U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 10 Station ID: 8728619 PUBLICATION DATE: 12/20/2023 Name: CAT POINT, APALACHICOLA BAY FL NOAA Chart: 11401 Latitude: 29° 43.4' N ( 29.72361) USGS Quad: APALACHICOLA Longitude: 84° 53.2' W ( -84.88667) The (TBM) Aquatrak is about 10.2 mi (16.4 km) south-southeast of Beverly, 5.8 mi (9.3 km) east of Apalachicola, 4.0 mi (6.5 km) southwest of Green Point, in section 6, township 9 south, range 6 west. To reach the (TBM) Aquatrak from the post office in Eastpoint, go west on U.S. Highway 98 for 0.5 mi (0.8 km) to the Intersection of Norvell Street on the right and Island Drive (State Road 300) on the left, turn left on Island Drive (State Road 300) and go south for 0.7 mi (1.1 km) to a side road left parallels Island Drive (State Road 300), turn left on the parallel road and go south for 0.15 mi (0.2 km) to the (TBM) Aquatrak on the left on a piling of the old ferry landing. Located about 90.0 ft (27.4 m) off-shore. Benchmarks are located in the vicinity along Island Drive (State Road 300) and U.S. Highway 98. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8619 B 1977 DESIGNATION: 872 8619 B TIDAL MONUMENTATION: Tidal Station disk VM#: 9848 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: AS0512 LATITUDE: 29° 43.4' N ( 29.72330) LONGITUDE: 84° 53.3' W ( -84.88833) The primary bench mark is a disk located 68.58 m (225.0 ft) WSW of bench mark 8619 A 1977, 60.96 m (200.0 ft) WNW of a ramp to the old ferry landing, 16.46 m (54.0 ft) east of a chain link fence which borders the approach to Bryant Patton Bridge to St. George Island, 7.83 m (25.7 ft) east of the centerline of a dirt road, and 0.09 m (0.3 ft) north of a metal witness post. The bench mark is crimped to the top of a copper-clad steel rod driven 12.19 m (40.0 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kick-block.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 10 Station ID: 8728619 PUBLICATION DATE: 12/20/2023 Name: CAT POINT, APALACHICOLA BAY FL NOAA Chart: 11401 Latitude: 29° 43.4' N ( 29.72361) USGS Quad: APALACHICOLA Longitude: 84° 53.2' W ( -84.88667) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8619 A 1977 DESIGNATION: 872 8619 A TIDAL MONUMENTATION: Tidal Station disk VM#: 9847 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 29° 43.4' N ( 29.72330) LONGITUDE: 84° 53.2' W ( -84.88670) The bench mark is a disk located NW of the abandoned ferry pier in a small grove of trees, 26 m (85 ft) WNW of the approximate high water line on the beach, 11.67 m (38.3 ft) ESE of the SE corner of the foundation of a destroyed building, 3.57 m (11.7 ft) SE of a two-trunked cedar tree, 2 m (7.0 ft) NNE of a 0.46 m (1.5 ft) diameter live oak tree, and 0.37 m (1.2 ft) WSW of a metal witness post. The bench mark is set 9 cm (0.3 ft) below ground level, crimped to the top of a copper-clad steel rod driven 12.2 m (40 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 8619 C 1977 DESIGNATION: 872 8619 C TIDAL MONUMENTATION: Tidal Station disk VM#: 9849 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: SETTING CLASSIFICATION: Concrete island OPUS PID: LATITUDE: 29° 43.4' N ( 29.72330) LONGITUDE: 84° 53.2' W ( -84.88670) The bench mark is a disk set in the north end of the concrete island of a toll booth for Bryant Patton Bridge to St. George Island, 4 m (13 ft) NNW of the NE corner of the toll booth, 3 m (10 ft) west of the center of the east lane of the toll booth, and 2.99 m (9.8 ft) east of the center of the west lane of the toll booth. NOTE: Mark not found in 1997 by US Power Squadron.