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Details for Benchmark: LX4218

N 41° 11.257 W 073° 57.921 (NAD 83)

Altitude: 823

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

Location:
In ROCKLAND county, NY View Original Datasheet
Designation:
HIGH TOR RESET
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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Found It

Located a few studs in the rock surrounding the former Air Beacon, which appeared to be reference marks for Hi-Tor. One of which was a fairly accurate reading as described in the original datasheet. Some of the oldest graffiti on this rock dates back to the 1970s when the most recent NGS log was entered. Lots of graffiti paint covers the entire site now, but the ruins remain. Very interesting site (and sight) for sure.

Explored benchmark area while hiking along the Long Path, blazed in aqua. The High Tor summit at 832 feet is the highest point of the Hudson Palisades. The area has many drill holes and broken-off rods, and the footings for the High Tor Beacon. Recovered reference marks 1 and 2, but could not find benchmark that matched the description in the datasheet.

[Photos:]
photoLX4218 RM 1
CB3562, High Tor RM 1, rod in drill hole in bedrock, shown in the center foreground. LX4216, High Tor Beacon, shown near the center top of the picture.
photoLX4218 RM 2
CB3563, High Tor RM 2, rod in drill hole in bedrock.
photoLX4218 RM 2 - area view
View of the benchmark area from High Tor RM 2, looking west. The southeast and southwest footings of the High Tor Beacon are shown on the left. On the right, the double aqua blaze for the Long Path indicates a left turn.

Found what is left of it near the old beacon site

Found while Geocaching in area

Please see the complete recovery, including text and photos, at my website: [url=http://surveymarks.planetzhanna.com/surveymarks/lx4218/][b]LX4218 - HIGH TOR RESET[/b][/url].

Zhanna

This entry was edited by Zhanna on Friday, 07 December 2012 at 02:24:10 UTC.

Documented History (by the NGS)

