U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8747398 PUBLICATION DATE: 02/26/2004 Name: NORTH SHORE, BAY OF ST. LOUIS MS NOAA Chart: 11371 Latitude: 30° 22.4' N ( 30.37330) USGS Quad: BAY ST. LOUIS Longitude: 89° 19.3' W ( -89.32170) To reach the tidal bench marks from Exit 20 of Interstate Highway 10, proceed SE on Kiln-Delisle Road for 0.5 km (0.3 mi) to an old paved road and two large white entrance pillars on the right-hand side of the road, then turn right and continue on the broken pavement road for 1.8 km (1.1 mi) to a circle around some trees, then go 180 degrees around the circle and continue SW for another 0.8 km (0.5 mi) to the abandoned Oblate Fathers Monastery. The bench marks are located in the vicinity of the monastery. The tide gage and staff were located at the SE corner of the abandoned pier pilings, SW of the monastery. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7398 A 1978 DESIGNATION: 874 7398 A TIDAL MONUMENTATION: Tidal Station disk VM#: 10438 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 22.4' N ( 30.37330) LONGITUDE: 89° 19.3' W ( -89.32170) The primary bench mark is a disk located near the foot of the abandoned pier, 14.84 m (48.7 ft) NE of the northeasternmost pile from the pier, and 14 m (47 ft) north of the shoreline in a stand of pine trees. The bench mark is set 12 cm (0.4 ft) below the ground, crimped to the top of a stainless steel rod driven 21.9 m (72 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8747398 PUBLICATION DATE: 02/26/2004 Name: NORTH SHORE, BAY OF ST. LOUIS MS NOAA Chart: 11371 Latitude: 30° 22.4' N ( 30.37330) USGS Quad: BAY ST. LOUIS Longitude: 89° 19.3' W ( -89.32170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7398 B 1978 DESIGNATION: 874 7398 B TIDAL MONUMENTATION: Tidal Station disk VM#: 10439 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 22.4' N ( 30.37330) LONGITUDE: 89° 19.3' W ( -89.32170) The bench mark is a disk located 85 m (278 ft) SW of the SW corner of the monastery, 77 m (251 ft) north of the high water shoreline, 62 m (204 ft) NNW of bench mark 7398 A 1978, and 23.26 m (76.3 ft) west of an 0.46 m (1.5 ft) diameter oak tree. The bench mark is set 0.18 m (0.6 ft) below the ground, crimped to the top of a stainless steel rod driven 21.9 m (72 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 7398 C 1978 DESIGNATION: 874 7398 C TIDAL MONUMENTATION: Tidal Station disk VM#: 10440 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Sidewalk OPUS PID: LATITUDE: 30° 22.4' N ( 30.37330) LONGITUDE: 89° 19.3' W ( -89.32170) The bench mark is a disk set flush in a sidewalk near the NW corner of the monastery, 73 m (239 ft) NE of bench mark 7398 B 1978, 34 m (112 ft) WNW of the SW corner of the monastery, 31 m (101 ft) west of the NW corner, and 0.61 m (2.0 ft) SE of the west edge of the sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8747398 PUBLICATION DATE: 02/26/2004 Name: NORTH SHORE, BAY OF ST. LOUIS MS NOAA Chart: 11371 Latitude: 30° 22.4' N ( 30.37330) USGS Quad: BAY ST. LOUIS Longitude: 89° 19.3' W ( -89.32170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7398 D 1978 DESIGNATION: 874 7398 D TIDAL MONUMENTATION: Tidal Station disk VM#: 10441 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Sidewalk OPUS PID: LATITUDE: 30° 22.4' N ( 30.37330) LONGITUDE: 89° 19.3' W ( -89.32170) The bench mark is a disk set flush in a sidewalk north of the monastery, 77 m (251 ft) north of the NW corner of the monastery, 12.31 m (40.4 ft) NW of the intersection of the western north/south drive and the east/west drive north of the monastery, and 2 m (7.0 ft) west of the curb. BENCH MARK STAMPING: 7398 E 1978 DESIGNATION: 874 7398 E TIDAL MONUMENTATION: Tidal Station disk VM#: 10442 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 22.4' N ( 30.37330) LONGITUDE: 89° 19.3' W ( -89.32170) The bench mark is a disk located 79 m (260 ft) NNE of the intersection of the western north-south drive and the east-west drive, 69 m (228 ft) NE of bench mark 7398 D 1978, 42 m (139 ft) west of the centerline of the eastern north/south drive, 5.24 m (17.2 ft) east of the centerline of the western north/south drive, and 1 m (4 ft) east of the east road curb. The bench mark is set 0.18 m (0.6 ft) below ground level, crimped to the top of a stainless steel rod driven 21.9 m (72 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8747398 PUBLICATION DATE: 02/26/2004 Name: NORTH SHORE, BAY OF ST. LOUIS MS NOAA Chart: 11371 Latitude: 30° 22.4' N ( 30.37330) USGS Quad: BAY ST. LOUIS Longitude: 89° 19.3' W ( -89.32170) T I D A L D A T U M S Tidal datums at NORTH SHORE, BAY OF ST. LOUIS based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: November 1978 - January 1979 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8747437 BAY WAVELAND YC, BAY ST. LOUIS Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.542 MEAN HIGH WATER MHW = 0.494 MEAN SEA LEVEL MSL = 0.274 MEAN TIDE LEVEL MTL = 0.271 MEAN LOW WATER MLW = 0.048 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7398 A 1978 1.729 1.235 7398 B 1978 1.714 1.220 7398 C 1978 3.332 2.838 7398 D 1978 3.227 2.733 7398 E 1978 3.469 2.975
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8747398 PUBLICATION DATE: 02/26/2004 Name: NORTH SHORE, BAY OF ST. LOUIS MS NOAA Chart: 11371 Latitude: 30° 22.4' N ( 30.37330) USGS Quad: BAY ST. LOUIS Longitude: 89° 19.3' W ( -89.32170) 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.