U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8761426 PUBLICATION DATE: 03/09/2004 Name: GREENS DITCH, LAKE ST. CATHERINE LA NOAA Chart: 11369 Latitude: 30° 6.7' N ( 30.11170) USGS Quad: CHEF MENTEUR Longitude: 89° 45.6' W ( -89.76000) To reach the tidal bench marks from the SW end of the U.S. Highway 90 bridge over The Rigolets, proceed SW on U.S. Highway 90 for 7.1 km (4.4 mi) to the All in the Family Camp on the left. The bench marks are in the vicinity of the camp and along U.S. Highway 90. The tide gage and staff was located at the NE corner of the dock at the All in the Family Camp. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 1426A 1982 DESIGNATION: 876 1426 A MONUMENTATION: Tidal Station disk VM#: 6712 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 6.7' N ( 30.11170) LONGITUDE: 89° 45.6' W ( -89.76000) The primary bench mark is a disk located near the All in the Family camp, 69 m (228 ft) east of the centerline of U.S. Highway 90, 27 m (88 ft) west of the approximate high water mark of the west shore of Lake St. Catherine, 13 m (42 ft) WSW of a small frame pole house, 5 m (16 ft) north of the north side of the All in the Family Camp, and 2 m (5 ft) east of a 0.21 m (0.7 ft) diameter utility pole. The bench mark is set 0.1 m (0.3 ft) below gradel, crimped to the top of a stainless steel rod driven 18.3 m (60 ft) to substantial resistance, and encased in a 4-inch PVC collar and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8761426 PUBLICATION DATE: 03/09/2004 Name: GREENS DITCH, LAKE ST. CATHERINE LA NOAA Chart: 11369 Latitude: 30° 6.7' N ( 30.11170) USGS Quad: CHEF MENTEUR Longitude: 89° 45.6' W ( -89.76000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: E 92 1938 DESIGNATION: E 92 MONUMENTATION: Bench Mark disk VM#: 6710 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BH1147 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 7.2' N ( 30.12000) LONGITUDE: 89° 45.8' W ( -89.76330) The bench mark is a disk set in a concrete monument projecting 0.21 m (0.7 ft) above the ground surface located in the yard of a one-story frame house, 0.6 km (0.4 mi) north of bench mark E 193 1963, 40.81 m (133.9 ft) east of the centerline of U.S. Highway 90, 18.59 m (61.0 ft) north of the centerline of the driveway to the house, 7.01 m (23.0 ft) NNW of the NW corner of a mobile home, 3.69 m (12.1 ft) south of the center of a driveway, 0.30 m (1.0 ft) west of a witness post, and 1.58 m (5.2 ft) below the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8761426 PUBLICATION DATE: 03/09/2004 Name: GREENS DITCH, LAKE ST. CATHERINE LA NOAA Chart: 11369 Latitude: 30° 6.7' N ( 30.11170) USGS Quad: CHEF MENTEUR Longitude: 89° 45.6' W ( -89.76000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: E 193 1963 DESIGNATION: E 193 MONUMENTATION: Bench Mark disk VM#: 6711 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: BH1145 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 30° 6.8' N ( 30.11330) LONGITUDE: 89° 45.7' W ( -89.76170) The bench mark is a disk located south of the All in the Family camp, 40 m (132 ft) east of the centerline of U.S. Highway 90, 26.09 (85.6 ft) west of the NW cornerof a house, 11.00 m (36.1 ft) north of the centerline of a driveway, 0.79 m (2.6 ft) west of the utility pole #515 with a transformer, and 2.29 m (7.5 ft) below the highway. The bench mark is set 0.2 m (0.7 ft) below the ground, crimped to the top of a copper-clad steel rod driven 19.5 m (64 ft), and encased in a 4-inch tile pipe.