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Details for Benchmark: MY3577

N 42° 03.106 W 071° 12.385 (NAD 83)

Altitude: 229

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

Location:
In NORFOLK county, MA View Original Datasheet
Designation:
MASSACHUSETTS NORTH BASE
Marker Type:
bolt
Setting:
in rock outcrop
Stability:

Reference Points

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This recovery was a joint effort of Dave (ddnutzy) and myself. See also ddnutzy's log for this station which has additional photos.

We spent a good part of the Patriot's Day weekend in Massachusetts searching for old triangulation stations. We were particularly looking for those used in the early triangulation which took place from the 1830s to the 1860s and which became part of the Eastern Oblique Arc.

This was one of the primary stations and the original 1844 copper bolt set in is still intact.

The station and both reference marks (11MB and RM2) were recovered.

The station is located in Foxboro Mass, behind a residence on Summer Street. We were given permission to search for the mark. The women said we were not the first to search for the "old tower" (which we knew had been demolished about 100 years ago).

We first found Reference "11MB" (near the RR tracks) - with the help of my GPS and metal detector - and measured off the distance to the station, but could not find it after much digging (we found many pieces of brick from the old tower). Then we "guessed" RM2 (which was not described in the datasheet but appears in the box score) was a 1/4 inch hole we found in a boulder to the north of the station. Taking a measurement from this drill hole led us to the station, which was in plain site!

See station MY4858 for maps from the C&GS Special Publication No. 76 "Triangulation in Massachusetts" (1922) which shows all the primary stations, and also a screen shot from a Google Map I constructed of the same stations which also shows the connection to the Eastern Oblique Arc.

Here is a link to the interactive Google Map for this triangulation where each station can be clicked for a detailed map and other information: Interactive Map

Here is a link to the special publication: Special Publication No. 76

And lastly, Here is a link to Holograph's Benchmark Wiki site explaining the Eastern Oblique Arc: E.O.A.

[Photos:]
photoMY3577 Mass North Base, Foxboro MA
The 3/4 inch copper bolt is set in a 6" square granite block which projects above the ground level. There is much debris (old brick) under the dirt and leaves in the area. The station is about 6' behind an ornamental wooden fence.
photoMY3577 Mass North Base, Foxboro MA
Close up of station.
photoMY3577 Mass North Base Ref 11MB, Foxboro MA
The Reference mark "11MB" was near the drop off to the RR tracks and was several inches under ground. We found it with the help of a GPS and a metal detector.
photoMY3577 Mass North Base Ref 11MB, Foxboro MA
Close up of mark. The letters "MB" are visible but the "11" is not, due to damage to the center of the disk.
photoMY3577 Mass North Base Ref 11MB, Foxboro MA
Close up with cornstarch to enhance the stamping. There appears to be an elevation "220. ..." which is unexpected, since this was set as a traverse station, a horizontal control mark.
photoMY3577 Mass North Base RM2, Foxboro MA
RM2, a 1/2 inch drill hole in a boulder. There was no mention of this in any of the logs on the datasheet but it was in the correct place and in fact allowed us to find the station.
photoMY3577 Mass North Base RM2, Foxboro MA
Close up of RM2.
photoMY3577 Mass North Base Documentation, Foxboro MA
A copy of the station description from Special Publication No. 76 "Triangulation in Massachusetts". There were numerous bricks from the old tower under the dirt and leaves near the station.
photoMassachusetts Base Net Diagram 1844
Diagram of the Base Net for the Massachusetts Base Line (1844) from USCG&S Special Publication No. 7 (1903) "The Eastern Oblique Arc".
photoMassachusets Base Line Documentation
Documentation on the Massachusetts Base Line from USCG&S Special Publication No. 7 "The Eastern Oblique Arc"

Documented History (by the NGS)

