U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8729962 PUBLICATION DATE: 09/16/2003 Name: PERDIDO BAY FL NOAA Chart: 11382 Latitude: 30° 23.6' N ( 30.39330) USGS Quad: LILLIAN Longitude: 87° 25.5' W ( -87.42500) To reach the tidal bench marks from the intersection of U.S. Highway 98 and State Route 295 (Navy Boulevard), proceed west on U.S. Highway 98 for 14.0 km (8.7 mi) to Perdido Manor Road, then turn left and proceed south on Perdido Manor Drive for 0.6 km (0.4 mi) to the J.E. Mattis residence. The bench marks are at the Mattis residence and along U.S. Highway 98. The tide gage and staff were located on the dock at the Mattis residence. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 1 1973 DESIGNATION: 872 9962 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 10327 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3410 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 30° 23.7' N ( 30.39500) LONGITUDE: 87° 25.4' W ( -87.42330) The primary bench mark is a disk set in the top of a concrete sea wall, 101 m (330 ft) west of the NW corner of the Mattis house, 4.27 m (14.0 ft) east of the east end of a wood pier, 1.71 m (5.6 ft) west of a post with flood lights, and 0.61 m (2.0 ft) south of a witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8729962 PUBLICATION DATE: 09/16/2003 Name: PERDIDO BAY FL NOAA Chart: 11382 Latitude: 30° 23.6' N ( 30.39330) USGS Quad: LILLIAN Longitude: 87° 25.5' W ( -87.42500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2 1973 DESIGNATION: 872 9962 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 10328 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3409 SETTING CLASSIFICATION: Concrete walkway OPUS PID: LATITUDE: 30° 23.8' N ( 30.39670) LONGITUDE: 87° 25.4' W ( -87.42330) The bench mark is a disk set in top of the concrete walkway in front of the Mattis house, 41 m (135 ft) SW of the centerline of Perdido Manor Road, 1.98 m (6.5 ft) NE of the north side of the garage, 0.76 m (2.5 ft) east of east walkway at the Mattis house, and 0.12 m (0.4 ft) south of the porch.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8729962 PUBLICATION DATE: 09/16/2003 Name: PERDIDO BAY FL NOAA Chart: 11382 Latitude: 30° 23.6' N ( 30.39330) USGS Quad: LILLIAN Longitude: 87° 25.5' W ( -87.42500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: K 5 1940 DESIGNATION: K 5 USGS MONUMENTATION: Bench Mark disk VM#: 10331 AGENCY: US Geological Survey (USGS) IDB PID#: BG3406 SETTING CLASSIFICATION: Concrete culvert head wall OPUS PID: LATITUDE: 30° 23.9' N ( 30.39830) LONGITUDE: 87° 25.0' W ( -87.41670) The bench mark is a disk set in top of a concrete culvert head wall, 36.58 m (120.0 ft) SW of the SW corner of house # 318 (U.S. Highway 98), 26.82 m (88.0 ft) NW of telephone pole # LH 187, 6.19 m (20.3 ft) NW of a fence corner, 5.49 m (18.0 ft) south of the centerline of U.S. Highway 98, and 1.37 m (4.5 ft) west of a witness post. BENCH MARK STAMPING: 9962 D 1993 DESIGNATION: 872 9962 D MONUMENTATION: Tidal Station disk VM#: 16555 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete driveway OPUS PID: LATITUDE: 30° 23.7' N ( 30.39500) LONGITUDE: 87° 25.5' W ( -87.42500) The bench mark is a disk set flush in the concrete driveway at 1130 Spanish Moss Drive, 30.72 m (100.8 ft) east of the centerline of Perdido Manor Drive, 14.66 m (48.1 ft) south of the SW corner of the house, and 6.37 m (20.9 ft) north of the centerline of Spanish Moss Drive.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8729962 PUBLICATION DATE: 09/16/2003 Name: PERDIDO BAY FL NOAA Chart: 11382 Latitude: 30° 23.6' N ( 30.39330) USGS Quad: LILLIAN Longitude: 87° 25.5' W ( -87.42500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9962 E 1993 DESIGNATION: 872 9962 E MONUMENTATION: Tidal Station disk VM#: 16556 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete driveway OPUS PID: LATITUDE: 30° 23.7' N ( 30.39500) LONGITUDE: 87° 25.5' W ( -87.42500) The bench mark is a disk set flush in the concrete driveway at 1070 Spanish Moss Drive, 10.21 m (33.5 ft) south of the centerline of Spanish Moss Drive, 6.34 m (20.8 ft) east of the city water meter cover, 17.10 m (56.1 ft) north of the NE corner of the house at the residence of J. R. Van Landingham. BENCH MARK STAMPING: 9962 G 1984 DESIGNATION: 872 9962 G TIDAL MONUMENTATION: Tidal Station disk VM#: 16558 AGENCY: National Ocean Service (NOS) IDB PID#: BG3647 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 24.0' N ( 30.40000) LONGITUDE: 87° 25.4' W ( -87.42330) The bench mark is a disk located 0.3 km (0.2 mi) SE of bench mark 9962 F, 10.39 m (34.1 ft) SW of the centerline of U.S. Highway 98, 8.90 m (29.2 ft) SE of the centerline of Perdido Manor Road, 3.05 m (10.0 ft) east of a 0.3 m (1 ft) diameter pine tree, 0.67 m (2.2 ft) SW of a metal right-of-way marker, and 0.37 m (1.2 ft) NE of a witness post. The bench mark is crimped to the top of a stainless steel rod driven 15.5 m (51.0 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 5 of 6 Station ID: 8729962 PUBLICATION DATE: 09/16/2003 Name: PERDIDO BAY FL NOAA Chart: 11382 Latitude: 30° 23.6' N ( 30.39330) USGS Quad: LILLIAN Longitude: 87° 25.5' W ( -87.42500) T I D A L D A T U M S Tidal datums at PERDIDO BAY based on: LENGTH OF SERIES: 5 Years TIME PERIOD: June 1973 - May 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8729840 PENSACOLA, PENSACOLA BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (02/11/1994) = 0.397 MEAN HIGHER HIGH WATER MHHW = 0.218 MEAN HIGH WATER MHW = 0.214 MEAN TIDE LEVEL MTL = 0.108 MEAN SEA LEVEL MSL = 0.105 MEAN LOW WATER MLW = 0.003 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum NAVD88 = -0.012 LOWEST OBSERVED WATER LEVEL (02/01/1994) = -0.274 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 1 1973 0.563 0.349 2 1973 3.365 3.151 K 5 1940 6.519 6.305 9962 D 1993 3.278 3.064 9962 E 1993 3.306 3.091 9962 G 1984 1.906 1.692
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8729962 PUBLICATION DATE: 09/16/2003 Name: PERDIDO BAY FL NOAA Chart: 11382 Latitude: 30° 23.6' N ( 30.39330) USGS Quad: LILLIAN Longitude: 87° 25.5' W ( -87.42500) 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.