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Details for Benchmark: LY2731

N 41° 26.142 W 075° 37.562 (NAD 83)

Altitude: 1042

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

Location:
In LACKAWANNA county, PA View Original Datasheet
Designation:
THROOP
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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Found the station but did not look for the reference marks.

[Photos:]
photo
N 41° 26.142 W 075° 37.562

Finding this set of marks was a two-day adventure for me (three days for Rich, but the first day was planned only as a scouting expedition for him). Early on the morning of the 18th, we met at the start of the jeep trail just off of Olyphant Avenue. I hopped into Rich's car (the more rugged of the two) and we drove in about 1/4 mile, as far as he felt comfortable. We approached the mark on foot through dense woods and brush. The station mark was easy for me to locate because Rich had unearthed it and cleaned it off just days before. The reference marks, however, gave us more of a challenge; the historic descriptions did not match what we found in the area, and we could not reconcile some of the measurements. We attempted to position a stake in the location of the second witness post (in accordance with the 1974 description) and we took our measurements from that point. We took great pains to measure the distances and directions and probe the earth, but for two hours we came up with nothing. Just as we realized the hour was getting late and we needed to leave, Rich's probing paid off and he uncovered RM2 at approximately the distance noted (in 1974) from what remains of the cherry tree.

On the 19th we decided to tackle THROOP once more, and this time we were more optimistic as I'd found some measurements on the official datasheets that I expected would help us locate RM1. We measured out the distances and angles and found the mark almost immediately, though it was buried under several inches of soil thanks to the woodchucks who have made their home adjacent to the post. All three disks are in excellent condition with all stamping legible, and have been cleared of mud and moss. The 1974 description errs in stating that RM1 is 17 feet west of the witness post; the actual direction is nearer southeast.

Zhanna

[Photos:]
photoLY2731, Lackawanna County, PA
photoThe station mark amid some of our equipment.

photoLY2731 RM1
photoRM1 was buried ...

photoLY2731 RM2
photoThe area around RM2 (Rich at RM1) ...

photoZhanna's ready to search!
photoWe set our own unofficial witness post.
photoThe post is labeled with the date and our initials.
N 41° 26.142 W 075° 37.563

To reach this second order horizontal control station it was necessary to access a jeep trail going south off Olyphant Avenue near the I-81 overpass, coordinates: N41° 26.602' W075° 37.614'. It was possible to drive along the trail for about 1/4 mile and continue on foot another 1/4 mile to the edge of a wooded knoll, and then bushwhack through moderately dense brush to the site. The 1974 historical description was reliable enough to locate the area of the station mark, but following the GPSr to the listed coordinates was more helpful. The witness post no longer exists, and the station mark itself was concealed by a layer of dirt, leaf litter and sticks. At the station mark a Garmin GPSmap76 receiver indicated 4.6 feet from the adjusted NGS datasheet coordinates. Locating the two reference marks was a much more difficult task for the following reasons. Both the 1974 and 1959 descriptions are in error and were extremely misleading. The dim track road that was referred to has vanished completely. It seems that over the years a woodchuck or two has taken the liberty of burying RM1 under 3 to 4 inches of tailings from its den-building activities. Also, RM2 was covered by a natural accumulation of dirt, moss, sticks and dead leaves. The area around each of the marks was scraped clear and the settings are now well exposed. All three disks are in very good condition, and the stamped designations are legible. As a final act in the completion of this amateur benchmark recovery a new witness post was placed in accordance with the 1974 description. ~Rich in NEPA~

[last edit: 8/20/2003 2:29:35 PM PST]

[Photos:]
photoLY2731, "THROOP 1959 1974," Lackawanna County, PA.
photoGPSr and the station mark.
photoOrientation view of mark and surroundings. Station indicated.
photoArrival at site equipped for the search. Station indicated.
photoThis is all that remains of the three-trunk wild cherry tree.

photoReference mark "THROOP No. 1 1959"
photoGPSr and the reference mark.
photoOrientation view. Reference mark indicated. Zhanna at station mark.
photoInitially revealing the mark. Woodchucks covered it well.

photoReference mark "THROOP No. 2 1959"
photoGPSr and the reference mark.
photoOrientation view. Reference mark indicated. Zhanna at station mark.

N 41° 26.142 W 075° 37.563

This note is to indicate a “work in progress” since I was able to locate the station mark but not the two associated reference marks. There appears to be a significant discrepancy in the 1974 historical description regarding the placement of the reference disks in relation to a (no longer existing) witness post and the station mark. I intend to return soon with a complete set of NGS datasheets and proceed from the older recoveries in hopes of locating RM1 and RM2. ~Rich in NEPA~

[18-AUG-03] Had to bring in the big guns today. This morning RM2 was uncovered with assistance from Zhanna (Queen of Benchmarks), and the mark seems to correlate with the 1974 description. Armed with some new insights from the NGS datasheets I will return for RM1, and hopefully complete the find and the documentation.

