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Details for Benchmark: BJ1342

N 30° 01.609 W 090° 06.770 (NAD 83)

Altitude: 6.59

Coordinates may not be exact. Altitude is ADJUSTED and location is ADJUSTED. (more info)

Location:
In ORLEANS county, LA View Original Datasheet
Designation:
ALCO
Marker Type:
triangulation station disk
Setting:
massive retaining walls
Stability:
Probably hold position/elevation well.

Reference Points

Must Read!

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Found it 8/17/2013 nje found BJ1342   Visit Log
Worked my way along the south shore of Lake Ponchartrain on a very windy day.
[Photos:]
photoBJ1342
photoBJ1342 location
Found it 4/13/2012 MetalKitty found BJ1342   Visit Log
Found as described.
[Photos:]
photoAlcoa TRI
ALCO is Alive.
Found it 9/27/2010 BrewSleuth found BJ1342   Visit Log
Took a walk along the seawall to log benchmarks this evening.
[Photos:]
photoDSCF1870
Found it 4/27/2007 Oilman found BJ1342   Visit Log
Found it, Coodinates correct. Took a few pics.

Oilman
[Photos:]
photoBenchmark
photoLooking towards destroyed lighthouse
Found it 11/9/2005 GatorGrl found BJ1342   Visit Log
Forgot to log this one a while back, but saw it again today; looks like they're recalibrating it. BM in good condition sitting atop seawall.
[Photos:]
photoRecalibration in progress...
photoAs close as I got to the BM

Documented History (by the NGS)

