m) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 05/30/1989 Station ID: 8720004 SUPERCEDED DATE: 04/21/2003 Name: CRANDALL, ST MARYS RIVER FLORIDA NOAA Chart: 11502 Latitude: 30° 43.3' N USGS Quad: ST. MARYS Longitude: 81° 37.3' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 4 1952 MONUMENTATION: Survey Disk VM#: 4968 AGENCY: PID#: BC2424 SETTING CLASSIFICATION: Concrete Monument The bench mark is set in the top of a concrete monument, about 500 feet (152 m) NNW of a sign designating the Rayonier SE Timber Division Recreation Area, 212 feet (65 m) SSW of Bench Mark CRANDALL NO 3 1934, 182.3 feet (55.6 m) NE of Bench Mark 0004 C 1977, 58 feet (18 m) west of the centerline of the road, 45.5 feet (13.9 m) south of the artesian well, and 1 foot (0.3 m) ENE of a witness post. BENCH MARK STAMPING: 0004 B 1977 MONUMENTATION: Survey Disk VM#: 4969 AGENCY: PID#: BC2426 SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is 400 feet (122 m) east of Bench Mark CRANDALL NO 3 1934, 331.2 feet (100.9 m) east of Bench Mark No 4 1952, 110 feet (34 m) NW of a concrete picnic table, 9 feet (3 m) south of the river bank, and 3.8 feet (1.2 m) north of a large oak tree with witness sign. The bench mark is 0.3 foot (0.1 m) below ground level, crimped to a copper-clad steel rod driven 37 feet (11 m) to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 05/30/1989 Station ID: 8720004 SUPERCEDED DATE: 04/21/2003 Name: CRANDALL, ST MARYS RIVER FLORIDA NOAA Chart: 11502 Latitude: 30° 43.3' N USGS Quad: ST. MARYS Longitude: 81° 37.3' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0004 D 1977 MONUMENTATION: Survey Disk VM#: 4971 AGENCY: PID#: BC2422 SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is 301 feet (92 m) SSE of Bench Mark 0004 C 1977, 58 feet (18 m) NW of the centerline of the drive leading into the recreation area, 27.6 feet (8.4 m) west of the fork in Crandall Road, 7.2 feet (2.2 m) north of the sign designating the Rayonier SE Timber Division Recreation Area, and 0.5 foot (0.2 m) south of a witness post. The bench mark is 0.2 foot (0.1 m) below ground level, crimped to a copper-clad steel rod driven 48 feet (15 m), and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 05/30/1989 Station ID: 8720004 SUPERCEDED DATE: 04/21/2003 Name: CRANDALL, ST MARYS RIVER FLORIDA NOAA Chart: 11502 Latitude: 30° 43.3' N USGS Quad: ST. MARYS Longitude: 81° 37.3' W T I D A L D A T U M S Tidal datums at CRANDALL, ST MARYS RIVER based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: FEBRUARY-MAY 1978 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8720030 FERNANDINA Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (02/09/1978) = 6.50 MEAN HIGHER HIGH WATER MHHW = 5.33 MEAN HIGH WATER MHW = 5.07 MEAN TIDE LEVEL MTL = 2.64 MEAN LOW WATER MLW = 0.20 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (03/10/1978) = -1.40 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 0004 C 1977 14.89 9.82 CRANDALL NO 3 1934 13.62 8.55 NO 4 1952 12.64 7.57 0004 B 1977 12.08 7.01 0004 D 1977 14.70 9.63
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 05/30/1989 Station ID: 8720004 SUPERCEDED DATE: 04/21/2003 Name: CRANDALL, ST MARYS RIVER FLORIDA NOAA Chart: 11502 Latitude: 30° 43.3' N USGS Quad: ST. MARYS Longitude: 81° 37.3' 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.