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Details for Benchmark: LX6523

N 41° 19.705 W 072° 54.413 (NAD 83)

Altitude: 344

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

Location:
In NEW HAVEN county, CT View Original Datasheet
Designation:
EAST ROCK 2
Marker Type:
bolt
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

Reference Points

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Found the station bolt and 2 RM's as described.

[Photos:]
photobenchmark LX6523 - Station iron bolt
photobenchmark LX6523 - Station iron bolt close
photobenchmark LX6523 - RM 1
photobenchmark LX6523 - RM 1 close
photobenchmark LX6523 - RM 2
photobenchmark LX6523 - RM 2 close
photobenchmark LX6523 view
Looking out toward Hew Haven harbor from station mark
photobenchmark LX6523 Yale view
Looking toward Yale University and Harkness Tower from station mark.

Found bolt and it is less than 3 feet from an NGS disk stamped No. 1 1933

Documented History (by the NGS)

01/01/1871 by CGS (MONUMENTED)
01/01/1910 by CGS (SEE DESCRIPTION)
DESCRIBED BY COAST AND GEODETIC SURVEY 1910 (HPR) NO TRACES OF THE ORIGINAL STATION COULD BE FOUND, AND EAST ROCK 2 WAS THEREFORE ESTABLISHED. STATION IS ABOUT 1-1/2 MILES FROM NEW HAVEN, ABOUT 1/5 MILE W OF THE HOUSE KEPT BY M.J. STEWART UPON TOP OF HILL, AT END OF WAGON ROAD LEADING UP ROCK. IN 1910 REPORTED THAT EAST ROCK PARK IN WHICH STATION WAS LOCATED MIGHT BE REACHED BY EITHER THE STATE STREET OR WHITNEY AVENUE TROLLEY LINES. GRADED FOOTPATHS AND A ROAD FOR VEHICLES (AUTOMOBILES EXCEPTED - 1910) LEAD TO THE STATION. STATION MARKED BY A 4-INCH IRON BOLT SET IN SULPHUR IN A DRILL HOLE IN THE ROCK. STATION IS ABOUT 20.3 FEET N OF LARGE FLAGPOLE IN PARK. IT IS SURROUNDED BY BUSHES WHICH MAY PREVENT ITS USE AS A STATION. A CEDAR TREE IS 26.5 FEET FROM STATION, 17 DEG 45 MIN TO LEFT OF LINE TO NEW HAVEN LIGHTHOUSE. A CHERRY TREE IS 139.5 FEET FROM STATION, 110 DEG 31 MIN TO LEFT OF LINE TO LIGHTHOUSE. IN 1910 CENTER BOLT FOUND IN GOOD CONDITION, LIKEWISE THE LARGE FLAGPOLE MENTIONED IN 1904. THREE IRON STRAPS LEADED INTO THE ROCK AND TO WHICH THE LEGS OR BRACES OF SOME FORMER SIGNAL WERE SECURED WERE STILL IN PLACE AND IN GOOD CONDITION.
01/01/1933 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1933 (GCM) THIS STATION IS IN EAST ROCK PARK, PART OF THE PARK SYSTEM OF THE CITY OF NEW HAVEN. REFERENCE MARK NO.1 AND REFERENCE MARK NO.2 ARE STANDARD BRONZE DISKS SET IN OUTCROPPING BEDROCK AS DESCRIBED IN NOTES 12A. TO APPROACH FROM NEW HAVEN. FOLLOW ORANGE STREET TO ITS END. TURN RIGHT ON PARK DRIVE, GO 0.4 MILE TO FOOT OF DRIVE LEADING TO SUMMIT. TURN LEFT AND GO 1.7 MILES TO THE LOCATION OF THE STATION. THE DRIVE IS AT THE EDGE OF THE VERTICAL CLIFF AT THIS POINT. THE STATION IS NOT ON THE HIGHEST PART OF THE ROCK, BUT IS APPROXIMATELY 0.2 MILE NW OF SOLDIERS AND SAILORS MONUMENT, WHICH OCCUPIES