Survey Disk TRI STATE, MY3729 - Thompson, CT - U.S. Benchmarks on Waymarking.com

In Thompson, just southwest of a granite post marking the meeting of the states of Connecticut, Massachusetts, and Rhode Island, is a brass survey marker designated "TRI-STATE."

The marker is located within state-owned woods. The datasheet has the following text about the mark:

"MY3729'DESCRIBED BY CONNECTICUT GEODETIC SURVEY 1937
MY3729'STATION IS ON THE SIDE OF A WOODED ROCKY HILL ABOUT 25 FEET
MY3729'SOUTHWEST OF MONUMENT (GRANITE) MARKING BOUNDARY OF
MY3729'CONN.-R.I.-MASS. STATION MARK IS A STANDARD DISK SET IN A SQUARE
MY3729'CONCRETE POST STAMPED TRI-STATE 1937. UNDERGROUND STATION IS A
MY3729'STANDARD DISK STAMPED TRI-STATE-1937 SET IN 3 INCHES OF CONCRETE,
MY3729'40 INCHES BELOW AND EXACTLY UNDER THE SURFACE STATION MARK. 6
MY3729'INCHES OF DIRT SEPARATE UNDERGROUND MARK FROM THE SURFACE STATION
MY3729'MARK.
MY3729'
. . .
MY3729'REFERENCE MARK NO. 1 IS A STANDARD DISK TRI-STATE-NO. 1-1937 IN
MY3729'GRANITE OUTCROP, 6 INCHES HIGH, NORTH OF STATION. REFERENCE
MY3729'MARK NO. 2 IS A STANDARD DISK TRI-STATE-NO. 2-1937 IN OUTCROP
MY3729'LEVEL WITH GROUND, SOUTH OF STATION.
MY3729'
MY3729'AZIMUTH MARK IS STANDARD DISK TRI-STATE-1937 APPROXIMATELY
MY3729'0.6 MILE WEST OF STATION, 2 FEET NORTH OF RAIL FENCE, 2 FEET EAST
MY3729'OF GATEWAY, AND 100 FEET NORTHEAST OF BRIDGE. IT IS SET IN A
MY3729'CONCRETE POST.
MY3729'
MY3729'SURFACE, REFERENCE, AND AZIMUTH MARKS ARE STANDARD BRONZE DISKS
MY3729'SET IN CONCRETE, AND IN OUTCROPPING BEDROCK, NOTES 1A, 12A, AND 11A."

To get to this mark, from Thompson, go east on E Thompson Road to a place where there is a turnout where there is a sign for the Airline Trail State Park and a kiosk. Park there, cross the street going east and enter the trail, going toward Massachusetts. Continue walking on this graded trail to a place where there is a post marking a path on the right to the Tri-State Marker, .3 miles. Turn right (south) on this trail, passing a granite post marking the boundary of Massachusetts and Connecticut, and follow this marker to the Tri-State granite post. From there, walk approximately 25 feet roughly southwest to the brass marker located about six inches above ground level.

I did not recover the reference disks. One may have been by the granite post - it is presently a drill hole north east of the survey mark and north of the granite post.

The brass disk is in fair condition. There are many pits on the surface. A corner of the concrete block that it is set in has been broken off.

Condition: Mark found in good condition Designation: TRI STATE Benchmark Agency: U.S. Coast & Geodetic Survey Monumentation type: TRIANGULATION STATION Disk County: Windham USGS 7.5' Topographic Quadrangle Name (optional): Thompson, Conn. Special category (optional): Not listed Find type: Searched @ "BM" on a topographic map Web address of this benchmark's datasheet (optional): [Web Link] NGS PID: MY3729 Benchmark Agency (if other): Not listed Monumentation type (if other): Not listed Special Category (if other): Not listed Local database's URL (optional): Not listed

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