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Details for Benchmark: LX6820

N 41° 34.878 W 072° 37.134 (NAD 83)

Altitude: 357

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

Location:
In MIDDLESEX county, CT View Original Datasheet
Designation:
MCAULIFFE
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

Must Read!

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Didn't find any disks, but did find a witness post as described. Lots of expansion of the fields for the High School.

[Photos:]
photobenchmark LX6820 witness post
photobenchmark LX6820 witness post close

Documented History (by the NGS)

01/01/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 (GCM) THE STATION IS REACHED FROM THE PORTLAND TOWN HALL. GO NORTHERLY ON MAIN STREET 1.0 MILE, TURN RIGHT ON WILLIAMS STREET AND GO 0.6 MILE TO MRS. NELLIE MC AULIFFES HOUSE, BEAR RIGHT INTO PRIVATE ROAD AND GO 0.15 MILE ALONG THE EDGE OF A TOBACCO FIELD TO THE TOP OF HALL OR CROW HILL. THE STATION IS MARKED BY A STANDARD DISK SET IN THE TOP OF A 12- BY 12- BY 30-INCH CONCRETE BLOCK FLUSH WITH THE GROUND IN THE EDGE OF THE WOODS ABOUT 10 METERS EASTERLY OF THE ROAD. THE SUB-SURFACE MARK IS A STANDARD DISK SET IN AN IRREGULAR MASS OF CONCRETE. SURFACE, UNDERGROUND, AND REFERENCE MARK NO. 2 ARE STANDARD BRONZE DISKS SET IN CONCRETE AS DESCRIBED IN NOTES 1A, 7A, AND 11A. REFERENCE MARKS NOS. 1 AND 3 ARE STANDARD BRONZE DISKS IN OUTCROPPING BEDROCK AS DESCRIBED IN NOTE 12A. REFERENCE MARK NO. 1 IS A STANDARD DISK SET IN A DRILL HOLE IN LEDGE N 80 DEG W OF THE STATION AND NEAR THE W EDGE OF THE ROAD. REFERENCE MARK NO. 2 IS A STANDARD DISK SET IN A 12- BY 12- BY 30-INCH CONCRETE POST N 20 DEG E OF THE STATION. REFERENCE MARK NO. 3 IS A STANDARD DISK SET IN A DRILL HOLE IN LEDGE ACROSS THE TOBACCO FIELD N 75 DEG W OF THE STATION AND NEAR THE WOODS. HEIGHT OF LIGHT ABOVE STATION MARK 18 METERS.
01/01/1943 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943 (GWL) STATION AND REFERENCE MARKS WERE RECOVERED AS DESCRIBED. ALL WERE IN GOOD CONDITION. STATION PROJECTS 6 INCHES AND IS STAMPED MC AULIFFE 1934. REFERENCE MARK 1 IS FLUSH WITH THE SURFACE OF THE GROUND AND IS STAMPED MC AULIFFE NO. 1 1934. REFERENCE MARK 2 PROJECTS 6 INCHES AND IS STAMPED MC AULIFFE NO. 2 1934. REFERENCE MARK 3 IS STAMPED MC AULIFFE NO. 3 1934. A 50-FOOT TOWER WILL SEE A 4-FOOT LIGHT AT HOFMAN 1935. A 50-FOOT TOWER WILL SEE A 4-FOOT LIGHT AT HIGBY (CONN. GEOD.S.) A 50-FOOT TOWER WILL SEE A 47-FOOT LIGHT AT WEST PEAK (CONN. GEOD.S.) ECC.
01/01/1948 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1948 (RJS) THE STATION AND REFERENCE MARKS WERE RECOVERED AS DESCRIBED. THE DESCRIPTION IS ADEQUATE WITH THE FOLLOWING EXCEPTIONS-- 1. PROPERTY IS OWNED BY R.J. BUCKLEY AND OCCUPIED BY P.W. BUCKLEY. 2. THE PRIVATE ROAD IS NOW OVERGROWN. PROCEED 0.15 MILE BY FOOT.
01/01/1971 by CTDT (SEE DESCRIPTION)
RECOVERY NOTE BY CT DEPT OF TRANSP 1971 THE STATION AND REFERENCE MARK 1, REFERENCE MARK 2 WERE FOUND IN GOOD CONDITION. REFERENCE MARK 3 WAS NOT FOUND AND BELIEVED TO BE KNOCKED OUT BY SCHOOL CONSTRUCTION.