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 10 Station ID: 8728619 PUBLICATION DATE: 12/20/2023 Name: CAT POINT, APALACHICOLA BAY FL NOAA Chart: 11401 Latitude: 29° 43.4' N ( 29.72361) USGS Quad: APALACHICOLA Longitude: 84° 53.2' W ( -84.88667) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8619 D 1977 DESIGNATION: 872 8619 D TIDAL MONUMENTATION: Tidal Station disk VM#: 9850 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 43.6' N ( 29.72670) LONGITUDE: 84° 53.3' W ( -84.88830) The bench mark is a disk set in a concrete monument north of the toll booth for Bryant Patton Bridge to St. George Island, 36 m (118 ft) NW of and across the road from a telephone pole, 14.17 m (46.5 ft) south of power pole R-46, 12.19 m (40.0 ft) west of the centerline of S-65, and 0.64 m (2.1 ft) east of a metal witness post, and level with the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 10 Station ID: 8728619 PUBLICATION DATE: 12/20/2023 Name: CAT POINT, APALACHICOLA BAY FL NOAA Chart: 11401 Latitude: 29° 43.4' N ( 29.72361) USGS Quad: APALACHICOLA Longitude: 84° 53.2' W ( -84.88667) T I D A L B E N C H M A R K S BENCH MARK STAMPING: C 689 2007 DESIGNATION: C 689 MONUMENTATION: Flange-encased Rod VM#: 19020 AGENCY: National Geodetic Survey (NGS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: DM4876 LATITUDE: 29° 44.7' N ( 29.74500) LONGITUDE: 84° 51.8' W ( -84.86333) The bench mark is a flange encased rod located 18.90 m (62.0 ft) north of the centerline of U.S. Highway 98, 12.50 m (41.0 ft) NE of a fire hydrant, 4.21 m (13.8 ft) east of the centerline of 7th Street, 0.58 km (1.9 ft) SE of an information sign (WATCH FOR CHILDREN), and 0.55 m (1.8 ft) SE of a carsonite witness post. The datum point is recessed 0.12 m (0.4 ft) below the level of the NGS logo cap, being the top of a stainless steel rod in a sleeve, driven to refusal at a depth of 17.37 m (57.0 ft) with a NGS logo cap flush with the ground and 0.30 m (1.0 ft) below the level of the highway, and encased in a 5-inch NGS logo cap containing a magnet.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 10 Station ID: 8728619 PUBLICATION DATE: 12/20/2023 Name: CAT POINT, APALACHICOLA BAY FL NOAA Chart: 11401 Latitude: 29° 43.4' N ( 29.72361) USGS Quad: APALACHICOLA Longitude: 84° 53.2' W ( -84.88667) T I D A L B E N C H M A R K S BENCH MARK STAMPING: B 689 2007 DESIGNATION: B 689 MONUMENTATION: Flange-encased Rod VM#: 19021 AGENCY: National Geodetic Survey (NGS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 29° 44.3' N ( 29.73833) LONGITUDE: 84° 52.5' W ( -84.87500) The bench mark is a flange-encased rod located about 146.30 m (480.0 ft) SW of the centerline of 1st Street, about 87.48 m (287.0 ft) NE of the centerline of the school road, 12.50 m (41.0 ft) north of the centerline of U.S. Highway 98, 3.14 m (10.3 ft) SE of the SE corner of a vacant metal building, 0.30 m (1.0 ft) north of the north edge of a concrete sidewalk, and 0.30 m (1.0 ft) south of a carsonite witness post. The datum point is recessed 0.06 m (0.2 ft) below the level of the logo cap, being the top of a stainless steel rod in a sleeve, driven to refusal at a depth of 19.20 m (63.0 ft) flush with the ground and 0.30 m (1.0 ft) below the level of the U.S. Highway 98, and encased in a 5-inch NGS logo cap (containing a magnet) flush with the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 10 Station ID: 8728619 PUBLICATION DATE: 12/20/2023 Name: CAT POINT, APALACHICOLA BAY FL NOAA Chart: 11401 Latitude: 29° 43.4' N ( 29.72361) USGS Quad: APALACHICOLA Longitude: 84° 53.2' W ( -84.88667) T I D A L B E N C H M A R K S BENCH MARK STAMPING: A 689 2007 DESIGNATION: A 689 MONUMENTATION: Flange-encased Rod VM#: 19022 AGENCY: National Geodetic Survey (NGS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 29° 44.2' N ( 29.73667) LONGITUDE: 84° 53.3' W ( -84.88833) The bench mark is a flange-encased rod located 12.31 m (40.4 ft) north of the centerline of U.S. Highway 98, 5.88 m (19.3 ft) east of the centerline of Norvell Street, 1.46 m (4.8 ft) SW of a wooden powerpole with five guy wires attached, 1.43 m (4.7 ft) SW of a carsonite witness post, and 0.58 m (1.9 ft) south of the south edge of a concrete sidewalk. The datum point is recessed 0.09 m (0.3 ft) below the level of the NGS logo cap, being the top of a stainless steel rod in a sleeve, driven to refusal at a depth of 13.11 m (43.0 ft) flush with the ground and 0.30 m (1.0 ft) below the level of the U.S. Highway 98, and encased in a 5-inch NGS logo cap (containing a magnet) flush with the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 10 Station ID: 8728619 PUBLICATION DATE: 12/20/2023 Name: CAT POINT, APALACHICOLA BAY FL NOAA Chart: 11401 Latitude: 29° 43.4' N ( 29.72361) USGS Quad: APALACHICOLA Longitude: 84° 53.2' W ( -84.88667) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8619 E DESIGNATION: 872 8619 E MONUMENTATION: Survey disk VM#: 19023 AGENCY: Florida Dept. of Transportation (FLDOT)IDB PID#: SETTING CLASSIFICATION: Concrete Guardrail OPUS PID: LATITUDE: 29° 43.4' N ( 29.72291) LONGITUDE: 84° 53.3' W ( -84.88786) The bench mark is a disk set flush in the top of the guardrail above the abutment at the NE end of the bridge, 7.04 m (23.1 ft) east of the centerline of the highway, 6.37 m (20.9 ft) south of the end of the asphalt pavement approaching the bridge, 1.83 m (6.0 ft) east of bench mark 8619 F, 0.85 m (2.8 ft) above the level of the State Highway 300, and 0.18 m (0.6 ft) south of the north end of the second guardrail section south of the end of the asphalt pavement approaching the bridge. BENCH MARK STAMPING: 8619 F DESIGNATION: 872 8619 F MONUMENTATION: Survey disk VM#: 19024 AGENCY: Florida Dept. of Transportation (FLDOT)IDB PID#: SETTING CLASSIFICATION: Concrete Guardrail OPUS PID: LATITUDE: 29° 43.4' N ( 29.72292) LONGITUDE: 84° 53.3' W ( -84.88810) The bench mark is a disk set flush in the top of the guardrail above the abutment at the NW end of the bridge, 14.02 m (46.0 ft) west of bench mark 8619 E, 6.95 m (22.8 ft) west of the centerline of the highway, 6.40 m (21.0 ft) south of the end of the asphalt pavement approaching the bridge, 0.85 m (2.8 ft) above the level of the State Highway 300, and 0.18 m (0.6 ft) south of the north end of the second guardrail section south of the end of the asphalt pavement approaching the bridge.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 10 Station ID: 8728619 PUBLICATION DATE: 12/20/2023 Name: CAT POINT, APALACHICOLA BAY FL NOAA Chart: 11401 Latitude: 29° 43.4' N ( 29.72361) USGS Quad: APALACHICOLA Longitude: 84° 53.2' W ( -84.88667) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8619 G 2018 DESIGNATION: 872 8619 G MONUMENTATION: Flange-encased Rod VM#: 24316 AGENCY: National Geodetic Survey (NGS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 29° 44.2' N ( 29.73588) LONGITUDE: 84° 53.5' W ( -84.89203) The bench mark located 16.80 m (55.0 ft) west of the extended centerline of the west entrance to (Badcock and more) furniture store located at U.S. mail address 197 U.S. highway 98, 14.80 m (48.5 ft) south of the approximate centerline of U.S. highway 98, 13.60 m (44.5 ft) east of the west chain link fence corner, 1.25 m (4.1 ft) north of a chain link fence and 1.20 m (4.1 ft) north of a carsonite witness post. The bench mark is a stainless steel rod driven to refusal at a depth of 17.2 m (56.5 ft), recessed 0.09m (0.3 ft) below the level of the ground and 0.5 m (1.5 ft) below the level of U.S. highway 98, the datum point is recessed 0.15m (0.5 ft) below the level of the (NGS) logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 10 Station ID: 8728619 PUBLICATION DATE: 12/20/2023 Name: CAT POINT, APALACHICOLA BAY FL NOAA Chart: 11401 Latitude: 29° 43.4' N ( 29.72361) USGS Quad: APALACHICOLA Longitude: 84° 53.2' W ( -84.88667) T I D A L D A T U M S Tidal datums at CAT POINT, APALACHICOLA BAY based on: LENGTH OF SERIES: 6 MONTHS TIME PERIOD: March 2021 - August 2021 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8728690 APALACHICOLA, APALACHICOLA RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: North American Vertical Datum NAVD88 = 1.166 MEAN HIGHER HIGH WATER MHHW = 0.613 MEAN HIGH WATER MHW = 0.569 MEAN TIDE LEVEL MTL = 0.359 MEAN SEA LEVEL MSL = 0.348 MEAN LOW WATER MLW = 0.150 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8619 B 1977 2.929 2.360 8619 A 1977 2.213 1.644 8619 C 1977 2.909 2.340 8619 D 1977 1.998 1.429 C 689 2007 3.848 3.279 B 689 2007 2.990 2.421 A 689 2007 5.253 4.684 8619 E 8.781 8.212 8619 F 7.937 7.368 8619 G 2018 6.081 5.512 Foot Notes: Bench marks A 689 2007, B 689 2007, and C 689 2007 are based on one differential leveling connection and do not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 10 of 10 Station ID: 8728619 PUBLICATION DATE: 12/20/2023 Name: CAT POINT, APALACHICOLA BAY FL NOAA Chart: 11401 Latitude: 29° 43.4' N ( 29.72361) USGS Quad: APALACHICOLA Longitude: 84° 53.2' W ( -84.88667) 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.