U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8720232 PUBLICATION DATE: 03/25/2010 Name: PABLO CREEK ENTRANCE FL NOAA Chart: 11490 Latitude: 30° 22.6' N ( 30.37670) USGS Quad: MAYPORT Longitude: 81° 26.9' W ( -81.44830) To reach the tidal bench marks from the Post Office in Mayport, proceed SW on Highway A1A for approximately 1.4 km (0.9 mi) to a sand road leading west onto the sand spit known as Little Jetties, then turn right and proceed west on the sand road for 1.3 km (0.8 mi), then proceed south to the water's edge. The bench marks are along the sand spit. The tide gage and staff were on a small wooden offshore platform, 128 m (420 ft) SW of Bench Mark 0232 B 1977, and 76 m (250 ft) NNE of the two side by side range markers. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0232 E 1982 DESIGNATION: 872 0232 E TIDAL MONUMENTATION: Tidal Station disk VM#: 10571 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2417 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 22.7' N ( 30.37833) LONGITUDE: 81° 26.9' W ( -81.44889) The primary bench mark is a disk located 297.2 m (975.0 ft) west of a steel gate on the west side of the western most parking area of the park, 80.5 m (264.0 ft) west of bench mark 0232 D 1982, 28.7 m (94.3 ft) WSW of the intersection of the main sand road and four track roads which converge, 7.3 m (24.0 ft) north of the centerline of the main sand road, 6.3 m (20.8 ft) SW of the centerline of a track road, 5.3 m (17.5 ft) east of a twin-trunked cedar tree with 25.4 cm (10.0 in) and 30.5 cm (12.0 in) trunks (the tree is 12.2 m (40.0 ft) east of another twin-trunked cedar tree that is surrounded by 4 cabbage palm trees), 2.7 m (9.0 ft) south of the middle of 3 small cabbage palm trees ranging in height from 1.8 to 3.0 m (6.0 to 10.0 ft) (the distance between the outside trees is 2.4 m (8.0 ft)), 0.3 m (1.0 ft) north of a carsonite witness post and 0.3 m (1.0 ft) south of a second carsonite witness post. The bench mark is crimped to the top of a stainless steel rod driven to refusal at a depth of 6.1 m (20.0 ft) encased in a concrete kickblock flush with the ground. NOTE: A magnet was buried at the south side of the mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8720232 PUBLICATION DATE: 03/25/2010 Name: PABLO CREEK ENTRANCE FL NOAA Chart: 11490 Latitude: 30° 22.6' N ( 30.37670) USGS Quad: MAYPORT Longitude: 81° 26.9' W ( -81.44830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: Z 324 1970 DESIGNATION: Z 324 MONUMENTATION: Bench Mark disk VM#: 10565 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BC0710 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 22.9' N ( 30.38167) LONGITUDE: 81° 26.3' W ( -81.43833) The bench mark is a disk set in the top of a concrete monument projecting 0.1 m (0.4 ft) above the level of the ground, in the center of a triangle formed by three 10.2 cm (4.0 in) steel pipes, 43.9 m (144.0 ft) south of a 76.2 cm (30.0 in) steel pipeline at the south shore of the St. Johns River, 31.7 m (104.0 ft) ENE of the most northern 27.9 cm (11.0 in) diameter steel gate post at the entrance to the Helen Cooper Floyd Little Jetties Park, 27.0 m (89.0 ft) west of the centerline of Ocean Street (U.S. Highway A1A), 19.1 m (62.5 ft) north of the centerline of the sand road, near the south side of six small cedar trees, 9.0 m (31.0 ft) east of the centerline of a road leading NW to St. Johns River, 1.0 m (2.0 ft) SE of a carsonite witness post, 1.0 m (2.0 ft) below the level of the highway, and 0.1 m (0.3 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8720232 PUBLICATION DATE: 03/25/2010 Name: PABLO CREEK ENTRANCE FL NOAA Chart: 11490 Latitude: 30° 22.6' N ( 30.37670) USGS Quad: MAYPORT Longitude: 81° 26.9' W ( -81.44830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0232 D 1982 DESIGNATION: 872 0232 D TIDAL MONUMENTATION: Tidal Station disk VM#: 10570 