U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8720503 PUBLICATION DATE: 11/04/2020 Name: RED BAY POINT, ST JOHNS RIVER FL NOAA Chart: 11492 Latitude: 29° 58.9' N ( 29.98167) USGS Quad: GREEN COVE SPRINGS Longitude: 81° 38.1' W ( -81.63417) To reach the tide gauge from the junction of U.S. Highway 17 (Orange Avenue) and State Road 16 (Ferris Street) in Green Cove Springs, go south on U.S. Highway 17 and State Road 16 for 0.97 km (0.6 mi) to the junction of State Road 16 East on the left, turn left on State Road 16 and go east for 3.78 km (2.4 mi) to the junction of Shands Pier Road on the left, turn left on Shands Pier Road and go north for 0.56 km (0.4 mi) to the south end of Shands Pier, go northeast on Shands Pier for 118.87 m (390.0 ft) where the tide gauge is located on the right (southeast side of Pier). This location is about 59.44 m (195.0 ft) southwest of the break in the pier. Bench marks are located along Shands Pier Road and State Road 16. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0503 B 1995 DESIGNATION: 872 0503 B TIDAL MONUMENTATION: Flange-encased Rod VM#: 13490 AGENCY: National Ocean Service (NOS) IDB PID#: DE6867 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 29° 58.8' N ( 29.97972) LONGITUDE: 81° 38.1' W ( -81.63533) The primary bench mark is a flange-encased rod located 96.01 m (315.0 ft) SSW of the S end of the Shands Pier, 36.88 m (121.00 ft) NE of the approximate centerline of Susan Drive (a paved road leading E), 22.43 m (73.6 ft) SE of the approximate centerline of Shands Pier Road, 0.46 m (1.5 ft) NW of a 2.44 m (8.0 ft) tall fence and 0.43 m (1.40 ft) NW of a carsonite witness post. The datum point is recessed 9.14 cm (0.3 ft) below the level of the NGS logo cap, being the top of a stainless steel rod driven to refusal at a depth of 21.12 m (69.3 ft) encased in a 5-inch logo cap flush with the ground. Note: The top of the logo cap is missing.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8720503 PUBLICATION DATE: 11/04/2020 Name: RED BAY POINT, ST JOHNS RIVER FL NOAA Chart: 11492 Latitude: 29° 58.9' N ( 29.98167) USGS Quad: GREEN COVE SPRINGS Longitude: 81° 38.1' W ( -81.63417) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0503 C 1995 DESIGNATION: 872 0503 C TIDAL MONUMENTATION: Flange-encased Rod VM#: 13491 AGENCY: National Ocean Service (NOS) IDB PID#: DE6869 SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DE6869 LATITUDE: 29° 58.7' N ( 29.97828) LONGITUDE: 81° 38.2' W ( -81.63678) The bench mark is a flange-encased rod located near the intersection of Shands Pier Road and Susan Drive, 10.00 m (32.8 ft) NW of the approximate centerline of Shands Pier Road, 5.47 m (18.6 ft) NE of the approximate centerline of a dirt road, 3.66 m (12.0 ft) NE of a metal gate, 0.37 m (1.2 ft) SE of a barbwire fence and 0.30 m (1.0 ft) SE of a carsonite witness post. The datum point is recessed 9.14 cm (0.3 ft) below the level of the NGS logo cap, being the top of a stainless steel rod driven to refusal at a depth of 21.95 m (72 ft) encased in a 5-inch logo cap flush with the ground. BENCH MARK STAMPING: 0503 D 1995 DESIGNATION: 872 0503 D TIDAL MONUMENTATION: Tidal Station disk VM#: 13492 AGENCY: National Ocean Service (NOS) IDB PID#: DE6870 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 58.6' N ( 29.97703) LONGITUDE: 81° 38.3' W ( -81.63794) The bench mark is a disk set in the top of a concrete monument flush with the ground located at the intersection of State Road 16 and Shands Pier Road, 19.20 m (63.0 ft) N of the centerline of State Road 16, 11.16 m (36.6 ft) E of the approximate centerline of Shands Pier Road and 0.76 m (2.5 ft) E of a wooden power pole and carsonite witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8720503 PUBLICATION DATE: 11/04/2020 Name: RED BAY POINT, ST JOHNS RIVER FL NOAA Chart: 11492 Latitude: 29° 58.9' N ( 29.98167) USGS Quad: GREEN COVE SPRINGS Longitude: 81° 38.1' W ( -81.63417) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0503 E 1995 DESIGNATION: 872 0503 E TIDAL MONUMENTATION: Tidal Station disk VM#: 13493 AGENCY: National Ocean Service (NOS) IDB PID#: DE6871 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 29° 58.6' N ( 29.97694) LONGITUDE: 81° 38.4' W ( -81.63919) The bench mark is a disk set in the top of a concrete monument flush with the ground located along State Road 16, 18.35 m (60.2 ft) S of the centerline of State Road 16, 14.33 m (47.0 ft) E of the centerline of the entrance drive to the John P. Hall, Sr. Nature Preserve (gate no. BC05), and 21.34 cm (0.7 ft) N of a wooden fence line with a carsonite witness post. BENCH MARK STAMPING: 0503 F 2004 DESIGNATION: 872 0503 F MONUMENTATION: Tidal Station disk VM#: 17775 AGENCY: FL Department of Environmental Protection (FLDEP) IDB PID#: DL5344 SETTING CLASSIFICATION: Concrete sidewalk OPUS PID#: DL5344 LATITUDE: 29° 58.8' N ( 29.98069) LONGITUDE: 81° 38.1' W ( -81.63492) The bench mark is a disk set in the top of a concrete sidewalk entrance of the pier, 18.29 m (60.0 ft) NE of the security chain at the entrance to the pier, 3.05 m (10.0 ft) NW of the approximate centerline of the 6.10 m (20.0 ft) wooden deck of the pier, 0.27 m (0.9 ft) NW of the wooden deck of the pier and 0.06 m (0.3 ft) S of the 7-inch concrete curb.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8720503 PUBLICATION DATE: 11/04/2020 Name: RED BAY POINT, ST JOHNS RIVER FL NOAA Chart: 11492 Latitude: 29° 58.9' N ( 29.98167) USGS Quad: GREEN COVE SPRINGS Longitude: 81° 38.1' W ( -81.63417) T I D A L D A T U M S Tidal datums at RED BAY POINT, ST JOHNS RIVER based on: LENGTH OF SERIES: 3 YEARS TIME PERIOD: 11/03-10/05, 05/14-04/15 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720357 I-295 BRIDGE, WEST END, ST JOHNS RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (09/27/2004) = 1.233 MEAN HIGHER HIGH WATER MHHW = 0.306 MEAN HIGH WATER MHW = 0.292 North American Vertical Datum NAVD88 = 0.219 MEAN SEA LEVEL MSL = 0.166 MEAN TIDE LEVEL MTL = 0.161 MEAN LOW WATER MLW = 0.029 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (04/14/2004) = -0.367 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0503 B 1995 1.490 1.198 0503 C 1995 2.017 1.725 0503 D 1995 2.578 2.286 0503 E 1995 3.382 3.090 0503 F 2004 1.499 1.207
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8720503 PUBLICATION DATE: 11/04/2020 Name: RED BAY POINT, ST JOHNS RIVER FL NOAA Chart: 11492 Latitude: 29° 58.9' N ( 29.98167) USGS Quad: GREEN COVE SPRINGS Longitude: 81° 38.1' W ( -81.63417) 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.