U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8728786 PUBLICATION DATE: 03/10/2011 Name: ELEVEN MILE, ST. VINCENT SOUND FL NOAA Chart: 11401 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: INDIAN PASS Longitude: 85° 9.2' W ( -85.15330) To reach the tidal bench marks from the Franklin County Courthouse in Appalachicola proceed west on U.S. Highway 98 for 13.04 km (8.1 mi) to the Y-junction of County Road C-30, then west on County Road C-30 for 4.83 km (3.0 mi) to the dirt drive to the Eleven Mile Fishery, then south on the drive for 0.32 km (0.2 mi) to the fish house. The bench marks are along County Road C-30 and the drive to the fish house. The tide gage and staff were located at the Eleven Mile Fishery dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8786 A 1977 DESIGNATION: 872 8786 A TIDAL MONUMENTATION: Tidal Station disk VM#: 9884 AGENCY: National Ocean Survey (NOS) IDB PID#: AS0872 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 29° 42.4' N ( 29.70670) LONGITUDE: 85° 9.2' W ( -85.15330) The primary bench mark is a disk located 17.68 m (58.0 ft) SE of the NE corner of the easterly dock, 7.01 m (23.0 ft) ENE of the centerline the dirt road, 1.98 m (6.5 ft) SE of utility pole No. 56X 2661R, and 0.61 m (2.0 ft) west of a witness post. The bench mark is set at ground level, crimped to the top of a copper-clad steel rod driven 14.63 m (48.0 ft), and encased in a PVC pipe and concrete kick-block.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 8 Station ID: 8728786 PUBLICATION DATE: 03/10/2011 Name: ELEVEN MILE, ST. VINCENT SOUND FL NOAA Chart: 11401 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: INDIAN PASS Longitude: 85° 9.2' W ( -85.15330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8786 C 1977 DESIGNATION: 872 8786 C TIDAL MONUMENTATION: Tidal Station disk VM#: 9886 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: AS0870 SETTING CLASSIFICATION: Concrete Post OPUS PID: LATITUDE: 29° 42.6' N ( 29.71000) LONGITUDE: 85° 9.3' W ( -85.15500) The bench mark is a disk set in the top of a concrete monument, 90.22 m (296.0 ft) north of bench mark 8786 B 1977, 12.80 m (42.0 ft) SE of powerline pole No. 56X 1859R, 10.36 m (34.0 ft) NW of a 0.46 m (1.5 ft) diameter palm tree, 7.92 m (26.0 ft) ENE of the centerline of the dirt road drive, 1.22 m (4.0 ft) WNW of a witness post, and at ground level. BENCH MARK STAMPING: 8786 E 1977 DESIGNATION: 872 8786 E TIDAL MONUMENTATION: Tidal Station disk VM#: 9888 AGENCY: National Ocean Survey (NOS) IDB PID#: AS0520 SETTING CLASSIFICATION: Concrete Post OPUS PID: LATITUDE: 29° 42.6' N ( 29.71000) LONGITUDE: 85° 9.2' W ( -85.15333) The bench mark is a disk set in a concrete monument, 58.83 m (193.0 ft) ENE of the junction of the dirt drive and County Road C-30, 11.77 m (38.6 ft) NNW of the centerline of County Road C-30, 6.71 m (22.0 ft) SE of a powerline pole, 0.49 m (1.6 ft) SE of a witness post, and at ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8728786 PUBLICATION DATE: 03/10/2011 Name: ELEVEN MILE, ST. VINCENT SOUND FL NOAA Chart: 11401 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: INDIAN PASS Longitude: 85° 9.2' W ( -85.15330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: Y 295 1967 DESIGNATION: Y 295 MONUMENTATION: Bench Mark disk VM#: 19030 AGENCY: US Coast & Geodetic Survey (USC&GS) IDB PID#: AS0120 SETTING CLASSIFICATION: Copper-Clad Steel Rod OPUS PID: LATITUDE: 29° 43.2' N ( 29.72000) LONGITUDE: 85° 6.5' W ( -85.10833) The bench mark is a disk located in the Y junction formed by the U.S. Hwy 98 and State Hwy S 30, 31.24 m (102.5 ft) SW of the center line of Hwy 98, 16.61 m (54.5 ft) north of the center line of Hwy S 30, 16.46 m (54.0 ft) west of the center line of a connecting road in line with a row of large power line poles, 0.18 m (0.6 ft) south of a metal witness post, about level with the state highway, and 1.22 m (4.0 ft) below the level of the U.S. highway. The bench mark is a disk on the top of a copper coated steel rod projecting 0.09 m (0.3 ft) above the level of the ground and protected by a 4-inch metal pipe which projects 0.18 m (0.6 ft) above the level of the ground. The rod was driven to a depth of 18.90 m (62.0 ft). NOTE: Witness post destroyed by machinery clearing power line right-of-way.