THE SUMMIT. THE STATION IS ALMOST DIRECTLY IN LINE WITH THE AXIS OF ORANGE STREET. THE DRIVE IS GUARDED WITH A LOW MASONRY WALL WITH PIPE RAILING SUPPORTED BY CAST-IRON STANCHIONS. THE MIDDLE OF THIS RAIL BEARS S 68 DEG W (MAGNETIC) AND IS 13.1 METERS DISTANT. A 20-FOOT HIGH STEEL STANDPIPE FOR PARK WATER SUPPLY BEARS S 85 DEG E (MAGNETIC) DISTANT 32.6 METERS. THE STUMP OF THE OLD 16-INCH FLAGPOLE BEARS S 10 DEG E (MAGNETIC) AND IS 6.15 METERS DISTANT. THE STATION IS MARKED BY AN IRON BOLT, SET IN SULPHUR, FLUSH WITH THE SURFACE OF AN OUTCROPPING LEDGE. SEVERAL ANCHOR BOLTS ARE ALSO SECURED IN THE ROCK IN THE VICINITY, BUT THEY PROJECT ABOVE THE ROCK AND HAVE HOLES FOR FASTENING GUYS. REFERENCE MARK NO.1 IS SAME LEDGE AS STATION AND IS DESIGNED TO DISTINGUISH THE CENTER BOLT FROM THE OTHERS. IT BEARS S 73 DEG W (MAGNETIC) AND IS 0.75 METER DISTANT. REFERENCE MARK NO.2 IS IN A SEPARATE OUTCROPPING AND BEARS S 41 DEG E (MAGNETIC) DISTANT 10.28 METERS. IT BEARS N 37 DEG E (MAGNETIC) FROM THE MASONRY POST AT E END OF GUARD RAIL AND IS 14 METERS DISTANT. CENTER IS THE ORIGINAL 1871 MARK. REFERENCE MARKS WERE ESTABLISHED IN 1933.
01/01/1967 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1967 (CHO) STATION AND R.M.S RECOVERED IN VERY GOOD CONDITION. R.M.S ARE PINPRICKED. NOT STAMPED. BECAUSE AUTOMOBILE ROAD TO THE SUMMIT FROM THE SOUTH HAS BEEN CLOSED FOR SEVERAL YEARS, DELETE THE FIRST THREE LINES OF PARAGRAPH 3, GCM 33. SUBSTITUTE--TO APPROACH FROM NEW HAVEN--FOLLOW WHITNEY AVE. NORTH TO DAVIS ST., TURN RIGHT (E) AND GO 0.6 MILE TO EAST ROCK PARK ENTRANCE, WELL MARKED. HERE, TURN RIGHT (S) AND GO 0.1 MILE WHERE YOU BEAR LEFT (SE) BECAUSE SUMMIT ROAD LEADS SLY ALONG E SIDE OF RIDGE, GRADUALLY CROSSING RIDGE, AND THEN LEADS S ALONG W SIDE OF RIDGE TO STATION. DISTANCE FROM DAVIS STREET PARK ENTRANCE TO STATION IS 1.4 MILES. GCMS PARAGRAPHS 4 THROUGH 8 ARE GOOD--CHO CHECKED ALL DETAILS. CHO FOUND ONLY TWO OF SEVERAL ANCHOR BOLTS, ONE IS 3-1/2 FT. EXS OF STATION. THE OTHER IS 4 FT. E OF R.M. 2. STUMP OF OLD 16 IN FLAGPOLE, FLUSH WITH GROUND, AND WEATHER-WORN, IS STILL USEFUL FOR ITS BEARING AND DISTANCE FROM STATION. THE 20 FT. STEEL STANDPIPE IS PARTLY HIDDEN BY TREES, BUT A PROMINENT NEW OBJECT IS NOW HELPFUL IN FINDING THE STATION. FIFTEEN FEET, S 10 DEG E (MAG.) FROM 20 FT STANDPIPE IS A 75 FT TELEPHONE RELAY MAST (3 BRACED-LEGS OF ANGLE STEEL, 2 FEET APART), VISIBLE FROM NEARLY ALL POINTS ON THE SUMMIT. STANDPIPE AND TALL RELAY MAST ARE ENCLOSED BY A 15 FT HIGH, RECTANGULAR, STEEL-WIRE FENCE, HAVING A PADLOCKED GATE.
