U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8729102 PUBLICATION DATE: 06/28/2004 Name: LYNN HAVEN, NORTH BAY FL NOAA Chart: 11390 Latitude: 30° 15.3' N ( 30.25500) USGS Quad: SOUTHPORT Longitude: 85° 38.9' W ( -85.64830) To reach the tidal bench marks from city hall in Lynn Haven, proceed north on State Route 77 for 0.6 km (0.4 mi) to Ohio Avenue, then continue north on Ohio Avenue for 0.3 km (0.2 mi) to the south edge of North Bay. The bench marks are located in area between North Bay Bridge and a privatly owned pier just west of the bridge. The tide gage and staff were located on the NE corner of the privatly owned pier. T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8729102 PUBLICATION DATE: 06/28/2004 Name: LYNN HAVEN, NORTH BAY FL NOAA Chart: 11390 Latitude: 30° 15.3' N ( 30.25500) USGS Quad: SOUTHPORT Longitude: 85° 38.9' W ( -85.64830) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: LYNN HAVEN NO 1 1935 DESIGNATION: LYNN HAVEN 1 MONUMENTATION: Tidal Station disk VM#: 9991 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BE0656 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 15.3' N ( 30.25500) LONGITUDE: 8° 39.0' W ( -8.65000) The primary bench mark is a disk set in the top of concrete filled tile monument, 61.26 m (201.0 ft) east of bench mark LYNN HAVEN NO 2 1935, 57.61 m (189.0 ft) WSW of and across a small bayou from the SW corner of the State Highway 77 bridge over North Bay, 19.81 m (65.0 ft) south of the shoreline of North Bay, 19.20 m (63.0 ft) west of the west edge of the bayou, 13.72 m (45.0 ft) NE of the NE corner of a house, 7.16 m (23.5 ft) south of a 0.61 m (2.0 ft) diameter pine tree, 6.40 m (21.0 ft) east of a 0.61 m (2.0 ft) diameter magnolia tree, and 9 cm (0.3 ft) above ground level. NOTE: Mark not found in 1994 by US Power Squadron.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8729102 PUBLICATION DATE: 06/28/2004 Name: LYNN HAVEN, NORTH BAY FL NOAA Chart: 11390 Latitude: 30° 15.3' N ( 30.25500) USGS Quad: SOUTHPORT Longitude: 85° 38.9' W ( -85.64830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: LYNN HAVEN NO 2 1935 DESIGNATION: LYNN HAVEN 2 MONUMENTATION: Tidal Station disk VM#: 9992 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BE0657 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 15.3' N ( 30.25500) LONGITUDE: 8° 39.0' W ( -8.65000) The bench mark is a disk set in the top of a concrete-filled tile monument, 65.23 m (214.0 ft) south of the shoreline of North Bay, 61 m (200 ft) SW of bench mark LYNN HAVEN NO 1 1935, 33.83 m (111.0 ft) SE of the SE corner of a large brick house, 20.42 m (67.0 ft) east of the extended centerline of Ohio Avenue, 8.53 m (28.0 ft) SW of a powerline pole with two transformers, and 9 cm (0.3 ft) above ground level. NOTE: Mark not found in 1994 by US Power Squadron.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8729102 PUBLICATION DATE: 06/28/2004 Name: LYNN HAVEN, NORTH BAY FL NOAA Chart: 11390 Latitude: 30° 15.3' N ( 30.25500) USGS Quad: SOUTHPORT Longitude: 85° 38.9' W ( -85.64830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: LYNN HAVEN NO 3 1935 DESIGNATION: LYNN HAVEN 3 MONUMENTATION: Tidal Station disk VM#: 9993 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BE0658 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 15.3' N ( 30.25500) LONGITUDE: 8° 39.0' W ( -8.65000) The bench mark is a disk set in the top of a concrete-filled tile monument, 61 m (200 ft) west of bench mark LYNN HAVEN NO 1 1935, 51.36 m (168.5 ft) NW of bench mark Lynn Haven No 2 1935, 39.62 m (130.0 ft) west of the NW corner of a wood frame house, 32 m (105 ft) NE of the NE corner of a large brick house, 29.87 m (98.0 ft) south of the shoreline of North Bay, 2.74 m (9.0 ft) SW of an inplace lawn sprinkler, and 6 cm (0.2 ft) above ground level. NOTE: Mark not found in 1994 by US Power Squadron.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8729102 PUBLICATION DATE: 06/28/2004 Name: LYNN HAVEN, NORTH BAY FL NOAA Chart: 11390 Latitude: 30° 15.3' N ( 30.25500) USGS Quad: SOUTHPORT Longitude: 85° 38.9' W ( -85.64830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: X 290 1967 DESIGNATION: X 290 MONUMENTATION: Bench Mark disk VM#: 9994 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BE0655 SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID: LATITUDE: 30° 15.3' N ( 30.25500) LONGITUDE: 8° 38.9' W ( -8.64833) The bench mark is a disk set in top of the west end of the south concrete abutment of the State Highway 77 bridge over North Bay, 5.64 m (18.5 ft) west of the centerline of the highway, and 0.3 m (1 ft) above the level of the highway, and 0.30 m (1 ft) above the level of the highway. NOTE: Mark not found in 1999 by US Power Squadron. BENCH MARK STAMPING: NO 8 1975 DESIGNATION: 872 9102 TIDAL 8 MONUMENTATION: Tidal Station disk VM#: 9995 AGENCY: National Ocean Survey (NOS) IDB PID#: BE1713 SETTING CLASSIFICATION: Concrete drainage basin OPUS PID#: BE1713 LATITUDE: 30° 15.2' N ( 30.25330) LONGITUDE: 8° 38.9' W ( -8.64833) The bench mark is a disk set flush in the corner of a concrete box drain along a drive leading from State Route 77 to Leslie Porter Park, 30.48 m (100.0 ft) east of the centerline of State Route 77, 19.45 m (63.8 ft) east of a wooden light pole, 5.79 m (19.0 ft) south of the centerline of the drive to Leslie Porter Park, and 2.50 m (8.2 ft) north of the edge of a cement culvert.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8729102 PUBLICATION DATE: 06/28/2004 Name: LYNN HAVEN, NORTH BAY FL NOAA Chart: 11390 Latitude: 30° 15.3' N ( 30.25500) USGS Quad: SOUTHPORT Longitude: 85° 38.9' W ( -85.64830) T I D A L D A T U M S Tidal datums at LYNN HAVEN, NORTH BAY based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: January 1976 - December 1976 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 (12/25/1975) = 1.002 MEAN HIGHER HIGH WATER MHHW = 0.448 MEAN HIGH WATER MHW = 0.412 MEAN TIDE LEVEL MTL = 0.222 MEAN SEA LEVEL MSL = 0.220 North American Vertical Datum NAVD88 = 0.173 MEAN LOW WATER MLW = 0.032 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/27/1987) = -0.854 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW LYNN HAVEN NO 1 1935 2.243 1.831 LYNN HAVEN NO 2 1935 2.866 2.454 LYNN HAVEN NO 3 1935 2.474 2.062 X 290 1967 2.754 2.342 NO 8 1975 1.874 1.462
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8729102 PUBLICATION DATE: 06/28/2004 Name: LYNN HAVEN, NORTH BAY FL NOAA Chart: 11390 Latitude: 30° 15.3' N ( 30.25500) USGS Quad: SOUTHPORT Longitude: 85° 38.9' W ( -85.64830) 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.