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Details for Benchmark: OB0267

N 43° 56.400 W 069° 57.600 (NAD 83)

Altitude: 240.02

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

Location:
In SAGADAHOC county, ME View Original Datasheet
Designation:
ARARAT RM 2
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Easy find.

OK... this was a nice way to start the day today!

ive stood on it a few times

Found it.©

Found it.®

N 43° 56.427 W 069° 57.579

Found by description.

[Photos:]
photoOB0267 Topsham Sagadahoc ME Close Up
photoOB0267 Topsham Sagdahoc ME View East

Of the two remaining disks on this hill I looked for this first. I found it with some trouble. The coordinates were off considerably. Finally found it by first finding OB0625 then using the location info from there. Set my GPS on the disk and let it average. With 100 readings it only got to 17 foot accuracy, but the coordinates it showed for the location were:
N 43 56.426
W069 57.579

[Photos:]
photoDisk with GPS averaging
photoOB0267 disk

Found this with no trouble once I figured out how to get up here (thanks to a geocache called Scott's Sourdough). The benchmark is nicely camo'd due to its patina. The color matches the moss on the rocks exactly!!!

Documented History (by the NGS)

01/01/1933 by CGS (MONUMENTED)
01/01/1975 by MEDT (GOOD)
DESCRIBED BY MAINE DEPARTMENT OF TRANSPORTATION 1975 0.75 MI NE FROM TOPSHAM. ABOUT 0.25 MILE NORTH ALONG STATE HIGHWAY 201 FROM THE POST OFFICE AT TOPSHAM, THENCE 0.2 MILE NORTHEASTERLY ALONG BLACKTOP ROAD (LEADING TO MAINE SCHOOL ADMINISTRATIVE DISTRICT NO. 75 NEW UPPER SCHOOL) TO A TRACK ROAD LEADING SOUTHEASTERLY. THENCE ALONG WINDING TRACK ROAD TO TOP OF HIGH HILL, KNOWN LOCALLY AS MOUNT ARARAT, AND TO THE FIRE LOOKOUT TOWER. A DISK SET FLUSH IN LEDGE 46.5 FEET NORTHWEST OF NORTHWEST CORNER OF THE CONCRETE BUILDING, 60.5 FEET NORTHWEST OF THE NORTHEAST CORNER OF THE CONCRETE BUILDING, 21.5 FEET SOUTHWEST OF SERVICE POLE TO THE CONCRETE BUILDING, 35.5 FEET NORTHWEST OF THE SOUTHWEST ANCHOR BOLT ON THE LOOKOUT TOWER AND 13 FEET SOUTHEAST OF THE 6 FOOT VERTICAL LEDGE FACE. NOTE-- ALSO 62.24 FEET NORTHWEST OF STATION MARK DESCRIBED.
01/01/1991 by USPSQD (POOR)
RECOVERY NOTE BY US POWER SQUADRON 1991 (AMW) MARK RECOVERED IN POOR CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (g = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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