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 AS DESCRIBED IN 1933. THE DISTANCE TO BOTH REFERENCE MARKS CHECKED THE 1933 DISTANCE. THE DIRECTION TO REFERENCE MARK 2 WAS FOUND TO BE GREATER BY 02 MINUTES AND 58 SECONDS. REFERENCE MARK 1 IS SET BESIDE THE STATION TO POINT IT OUT FROM OTHER BOLTS THAT ARE SET IN THE SAME OUTCROPPING LEDGE. A COMPLETE NEW DESCRIPTION FOLLOWS. THE STATION IS ABOUT 1 MILE NORTH OF NEW HAVEN, 1 MILE WEST OF THE JUNCTION OF INTERSTATE HIGHWAY 91 AND STATE HIGHWAYS 17 AND 80, WHICH IS IN THE NORTHEAST EDGE OF NEW HAVEN, IN EAST ROCK PARK, 0.1 MILE NORTHWEST OF THE SOLDIERS AND SAILORS MONUMENT AND ON PROPERTY OWNED BY THE CITY OF NEW HAVEN. TO REACH THE STATION FROM THE JUNCTION OF INTERSTATE HIGHWAY 91 AND STATE HIGHWAYS 17 AND 80, IN THE NORTHEAST EDGE OF NEW HAVEN, GO WEST ON STATE HIGHWAYS 17 AND 80 FOR 0.95 MILE TO THE JUNCTION OF U.S. HIGHWAY 5, JUST AFTER CROSSING OVER A BRIDGE. TURN RIGHT AND GO NORTH ON U.S. HIGHWAY 5 FOR 1.15 MILES TO THE JUNCTION OF RIDGE ROAD. TURN LEFT AND GO NORTHWEST ON RIDGE ROAD FOR 0.35 MILE TO THE JUNCTION OF DAVIS STREET. TURN LEFT AND GO WEST ON DAVIS STREET FOR 0.1 MILE TO THE ENTRANCE TO EAST ROCK PARK ON THE LEFT. TURN LEFT INTO THE PARK AND GO SOUTHWEST ON A PAVED ROAD FOR 0.05 MILE TO A PAVED ROAD LEFT. TURN LEFT AND GO SOUTHERLY ON THE PAVED ROAD, UPGRADE, FOR 1.1 MILES TO THE TOP OF THE HILL, A SMALL GREEN BUILDING AND RADIO TOWER WHICH IS ENCLOSED IN A WIRE FENCE AND THE STATION ON THE LEFT AS DESCRIBED. THE STATION MARK IS AN IRON BOLT SET IN SULPHUR IN A DRILL HOLE IN AN OUTCROPPING LEDGE AND IS FLUSH WITH THE LEDGE SURFACE. IT IS 97 FEET WEST OF THE NORTHWEST CORNER OF THE FENCE AROUND THE SMALL BUILDING AND RADIO TOWER, 74 FEET SOUTH OF THE NORTH END OF A GUARD RAIL, 67 FEET NORTH OF THE SOUTH END OF THE SAME GUARD RAIL, 32 FEET EAST OF THE CENTER OF A PAVED ROAD, 2.47 FEET EAST OF REFERENCE MARK 1 AND 1.8 FEET NORTHWEST OF AN IRON BOLT WHICH IS LEADED IN A DRILL HOLE IN THE SAME LEDGE. REFERENCE MARK 1, STAMPED---NO 1 1933---, IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN A ROCK OUTCROP WHICH IS FLUSH WITH THE GROUND SURFACE. IT IS 99 FEET WEST OF THE NORTHWEST CORNER OF THE FENCE, 73 FEET SOUTH OF THE NORTH END OF THE GUARD RAIL, 67 FEET NORTH OF THE SOUTH END OF THE GUARD RAIL AND 34 FEET EAST OF THE CENTER OF THE PAVED ROAD. REFERENCE MARK 2, STAMPED---NO 2 1933---, IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN A ROCK OUTCROP WHICH IS FLUSH WITH THE GROUND SURFACE. IT IS 105 FEET SOUTHEAST OF THE NORTH END OF THE GUARD RAIL, 78 FEET WEST OF THE NORTHWEST CORNER OF THE FENCE, 45 FEET NORTHEAST OF THE SOUTH END OF THE GUARD RAIL AND 34 FEET EAST OF THE CENTER OF THE PAVED ROAD. NO AZIMUTH MARK WAS SET AT THIS TIME. HEIGHT OF LIGHT SHOWN ABOVE THE MARK WAS 18.8 METERS. DESCRIBED BY E.L. WORD.