01/01/1976 by NGS (SEE DESCRIPTION)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 (JLC) THE STATION MARK, REFERENCE MARKS 1 AND 2 WERE RECOVERED IN GOOD CONDITION. REFERENCE MARK 3 WAS NOT RECOVERED. THE DIRECTION TO REFERENCE MARK 1 WAS FOUND TO BE LESS BY 01 MINUTE AND 12 SECONDS. THE DIRECTION TO REFERENCE MARK 2 WAS FOUND TO TO BE GREATER BY 01 MINUTE AND 16 SECONDS. THE DISTANCE TO REFERENCE MARK 1 WAS FOUND LONGER BY 0.020 OF A METER AND THE DISTANCE TO REFERENCE MARK 2 WAS FOUND LONGER BY 0.020 OF A METER. A COMPLETE NEW DESCRIPTION FOLLOWS. THE STATION IS ABOUT 2 MILES NORTHEAST OF MIDDLETOWN, 1-1/2 MILES NORTHEAST OF THE BRIDGE OVER THE CONNECTICUT RIVER BETWEEN MIDDLETOWN AND PORTLAND, 1 MILE NORTHEAST OF PORTLAND, 1 MILE NORTHWEST OF THE JUNCTION OF STATE HIGHWAYS 17 AND 66, AT THE SOUTHEAST EDGE OF THE PORTLAND HIGH SCHOOL GROUNDS AND ON PROPERTY OWNED BY THE CITY OF PORTLAND. TO REACH THE STATION FROM THE CENTER OF THE BRIDGE OVER THE CONNECTICUT RIVER BETWEEN MIDDLETOWN AND PORTLAND, GO EAST AND NORTH ON STATE HIGHWAYS 17 AND 66 FOR 0.3 MILE TO THE JUNCTION OF STATE HIGHWAY 17A. TURN RIGHT AND GO EAST ON STATE HIGHWAYS 17 AND 66 FOR 2.2 MILES TO WHERE HIGHWAY 17 TURNS LEFT. TURN LEFT AND GO NORTHERLY ON HIGHWAY 17 FOR 0.35 MILE TO A CROSSROAD (AMES HOLLOW ROAD TO THE RIGHT AND WILLIAMS ROAD TO THE LEFT). TURN LEFT AND GO WESTERLY UPHILL ON WILLIAMS ROAD FOR 0.9 MILE TO THE JUNCTION OF HIGH STREET. TURN LEFT AND GO SOUTHWESTERLY ON HIGH STREET FOR 0.25 MILE TO THE JUNCTION OF BUTLER LANE ON THE LEFT. TURN LEFT AND GO SOUTHEAST AND SOUTH ON BUTLER LANE FOR 0.1 MILE TO THE NORTHWEST CORNER OF A SCHOOL BUILDING AND A PAVED DRIVE LEADING TO AN ATHLETIC FIELD. TURN LEFT ONTO THE PAVED DRIVE AND GO SOUTHEAST FOR ABOUT 200 FEET TO A FENCE AROUND THE ATHLETIC FIELD. TURN LEFT AND FOLLOW THE FENCE AROUND THE ATHLETIC FIELD TO THE OTHER END AND THE STATION ON THE LEFT IN THE WOODS AS DESCRIBED. STATION MARKS, STAMPED---MCAULIFFE 1934---, ARE STANDARD DISKS. THE SURFACE DISK IS SET IN TOP OF A 12-INCH SQUARE CONCRETE POST WHICH PROJECTS ABOUT 4 INCHES ABOVE THE GROUND SURFACE. THE UNDERGROUND DISK IS SET IN AN IRREGULAR MASS OF CONCRETE BELOW THE GROUND SURFACE (DEPTH NOT KNOWN). THEY ARE 194 FEET SOUTHEAST OF THE FENCE AROUND THE ATHLETIC FIELD, 75 FEET EAST OF A METAL WITNESS POST, 41 FEET NORTHEAST OF A 20-INCH OAK TREE AND 20 FEET SOUTHEAST OF A 16-INCH OAK TREE. REFERENCE MARK 1, STAMPED---MCAULIFFE NO 1 1934---, IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN A ROCK OUTCROP WHICH IS ABOUT 6 INCHES BELOW THE GROUND SURFACE. IT IS 110 FEET SOUTHEAST OF THE FENCE AROUND THE ATHLETIC FIELD, 28 FEET SOUTHWEST OF CENTER OF A WOODS ROAD AND 16.5 FEET WEST OF A METAL WITNESS POST. REFERENCE MARK 2, STAMPED---MCAULIFFE NO 2 1934---, IS A STANDARD DISK SET IN TOP OF A 12-INCH SQUARE CONCRETE POST WHICH IS FLUSH WITH THE GROUND SURFACE. IT IS 79 FEET SOUTHWEST OF A PAVED DRIVEWAY, 14.5 FEET SOUTHEAST OF A DOUBLE TRUNK TREE, 9 FEET EAST OF A DOUBLE TRUNK TREE AND 3 FEET NORTHWEST OF A METAL WITNESS POST. NO SUITABLE PLACE WAS FOUND TO SET AN AZIMUTH MARK. HEIGHT OF LIGHT SHOWN ABOVE THE STATION WAS 26.2 METERS. DESCRIBED BY E.L. WORD.
