U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8729909 PUBLICATION DATE: 06/16/2004 Name: BIG LAGOON FL NOAA Chart: 11382 Latitude: 30° 19.6' N ( 30.32670) USGS Quad: FORT BARRANCAS Longitude: 87° 21.4' W ( -87.35670) To reach the tidal bench marks from the intersection of State Road 292 and County Road 292-A (Gulf Beach Highway) in the community of Perdido Bay, proceed east on County Road 292-A for 5.23 km (3.25 mi) to the Grand Lagoon Yacht Club on the south side of the highway. The bench marks are along County Road 292-A and at the yacht club. The tide gage and staff were located on the Grand Lagoon Yacht Club pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9909 C 1977 DESIGNATION: 872 9909 C TIDAL MONUMENTATION: Tidal Station disk VM#: 10308 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3624 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: BG3624 LATITUDE: 30° 19.6' N ( 30.32670) LONGITUDE: 87° 22.1' W ( -87.36830) The primary bench mark is a disk located 13.20 m (43.3 ft) west of the centerline of the entrance drive to the Grand Lagoon Yacht Club, 10.27 m (33.7 ft) south of the centerline of County Road 292-A (Gulf Beach Highway), 2.13 m (7.0 ft) east of the yacht club sign, 1.34 m (4.4 ft) north of a 1 m (2 ft) square piece of concrete, and 0.30 m (1 ft) north of a witness post. The bench mark is set 0.09 m (0.3 ft) below ground level, crimped to the top of a copper-clad steel rod driven an unspecified depth 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: 8729909 PUBLICATION DATE: 06/16/2004 Name: BIG LAGOON FL NOAA Chart: 11382 Latitude: 30° 19.6' N ( 30.32670) USGS Quad: FORT BARRANCAS Longitude: 87° 21.4' W ( -87.35670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9909 D 1977 DESIGNATION: 872 9909 D TIDAL MONUMENTATION: Tidal Station disk VM#: 10309 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3623 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 19.7' N ( 30.32830) LONGITUDE: 87° 22.1' W ( -87.36830) The bench mark is a disk located 103 m (337 ft) west of bench mark 9909 E 1977, 32 m (105 ft) west of a private driveway, 9.14 m (30.0 ft) east of the east entrance to the parking lot for a Catholic Church, 8.75 m (28.7 ft) north of the centerline of State Road 292-A (Gulf Beach Highway), 2.07 m (6.8 ft) SW of powerline pole #0952349408, and 9 cm (0.3 ft) south of a 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 an unspecified depth to refusal, and encased in a PVC pipe and concrete kickblock. BENCH MARK STAMPING: 9909 E 1977 DESIGNATION: 872 9909 E TIDAL MONUMENTATION: Tidal Station disk VM#: 10310 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3622 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 19.7' N ( 30.32830) LONGITUDE: 87° 22.0' W ( -87.36670) The bench mark is a disk located 9.81 m (32.2 ft) east of the centerline of a dirt driveway, 9.60 m (31.5 ft) north of the centerline of State Road 292-A (Gulf Beach Highway), and 2.68 m (8.8 ft) SSE of school bus shelter across street from residence #10611. The bench mark is set 9 cm (0.3 ft) below ground level, crimped to the top of a copper-clad steel rod driven an unspecified depth 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: 8729909 PUBLICATION DATE: 06/16/2004 Name: BIG LAGOON FL NOAA Chart: 11382 Latitude: 30° 19.6' N ( 30.32670) USGS Quad: FORT BARRANCAS Longitude: 87° 21.4' W ( -87.35670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9909 F 1984 DESIGNATION: 872 9909 F TIDAL MONUMENTATION: Tidal Station disk VM#: 10311 AGENCY: National Ocean Service (NOS) IDB PID#: BG3625 SETTING CLASSIFICATION: Concrete steps OPUS PID: LATITUDE: 30° 19.6' N ( 30.32670) LONGITUDE: 87° 22.1' W ( -87.36830) The bench mark is a disk set in top of the first concrete step for the stairway on the east side of the clubhouse, 15.45 m (50.7 ft) north of the SW corner of the clubhouse, 7.44 m (24.4 ft) south of the NW corner of the clubhouse, and 4.42 m (14.5 ft) east of the centerline of the drive to the boat basin. BENCH MARK STAMPING: 9909 A 1977 DESIGNATION: 872 9909 A TIDAL MONUMENTATION: Tidal Station disk VM#: 16554 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3626 SETTING CLASSIFICATION: Concrete base for flagpole OPUS PID: LATITUDE: 30° 19.6' N ( 30.32670) LONGITUDE: 87° 22.1' W ( -87.36830) The bench mark is a disk set in the top of the concrete base for the flagpole at the Grand Lagoon Yacht Club, 53 m (175 ft) SSW of the SW corner of the clubhouse, 6 m (21 ft) east of a boat ramp, and 0.4 m (1.4 ft) north of the flagpole.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8729909 PUBLICATION DATE: 06/16/2004 Name: BIG LAGOON FL NOAA Chart: 11382 Latitude: 30° 19.6' N ( 30.32670) USGS Quad: FORT BARRANCAS Longitude: 87° 21.4' W ( -87.35670) T I D A L D A T U M S Tidal datums at BIG LAGOON based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: January 1994 - February 1994 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 = 0.322 MEAN HIGH WATER MHW = 0.313 MEAN TIDE LEVEL MTL = 0.163 MEAN SEA LEVEL MSL = 0.153 North American Vertical Datum NAVD88 = 0.052 MEAN LOW WATER MLW = 0.013 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9909 C 1977 4.147 3.834 9909 D 1977 4.389 4.076 9909 E 1977 4.007 3.694 9909 F 1984 2.374 2.061 9909 A 1977 1.072 0.759
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8729909 PUBLICATION DATE: 06/16/2004 Name: BIG LAGOON FL NOAA Chart: 11382 Latitude: 30° 19.6' N ( 30.32670) USGS Quad: FORT BARRANCAS Longitude: 87° 21.4' W ( -87.35670) 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.