1/1/1931 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1931 (RLS) NEAR THE WEST END LIGHTHOUSE, ON THE LAKE PONTCHARTRAIN SEA-WALL IN ZONE 1, WHICH LIES BETWEEN THE ORLEANS CANAL AND THE NEW BASIN CANAL, AND IN THE 132ND BAY COUNTING FROM THE ORLEANS CANAL. THE STATION IS MARKED BY A STANDARD BRONZE DISK WHICH IS SET FLUSH WITH THE TOP SURFACE OF THE TOP COPING. THE REFERENCE MARK, A STANDARD BRONZE DISK, IS S 77 DEG 38 MIN E. THE CROSS ON THE MOUNT CARMEL CONVENT IS S 19 DEG 56 MIN E.
1/1/1935 by LAGS (GOOD)
RECOVERY NOTE BY LOUISIANA GEODETIC SURVEY 1935 STATION RECOVERED AS DESCRIBED.
1/1/1942 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1942 (HCW) STATION WAS RECOVERED AS DESCRIBED IN EVERY DETAIL. THE DISTANCES AND DIRECTIONS TO AZIMUTH MARKS WERE NOT CHECKED. NEAR THE WEST END LIGHTHOUSE, ON THE LAKE PONTCHARTRAIN SEA-WALL IN ZONE 1, WHICH LIES BETWEEN THE ORLEANS CANAL AND THE NEW BASIN CANAL, AND IN THE 132ND BAY COUNTING FROM THE ORLEANS CANAL. THE STATION IS MARKED BY A STANDARD BRONZE DISK WHICH IS SET FLUSH WITH THE TOP FURFACE OF THE TOP COPING. THE REFERENCE MARK, A STANDARD BRONZE DISK, IS S 77 DEG 38 MIN E. THE CROSS ON THE MOUNT CARMEL CONVENT IS S 19 DEG 56 MIN E.
1/1/1953 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1953 (RLE) STATION AND REFERENCE MARK WERE RECOVERED IN GOOD CONDITION. A NEW DESCRIPTION FOLLOWS-- STATION IS LOCATED ON THE LAKE PONTCHARTRAIN SEAWALL, JUST E OF A U.S. COAST GUARD STATION. IT IS A STANDARD BRONZE DISK, STAMPED ALCO 1931 AND CEMENTED IN A DRILL HOLE IN THE TOP OF A CONCRETE SEAWALL. THE REFERENCE MARK IS A STANDARD BRONZE DISK, STAMPED ALCO 1931 AND CEMENTED IN A DRILL HOLE IN THE TOP OF A CONCRETE SEAWALL. TO REACH THE STATION FROM THE INTERSECTION OF LAKESHORE DRIVE AND CANAL BOULEVARD, GO W ON LAKESHORE DRIVE ALONG THE SEAWALL FOR 0.4 MI. TO THE STATION ON THE RIGHT AS DESCRIBED JUST E OF THE COAST GUARD STATION.
1/1/1954 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1954 (RAE) THE STATION IS LOCATED IN THE NW SECTION OF NEW ORLEANS, NEAR THE MOUTH OF NEW CANAL, 150 FT. SE OF NEW CANAL LIGHTHOUSE, AND ON THE S SHORE OF LAKE PONCHARTRAIN. IT IS 46 PACES E OF THE W END OF THE SEAWALL, AND 132 BAYS W OF ORLEANS CANAL. IT IS A STANDARD DISK, SET IN A DRILL HOLE IN THE TOP OF THE SEAWALL. IT IS STAMPED ALCO 1931. THE REFERENCE MARK IS W OF THE STATION S 77 DEG 38 MIN W. IT IS 13 PACES E OF THE W END OF THE SEAWALL. IT IS A STANDARD DISK, SET IN A DRILL HOLE IN THE TOP OF THE SEAWALL, AND STAMPED ALCO 1931.
1/1/1963 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1963 IN NEW ORLEANS. AT NEW ORLEANS, AT WEST END, NEAR THE NORTH END OF WEST END BOULEVARD, NEAR THE COAST GUARD STATION, SET IN THE TOP OF THE SEA WALL ALONG SHORE OF LAKE PONTCHARTRAIN, 112 FEET NORTHWEST OF THE CENTER LINE OF LAKESHORE DRIVE, 115 FEET EAST OF THE WEST END OF THE SEA WALL, 70 FEET EAST OF A STEEL FENCE CORNER POST ON TOP OF THE SEA WALL AND IS ABOUT 2 FEET ABOVE THE DRIVE.
1/1/1964 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (RRG) THE STATION AND ONE REFERENCE MARK WAS FOUND AND IN GOOD CONDITION. THE STATION IS LOCATED ALONG THE SEA WALL ALONG THE SHORE OF LAKE PONTCHARTRAIN, NEAR THE COAST GUARD STATION, 112 FEET NORTHWEST OF THE CENTER LINE OF LAKESHORE DRIVE, 115 FEET EAST OF THE WEST END OF THE SEA WALL, 70 FEET EAST OF A STEEL FENCE POST IN SEA WALL AND ABOUT 2 FEET ABOVE THE LEVEL OF THE DRIVE. THE REFERENCE MARK IS 87 FEET WEST OF THE STATION AND SET ON TOP OF THE SEA WALL. 23 FEET EAST OF THE WEST END OF THE WALL AND 2 FEET ABOVE THE LEVEL OF THE DRIVE,