[last edit: 8/18/2003 4:09:42 PM PST]

[Photos:]
photoLY2731, "THROOP 1959 1974," Lackawanna County, PA.
photoGPSr and the station mark.
photoOrientation view of station mark and its surroundings.
photoAdditional view of station mark and its surroundings.

Documented History (by the NGS)

01/01/1959 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1959 (CGS) STATION IS LOCATED AT THE NORTHEAST EDGE OF SCRANTON, AT THE SOUTH EDGE AND ABOUT 70 FEET SOUTHWEST OF A GRASS COVERED HILL, ABOUT 2 MILES NORTHEAST OF THE CENTER SECTION OF SCRANTON, 1 MILE SOUTH OF THE SMALL TOWN OF THROOP, 1/4 MILE NORTH-NORTHWEST OF A CEMETERY AND IS ON PROPERTY OWNED BY THE HUDSON COAL COMPANY. STATION IS REACHED FROM THE JUNCTION OF U.S. HIGHWAYS 611, 11 AND STATE HIGHWAY 307 WHICH IS LOCATED AT THE NORTHEAST EDGE OF SCRANTON. GO NORTH, ON HIGHWAY 611 AND SOUTH BLAKELY STREET FOR 0.2 MILE TO A TRAFFIC LIGHT AND WHERE HIGHWAY TURNS RIGHT, CONTINUE STRAIGHT AHEAD, NORTH, ON NORTH BLAKELY STREET FOR 0.8 MILE TO A CONCRETE BRIDGE WHICH SPANS A NEW HIGHWAY UNDER CONSTRUCTION, CROSS THE BRIDGE AND CONTINUE STRAIGHT AHEAD, ON NORTH BLAKELY STREET FOR 0.5 MILE TO A T- ROAD LEFT WHICH IS ABOUT 50 FEET BEFORE REACHING A FLYING A SERVICE STATION ON THE LEFT. A PENNSYLVANIA STATE HIGHWAY DEPARTMENT BUILDING IS ON THE EAST SIDE OF THE ROAD. TURN LEFT, ON THE T-ROAD AND GO NORTHWEST AND WEST, ON A CINDERED ROAD FOR 0.15 MILE TO THE TOP OF A RIDGE AND SIDE ROAD RIGHT, BEAR LEFT AND FOLLOW A TRACK ROAD, WEST AND SOUTHWEST, ALONG THE NORTHWEST EDGE OF AN OLD STRIP MINE, FOR 0.35 MILE TO THE SOUTH END OF A GRASS COVERED HILL AND STATION ON THE RIGHT. ALL MARKS ARE STANDARD DISKS, SET IN THE TOP OF SQUARE CONCRETE MONUMENTS. STATION MARK IS STAMPED THROOP 1959 AND IS FLUSH WITH THE GROUND SURFACE. IT IS ABOUT 47 FEET NORTHWEST OF A TRACK ROAD, 32 FEET EAST-SOUTHEAST OF A 3-TRUNK, WILD CHERRY TREE, 70 FEET SOUTHWEST OF THE CREST OF THE HILL AND 4.2 FEET SOUTH OF A STANDARD METAL WITNESS POST. REFERENCE MARK 1 IS STAMPED THROOP NO 1 1959 AND IS FLUSH WITH THE GROUND SURFACE. IT IS ABOUT 32 FEET NORTHWEST OF THE TRACK ROAD, 45 FEET EAST-SOUTHEAST OF THE WILD CHERRY TREE AND 11.6 FEET EAST-NORTHEAST OF THE WITNESS POST. REFERENCE MARK 2 IS STAMPED THROOP NO 2 1959 AND IS FLUSH WITH THE GROUND SURFACE. IT IS ABOUT 15 FEET EAST OF THE CHERRY TREE, 64 FEET NORTHWEST OF THE TRACK ROAD AND 21.5 FEET NORTH-NORTHEAST OF THE WITNESS POST. HEIGHT OF LIGHT ABOVE STATION MARK 1 METER.
01/01/1973 by LOCENG (SEE DESCRIPTION)
RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1973 RECOVERED BY JOHN R. KEARNEY, R.E. THROOP 1959 POOR-STANDARD DISC DESTROYED. RM 1 AND RM 2 RECOVERED IN GOOD CONDITION. STATION MARK IS DAMAGED. STANDARD DISC DESTROYED. CONC. MON. PARTIALLY BROKEN AT TOP. TO REACH STATION FROM JUNCTION OF US HIGHWAYS 611,11 AND STATE HIGHWAY 307, GO NORTH ON HIGHWAY 611 AND SOUTH BLAKELY ST. FOR 0.2 MILES TO A TRAFFIC LIGHT AND WHERE HIGHWAY TURNS RIGHT, CONTINUE STRAIGHT AHEAD, NORTH, ON NORTH BLAKELY STREET FOR 0.8 MILE TO A BRIDGE WHICH SPANS ROUTE I-81, CROSS BRIDGE AND CONTINUE STRAIGHT AHEAD ON NORTH BLAKELY ST. FOR ST. FOR 0.3 MILE TO A PAVED DRIVEWAY LEFT WHICH IS JUST PAST AN ARCO SERVICE STATION ON THE LEFT. TURN LEFT ON THE PAVED DRIVEWAY TO HADDON CRAFTSMAN FOR 0.2 MILE TO THE HADDON CRAFTSMAN BUILDING. STATION IS LEFT OF (SOUTH) BUILDING 0.1 MILE ON A GRASSY HILL. THE TRACK ROAD DESCRIBED BEFORE CAN NO LONGER BE USED TO GET TO THE STATION.
