U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8729849 PUBLICATION DATE: 05/20/2004 Name: BAYOU CHICO FL NOAA Chart: 11383 Latitude: 30° 24.1' N ( 30.40170) USGS Quad: WEST PENSACOLA Longitude: 87° 15.1' W ( -87.25170) To reach the tidal bench marks from the intersection of Pace Boulevard (State Route 292) and West Garden Street (U.S. Highway 98 Business) in Pensacola, proceed south for 2.1 km (1.3 mi) on Pace Boulevard to the junction of Wels Lane, then turn right and proceed west on Wels Road for 0.6 km (0.4 mi) to Audusson Avenue, then turn right and proceed NE on Audusson Avenue for 0.2 km (0.1 mi) to Recho Bell Marine Service on Bayou Chico. The bench marks are on the Recho Bell Marine Service property and near the WCOA Radio Station. The tide gage and staff were located on the easternmost dock at Recho Bell Marine Service. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9849 A 1977 DESIGNATION: 872 9849 A TIDAL MONUMENTATION: Tidal Station disk VM#: 10273 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3653 SETTING CLASSIFICATION: Concrete retaining wall OPUS PID: LATITUDE: 30° 24.1' N ( 30.40170) LONGITUDE: 87° 15.1' W ( -87.25170) The primary bench mark is a disk set in top of the concrete retaining wall along the NE property line of the Recho Bell Marine Service, 21 m (70 ft) NE of the north corner of Mr. Recho Bell's residence, 17.83 m (58.5 ft) SE of the NW end of the wall at the water's edge, and 1 m (2 ft) NW of the SE end of the wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8729849 PUBLICATION DATE: 05/20/2004 Name: BAYOU CHICO FL NOAA Chart: 11383 Latitude: 30° 24.1' N ( 30.40170) USGS Quad: WEST PENSACOLA Longitude: 87° 15.1' W ( -87.25170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9849 B 1977 DESIGNATION: 872 9849 B TIDAL MONUMENTATION: Tidal Station disk VM#: 10274 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3652 SETTING CLASSIFICATION: Copper clad steel rod OPUS PID: LATITUDE: 30° 24.0' N ( 30.40000) LONGITUDE: 87° 15.2' W ( -87.25330) The bench mark is a disk located near the junction of Audusson Avenue and Lakewood Road, 14 m (47 ft) WSW of the west corner of the house at #3 Audusson Avenue, 9 m (31 ft) SE of the centerline of Audusson Avenue, 8 m (27 ft) NE of the centerline of Lakewood Road, and 1.0 m (3.4 ft) SE of powerline pole with a witness sign. The bench mark is set 12 cm (0.4 ft) below ground level, crimped to the top of a copper-clad steel rod driven 12.2 m (40 ft), and encased in a PVC pipe and concrete kickblock. BENCH MARK STAMPING: 9849 C 1977 DESIGNATION: 872 9849 C TIDAL MONUMENTATION: Tidal Station disk VM#: 10275 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3649 SETTING CLASSIFICATION: Copper clad steel rod OPUS PID: LATITUDE: 30° 24.0' N ( 30.40000) LONGITUDE: 87° 15.2' W ( -87.25330) The bench mark is a disk located SE of the dirt drive leading SW from Lakewood Road to the WCOA broadcast towers, 34 m (110 ft) east of the east corner of the WCOA Radio Station broadcast building, 13 m (43 ft) SW of the centerline of Lakewood Road, 1.07 m (3.5 ft) west of a powerline pole, and 0.3 m (1 ft) NW of a witness post. The bench mark is set 0.1 m (0.3 ft) below ground level, crimped to the top of a copper-clad steel rod driven 12.2 m (40 ft), 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: 8729849 PUBLICATION DATE: 05/20/2004 Name: BAYOU CHICO FL NOAA Chart: 11383 Latitude: 30° 24.1' N ( 30.40170) USGS Quad: WEST PENSACOLA Longitude: 87° 15.1' W ( -87.25170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9849 D 1977 DESIGNATION: 872 9849 D TIDAL MONUMENTATION: Tidal Station disk VM#: 10276 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3651 SETTING CLASSIFICATION: Concrete footing OPUS PID: LATITUDE: 30° 24.0' N ( 30.40000) LONGITUDE: 87° 15.2' W ( -87.25330) The bench mark is a disk set in top of the concrete footing of a storage building behind the WCOA Radio Station, 50.44 m (165.5 ft) SW of the centerline of Lakewood Road, 8.32 m (27.3 ft) SW of the west corner of the WCOA Broadcast Building, 0.55 m (1.8 ft) east of the NW corner of the storage building, and is beneath the roof eave of the storage building. NOTE: Mark not found in 1997 by US Power Squadron. BENCH MARK STAMPING: 9849 E 1977 DESIGNATION: 872 9849 E TIDAL MONUMENTATION: Tidal Station disk VM#: 10277 AGENCY: National Ocean Survey (NOS) IDB PID#: BG3650 SETTING CLASSIFICATION: Radio tower foundation OPUS PID: LATITUDE: 30° 23.9' N ( 30.39830) LONGITUDE: 87° 15.2' W ( -87.25330) The bench mark is a disk set in top of the SW corner of the foundation for a radio tower (tower now is gone), 110 m (361 ft) south of the south corner of the WCOA broadcast building, and 0.3 m (1 ft) SW of a witness post. NOTE: Mark not found in 1997 by US Power Squadron.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8729849 PUBLICATION DATE: 05/20/2004 Name: BAYOU CHICO FL NOAA Chart: 11383 Latitude: 30° 24.1' N ( 30.40170) USGS Quad: WEST PENSACOLA Longitude: 87° 15.1' W ( -87.25170) T I D A L D A T U M S Tidal datums at BAYOU CHICO 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 = 0.190 MEAN SEA LEVEL MSL = 0.182 North American Vertical Datum NAVD88 = 0.080 MEAN LOW WATER MLW = 0.014 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9849 A 1977 3.679 3.313 9849 B 1977 5.898 5.532 9849 C 1977 6.685 6.319 9849 D 1977 6.905 6.539 9849 E 1977 7.597 7.231
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8729849 PUBLICATION DATE: 05/20/2004 Name: BAYOU CHICO FL NOAA Chart: 11383 Latitude: 30° 24.1' N ( 30.40170) USGS Quad: WEST PENSACOLA Longitude: 87° 15.1' W ( -87.25170) 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.