01/01/1844 by CGS (MONUMENTED)
01/01/1889 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1889 STATION IS ON THE E SIDE OF THE OLD COLONY RAILROAD, BETWEEN MANSFIELD AND EAST FOXBORO, ABOUT 1-1/4 MILES FROM THE FORMER, 3/4 MILE FROM THE LATTER, AND 2-1/4 MILES SE BY E OF FOXBORO. THE STATION IS MARKED WITH A COPPER BOLT SET IN THE ROCK. IN ORDER TO OBSERVE ON OTHER STATIONS OF THE TRIANGULATION, A HEXAGONAL BRICK TOWER WAS BUILT 42 FEET IN HEIGHT, BUT THIS TOWER WAS DESTROYED BY VANDALS IN 1908. THE GROUND MARK MAY STILL EXIST.
01/01/1934 by MAGS (GOOD)
RECOVERY NOTE BY MASSACHUSETTS GEODETIC SURVEY 1934 OLD DESCRIPTION RECOVERED AS DESCRIBED IN GOOD CONDITION. ADD FOLLOWING--435 FEET N OF MILEPOST B 23-P 21 ON MAIN LINE NEW YORK, NEW HAVEN AND HARTFORD RAILROAD BOSTON - PROVIDENCE LINE, 105 FEET E OF E RIGHT-OF-WAY LINE. BRONZE BOLT 5/8 INCH OR 3/4 INCH ROUND HEAD SET IN 6-INCH SQUARE GRANITE POST IN CENTER OF MASONRY FOUNDATION OF OLD HEXAGONAL BRICK TOWER. NO MARKS ON BOLT OR TOP OF POST. POST IS APPARENTLY SOLID BUT IF THIS MONUMENT IS TO BE PRESERVED, LOOSE MASONRY SHOULD BE CLEARED AWAY AND REPLACED WITH CONCRETE.
01/01/1934 by MAGS (GOOD)
RECOVERY NOTE BY MASSACHUSETTS GEODETIC SURVEY 1934 THE STATION WAS FOUND IN EXCELLENT CONDITION AS DESCRIBED WITH THE FOLLOWING CORRECTIONS AND ADDITIONS--THE OLD COLONY RAILROAD IS NOW THE SHORE LINE OF THE NEW YORK, NEW HAVEN AND HARTFORD RAILROAD. THE STATION IS ABOUT 500 FEET N ALONG THE RAILROAD FROM MILEPOST B 23-P 21 AND ABOUT 113 FEET E OF THE E RIGHT-OF-WAY FENCE. A CONCRETE POST WITH A DISK IN THE TOP (U.S.C. AND G.S. AND STATE SURVEY) HAS RECENTLY BEEN SET ABOUT 122.5 FEET W OF THE STATION. THE STATION IS MARKED BY A COPPER BOLT IN THE TOP OF A 6-INCH SQUARE GRANITE POST, EXTENDING ABOUT 2 INCHES ABOVE A CONCRETE FOOTING OR FOUNDATION RECENTLY POURED AROUND IT. A CROSS HAS BEEN FILED IN THE HEAD OF THE BOLT. THE STATION IS IN THE MIDST OF SCATTERED BRICKS AND MORTAR. ALL THAT REMAINS OF THE OLD TOWER.
01/01/1934 by MAGS (GOOD)
RECOVERY NOTE BY MASSACHUSETTS GEODETIC SURVEY 1934 ADD TO ORIGINAL DESCRIPTION--3/4 INCH ROUND HEAD COPPER BOLT IN TOP OF 6-INCH SQUARE GRANITE POST IN CENTER OF MASONRY FOUNDATION OF OLD HEXAGONAL BRICK TOWER, ABOUT 435 FEET N OF MILEPOST B 23-P 21 ON BOSTON-PROVIDENCE LINE OF NEW YORK, NEW HAVEN AND HARTFORD RAILROAD AND ABOUT 115 FEET E OF THE E RIGHT-OF-WAY FENCE, LOCATED ABOUT 1-1/4 MILES N OF MANSFIELD AND 3/4 MILE S OF EAST FOXBORO. AND 1/4 MILE S OF SUMMER STREET CROSSING. A U.S.C. AND G.S. AND STATE SURVEY STANDARD DISK IN A CONCRETE POST (TRAVERSE STATION 11MB LOCAL CONTROL SURVEY) HAS RECENTLY BEEN SET ABOUT 118 FEET W OF THE STATION.
01/01/1935 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (FLP) STATION RECOVERED AS DESCRIBED, WITH THE CORRECTION THAT THE LOCALITY SHOULD BE FOXBORO RATHER THAN MANSFIELD.
01/01/1936 by MAGS (GOOD)