1/1/1981 by USGS (MARK NOT FOUND)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1981 MARK NOT FOUND.
1/1/1985 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1985 (JCM) ALCO--1931 FOUND GOOD. DESCRIPTION ADEQUATE. REFERENCE MARK FOUND GOOD. LOCATED ON TOP SURFACE OF SEA WALL 87 FEET WEST OF STATION, APPROX. TWO FEET WEST OF US COAST GUARD DRIVEWAY GATE, UNDER CYCLONE FENCE.
1/1/1985 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1985 RECOVERED IN GOOD CONDITION, THE 1963 RECOVERY IS ADEQUATE WITH THE FOLLOWING ADDITION, ADD--7.07 METERS (23.2 FT) NORTH-NORTHEAST OF STEEL LAMP POST 500.
1/1/1987 by LADTD (GOOD)
RECOVERY NOTE BY LA TRANSP AND DEV 1987 (TLH) THE DESIGNATED MARK WAS RECOVERED WITH CHANGES NOTED BELOW-- A COMPLETE NEW DESCRIPTION WAS MADE THIS DATE. THE STATION IS LOCATED ABOUT 7 KM (4.4 MI) NORTH OF INTERSTATE HIGHWAY 10, NEAR THE U.S. COAST GUARD STATION AT LAKE PONCHATRAIN. OWNERSHIP--ORLEANS PARISH LEVEE BOARD, SUITE 202, ADMINISTRATION BUILDING, LAKEFRONT AIRPORT, NEW ORLEANS, LA. PHONE 504-246-4000. TO REACH THE STATION FROM THE JUNCTION OF INTERSTATE HIGHWAY 10 AND CAUSEWAY BOULEVARD, GO NORTH FOR 0.55 KM (0.35 MI) ON CAUSEWAY BOULEVARD TO VETERANS MEMORIAL HIGHWAY. TURN RIGHT AND GO EAST FOR 3.89 KM (2.4 MI) ON VETERANS MEMORIAL BOULEVARD TO PONCHATRAIN BOULEVARD. TURN LEFT AND GO NORTH FOR 1.85 KM (1.15 MI) ON PONCHATRAIN BOULEVARD TO ROBERT E LEE BOULEVARD. CONTINUE STRAIGHT AHEAD AND GO NORTH FOR 0.72 KM (0.45 MI) ON ROBERT E LEE BOULEVARD TO THE COAST GUARD STATION ENTRANCE ON THE LEFT AT THE EAST END OF A CURVE IN THE ROAD. TURN LEFT ONTO A NARROW LANE FOR 30 METERS (100 FT) TO THE STATION ON THE RIGHT. THE STATION IS A STANDARD CGS DISK STAMPED---ALCO 1931---, SET INTO A DRILL HOLE IN THE TOP STEP OF THE SEAWALL. 21.2 METERS (69.5 FT) EAST FROM THE EAST GATE POST AT THE ENTRANCE TO THE COAST GUARD STATION, 7.2 METERS (23.6 FT) NORTHEAST FROM A METAL LIGHT POLE, AND 4.6 METERS (15.1 FT) WEST FROM A SEAM IN THE SEAWALL.
1/1/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (WFT) RECOVERED IN GOOD CONDITION.
9/20/1988 by LADTD (GOOD)
RECOVERY NOTE BY LA TRANSP AND DEV 1988 THE STATION IS LOCATED ABOUT 7 KM (4.35 MI) NORTH OF INTERSTATE HIGHWAY 10, NEAR THE U.S. COAST GUARD STATION AT LAKE PONTCHATRAIN. OWNERSHIP--ORLEANS PARISH LEVEE BOARD, SUITE 202, ADMINISTRATION BUILDING, LAKEFRONT AIRPORT, NEW ORLEANS, LA. PHONE 504-246-4000. TO REACH THE STATION FROM THE JUNCTION OF INTERSTATE HIGHWAY 10 AND CAUSEWAY BOULEVARD, GO NORTH FOR 0.55 KM (0.35 MI) ON CAUSEWAY BOULEVARD TO VETERANS MEMORIAL HIGHWAY, TURN RIGHT AND GO EAST FOR 3.89 KM (2.40 MI) ON VETERANS MEMORIAL BOULEVARD TO WEST END BLVD, TURN LEFT AND GO NORTH ON WEST END BLVD FOR 2.57 KM (1.60 MI) TO THE COAST GUARD STATION ENTRANCE ON THE LEFT AT THE EAST END OF A CURVE IN THE ROAD. TURN LEFT ONTO A NARROW LANE FOR 30 METERS (98.4 FT) TO THE STATION ON THE RIGHT, 21.2 M (69.6 FT) EAST FROM THE EAST GATE POST AT THE ENTRANCE TO THE COAST GUARD STATION, 7.2 M (23.6 FT) NORTHEAST FROM A METAL LIGHT POLE, AND 4.6 M (15.1 FT) WEST FROM A SEAM IN THE SEAWALL.
1/17/1989 by (GOOD)
