U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8729889 PUBLICATION DATE: 05/20/2004 Name: HEAD OF BAYOU GRANDE FL NOAA Chart: 11383 Latitude: 30° 22.2' N ( 30.37000) USGS Quad: FORT BARRANCAS Longitude: 87° 19.1' W ( -87.31830) To reach the tidal bench marks from the intersection of Navy Boulevard (State Road 295) and Gulf Beach Highway (State Road 292) in Warrington, proceed SW on Gulf Beach Highway for 4.5 km (2.8 mi) to Waycoss Avenue, then south on Waycross Avenue for 0.40 km (0.25 mi) to Bayou Grande. The bench marks are along Waycross Avenue. The tide gage and staff were located on the dock at the residence of Mr. John Early, at 4 Waycross Avenue. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9889 A 1977 DESIGNATION: 872 9889 A TIDAL MONUMENTATION: Tidal Station disk VM#: 10297 AGENCY: National Ocean Survey (NOS) IDB PID#: BG4544 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 22.3' N ( 30.37170) LONGITUDE: 87° 19.2' W ( -87.32000) The primary bench mark is a disk located SE of the intersection of Waycross Avenue and Sunnyside Street, 126 m (413 ft) SE of bench mark 9889 B 1977, 7.62 m (25.0 ft) NE of the centerline of Waycross Avenue, 4.02 m (13.2 ft) SE of the centerline of Sunnyside Street, and 0.73 m (2.4 ft) SW of a powerline pole. The bench mark is set 18 cm (0.6 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: 8729889 PUBLICATION DATE: 05/20/2004 Name: HEAD OF BAYOU GRANDE FL NOAA Chart: 11383 Latitude: 30° 22.2' N ( 30.37000) USGS Quad: FORT BARRANCAS Longitude: 87° 19.1' W ( -87.31830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9889 B 1977 DESIGNATION: 872 9889 B TIDAL MONUMENTATION: Tidal Station disk VM#: 10298 AGENCY: National Ocean Survey (NOS) IDB PID#: BG4543 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 22.3' N ( 30.37170) LONGITUDE: 87° 19.3' W ( -87.32170) The bench mark is a disk located near the east property corner of 115 Waycross Avenue, 126 m (413 ft) NW of bench mark 9889 A 1977, 19.69 m (64.6 ft) east of the east corner of house # 115, 10 m (34 ft) SW of the centerline of Waycross Avenue, and 1.25 m (4.1 ft) ESE of a powerline pole. The bench mark is set 15 cm (0.5 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: 9889 C 1977 DESIGNATION: 872 9889 C TIDAL MONUMENTATION: Tidal Station disk VM#: 10299 AGENCY: National Ocean Survey (NOS) IDB PID#: BG4540 SETTING CLASSIFICATION: Concrete monument OPUS PID#: BG4540 LATITUDE: 30° 22.5' N ( 30.37500) LONGITUDE: 87° 19.3' W ( -87.32170) The bench mark is a disk set in the top of a concrete monument, near the intersection of Waycross Avenue and Gulf Beach Highway, 15 m (50 ft) NW of the residence at 220 Waycross Avenue, 10.73 m (35.2 ft) SE of the centerline of the highway, 9 m (30.0 ft) ENE of the centerline of Waycross Avenue, 0.55 m (1.8 ft) NW of a witness post, 1.37 m (4.5 ft) NW of a 0.3 m (1 ft) diameter pine tree, and 6 cm (0.2 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8729889 PUBLICATION DATE: 05/20/2004 Name: HEAD OF BAYOU GRANDE FL NOAA Chart: 11383 Latitude: 30° 22.2' N ( 30.37000) USGS Quad: FORT BARRANCAS Longitude: 87° 19.1' W ( -87.31830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9889 D 1977 DESIGNATION: 872 9889 D TIDAL MONUMENTATION: Tidal Station disk VM#: 10300 AGENCY: National Ocean Survey (NOS) IDB PID#: BG4542 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 30° 22.4' N ( 30.37330) LONGITUDE: 87° 19.3' W ( -87.32170) The bench mark is a disk, located near the intersection of Waycross Avenue and Stonewall Street, 215 m (707 ft) NW of bench mark 9889 A 1977, 18.11 m (59.4 ft) NW of a powerline pole, 9.48 m (31.1 ft) NE of the centerline of Waycross Avenue, 8.96 m (29.4 ft) NW of the centerline of Stonewall Street, and 0.3 m (1 ft) SE of a bamboo fence. The bench mark is set 6 cm (0.2 ft) below ground level, crimped to the top of a galvanized steel rod driven 12.2 m (40 ft) to refusal, and encased in a PVC pipe and concrete kickblock. BENCH MARK STAMPING: 9889 E 1977 DESIGNATION: 872 9889 E TIDAL MONUMENTATION: Tidal Station disk VM#: 10301 AGENCY: National Ocean Survey (NOS) IDB PID#: BG4541 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 30° 22.5' N ( 30.37500) LONGITUDE: 87° 19.3' W ( -87.32170) The bench mark is a disk located 90 m (295 ft) south of bench mark 9889 C 1977, 20 m (67 ft) NW of powerline pole # 1103951063, 5.94 m (19.5 ft) NE of the centerline of Waycross Avenue, 0.98 m (3.2 ft) SE of a fence corner, and directly under a chainlink fence. The bench mark is set 12 cm (0.4 ft) below ground level, crimped to the top of a galvanized 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: 8729889 PUBLICATION DATE: 05/20/2004 Name: HEAD OF BAYOU GRANDE FL NOAA Chart: 11383 Latitude: 30° 22.2' N ( 30.37000) USGS Quad: FORT BARRANCAS Longitude: 87° 19.1' W ( -87.31830) T I D A L D A T U M S Tidal datums at HEAD OF BAYOU GRANDE based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: March 1977 - May 1977 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 = 0.376 MEAN HIGH WATER MHW = 0.366 MEAN TIDE LEVEL MTL = 0.187 MEAN SEA LEVEL MSL = 0.185 North American Vertical Datum NAVD88 = 0.089 MEAN LOW WATER MLW = 0.007 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9889 A 1977 2.049 1.683 9889 B 1977 4.667 4.301 9889 C 1977 5.661 5.295 9889 D 1977 5.670 5.304 9889 E 1977 5.544 5.178
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8729889 PUBLICATION DATE: 05/20/2004 Name: HEAD OF BAYOU GRANDE FL NOAA Chart: 11383 Latitude: 30° 22.2' N ( 30.37000) USGS Quad: FORT BARRANCAS Longitude: 87° 19.1' W ( -87.31830) 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.