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Details for Benchmark: KV3845

N 40° 52.410 W 075° 41.976 (NAD 83)

Altitude: 1682

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

Location:
In CARBON county, PA View Original Datasheet
Designation:
THORPE
Marker Type:
traverse station disk
Setting:
in a boulder
Stability:

Reference Points

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I, too, found what Rich & Zhanna did several years back. What I didn't find was one of the disks, but I did find the one tinted green (not the rust colored one). Alas, I cannot find the azimuth off rte 903 due to lack of parking, but maybe I can eyeball it someday!

N 40° 52.411 W 075° 41.975

On a whim, before mountain biking at nearby State Gamelands as we'd planned, Rich and I decided to attempt to locate the THORPE station and reference marks. It was a simple matter to follow Route 903 to Maury Road and then to park at the bottom of Fire Tower Road. This road is blocked to cars by a locked gate, so it was fortunate that we had our bikes with us for the 1-3/4 mile climb to the tower. Once at the coordinates, though, we were disappointed to discover that the station disk is missing, having been pried off. Nothing but the stem, embedded in the boulder, remains. Both reference marks were located easily, and they are both in fair condition. Before leaving Bear Mountain, we photographed the fire tower as well as a Carbon County GPS survey station mark that Rich located on another of the enormous boulders, not far from station THORPE. The azimuth mark, located along Route 903, was found later in the afternoon. The disk was easy to spot; finding a safe place to park was more difficult than locating the mark. This disk is in excellent condition. Interestingly, the fire tower can be viewed from the azimuth mark.

[i]An official report on the condition of this mark has been submitted to NGS. That agency subsequently declared the mark officially Destroyed.[/i]

Zhanna

[Photos:]
photoKV3845, Carbon County, PA
photoFacing NE, with the fire tower shown in the background.

photoKV3845 RM1
photoFacing NNE; Rich at station.

photoKV3845 RM2
photoFacing ESE; Rich at station.

photoKV3845 AZ MK
photoFacing NW, along the powerline cut.
photoFacing SSE, with the fire tower indicated.

N 40° 52.411 W 075° 41.978

This second order horizontal traverse station is located at the summit of Bear Mountain. The 1969 historical description leads reliably and easily to the station and all reference marks. The paved road off Route 903 is called Maury Road, and the sign for the Mauch Chunk Forest Fire Tower still exists at the base of Fire Tower Road. There is a locked gate at the start of the dirt road so it is necessary to hike or bike roughly 1¾ miles up to the station. The station mark was found mutilated—the disk portion with the stamped designation has been pried off, and only the stem remains embedded in the drill hole. At the station a Garmin GPSmap76 receiver with active remote antenna indicated 11 feet from the adjusted coordinates on the NGS datasheet. The disk for RM1 is in good condition, and the disk for RM2 is in fair condition. Both are well exposed and the stamped designations are still legible upon close examination. The azimuth mark is well exposed, in excellent condition, and the stamped designation is highly legible. ~Rich in NEPA~

[Note: The criterion for logging this recovery as “Found” is [u]positive identification[/u], and since the reference marks are all intact they provide sufficient evidence of the station's exact location and identity. Also, the station is not being logged as “Destroyed” because it is still viable in spite of the missing marker. Subsequently its condition is described as “Poor” pending final determination by NGS.]

[Photos:]
photoKV3845, “THORPE 1969,” Carbon County, PA.
photoGPSr and the station mark.
photoEye level view of station mark. Station indicated.
photoOrientation view, facing northeast and LOT. Station indicated.

photoKV3845, “THORPE No. 1 1969.”
photoGPSr and the reference mark.
photoOrientation view. Reference mark indicated. Zhanna at station mark.

photoKV3845, “THORPE No. 2 1969.”
photoGPSr and the reference mark.
photoOrientation view. Reference mark indicated. Zhanna at station mark.

photoKV3845, "THORPE 1969."
photoGPSr and the azimuth mark.
photoEye level view of azimuth mark, facing southeast.
photoOrientation view, facing south-southeast. LOT indicated.
photoOrientation view, facing northwest. Azimuth mark indicated.

Documented History (by the NGS)

1/1/1969 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1969 (WMJ) THE STATION IS LOCATED ABOUT 3 MILES NORTH OF LEHIGHTON, 2 MILES EAST OF JIM THORPE, AT THE SITE OF THE MAUCH CHUNK FOREST FIRE LOOKOUT TOWER AND ON THE HIGHEST POINT OF WHAT IS LOCALLY KNOWN AS BEAR MOUNTAIN. TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAY 209 AND STATE HIGHWAY 903 IN JIM THORPE GO NORTHEAST ON STATE HIGHWAY 903 FOR 1.6 MILES TO JIM THORPES GRAVE AND MONUMENT ON THE LEFT, CONTINUE NORTHEAST FOR 0.8 MILE TO A POWER LINE CROSSING THE HIGHWAY AND THE AZIMUTH MARK ON THE LEFT. CONTINUE NORTHEAST ON STATE HIGHWAY 903 FOR 1.55 MILES TO A SIDE ROAD ON THE RIGHT, TURN RIGHT AND GO SOUTH FOR 0.85 MILE ON A PAVED ROAD TO A GRAVELED ROAD ON THE RIGHT AND A SIGN, MAUCH CHUNK FOREST FIRE TOWER, TURN RIGHT AND GO WEST ON THE GRAVELED ROAD FOR 1.65 MILES TO THE FOREST FIRE TOWER AND THE STATION JUST SOUTH OF THE TOWER ON A HIGH BOULDER. THE STATION MARK IS A STANDARD TRAVERSE DISK CEMENTED IN A DRILL HOLE IN A 8 BY 6 FOOT BOULDER THAT PROJECTS 6 FEET AND THE DISK IS STAMPED THORPE 1969. IT IS 77.9 FEET SOUTHWEST OF CENTER OF THE FOREST FIRE TOWER. REFERENCE MARK NO. 1 IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN A 10 BY 5 FOOT BOULDER PROJECTING 5 FEET AND THE DISK IS STAMPED THORPE NO 1 1969. REFERENCE MARK NO. 2 IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN A 12 BY 4 FOOT BOULDER PROJECTING 2 FEET AND THE DISK IS STAMPED THORPE NO 2 1969. THE AZIMUTH MARK IS 29 FEET NORTH OF THE APPROXIMATE CENTER OF THE PAVED ROAD, 29 FEET NORTHEAST OF A CONCRETE CULVERT AND 4.3 FEET NORTHWEST OF A METAL WITNESS POST. IT IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN A 7 BY 7 FOOT BOULDER WHICH IS ABOUT 8 FEET HIGHER THAN THE ROAD AND THE DISK IS STAMPED THORPE 1969. HEIGHT OF LIGHT ABOVE STATION MARK 1.5 METERS.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in September 1999.
  • 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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