01/01/1851 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1851 (EB) POINT IS MARKED BY A HOLE IN ROCK. IT IS ABOUT A MILE S OF HAVERSTRAW AND IS ONE OF MOST ELEVATED SPOTS ON WESTERN SIDE OF HUDSON. IT IS POINT FROM WHENCE HIGHLAND ON RIVER TURNS TO NW.
01/01/1881 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1881 (FHG) STATION IS ON HIGHEST PEAK OF MOUNTAIN RANGE S OF HAVERSTRAW, CALLED HOOK MTS., ON YOUMEN ESTATE, CLARKSTOWN TOWNSHIP. A CEDAR POLE WITH A WHITE FLAG STANDING WAS FOUND AND SPOT WAS IDENTIFIED AS ORIGINAL ONE OF SIGNAL.
01/01/1931 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1931 (HLW) WE WERE ABLE TO LOCATE HIGH TOR, ALL POINTS FOUND TO BE IN FAIRLY GOOD CONDITION, AND UNDISTURBED.
01/01/1932 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1932 (CAE) STATION IS ON W SIDE OF HUDSON RIVER JUST S OF VILLAGE OF HAVERSTRAW, ON HIGHEST PART OF, AND NEAR BLUFF OVERLOOKING HUDSON RIVER, MOUNTAIN KNOWN LOCALLY AS TOR. THERE IS AN AERIAL-LIGHTED BEACON ON A STEEL TOWER A SHORT DISTANCE FROM STATION. ALL DRILL HOLES WERE RECOVERED. STATION WAS TAKEN TO BE AT INTERSECTION OF TWO LINES BETWEEN FOUR INNER DRILL HOLES. STATION WAS REMARKED BY A STANDARD BRONZE DISK CEMENTED IN BEDROCK. TWO STANDARD DISK REFERENCE MARKS WERE SET IN DRILL HOLES IN BEDROCK. ONE OF THESE MARKS WAS SET IN ONE OF OLD INNER DRILL HOLES WHILE OTHER WAS SET IN ONE OF OLD OUTER DRILL HOLES. SIGNAL, 2, TELESCOPE, 1-1/2 METERS.
01/01/1938 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (CDM) STATION WAS RECOVERED IN GOOD CONDITION. IT IS ON HIGHEST PART OF A BARE RIDGE RUNNING N AND S APPROXIMATELY 1 MILE S OF HAVERSTRAW, NEW YORK. MARK IS A STANDARD BRONZE DISK SET IN BEDROCK AND STAMPED HIGH TOR 1881 AND IS CENTER OF AN AIR BEACON. STATION WAS OCCUPIED ECCENTRICALLY. REFERENCE MARK NO.1 IS A STANDARD BRONZE DISK SET IN BEDROCK N OF STATION AND STAMPED HIGH TOR R.M. 1 1881 . REFERENCE MARK NO.2 IS A STANDARD BRONZE DISK SET IN BEDROCK AND STAMPED HIGH TOR R.M. 2 1881 E OF STATION. TO REACH FROM JUNCTION OF U.S. 9W AND N.Y.304 ABOUT 1.0 MILE S OF HAVERSTRAW, GO W ON 304, 0.55 MILE TO FORKS. BEAR R AND GO 0.25 MILE TO CROSS ROAD. WHERE MAIL ROAD TURNS L, KEEP STRAIGHT AHEAD 1.45 MILES TO PRIVATE PAVED ROAD R THROUGH TWO LARGE WOODEN GATES. HERE TURN R THROUGH GATES AND GO 50 YARDS TO WIRE GATE. PASS THROUGH WIRE GATE AND GO 0.15 MILE TO ROAD L MARKED TO THE STABLES. HERE TURN L AND GO 0.15 MILE TO STABLES (MR. FARRELL IN CHARGE OF STABLES. ESTATE IS OWNED BY MR. HUNTINGTON). HERE TURN R ON CINDER ROAD AND GO 0.05 MILE (AS FAR AS POSSIBLE) TO CROSS ROAD. TURN L AND GO 50 YARDS TO FORKS. BEAR R AND GO 100 YARDS TO AND THROUGH WIRE GATE. THEN CONTINUE AHEAD 0.9 MILE TO FORKS. HERE TURN SHARP R AND GO 0.2 MILE TO TWO SECONDARY ROADS, ONE BEARING R AND OTHER L. KEEP STRAIGHT AHEAD 0.7 MILE TO END OF TRUCK TRAVEL. FROM HERE PACK ALONG GOOD FOOT TRAIL 1/2 MILE TO STATION.
