U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8765251 PUBLICATION DATE: 12/01/2011 Name: CYPREMORT POINT LA NOAA Chart: 11354 Latitude: 29° 42.8' N ( 29.71336) USGS Quad: POINT AU FER Longitude: 91° 52.8' W ( -91.88000) To reach Cypremort Point from the intersection of US-90 and LA-83 in New Iberia Parish, go SW for 23.8 km (14.8 mi) on LA-83, bearing left at the fork in the road. Turn right and continue SW on LA-319 for 12.8 km (8.0 mi). Turn left on Bayview lane and follow to Beacon lane, continue straight onto Beacon Lane following west 0.2 km (0.1 mi) to the end of the road. The station was set on the covered pier at the end of Beacon lane. The bench marks are located on Beacon lane and Bayview lane. 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 6 Station ID: 8765251 PUBLICATION DATE: 12/01/2011 Name: CYPREMORT POINT LA NOAA Chart: 11354 Latitude: 29° 42.8' N ( 29.71336) USGS Quad: POINT AU FER Longitude: 91° 52.8' W ( -91.88000) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: CYPR RESET TV14 SM 06 2001 DESIGNATION: TV14 SM 06 MONUMENTATION: Survey disk VM#: 17925 AGENCY: National Geodetic Survey (NGS) IDB PID#: DJ9345 SETTING CLASSIFICATION: Unspecified pipe/rod OPUS PID: LATITUDE: 29° 42.8' N ( 29.71378) LONGITUDE: 91° 52.7' W ( -91.87858) The primary bench mark is a disk located in the yard of 218 Beacon Lane, 10.95 m (35.93 ft) SE of the SE corner of the boathouse of 218 Beacon Lane, 4.45 m (14.60 ft) NW of Beacon Lane and 1.35 m (4.43 ft) SW of a power pole. The bench mark is set flush in the grass, crimped to a rod driven an unspecifed depth into the ground, encased in a 5-inch PVC pipe and capped with a NGS cover. BENCH MARK STAMPING: 5251 A 2005 DESIGNATION: 876 5251 A MONUMENTATION: Flange-encased Rod VM#: 17926 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBBJ01 LATITUDE: 29° 42.8' N ( 29.71333) LONGITUDE: 91° 52.8' W ( -91.87967) The bench mark is a flange-encased rod located at the end of Beacon Lane, 9.50 m (31.17 ft) SW of the southern corner of a boathouse, 7.15 m (23.46 ft) NW of a sewer man-hole cover, and 0.91 m (2.99 ft) east of a seawall. The datum point is set flush in the ground, being the top of a stainless steel rod driven 15.7 m (51.5 ft) to refusal, in a sleeve extending to a depth of 0.46 m (1.51ft), encased in a 5-inch PVC pipe, with a 5-inch NOS logo cap and surrounded by a cement kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8765251 PUBLICATION DATE: 12/01/2011 Name: CYPREMORT POINT LA NOAA Chart: 11354 Latitude: 29° 42.8' N ( 29.71336) USGS Quad: POINT AU FER Longitude: 91° 52.8' W ( -91.88000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5251 B 2005 DESIGNATION: 876 5251 B MONUMENTATION: Flange-encased Rod VM#: 17927 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 29° 42.9' N ( 29.71419) LONGITUDE: 91° 52.7' W ( -91.87786) The bench mark is a flange-encased rod located off of Beacon Lane, 25.95 m (85.14 ft) NW of a stop sign at the corner of Beacon Lane and LA-319, 7.20 m (23.62 ft) NW of Beacon Lane, and 0.75 m (2.46 ft) SE of a power pole. The datum point is set flush with the grass, being the top of a stainless steel rod driven 19.40 m (63.65 ft) to refusal, in a sleeve extending to a depth of 0.46 m (1.51ft), encased in a 5-inch PVC pipe with a 5-inch NOS logo cap and surrounded by a cement kickblock. BENCH MARK STAMPING: 5251 C 2005 DESIGNATION: 876 5251 C MONUMENTATION: Tidal Station disk VM#: 17929 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Seawall OPUS PID: LATITUDE: 29° 42.9' N ( 29.71428) LONGITUDE: 91° 52.6' W ( -91.87689) The bench mark is a disk set flush in a seawall at the entrance to Bayview Point, 20.09 m (65.91 ft) SW of power pole "50 K 82749 38134," 7.10 m (23.29 ft) from Bayview Drive, 2.50 m (8.2 ft) NW of Point Lane street sign, and 1.2 m (3.9 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8765251 PUBLICATION DATE: 12/01/2011 Name: CYPREMORT POINT LA NOAA Chart: 11354 Latitude: 29° 42.8' N ( 29.71336) USGS Quad: POINT AU FER Longitude: 91° 52.8' W ( -91.88000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5251 D 2005 DESIGNATION: 876 5251 D MONUMENTATION: Tidal Station disk VM#: 17930 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Seawall OPUS PID: LATITUDE: 29° 42.8' N ( 29.71339) LONGITUDE: 91° 52.6' W ( -91.87678) The bench mark is a disk set flush in the seawall adjacent to Bayview Point condominium, 30.51 m (100.10 ft) SW of SW corner of condo unit #111, 5.61 m (18.41 ft) west of Point Lane, and 3.69 m (12.11ft) SW of power box "82746 38102."
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8765251 PUBLICATION DATE: 12/01/2011 Name: CYPREMORT POINT LA NOAA Chart: 11354 Latitude: 29° 42.8' N ( 29.71336) USGS Quad: POINT AU FER Longitude: 91° 52.8' W ( -91.88000) T I D A L D A T U M S Tidal datums at CYPREMORT POINT based on: LENGTH OF SERIES: 49 MONTHS TIME PERIOD: August 2006 - August 2010 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8764227 LAWMA, AMERADA PASS Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (04/30/2006) = 1.288 MEAN HIGHER HIGH WATER MHHW = 0.518 MEAN HIGH WATER MHW = 0.476 MEAN TIDE LEVEL MTL = 0.274 MEAN SEA LEVEL MSL = 0.274 MEAN LOW WATER MLW = 0.072 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (12/16/2007) = -0.886 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW CYPR RESET TV14 SM 06 2001 1.149 0.673 5251 A 2005 1.301 0.825 5251 B 2005 1.374 0.898 5251 C 2005 1.798 1.322 5251 D 2005 1.741 1.265
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8765251 PUBLICATION DATE: 12/01/2011 Name: CYPREMORT POINT LA NOAA Chart: 11354 Latitude: 29° 42.8' N ( 29.71336) USGS Quad: POINT AU FER Longitude: 91° 52.8' W ( -91.88000) 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.