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Details for Benchmark: KX1603

N 40° 48.417 W 079° 57.900 (NAD 83)

Altitude: 979.35

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

Location:
In BUTLER county, PA View Original Datasheet
Designation:
W 4
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Took a little work. It was buried beneath 8-10 inches of ballast and dirt. Almost the entire lower ledge of the boulder was covered.

[Photos:]
photoClose up
photoFrom the tracks.
Faded "BM" on the boulder to help locate it.
photoTo southeast.
A view back toward the road crossing in Renfrew. You can see the amount of ballast that had to be removed to expose the bench mark.

Regarding csrbloodbot noting that the BM is in the NE corner of the rock, and not the NW corner, you'll also note that the description indicates that it is 7 feet from the EAST rail. But the tracks here are going NW-SE. So the nearest rail would be either the S rail or the W rail. However, this rail line is generally a N-S line, from Butler to Evans City. The descriptions of these older (1930s) bench marks always use the general alignment of the track in the directions. Hence, 7 feet from the E rail for a N-S track. So if you rotate the tracks to a N-S alignment, as they are describing, and rotate the rock with it, that puts the BM in NW corner of the rock. That's why it says NW instead of NE. You will find that bridge abutment designations also are sometimes wrong in the descriptions for the same reason.

Easy find.

Easy find using Bloodbot's description.

[Photos:]
photoKX1603

This marker was pretty well covered in dirt. The official description refers to a B&O station and a water tank which are no longer in existence. The marker is about 30 yards west of the intersection of Meridian Road and the railroad tracks on the south side of the tracks. The marker is set in the Northeast corner of the large rock NOT the Northwest corner as stated in the official description.

VISIT www.bloodbot.com

[last edit: 10/25/2003 4:21:14 PM PST]

[last edit: 10/25/2003 6:23:36 PM PST]

[last edit: 10/30/2003 9:57:54 AM PST]

[Photos:]
photomarker
photoContext1
photocontext2
photoContext3
The B.M. scratched in the stone presumably indicate a Benchmark nearby. The marker it self is at the bottom center portion of the photo.

Documented History (by the NGS)

1/1/1931 by CGS (MONUMENTED)
1/1/1952 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1952 AT RENFREW. AT RENFREW, BUTLER COUNTY, 5 RAILS SOUTHWEST OF THE DOOR TO THE WAITING ROOM OF THE BALTIMORE AND OHIO RAILROAD STATION, 13 FEET SOUTH OF THE MIDDLE OF A WOODEN WATER TANK AND 7 FEET FROM THE EAST RAIL, IN THE NORTHWEST CORNER OF A LARGE ROCK. A STANDARD DISK, STAMPED W 4 1931.

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 1992. * This is a POSTED BENCH MARK height. Code A indicates a distribution rate of 0.0 thru 1.0 mm/km.
  • 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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