U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8728973 PUBLICATION DATE: 02/05/2004 Name: WETAPPO CREEK, EAST BAY FL NOAA Chart: 11389 Latitude: 30° 2.3' N ( 30.03830) USGS Quad: ALLANTON Longitude: 85° 23.6' W ( -85.39330) To reach the tidal bench marks from the intersection of U.S. Highway 98 and State Road 386 in Mexico Beach, proceed north on State Road 386 for 14.9 km (9.3 mi) to a paved road leading west, then west on this road (becomes a dirt road) for 8.0 km (5.0 mi) to the driveway into the Brownes Plantation. The bench marks are in the vicinity of the plantation. Tide gage and staff were located on a free standing structure in the bay. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8973 A 1976 DESIGNATION: 872 8973 A TIDAL MONUMENTATION: Tidal Station disk VM#: 9929 AGENCY: National Ocean Survey (NOS) IDB PID#: BE3817 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 2.4' N ( 30.04000) LONGITUDE: 85° 23.6' W ( -85.39330) The primary bench mark is a disk located 40 m (132 ft) SSE of bench mark 8973 C 1976, 27.89 m (91.5 ft) SW of the south corner of the Brownes residence, 8.69 m (28.5 ft) SE of the dock, and 1.77 m (5.8 ft) west of a pine tree with a witness sign. 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 PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8728973 PUBLICATION DATE: 02/05/2004 Name: WETAPPO CREEK, EAST BAY FL NOAA Chart: 11389 Latitude: 30° 2.3' N ( 30.03830) USGS Quad: ALLANTON Longitude: 85° 23.6' W ( -85.39330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8973 B 1976 DESIGNATION: 872 8973 B TIDAL MONUMENTATION: Tidal Station disk VM#: 9930 AGENCY: National Ocean Survey (NOS) IDB PID#: BE3814 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 2.4' N ( 30.04000) LONGITUDE: 85° 23.5' W ( -85.39170) The bench mark is a disk located on the north side of the drive at the entrance to the Brownes Plantation, 140 m (460 ft) east of bench mark 8973 D 1976, 28 m (92 ft) west of centerline of the dirt road, 26 m (86 ft) NW of a powerline pole, 2 m (6 ft) north of the centerline of the driveway, and 0.3 m (1 ft) east of the north gate post for the driveway. 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 PVC pipe and concrete kickblock. BENCH MARK STAMPING: 8973 C 1976 DESIGNATION: 872 8973 C TIDAL MONUMENTATION: Tidal Station disk VM#: 9931 AGENCY: National Ocean Survey (NOS) IDB PID#: BE3816 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 2.4' N ( 30.04000) LONGITUDE: 85° 23.6' W ( -85.39330) The bench mark is a disk located 40 m (132 ft) NNW of bench mark 8973 A 1976, 28 m (92 ft) west of the SW corner of a metallic shed, 25 m (82 ft) NW of the west corner of Brownes residence, and 2.3 m (7.4 ft) west of a group of pine trees with a witness sign. The bench mark is set level with the ground, crimped to the top of a copper-clad steel rod driven 12.2 m (40 ft) to refusal and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8728973 PUBLICATION DATE: 02/05/2004 Name: WETAPPO CREEK, EAST BAY FL NOAA Chart: 11389 Latitude: 30° 2.3' N ( 30.03830) USGS Quad: ALLANTON Longitude: 85° 23.6' W ( -85.39330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8973 D 1976 DESIGNATION: 872 8973 D TIDAL MONUMENTATION: Tidal Station disk VM#: 9932 AGENCY: National Ocean Survey (NOS) IDB PID#: BE3815 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 2.4' N ( 30.04000) LONGITUDE: 85° 23.6' W ( -85.39330) The bench mark is a disk located 140 m (460 ft) west of the entrance gate to the driveway, 41 m (134 ft) ESE of the SE corner of a metallic shed, 12.34 m (40.5 ft) north of the centerline of the driveway leading to Brownes residence, 11 m (37 ft) NE of a twin trunked pecan tree, and 2.0 m (6.5 ft) west of a power pole. 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 PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8728973 PUBLICATION DATE: 02/05/2004 Name: WETAPPO CREEK, EAST BAY FL NOAA Chart: 11389 Latitude: 30° 2.3' N ( 30.03830) USGS Quad: ALLANTON Longitude: 85° 23.6' W ( -85.39330) T I D A L D A T U M S Tidal datums at WETAPPO CREEK, EAST BAY based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: May 1976 - May 1976 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8729015 ALLANTON, EAST BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.504 MEAN HIGH WATER MHW = 0.450 MEAN SEA LEVEL MSL = 0.256 MEAN TIDE LEVEL MTL = 0.227 North American Vertical Datum NAVD88 = 0.199 MEAN LOW WATER MLW = 0.004 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8973 A 1976 1.064 0.614 8973 B 1976 2.136 1.686 8973 C 1976 1.056 0.606 8973 D 1976 1.464 1.014
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8728973 PUBLICATION DATE: 02/05/2004 Name: WETAPPO CREEK, EAST BAY FL NOAA Chart: 11389 Latitude: 30° 2.3' N ( 30.03830) USGS Quad: ALLANTON Longitude: 85° 23.6' W ( -85.39330) 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.