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Details for Benchmark: DV0491

N 33° 26.633 W 112° 05.733 (NAD 83)

Altitude: 1075.1

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

Location:
In MARICOPA county, AZ View Original Datasheet
Designation:
H 271
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

Must Read!

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Found it on top of R/R bridge. There seems to be a homeless camp there also. A little hard to read.

[Photos:]
photoDV0491 H271
the mark
photoDV0491 H271
looking east
photoDV0491 H271
looking west
photoDV0491 H271
looking north toward bridge

Nice Clean some dirt away

Found easily after walking a short distance. Surprised at accessibility. Mark is in the depression between wall and a "sidewalk" with a white arrow/circle pointing to it.

Mark was covered in debris and required a little cleaning. But otherwise in decent condition

[Photos:]
photoDV0491-close
photoDV0491-facing east

Had to move some junk, but recovered in good condition on the southwest side of the viaduct.

[Photos:]
photoThe mark
photoThe mark with my GPSr and junk
photoLooking south
photoLooking west
photoPassing by...

recoverd, benchmark is scratched up and had been buried under a pile of garbage

[Photos:]
photoDV0491
photoDV0491 with GPSr
photolooking west past DV0491

Located as described with friends and family today

[Photos:]
photoDV0491 / H271

Recovered as described. GPS (HH2) co-ordinates N33º26.633 W112º05.750.

[This entry was edited by AZcachemeister on Saturday, August 01, 2009 at 6:20:16 AM.]

[Photos:]
photoH 271 / DV0491
A close-up of the mark.
photoH 271 / DV0491
Looking to the west.
photoH 271 / DV0491
Above that corner of the overpass.

Documented History (by the NGS)

01/01/1948 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1948 1.0 MI W FROM PHOENIX. 1.0 MILE WEST ALONG THE SOUTHERN PACIFIC CO. RAILROAD FROM THE UNION STATION AT PHOENIX, 15.6 FEET SOUTH OF MAIN TRACK, 4.7 FEET EAST OF WEST EDGE, SET IN THE SOUTH CONCRETE GUARD RAIL AT WEST END OF THE UNDERPASS OF THE RAILROAD AND STATE HIGHWAY 80, ABOUT LEVEL WITH THE MAIN TRACK AND 1.0 FOOT ABOVE THE LEVEL OF THE GROUND.
01/01/1960 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1960 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The geoid height was determined by GEOID99.

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