01/01/1964 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (CFK) THE STATION AND ALL MARKS WERE RECOVERED AND FOUND IN GOOD CONDITION. THE DISTANCES AND DIRECTIONS TO ALL MARKS CHECKED. THE AIR BEACON WHICH THE STATION WAS NEAR THE CENTER OF HAS BEEN TORN DOWN, A NEW BEACON WAS BUILT A FEW FEET NORTHWEST OF THE STATION, AND WAS TORN DOWN, BUT THE CONCRETE FOOTINGS ARE STILL IN TACT. A NEW DESCRIPTION FOLLOWS. THE STATION IS LOCATED ABOUT 1 MILE SOUTH OF HAVERSTRAW, ABOUT 1 MILE WEST OF THE HUDSON RIVER, AT THE TOP OF A BARE MOUNTAIN KNOWN AS HIGH TOR MOUNTAIN, AND ON THE PROPERTY OF THE PALISADES PARK. IT IS A STANDARD DISK STAMPED HIGH TOR 1881, CEMENTED IN A DRILLED HOLE IN OUTCROPPING BEDROCK WHICH COVERS THE ENTIRE TOP OF THE MOUNTAIN. IT IS 6 FEET EAST OF THE SOUTHWEST CONCRETE FOOTING OF THE RUINS OF AN AIR BEACON, 4 FEET WEST-SOUTHWEST OF THE SOUTHEAST CONCRETE FOOTING, AND IS NEAR THE HIGHEST POINT OF THE OUTCROPPING BEDROCK. TO REACH FROM THE JUNCTION OF STATE HIGHWAYS 59 AND 304 IN THE SOUTHEAST PART OF SPRING VALLEY, GO NORTH ON NORTH MIDDLETOWN ROAD FOR 1.7 MILES TO AN OVERPASS (PALISADES PARKWAY). CONTINUE NORTH ON NORTH LITTLE TOR ROAD FOR 2.05 MILES TO A CROSSROAD (HEMPSTEAD ROAD). CONTINUE NORTH ON NORTH LITTLE TOR ROAD FOR 2.5 MILES TO A CROSSROAD (SOUTH MOUNTAIN ROAD). CONTINUE NORTH ON NORTH LITTLE TOR ROAD FOR 0.8 MILES TO THE TOP OF A RIDGE AND AN IRON PIPE GATE ON THE RIGHT. TURN RIGHT AND GO EASTERLY ON A TRACK ROAD FOR 1 MILE TO AN ANGLING CROSSROAD. CONTINUE AHEAD EASTERLY ON THE TRACK ROAD FOR 1.25 MILES TO THE END OF THE TRACK ROAD. FROM THIS POINT PACK SOUTHEAST UP A STEEP BLUFF FOR ABOUT 0.1 MILE TO THE HIGHEST POINT OF THE MOUNTAIN AND THE STATION. REFERENCE MARK 1 IS A STANDARD DISK STAMPED HIGH TOR NO 1 1881, CEMENTED IN A DRILLED HOLE IN THE OUTCROPPING BEDROCK. IT IS 4.4 FEET WEST-NORTHWEST OF THE SOUTHEAST CONCRETE FOOTING OF THE AIR BEACON. REFERENCE MARK 2 IS A STANDARD DISK STAMPED HIGH TOR NO 2 1881, CEMENTED IN A DRILLED HOLE IN THE OUTCROPPING BEDROCK. IT IS 10.2 FEET EAST OF THE SOUTHEAST CONCRETE FOOTING OF THE AIR BEACON. HIGH TOR (USE) IS A U.S. ARMY CORPS OF ENGINEERS MAP CONTROL STATION. IT IS A 3 INCH IN DIAMETER BRASS DISK THAT IS NOT STAMPED, CEMENTED IN A DRILLED HOLE NEAR THE CENTER OF THE CONCRETE FOOTINGS OF THE RUINS OF THE AIR BEACON. HEIGHT OF LIGHT ABOVE STATION MARK 1.54 METERS.
01/01/1964 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (GB) STATION HIGH TOR 1851 IS A STD. BRONZE DISC SET IN BEDROCK ATOP HIGH TOR MT, A LOCALLY WELL KNOWN BARE TOP RIDGE ABOUT 1 MILE SOUTH OF HAVERSTRAW, N.Y. FROM THE INTERSECTION OF RT 9-W AND RT 202 IN HAVERSTRAW N.Y. PROCEED WESTERLY ON RT 202 ABOUT 0.5 MILES TO CENTRAL HIGHWAY THENCE SOUTHWESTERLY ON CENTRAL HIGHWAY ABOUT 1.7 MILES TO THE CREST OF THE RIDGE. THENCE SOUTHEASTERLY THROUGH A STEEL BARWAY ALONG A DIRT ROAD + OR - 2 MILES TO A POINT WHERE THE ROAD ENDS. FOLLOW THE STEEP TRAIL TO THE TOP OF THE BARE ROCKY RIDGE WHERE THE STATION LIES EMBEDDED IN ROCK.
01/01/1966 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1966 (JLC) THE STATION AND ALL MARKS WERE RECOVERED AND FOUND IN GOOD CONDITION. THE 1964 RECOVERY NOTE BY C.F.K. ADEQUATELY DESCRIBES THE STATION AND THE TO REACH IS GOOD.
01/01/1975 by NGS (SEE DESCRIPTION)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1975 (RFH) ALL MARKS WERE RECOVERED IN GOOD CONDITION AS DESCRIBED IN 1964. STATION IS ON A BARE RIDGE AND VIEW IS OPEN IN ALL DIRECTIONS. DISTANCE AND ANGLES TO REFERENCE MARKS WERE NOT CHECKED. THE 1964 DESCRIPTION TO REACH STATION IS ADEQUATE. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN 3/4-MILE SOUTH OF HAVERSTRAW.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in January 1999.
  • 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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