U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8728711 PUBLICATION DATE: 07/14/2003 Name: APALACHICOLA RIVER FL NOAA Chart: 11401 Latitude: 29° 45.8' N ( 29.76330) USGS Quad: JACKSON RIVER Longitude: 85° 2.0' W ( -85.03330) To reach the tidal bench marks from U.S. Highway 98 and County Road C-384 (12th Street) in Apalachicola, proceed 6.6 km (4.1 mi) NW on County Road C-384 to the Apalachicola Northern Railroad crossing, then continue north along the railroad to the bridge over the Apalachicola River. The bench marks are located south of the railroad bridge along Krista Road on the west side of the tracks. The tide gage and staff were located on the south bridge fender on the west west side of the tracks. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8711 A 1978 DESIGNATION: 872 8711 A TIDAL MONUMENTATION: Survey disk VM#: 9869 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: AS0904 SETTING CLASSIFICATION: Concrete bridge foundation OPUS PID: LATITUDE: 29° 45.9' N ( 29.76500) LONGITUDE: 85° 2.0' W ( -85.03330) The primary bench mark is a disk set in the SW corner of the concrete foundation for the west bridge pier at the south end of the Apalachicola Northern Railroad bridge over the Apalachicola River, 7.99 m (26.2 ft) west of the south end of the swing span, 2.19 m (7.2 ft) south of the north edge of the foundation, 1.13 m (3.7 ft) NE of the SW corner of the foundation, and 4.51 m (14.8 ft) below the level of the tracks.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8728711 PUBLICATION DATE: 07/14/2003 Name: APALACHICOLA RIVER FL NOAA Chart: 11401 Latitude: 29° 45.8' N ( 29.76330) USGS Quad: JACKSON RIVER Longitude: 85° 2.0' W ( -85.03330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: A 296 1967 DESIGNATION: A 296 MONUMENTATION: Tidal Station disk VM#: 9868 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AS0145 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 29° 45.5' N ( 29.75830) LONGITUDE: 85° 2.0' W ( -85.03330) The bench mark is a disk located near the County Road C-384 crossing of the Apalachicola Northern Railroad, 250 m (820 ft) SE of bench mark 8711 D 1978, 43 m (142 ft) NW of the center of the crossing of the highway and the main tracks, 1 m (3 ft) south of utility pole #56X1493R, and 0.15 m (0.5 ft) NW of a witness post. The bench mark is set 0.76 m (2.5 ft) below the level of the tracks, crimped to the top of a copper-clad steel rod driven 20 m (64 ft), and encased in a 4-inch metal pipe projecting 0.12 m (0.4 ft) above ground. BENCH MARK STAMPING: 8711 B 1978 DESIGNATION: 872 8711 B MONUMENTATION: Survey disk VM#: 9870 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: AS0903 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 45.7' N ( 29.76170) LONGITUDE: 85° 2.1' W ( -85.03500) The bench mark is a disk set in the top of a concrete monument, 0.2 km (0.1 mi) NE on Krista Road from its intersection with County Road C-384, 30 m (100 ft) east of the centerline of Krista Road, 21.34 m (70.0 ft) south of the SE corner of Roland Wilson's house, 14.17 m (46.5 ft) west of the west rail of the Apalachicola Northern Railroad, 2.59 m (8.5 ft) north of a fence corner of a yard with a small house and trailer, 0.3 m (1 ft) west of a witness post, and 0.06 m (0.2 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8728711 PUBLICATION DATE: 07/14/2003 Name: APALACHICOLA RIVER FL NOAA Chart: 11401 Latitude: 29° 45.8' N ( 29.76330) USGS Quad: JACKSON RIVER Longitude: 85° 2.0' W ( -85.03330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8711 C 1978 DESIGNATION: 872 8711 C MONUMENTATION: Survey disk VM#: 9871 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: AS0902 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 29° 45.7' N ( 29.76170) LONGITUDE: 85° 2.1' W ( -85.03500) The bench mark is a disk located 0.1 km (0.05 mi) NE along Krista Road from its intersection with County Road 384, 30 m (100 ft) west and 84 m (274 ft) south of bench mark 8711 B 1978, 13 m (43 ft) SSW of a 1 m (2 ft) diameter double-trunk magnolia tree, 6 m (20 ft) east of the centerline of Krista Road, 2.23 m (7.3 ft) north of a 0.30 m (1.0 ft) diameter water oak tree, and 1.37 m (4.5 ft) west of a witness post. The bench mark is set 6 cm (0.2 ft) above ground level, crimped to the top of a copper-clad steel rod driven 14.6 m (48 ft) to substantial resistance, and encased in a 4-inch steel pipe and concrete kickblock. BENCH MARK STAMPING: 8711 D 1978 DESIGNATION: 872 8711 D MONUMENTATION: Survey disk VM#: 9872 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: AS0901 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 45.7' N ( 29.76170) LONGITUDE: 85° 2.1' W ( -85.03500) The bench mark is a disk set in the top of a concrete monument, 99 m (324 ft) SW of bench mark 8711 C 1978, 12.80 m (42.0 ft) NE of powerline pole #56X-1495R, 11 m (36 ft) NW of the centerline of Krista Road, 6.40 m (21.0 ft) NE of the centerline of County Road C-384, 2.83 m (9.3 ft) SW of a powerline anchor pole, 1.43 m (4.7 ft) SW of a witness post, and 6 cm (0.2 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8728711 PUBLICATION DATE: 07/14/2003 Name: APALACHICOLA RIVER FL NOAA Chart: 11401 Latitude: 29° 45.8' N ( 29.76330) USGS Quad: JACKSON RIVER Longitude: 85° 2.0' W ( -85.03330) T I D A L D A T U M S Tidal datums at APALACHICOLA RIVER based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: December 1981 - November 1982 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8728690 APALACHICOLA, APALACHICOLA RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (02/03/1978) = 0.950 MEAN HIGHER HIGH WATER MHHW = 0.412 MEAN HIGH WATER MHW = 0.387 MEAN TIDE LEVEL MTL = 0.241 MEAN SEA LEVEL MSL = 0.232 North American Vertical Datum NAVD88 = 0.127 MEAN LOW WATER MLW = 0.094 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (12/11/1981) = -0.470 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8711 A 1978 1.151 0.764 A 296 1967 1.766 1.379 8711 B 1978 1.546 1.159 8711 C 1978 1.969 1.582 8711 D 1978 1.959 1.572
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8728711 PUBLICATION DATE: 07/14/2003 Name: APALACHICOLA RIVER FL NOAA Chart: 11401 Latitude: 29° 45.8' N ( 29.76330) USGS Quad: JACKSON RIVER Longitude: 85° 2.0' W ( -85.03330) 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 NGS's Integrated Data Base (IDB PID) provides geodetic datum based on traditionally leveled and bluebooked ties to the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/. The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/. 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.