01/01/1982 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982 (VDN) THE STATION MARK, REFERENCE MARKS 1 AND 2 WERE RECOVERED IN GOOD CONDITION. THE MEASUREMENT TO REFERENCE MARK 1 WAS 0.011 METER SHORT, REFERENCE MARK 2 WAS 0.013 METER SHORT, COMPARED TO THE 1976 DATA. THE DIRECTION TO REFERENCE MARK 2 COMPARED, REFERENCE MARK 1 WAS TOO CLOSE TO FOCUS ON. A NEW DESCRIPTION FOLLOWS. THE STATION IS LOCATED ABOUT 1.6 KM (1.0 MI) NORTHEAST OF THE APPROXIMATE CENTER OF NEW HAVEN, 1.6 KM (1.0 MI) WEST-NORTHWEST OF THE JUNCTIONS OF INTERSTATE HIGHWAY 91 AND STATE HIGHWAYS 17 AND 80, 0.2 KM (0.1 MI) NORTHWEST OF THE SOLDIERS AND SAILORS MONUMENT AND IN THE EAST ROCK PARK. OWNERSHIP-- CITY OF NEW HAVEN, NEW HAVEN CITY HALL, 195 CHURCH STREET, NEW HAVEN CT 06510, PHONE NUMBER 203- 787-6471. TO REACH THE STATION FROM STATE OF CONNECTICUT DEPARTMENT OF MOTOR VEHICLES, JUST NORTH FROM THE JUNCTIONS OF STATE STREET AND RIDGE ROAD, WHICH IS LOCATED IN THE NORTHEAST PART OF NEW HAVEN, GO SOUTH ON STATE STREET FOR ABOUT 30.5 METERS (100 FT) TO RIDGE ROAD ON RIGHT. TURN RIGHT AND GO NORTHERLY ON RIDGE ROAD FOR 0.6 KM (0.4 MI) TO A TRAFFIC LIGHT AND CROSSROAD. TURN LEFT AND GO WEST ON THE UNMARKED ROAD FOR 0.2 KM (0.1 MI) TO A PAVED ROAD LEFT THAT LEADS TO THE PARK. TURN LEFT AND GO FOR 0.1 KM (0.05 MI) TO A FORK. KEEP LEFT GOING SOUTHEAST FOR 0.6 KM (0.4 MI) TO A SIDE ROAD LEFT. CONTINUE AHEAD ON THE WINDING ROAD FOR 0.8 KM (0.5 MI) TO A SIDE ROAD LEFT. CONTINUE AHEAD SOUTHERLY ON THE WINDING ROAD FOR 0.3 KM (0.2 MI) TO A REVERSE FORK. KEEP RIGHT SOUTHERLY, THEN EASTERLY ON THE WINDING ROAD FOR 0.2 KM (0.1 MI) TO THE STATION ON LEFT. THE STATION IS AN IRON BOLT SET IN SULPHUR IN A DRILL HOLE IN AN OUTCROPPING LEDGE, FLUSH WITH LEDGE SURFACE. IT IS LOCATED 13.11 METERS (43.0 FT) EAST FROM A GUARD RAIL ON A ROCK WALL, 10.21 METERS (33.5 FT) SOUTH FROM A DOUBLE TRUNKED COTTONWOOD TREE, 9.75 METERS (32.0 FT) EAST FROM THE APPROXIMATE CENTER OF PAVED ROAD AND 2.13 METERS (7.0 FT) EAST-NORTHEAST FROM A WITNESS POST. REFERENCE MARK NUMBER 1 IS A STANDARD NGS DISK STAMPED---NO. 1 1933---, SET INTO A ROCK OUTCROP. IT IS LOCATED 12.37 METERS (40.6 FT) EAST FROM A GUARD RAIL ON A ROCK WALL, 10.21 METERS (33.5 FT) SOUTH FROM A DOUBLE TRUNKED COTTONWOOD TREE AND 1.49 METERS (4.9 FT) EAST-NORTHEAST FROM A WITNESS POST. MARK IS LEVEL WITH STATION. REFERENCE MARK NUMBER 2 IS A STANDARD NGS DISK STAMPED---NO 2 1933---, SET INTO A ROCK OUTCROP. IT IS LOCATED 19.35 METERS (63.5 FT) SOUTH-SOUTHEAST FROM A DOUBLE TRUNKED COTTONWOOD TREE, 13.59 METERS (44.6 FT) EAST FROM A GUARD RAIL ON A ROCK WALL AND 11.28 METERS (37.0 FT) SOUTHEAST FROM A WITNESS POST. MARK IS LEVEL WITH STATION. HEIGHT OF LIGHT SHOWN ABOVE THE MARK WAS 18.9 METERS. DESCRIBED BY J.N. LEONHARDT, CHECKED BY D.R. VARNEY.
01/01/1984 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1984 (RHM) STATION RECOVERED EXCELLENT - STATION AND REF. MARK NO. 1 WERE COVERED WITH 6 INCHES OF DIRT. REF. MARK NO. 2 WAS FOUND TO BE IN EXCELLENT CONDITION ALSO, TELEPHONE RELAY MAST IS NOW A 4 LEGGED STRUCTURE AND THE FENCE IS ONLY 8 FEET HIGH.

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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