RECOVERED 1989 RECOVERED IN GOOD CONDITION.
11/8/1990 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990 IN NEW ORLEANS, AT 800 LAKESHORE DRIVE, IN A CONCRETE RETAINING WALL ALONG THE SOUTH SHORE OF LAKE PONTCHARTRAIN, 38.8 M (127.3 FT) EAST-SOUTHEAST OF THE SOUTHEAST CORNER OF A LIGHTHOUSE AT 800 LAKESHORE DRIVE, 35.0 M (114.8 FT) EAST OF THE WEST END OF THE RETAINING WALL, 34.1 M (111.9 FT) NORTHWEST OF THE CENTERLINE OF THE DRIVE, 23.9 M (78.4 FT) EAST OF THE CENTER OF A DRIVEWAY, 21.3 M (69.9 FT) EAST OF A STEEL FENCE CORNER POST ON TOP OF THE SEA WALL, 7.1 M (23.3 FT) NORTH-NORTHEAST OF UTILITY LIGHT POLE NUMBER 500, AND 0.6 M (2.0 FT) ABOVE THE LEVEL OF THE DRIVE.
10/16/1991 by LADTD (GOOD)
RECOVERY NOTE BY LA TRANSP AND DEV 1991 THE STATION IS LOCATED IN NORTHWEST NEW ORLEANS, NEAR THE U.S. COAST GUARD STATION ON THE SOUTH SHORE OF LAKE PONCHATRAIN. OWNERSHIP--ORLEANS PARISH LEVEE BOARD, SUITE 202, ADMINISTRATION BUILDING, LAKEFRONT AIRPORT, NEW ORLEANS, LA. PHONE 504-246-4000. TO REACH THE STATION FROM THE JUNCTION OF INTERSTATE HIGHWAY 10 AND CAUSEWAY BOULEVARD, GO NORTH FOR 0.35 MI (0.56 KM) ON CAUSEWAY BOULEVARD TO THE JUNCTION WITH VETERANS MEMORIAL BOULVARD, TURN RIGHT AND GO EAST FOR 2.4 MI (3.9 KM) ON VETERANS BOULEVARD TO THE JUNCTION WITH WEST END BOULEVARD, TURN LEFT AND GO NORTH FOR 1.6 MI (2.6 KM) ON WEST END BOULEVARD WHICH TURNS INTO LAKESHORE DRIVE TO THE COAST GUARD STATION ON THE LEFT AND STATION MARK ON THE LEFT SET IN THE SEAWALL. THE STATION IS 123.0 FT (37.5 M) NORTH-NORTHWEST FROM THE CENTER OF LAKESHORE DRIVE, 69.5 FT (21.2 M) EAST-NORTHEAST FROM THE EAST GATE POST AT THE ENTRANCE OF THE COAST GUARD STATION, 23.5 FT (7.2 M) NORTHEAST FROM A METAL LIGHT POLE, 32.5 FT (9.9 M) NORTH FROM THE CENTER OF THE DRIVE INTO THE COAST GUARD STATION, 15.0 FT (4.6 M) WEST-SOUTHWEST FROM A SEAM IN THE SEA WALL, FLUSH WITH THE TOP OF THE SEAWALL AND ABOUT LEVEL WITH THE ROAD.
11/24/1992 by NOS (GOOD)
RECOVERY NOTE BY NATIONAL OCEAN SERVICE 1992 RECOVERED IN GOOD CONDITION.
3/3/1993 by NOS (GOOD)
RECOVERY NOTE BY NATIONAL OCEAN SERVICE 1993 RECOVERED IN GOOD CONDITION.
11/17/1994 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1994 (GAS) IN NEW ORLEANS, AT 8001 LAKESHORE DRIVE, IN A CONCRETE RETAINING WALL ALONG THE SOUTH SHORE OF LAKE PONTCHARTRAIN, 36.7 M (120.4 FT) SOUTHEAST OF THE SOUTHEAST CORNER OF THE U.S. COAST GUARD LIGHT HOUSE AT 8001 LAKESHORE DRIVE, 27.3 M (89.6 FT) EAST OF ALCO REFERENCE MARK, 9.9 M (32.5 FT) NORTH-NORTHEAST OF AND LEVEL WITH THE CENTER OF THE LIGHTHOUSE ENTRANCE DRIVE, AND 7.2 M (23.6 FT) NORTHEAST OF A UTILITY LIGHT POLE.
1/30/1996 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1996 (RPB) RECOVERED AS DESCRIBED.
2/18/1996 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1996 (RPB) RECOVERED AS DESCRIBED.
2/13/1998 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (CSM) RECOVERED AS DESCRIBED.
3/9/1998 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (CSM) RECOVERED AS DESCRIBED.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in September 1992.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in December 1996.
  • This Tidal Bench Mark is designated as VM 832 by the Center for Operational Oceanographic Products and Services.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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