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Details for Benchmark: KW2850

N 40° 00.711 W 077° 23.356 (NAD 83)

Altitude: 2008

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

Location:
In CUMBERLAND county, PA View Original Datasheet
Designation:
BIG FLAT
Marker Type:
triangulation station disk
Setting:
set into the top of a round concrete monument
Stability:

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Found BM and ref. disks in excellent condition, although the witness post won't last much longer.

Recovered in good condition along w/ RM1 & RM2 - quickly swept suspected location of azimuth mark w/ cheap metal detector, but was getting dark - will have to return...

[Photos:]
photoBIG FLAT (KW2850) disk - Cumberland County, PA
photoBIG FLAT (KW2850) area - looking SE
photoBIG FLAT (KW2850) RM1 - Cumberland County, PA
photoBIG FLAT (KW2850) RM2 - Cumberland County, PA

[b]The station mark and both reference marks were easily recovered as described[/b]. We were [b]not able to find the azimuth mark[/b], though we did search for it. Perhaps another trip will do the trick

Greetings Geocachers/Benchmarkers,

I found this benchmark with little difficulty. It’s as described by Daclaren, exactly where it’s supposed to be. gnbrotz and I were able recover RM 1 and RM 2, but were unable to recover the associated azimuth mark to the SW.

Happy Benchmarking,
Ghosthunter
Gettysburg, PA

Found the station mark and both reference marks
without difficulty.

Recovered the triangulation station and reference marks in good condition. The reference marks, set in concrete, are in the grass bordering Ridge Road and are visible from the road. The triangulation station is also set in concrete but is located in some dense brush. It was barely visible from the grass at the side of the road (looking into the brush) and took a bit of bushwhacking to access. The witness post for the station is still there, but the paint has worn off and the post is now brown (see photos). We didn't recover the azimuth mark but will try to find it at a later time.

(This was our 50th benchmark find.)

[Photos:]
photoKW2850 triangulation station disk
photoKW2850 station disk set in concrete
photoKW2850 station disk and witness post
Triangulation station disk in foreground and witness post a few feet away (top center of photo).
photoKW2850 reference mark #1
photoKW2850 ref. mark #1 set in concrete
photoKW2850 ref. mark #1 distance shot
Reference mark #1 (just below and to the left of center) and surrounding area.
photoKW2850 Reference mark #2
photoKW2850 ref. mark #2 set in concrete
photoKW2850 ref. mark #2 and surrounding area

Documented History (by the NGS)

1/1/1942 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1942 (PLB) STATION IS ABOUT 9 MILES N OF CASHTOWN AND 8 MILES W OF BENDERSVILLE AND ABOUT 1.25 MILES NE OF BIG FLAT LOOKOUT TOWER, ON THE TOP OF WHAT IS KNOWN AS BIG FLAT RIDGE ON THE TOP OF SOUTH MOUNTAIN. IT IS 35 FEET SE OF THE CENTER OF RIDGE ROAD, AND 0.05 MILE S OF A SIGN, LEWIS TRAIL. THE DISK IS STAMPED BIG FLAT 1942 AND PROJECTS 4 INCHES. SURFACE, UNDERGROUND, AND REFERENCE MARKS ARE STANDARD DISKS SET IN CONCRETE. REFERENCE MARK NO. 1 IS SW OF THE STATION AND 16 FEET W OF THE CENTER OF RIDGE ROAD. THE DISK IS STAMPED BIG FLAT NO. 1 1942 AND PROJECTS 4 INCHES. REFERENCE MARK NO. 2 IS N OF THE STATION AND 10 FEET W OF THE CENTER OF RIDGE ROAD. THE DISK IS STAMPED BIG FLAT NO. 2, 1942 AND PROJECTS 4 INCHES. THE AZIMUTH MARK IS ABOUT 1.2 MILES SSW OF THE STATION, 0.1 MILE N OF BIG FLAT LOOKOUT TOWER, AND 20 FEET W OF THE CENTER OF RIDGE ROAD. IT IS A STANDARD DISK SET IN A DRILL HOLE IN OUT-CROPPING BEDROCK FLUSH WITH THE GROUND AND STAMPED BIG FLAT 1942. TO REACH FROM THE BIG FLAT LOOKOUT TOWER, GO N ON RIDGE ROAD FOR 0.1 MILE TO THE MARK ON THE LEFT. TO REACH THE STATION FROM CASHTOWN (A SMALL TOWN W OF GETTYSBURG ON U.S. HIGHWAY 30) GO W ON U.S. HIGHWAY 30 FOR 7.0 MILES TO THE JUNCTION OF STATE HIGHWAY 233 (CROSSROADS), TURN RIGHT AND GO N ON HIGHWAY 233 FOR 7.0 MILES TO CROSSROADS, THENCE LEFT AND FOLLOW DIRT ROAD W ACROSS VALLEY AND UP MOUNTAIN FOR 2.4 MILES TO THE JUNCTION OF THE RIDGE ROAD, TURN RIGHT ON RIDGE ROAD AND GO N FOR 0.25 MILE TO BIG FLAT LOOKOUT TOWER, CONTINUE STRAIGHT AHEAD ON RIDGE ROAD FOR 0.9 MILE TO A SIDE ROAD RIGHT, CONTINUE STRAIGHT AHEAD ON RIDGE ROAD FOR 0.4 MILE TO THE STATION ON THE RIGHT. MARK IS WITNESSED BY A 4 BY 4 POST PAINTED WHITE. A 77-FOOT TOWER IS REQUIRED TO CLEAR ALL LINES.
1/1/1952 by AMS (GOOD)
RECOVERY NOTE BY US ARMY MAP SERVICE (NOW DMA) 1952 THE STATION, A STANDARD USC AND GS BRONZE TRIANGULATION DISC, SET IN THE TOP OF A 1 FOOT SQUARE CONCRETE POST, PROJECTING 4 INCHES, WAS RECOVERED IN GOOD CONDITION AS DESCRIBED. BOTH REFERENCE MARKS WERE RECOVERED IN GOOD CONDITION AS DESCRIBED. THE AZIMUTH WAS NOT RECOVERED. AN ANT HILL, 2-1/2 TO A FEET HIGH IS COVERING THE ROCK AND DRILL HOLE. THE STATION IS LOCATED IN DENSE BRUSH, 35 FEET SOUTHEAST OF THE CENTERLINE OF THE ROAD. NO PHOTO-IDENTIFIABLE OBJECTS NEAR.

Control Text

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