01/01/1974 by NGS (SEE DESCRIPTION)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 (CLN) THE STATION SURFACE DISK WAS FOUND DESTROYED. THE SUB-SURFACE DISK WAS FOUND IN GOOD CONDITION. A NEW SURFACE DISK WAS SET. BOTH REFERENCE MARKS WERE RECOVERED AND FOUND IN GOOD CONDITION. THE DISTANCE AND DIRECTION TO BOTH REFERENCE MARKS WERE WITHIN CLOSE AGREEMENT WITH THE 1959 OBSERVATIONS. THE LINE TO SCRANTON, TV STATION WDAU SOUTH MAST 1959, NOW COMES THROUGH BRUSH AND TREES AND IT WAS NOT INTERSECTED AT THIS DATE. A COMPLETE NEW DESCRIPTION OF THE STATION FOLLOWS. THE STATION IS LOCATED IN THE NORTHEAST EDGE OF SCRANTON, ABOUT 1 MILE SOUTH OF THE SMALL TOWN OF THROOP AND ON THE SOUTHEAST EDGE OF A BRUSH COVERED HILL. THE PROPERTY IS OWNED BY THE HUDSON COAL COMPANY OF SCRANTON. TO REACH FROM THE INTERSECTION OF INTERSTATE HIGHWAY 81 AND STATE HIGHWAY 347 IN THE NORTHEAST PART OF SCRANTON, GO NORTHERLY ON STATE HIGHWAY 347 FOR 0.1 MILE TO A CEMETERY ON THE LEFT. CONTINUE NORTHERLY ON STATE HIGHWAY 347 FOR 0.05 MILE TO A SIDE ROAD LEFT. TURN LEFT AND GO EAST ON A PAVED ROAD FOR 0.15 MILE TO THE SOUTHWEST CORNER OF A LARGE BUILDING OWNED BY THE HADDON CRAFTSMEN COMPANY. THIS POINT IS END OF TRUCK TRAVEL IN WET WEATHER. GO SOUTHERLY UP THE NORTHEAST SIDE OF THE HILL FOR 0.05 MILE TO THE TOP OF THE HILL. GO SOUTHEAST ACROSS THE TOP OF THE HILL FOR ABOUT 0.05 MILE TO THE SOUTHEAST EDGE OF THE HILL AND THE STATION. THE STATION MARK IS A STANDARD DISK STAMPED THROOP 1959 1974, SET IN THE TOP OF A 8-INCH ROUND CONCRETE MONUMENT WHICH IS FLUSH WITH THE SURFACE. IT IS 6.4 FEET SOUTH OF A WITNESS POST, 32 FEET EAST-SOUTHEAST OF A WILD CHERRY TREE, 42 FEET NORTHWEST OF A DIM TRACK ROAD AND 70 FEET SOUTHWEST OF THE CREST OF THE HILL. (NOTE 1B 7A) REFERENCE MARK 1 IS A STANDARD DISK STAMPED THROOP NO 1 1959, SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT WHICH IS FLUSH WITH THE SURFACE. IT IS 17 FEET WEST OF THE WITNESS POST, 32 FEET NORTHWEST OF THE CENTER OF THE TRACK ROAD AND 45 FEET EAST-SOUTHEAST OF THE WILD CHERRY TREE. (NOTE 11A) REFERENCE MARK 2 IS A STANDARD DISK STAMPED THROOP NO 2 1959, SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT WHICH IS FLUSH WITH THE SURFACE. IT IS 15 FEET EAST OF THE WILD CHERRY TREE, 19 FEET WEST OF THE WITNESS POST AND 64 FEET NORTHWEST OF THE DIM TRACK ROAD. (NOTE 11A) INTERSECTION STATION SCRUB OAK LOOKOUT TOWER 1959 MAY BE USED AS A AZIMUTH MARK FOR THIS STATION, SEE DESCRIPTION THEREOF. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN- 1 MILE SOUTH OF THROOP

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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