01/01/1978 by NGS (SEE DESCRIPTION)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 (GEL) THE STATION MARK, REFERENCE MARKS 1 AND 2 WERE RECOVERED IN GOOD CONDITION. THE DISTANCE AND DIRECTION TO THE REFERENCE MARKS CHECKED THE 1976 DATA. A COMPLETE NEW DESCRIPTION FOLLOWS. THE STATION IS LOCATED ABOUT 2 MILES NORTHEAST OF MIDDLETOWN, 1-1/2 MILES NORTHEAST OF THE BRIDGE OVER THE CONNECTICUT RIVER, (BETWEEN MIDDLETOWN AND PORTLAND), 1 MILE NORTHEAST OF PORTLAND, 1 MILE NORTHWEST OF THE JUNCTION OF STATE HIGHWAYS 17 AND 66, AT THE SOUTHEAST EDGE OF THE PORTLAND HIGH SCHOOL GROUNDS AND ON PROPERTY OWNED BY THE CITY OF PORTLAND. TO REACH THE STATION FROM THE CENTER OF THE BRIDGE OVER THE CONNECTICUT RIVER, BETWEEN MIDDLETOWN AND PORTLAND, GO EAST AND NORTH ON STATE HIGHWAYS 17 AND 66 FOR 0.3 MILE TO THE JUNCTION OF STATE HIGHWAY 17A. TURN RIGHT AND GO EAST ON HIGHWAYS 17 AND 66 FOR 2.0 MILES TO WHERE HIGHWAY 17 TURNS LEFT. TURN LEFT AND GO NORTHERLY ON HIGHWAY 17 FOR 0.4 MILES TO A CROSSROAD (AMES HOLLOW ROAD TO THE RIGHT AND WILLIAMS ROAD TO THE LEFT). TURN LEFT AND GO WESTERLY UPHILL ON WILLIAMS ROAD FOR 0.9 MILE TO THE JUNCTION OF HIGH STREET. TURN LEFT AND GO SOUTHERLY ON HIGH STREET FOR 0.25 MILE TO THE JUNCTION OF BUTLER LANE ON THE LEFT. TURN LEFT AND GO SOUTHEAST AND SOUTH ON BUTLER LANE FOR 0.1 MILE TO THE NORTHWEST CORNER OF A SCHOOL BUILDING AND A PAVED DRIVE LEADING TO AN ATHLETIC FIELD. TURN LEFT ONTO THE PAVED DRIVE AND GO SOUTHEAST FOR ABOUT FOR ABOUT 200 FEET TO A FENCE AROUND THE ATHLETIC FIELD. TURN LEFT AND FOLLOW THE FENCE AROUND THE ATHLETIC FIELD FOR 0.2 MILE TO THE OTHER END OF FIELD AND THE STATION ON THE LEFT IN THE WOODS AS DESCRIBED. THE STATIONS MARKS ARE STANDARD DISKS STAMPED---MCAULIFFE 1934---. THE SURFACE DISK IS SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT WHICH PROJECTS 4 INCHES ABOVE THE GROUND SURFACE AND HAS A METAL ROD DRIVEN IN THE GROUND BESIDE THE STATION. IT IS 88.6 FEET EAST OF A WITNESS POST, 40.5 FEET NORTHEAST OF A 20-INCH OAK TREE AND 20.7 FEET SOUTHEAST OF A-16 INCH OAK TREE. THE OLD DATA STATES THERE IS AN UNDERGROUND DISK. REFERENCE MARK 1, A STANDARD DISK STAMPED---MCAULIFFE NO 1 1934---, IS CEMENTED IN A DRILL HOLE IN A ROCK OUTCROP WHICH PROJECTS 3 INCHES ABOVE THE GROUND SURFACE. IT IS 110 FEET SOUTHEAST OF THE FENCE AROUND THE ATHLETIC FIELD, 28 FEET SOUTHWEST OF A WOODS ROAD AND 3.8 FEET NORTH-NORTHWEST OF A METAL WITNESS POST. REFERENCE MARK 2, A STANDARD DISK STAMPED---MCAULIFFE NO 2 1934---, IS SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT, FLUSH WITH THE GROUND SURFACE. IT IS 81 FEET SOUTHWEST OF A PAVED DRIVEWAY, 14.9 FEET EAST-SOUTHEAST OF A 10-INCH DOUBLE TRUNKED TREE, 9.3 FEET WEST OF AN 8-INCH DOUBLE TRUNKED MAPLE TREE AND 2.9 FEET NORTHWEST OF A METAL WITNESS POST. THE HEIGHT OF LIGHT ABOVE THE STATION MARK WAS 26.4 METERS. NO SUITABLE LOCATION WAS FOUND TO SET A DISTANT REFERENCE MARK OR AN AZIMUTH MARK. DESCRIBED BY RONALD L. RAMSEY.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in August 1998.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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