RECOVERY NOTE BY MASSACHUSETTS GEODETIC SURVEY 1936 CROSS MARK ON ROUND HEAD OF 3/4 INCH COPPER BOLT SET IN TOP OF 6-INCH SQUARE GRANITE POST ABOUT 2 INCHES ABOVE CONCRETE POURED AROUND IT FOR PROTECTION IN CENTER OF MASONRY FOUNDATION OF OLD HEXAGONAL BRICK TOWER, LOCATED 193 FEET NW OF THE CENTER OF A NEW STATE HIGHWAY AT A POINT 2300 FEET NE ALONG THE ROAD FROM THE FOXBORO-MANSFIELD TOWN LINE. ALSO 185 FEET SE OF THE E RAIL OF THE NORTH BOUND TRACK OF THE BOSTON-PROVIDENCE LINE OF THE NEW YORK, NEW HAVEN AND HARTFORD RAILROAD, AND 121 FEET FROM THE TOP OF THE CUT, AT A POINT NEAR A WHISTLE POST, ABOUT 1/4 MILE SW OF THE FORMER SUMMER STREET CROSSING AND 435 FEET NE OF MILEPOST B 23-P 21, IN THE SOUTHEASTERN CORNER OF FOXBORO. REFERENCE MARK--U.S.C. AND G.S. AND STATE SURVEY STANDARD DISK STAMPED 11MB SET IN A CONCRETE MONUMENT IN 1934 BY THE MASSACHUSETTS GEODETIC SURVEY FOR USE AS A TRAVERSE STATION, LOCATED 44 FEET UP THE SLOPE FROM THE WHISTLE POST MENTIONED ABOVE. 3.5 FEET INSIDE THE E RIGHT-OF-WAY FENCE AND 122.51 FEET, IN AZIMUTH 95 DEG 59 MIN 16 SEC FROM THE STATION. WITNESS MARKS--THREE OAK TREES, LOCATED FROM THE STATION AS FOLLOWS--AN 8-INCH OAK 28.9 FEET SE, A 6-INCH OAK 15.7 FEET N AND A 12-INCH OAK 34.4 FEET S.
01/01/1936 by MAGS (GOOD)
RECOVERY NOTE BY MASSACHUSETTS GEODETIC SURVEY 1936 IN 1936-7 THE MASSACHUSETTS GEODETIC SURVEY USED A 77-FOOT TOWER, WHICH AFFORDED A CLEAR VIEW IN ALL DIRECTIONS. PERMISSION TO USE THE STATION SHOULD BE OBTAINED FROM THE MANAGER OF THE MANSFIELD BLEACHERY.
01/01/1967 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1967 (NCS) LOCATED BETWEEN SUMMER STREET AND THE NEW YORK, NEW HAVEN AND HARTFORD RAILROAD TRACKS, IN THE TOWN OF FOXBOROUGH, 193 FEET NORTHWEST OF THE CENTER OF SUMMER STREET, 185 FEET SOUTHEAST OF THE RAILROAD TRACKS AND 121 FEET SOUTHEAST OF THE EDGE OF A HIGH RAILROAD CUT, IN DENSE WOODS. STATION MARK IS A ROUNDED COPPER BOLT WITH A CROSS CUT IN THE TOP, SET IN THE TOP OF A 6-INCH GRANITE MONUMENT THAT PROJECTS 2 INCHES ABOVE CONCRETE REINFORCEMENT BUT IS LOWER THAN THE SURROUNDING BRICK RUBBLE. A SEMI-CIRCLE OF LARGE ROCKS MARKS THE FORMER BASE OF THE BRICK TOWER ON THE SOUTH AND WEST SIDES. MARK IS 17.8 FEET MAGNETIC NORTH OF A 1 1/2-INCH DRILL HOLE 8 INCHES DEEP IN A TRIANGULAR BOULDER WITH 3-FOOT SIDES THAT PROJECTS 3-10 INCHES. MASS. TRAVERSE STATION 11MB WAS NOT FOUND AFTER CONSIDERABLE SEARCH, BUT MAY BE BURIED IN THICK SCRUB OAK. TO REACH FROM STATE HIGHWAY 106 IN MANSFIELD, GO NORTH ON MAIN, OAKLAND AND SUMMER STREET (NAME OF STREET CHANGES AT EDGE OF THICKLY POPULATED AREA AND AGAIN AT THE TOWN LINE) FOR 1.55 MILES TO STATION ON THE LEFT. THERE IS AN ABANDONED GRAVEL PIT 0.05 MILE BEYOND. FROM THE SOUTHWEST GRAVEL BANK, STATION IS 250 FEET SOUTHWEST. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN 1.4 MILES NORTH OF MANSFIELD.

Control Text

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