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8761426 PUBLICATION DATE: 03/09/2004 Name: GREENS DITCH, LAKE ST. CATHERINE LA NOAA Chart: 11369 Latitude: 30° 6.7' N ( 30.11170) USGS Quad: CHEF MENTEUR Longitude: 89° 45.6' W ( -89.76000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1426B 1982 DESIGNATION: 876 1426 B MONUMENTATION: Tidal Station disk VM#: 6713 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 6.7' N ( 30.11170) LONGITUDE: 89° 45.6' W ( -89.76000) The bench mark is a disk located along the east side of U.S. Highway 90, 63 m (206 ft) WNW of bench mark 1426A 1982, 27 m (88 ft) south of the centerline of the shell driveway to the Shining camp house, 22 m (73 ft) NW of a 0.21 m (0.7 ft) diameter utility pole north of the All in the Family camp house, 22 m (71 ft) north of the centerline of the shell driveway to the All in the Family camp house, and 9 m (31 ft) east of the centerline of U.S. Highway 90. The bench mark is set 12 cm (0.4 ft) below grade, crimped to the top of a stainless steel rod driven 19.5 m (64 ft) to substantial resistance, and encased in a 4-inch PVC collar and concrete kickblock. BENCH MARK STAMPING: 1426C 1982 DESIGNATION: 876 1426 C MONUMENTATION: Tidal Station disk VM#: 6714 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 6.7' N ( 30.11170) LONGITUDE: 89° 45.6' W ( -89.76000) The bench mark is a disk located along the west side of U. S. Highway 90, 78 m (257 ft) NNW of bench mark 1426B 1982, 55 m (179 ft) east of the east shore of Bayou de Lesaire, 54 m (177 ft) NW of a house trailer, 25 m (81 ft) ENE of a utility pole, and 16 m (54 ft) west of the centerline of U.S. Highway 90. The bench mark is 0.1 m (0.3 ft) below grade, crimped to the top of a stainless steel rod driven 21.9 m (72 ft) to substantial resistance, and encased in a 4-inch PVC collar and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8761426 PUBLICATION DATE: 03/09/2004 Name: GREENS DITCH, LAKE ST. CATHERINE LA NOAA Chart: 11369 Latitude: 30° 6.7' N ( 30.11170) USGS Quad: CHEF MENTEUR Longitude: 89° 45.6' W ( -89.76000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1426D 1982 DESIGNATION: 876 1426 D MONUMENTATION: Tidal Station disk VM#: 6715 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 30° 6.7' N ( 30.11170) LONGITUDE: 89° 45.6' W ( -89.76000) The bench mark is a disk located along the east side of U.S. Highway 90, 76 m (248 ft) NNE of bench mark 1426C 1982, 49 m (162 ft) ENE of utility pole #517 B, 47 m (155 ft) south of utility pole #7 B, 14 m (46 ft) WSW of utility pole #6 E, and 9 m (29 ft) east of the centerline of U.S. Highway 90. The bench mark is set 0.1 m (0.3 ft) below grade, crimped to the top of a stainless steel rod driven 20.7 m (68 ft) to substantial resistance, and encased in a 4-inch PVC collar and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8761426 PUBLICATION DATE: 03/09/2004 Name: GREENS DITCH, LAKE ST. CATHERINE LA NOAA Chart: 11369 Latitude: 30° 6.7' N ( 30.11170) USGS Quad: CHEF MENTEUR Longitude: 89° 45.6' W ( -89.76000) T I D A L D A T U M S Tidal datums at GREENS DITCH, LAKE ST. CATHERINE based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: December 1982 - November 1983 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8761927 USCG NEW CANAL STA., LAKE PONT. Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (02/27/1983) = 0.807 MEAN HIGHER HIGH WATER MHHW = 0.239 MEAN HIGH WATER MHW = 0.231 MEAN SEA LEVEL MSL = 0.121 MEAN TIDE LEVEL MTL = 0.117 MEAN LOW WATER MLW = 0.004 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum NAVD88 = -0.099 LOWEST OBSERVED WATER LEVEL (02/03/1983) = -0.443 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 1426A 1982 0.414 0.183 E 92 1938 1.048 0.817 E 193 1963 0.925 0.694 1426B 1982 2.909 2.678 1426C 1982 2.882 2.651 1426D 1982 3.122 2.891
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8761426 PUBLICATION DATE: 03/09/2004 Name: GREENS DITCH, LAKE ST. CATHERINE LA NOAA Chart: 11369 Latitude: 30° 6.7' N ( 30.11170) USGS Quad: CHEF MENTEUR Longitude: 89° 45.6' W ( -89.76000) 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.