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Details for Benchmark: MY3453

N 42° 28.362 W 071° 13.161 (NAD 83)

Altitude: 269

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

Location:
In MIDDLESEX county, MA View Original Datasheet
Designation:
JENENN MAGS 1891
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Must Read!

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During yesterday's visit, all three "tack in lead" RMs were found as described, except that RM1, reported as 22.6 ft. from the station was measured at 22.9 ft.

This recovery was made possible by Curt Crow, the Massachusetts NGS coordinator from MassHighway (which now performs the functions of the former MAGS), who supplied me with the 1935 MAGS data cards, documenting the bearings and distances of the RMs, as follows:

RM1 distant 22.6 ft., bearing 187dT 17' 16" (but see above)
RM2 distant 20.8 ft., bearing 277dT 11' 28"
RM3 distant 8.2 ft., bearing 329dT 38' 23".

The carded bearings, given from the South under NAD 27, were 180d less than those reported above.

The azimuth mark for this station is HAYES HILL, 1891, which bears 182dT 21' 47.7" from the station.

Even with this precise information, the recovery was difficult, due to the depth of thatch and accumulated soil on top of the ledge (see photos) and the fact that the leaded drill holes had discolored quite a bit, after being covered for the past 74 years.

Given that the station is now surrounded by trees exceeding 70 ft. in height, it is unlikely that it will be useful in future. Its recovery, however, is now complete.

[Photos:]
photoStation,-RM1-and-RM3
photoStation,-RM2-and-RM3
photoMY3453-RM1-Detail
photoMY3453-RM2-Detail
photoMY3453-RM3-Detail
photoMY3453-RM3-and-Thatch

The station, monumented in 1891 when Benjamin Harrison was President, and last reported in 1935, was found today in good condition.

The station is now the property of Mr. Gerald F. Zecher, at #22 North Street, Lexington, MA and sits near the top of an extensive ledge outcrop above the northerly side of his house. It was searched for with his kind permission. The station lies about 5 ft. (NW) from the apparent highest point of the ledge outcrop.

The ledge was found heavily covered with thickly matted roots, moss, and decomposed pine needles. Given the difficulty of clearing the ledge, the three RMs in lead were not searched for. The Mass. Highway Dept. has been asked to check on the existence of additional data for these marks, since their distance and direction appears to have beem omitted from the Description.

In the meantime, three new references were established (see photos). (1) The westerly corner of the house's chimney bears about 192 dT from the station, distant about 45 ft. (2) A 12-inch oak tree bears about 12 dT from the station, distant about 22 ft. (3) The bark of the center of the westerly trunk of a four-trunked pine tree bears about 260 dT from the station, distant about 15 ft. All distances were measured with a hand-held laser measuring tool and bearings were taken with a hand-held baseplate compass.

A small cairn (see photo) was left over the station mark, since the property owner asked that it not be blazed.

[This entry was edited by pgrig on Monday, May 18, 2009 at 5:57:27 AM.]

[Photos:]
photoMY3453-Detail
photoMY3453-Chimney-Reference
photoMY3453-Pine-Tree-Reference
photoMY3453-Oak-Tree-Reference
photoMY3453-Cairn-Remaining

The site was visited today, without success. The mark may well be there, however, and the hunt will continue.

The apparent "highest point" of ledge was found, but was heavily covered with pine detritus and tufts of turf. I will try to get the homeowner's permission to clear off the ledge and expose the mark, which apparently dates from 1891. If it's been hanging out for 117 years, it can age a few weeks more...

Documented History (by the NGS)

Unknown by (MONUMENTED)
01/01/1935 by MAGS (SEE DESCRIPTION)
DESCRIBED BY MASSACHUSETTS GEODETIC SURVEY 1935 STATION IS A 5/8-INCH DRILL HOLE WITHIN TRIANGLE CHISELED IN LEDGE OUTCROP, ABOUT 6 INCHES BELOW THE HIGHEST POINT ON THE LAND OF JOHN GRAHAM IN THE SOUTHWESTERN EDGE OF BURLINGTON. STATION IS 115 FEET NE OF BURLINGTON-LEXINGTON TOWN LINE AND 185 FEET NE OF CENTER OF NORTH STREET, LEXINGTON, AT A POINT 1000 FEET SE ALONG NORTH STREET FROM THE JUNCTION OF BURLINGTON STREET. REFERENCE MARKS ARE THREE COPPER TACKS LEADED IN DRILL HOLES IN LEDGE WERE ESTABLISHED BY THE MASSACHUSETTS GEODETIC SURVEY IN 1935, LOCATED AS FOLLOWS-- STATION MAY BE REACHED FROM LEXINGTON COMMON BY FOLLOWING HANCOCK AND ADAMS STREETS NORTHEASTERLY FOR ABOUT 1.5 MILES TO NORTH STREET, THEN NORTH STREET NW ABOUT 0.5 MILE TO STATION, WHICH IS UP A STEEP BANK TO THE RIGHT.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in June 1998.
  • The orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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