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2416 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 22.7' N ( 30.37833) LONGITUDE: 81° 26.9' W ( -81.44806) The bench mark is a disk set in the top of a concrete monument flush with the gorund, 0.3 km (0.2 mi) west of bench mark 0232 C 1982, 161.2 m (529.0 ft) west of a steel gate on the west side of the westernmost parking area of the park, 136.0 m (446.0 ft) east of bench mark 0232 E 1982, 22.1 m (72.5 ft) NE of an 45.7 cm (18.0 in) cabbage palm tree on the south side of the sand road, 11.2 m (36.8 ft) west of the centerline of a track road leading north, 7.9 m (26.0 ft) north of the centerline of the sand road, 9.2 m (30.3 ft) east of the centerline of a track road leading NW, 5.9 m (19.2 ft) ESE of the center of two cabbage palms 0.3 m (1.0 ft) north of a carsonite witness post and 0.3 m (1.0 ft) south of a second carsonite witness post, and 9.0 cm (0.3 ft) above ground level. NOTE: A magnet was buried on the south side of the mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8720232 PUBLICATION DATE: 03/25/2010 Name: PABLO CREEK ENTRANCE FL NOAA Chart: 11490 Latitude: 30° 22.6' N ( 30.37670) USGS Quad: MAYPORT Longitude: 81° 26.9' W ( -81.44830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0232 F 2004 DESIGNATION: 872 0232 F MONUMENTATION: Bench Mark disk VM#: 19298 AGENCY: FL Department of Environmental Protection (FLDEP) IDB PID#: DL5752 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 22.8' N ( 30.37944) LONGITUDE: 81° 26.6' W ( -81.44361) The bench mark is a disk set in the top of a round concrete monument flush with the ground, 23.0 m (75.3 ft) west of the southwest corner of a concrete sidewalk leading to a fishing pier at the St Johns River, 23.0 m (75.0 ft) north of the centerline of the sand road, 0.9 m (2.8 ft) north of a steel guardrail and 0.6 m (2.1 ft) north of a carsonite witness post. NOTE: A magnet was buried at the south side of the mark. BENCH MARK STAMPING: 0232 G 2004 DESIGNATION: 872 0232 G MONUMENTATION: Flange-encased Rod VM#: 19299 AGENCY: National Geodetic Survey (NGS) IDB PID#: DL5753 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 22.7' N ( 30.37861) LONGITUDE: 81° 26.7' W ( -81.44472) The bench mark is a flange-encased rod located 59.3 m (194.5 ft) SSW of a steel tower for a green navigation marker, 6.7 m (22.0 ft) ESE of the east post of a wetlands conservation area sign, 1.0 m (3.3 ft) south of a steel guardrail, and 0.5 m (1.8 ft) north of a carsonite witness post. The datum point is recessed 0.1 m (0.4 ft) below the level of the NGS logo cap, being the top of a stainless steel rod driven to refusal at a depth of 13.4 m (44.0 ft) encased in a 5-inch NGS logo cap flush with the ground. NOTE: A magnet was buried on the south side of the mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8720232 PUBLICATION DATE: 03/25/2010 Name: PABLO CREEK ENTRANCE FL NOAA Chart: 11490 Latitude: 30° 22.6' N ( 30.37670) USGS Quad: MAYPORT Longitude: 81° 26.9' W ( -81.44830) T I D A L D A T U M S Tidal datums at PABLO CREEK ENTRANCE based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: September 1977 - September 1977 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720220 MAYPORT (FERRY DEPOT), SAINT JOHNS RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.280 MEAN HIGH WATER MHW = 1.200 North American Vertical Datum NAVD88 = 0.763 MEAN SEA LEVEL MSL = 0.640 MEAN TIDE LEVEL MTL = 0.615 MEAN LOW WATER MLW = 0.030 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0232 E 1982 2.791 1.591 Z 324 1970 2.152 0.952 0232 D 1982 2.451 1.251 0232 F 2004 1.967 0.767 0232 G 2004 1.972 0.772
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8720232 PUBLICATION DATE: 03/25/2010 Name: PABLO CREEK ENTRANCE FL NOAA Chart: 11490 Latitude: 30° 22.6' N ( 30.37670) USGS Quad: MAYPORT Longitude: 81° 26.9' W ( -81.44830) 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.