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8728786 PUBLICATION DATE: 03/10/2011 Name: ELEVEN MILE, ST. VINCENT SOUND FL NOAA Chart: 11401 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: INDIAN PASS Longitude: 85° 9.2' W ( -85.15330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: G 689 2007 DESIGNATION: G 689 MONUMENTATION: Survey disk VM#: 19031 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: SETTING CLASSIFICATION: Concrete Head Wall OPUS PID: LATITUDE: 29° 42.9' N ( 29.71500) LONGITUDE: 85° 7.4' W ( -85.12333) The bench mark is a disk set flush in the top of a concrete headwall of a 36-inch pipe culvert beneath County Road C-30 and 0.61 m (2.0 ft) below the level of the C-30, located 7.68 m (25.2 ft) SSE of the centerline of county road C-30, 2.56 m (8.4 ft) west of the east end of the headwall, 1.16 m (3.8 ft) east of a carsonite witness post, and 1.13 m (3.7 ft) east of the west end of the headwall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8728786 PUBLICATION DATE: 03/10/2011 Name: ELEVEN MILE, ST. VINCENT SOUND FL NOAA Chart: 11401 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: INDIAN PASS Longitude: 85° 9.2' W ( -85.15330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: F 689 2007 DESIGNATION: F 689 MONUMENTATION: Flange-encased Rod VM#: 19032 AGENCY: National Geodetic Survey (NGS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 29° 42.8' N ( 29.71333) LONGITUDE: 85° 8.3' W ( -85.13833) The bench mark is a flange encase rod located 21.92 m (71.9 ft) SW of the top center of a 36-inch pipe culvert, 14.17 m (46.5 ft) south of the centerline of County Road C-30, 7.50 m (24.6 ft) west of the centerline of 10 Mile Road, and 0.70 m (2.3 ft) east of a carsonite witness post. The datum point is set flush with the ground and 0.91 m (3.0 ft) below the level of County Road C-30, being the top of a stainless steel rod driven to refusal at a depth of 21.64 m (71.0 ft), in a sleeve, and recessed 0.15 m (0.5 ft) below the logo cap. NOTE: A magnet was placed inside of the NGS logo cap. BENCH MARK STAMPING: 8786 F 2007 DESIGNATION: 872 8786 F TIDAL MONUMENTATION: Tidal Station disk VM#: 19033 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: SETTING CLASSIFICATION: Culvert Head Wall OPUS PID#: DM4905 LATITUDE: 29° 42.6' N ( 29.71000) LONGITUDE: 85° 9.4' W ( -85.15667) The bench mark is a disk set flush in the top of a concrete headwall for twin 48-inch pipe culverts beneath County Road C-30, located 16.00 m (52.5 ft) NNW of bench mark 8786 G 2007, 7.68 m (25.2 ft) NNW of the centerline of C-30, 3.47 m (11.4 ft) WSW of a carsonite witness post, and 0.61 m (2.0 ft) below the level of the road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8728786 PUBLICATION DATE: 03/10/2011 Name: ELEVEN MILE, ST. VINCENT SOUND FL NOAA Chart: 11401 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: INDIAN PASS Longitude: 85° 9.2' W ( -85.15330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8786 G 1977 DESIGNATION: 872 8786 G TIDAL MONUMENTATION: Tidal Station disk VM#: 19034 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: SETTING CLASSIFICATION: Culvert Head Wall OPUS PID: LATITUDE: 29° 42.6' N ( 29.71000) LONGITUDE: 85° 9.3' W ( -85.15500) The bench mark is a disk set flush in the top of a concrete headwall for twin 48-inch pipe culverts beneath C-30, located 16.00 m (52.5 ft) SSE of bench mark 8786 F 2007, 8.32 m (27.3 ft) SSE of the centerline of the county road, 3.57 m (11.7 ft) NE of a carsonite witness post, and 0.30 m (1.0 ft) below the level of the road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 8 Station ID: 8728786 PUBLICATION DATE: 03/10/2011 Name: ELEVEN MILE, ST. VINCENT SOUND FL NOAA Chart: 11401 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: INDIAN PASS Longitude: 85° 9.2' W ( -85.15330) T I D A L D A T U M S Tidal datums at ELEVEN MILE, ST. VINCENT SOUND based on: LENGTH OF SERIES: 6 MONTHS TIME PERIOD: December 1977 - May 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8729840 PENSACOLA, PENSACOLA BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.509 MEAN HIGH WATER MHW = 0.468 MEAN TIDE LEVEL MTL = 0.297 North American Vertical Datum NAVD88 = 0.279 MEAN SEA LEVEL MSL = 0.274 MEAN LOW WATER MLW = 0.126 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8786 A 1977 0.998 0.530 8786 C 1977 1.710 1.242 8786 E 1977 3.064 2.596 Y 295 1967 4.434 3.966 G 689 2007 4.685 4.217 F 689 2007 4.340 3.872 8786 F 2007 2.451 1.983 8786 G 1977 2.508 2.040 Foot Notes: Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control standards for Second Order, Class 1 leveling. It is advised that a confirmation set of levels be established for bench marks 8786 F 2007, 8786 G 1977, F 689 2007, G 689 2007, and Y 295 1967 to verify height differences before using tidal bench mark elevation information.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 8 Station ID: 8728786 PUBLICATION DATE: 03/10/2011 Name: ELEVEN MILE, ST. VINCENT SOUND FL NOAA Chart: 11401 Latitude: 29° 42.4' N ( 29.70670) USGS Quad: INDIAN PASS Longitude: 85° 9.2' W ( -85.15330) 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.