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Details for Benchmark: DV1253

N 33° 35.600 W 112° 05.700 (NAD 83)

Altitude: 1358.88

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

Location:
In MARICOPA county, AZ View Original Datasheet
Designation:
T 474
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Recovered as described, in good condition. Normally this mark would not be accessible, but I got lucky and arrived when some City of Phoenix workers were on-site with the gates open. I was allowed to look for the marks inside the fenced area.

[Photos:]
photoT 474 / DV1253
A close-up of the mark, with the GPSr.
photoT 474 / DV1253
A close-up of the mark alone. The mark has been slightly marred by falling rocks, not vandalism.
photoT 474 / DV1253
A wider view of the general area.

Documented History (by the NGS)

01/01/1981 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1981 15.9 KM (9.85 MI) NE FROM PHOENIX. 13.4 KM (8.3 MI) NORTH ALONG INTERSTATE HIGHWAY 17 FROM THE INTERSECTION OF GRAND AVENUE AT PHOENIX, THENCE 1.6 KM (1.0 MI) EAST ALONG CACTUS ROAD, THENCE 0.5 KM (0.3 MI) SOUTH ALONG 19TH AVENUE, THENCE 0.4 KM (0.25 MI) EAST ALONG SUNNYSIDE DRIVE, IN TOP OF A GRANITE OUTCROP, 4.8 METERS (15.8 FT) NORTH-NORTHEAST OF THE NORTH-NORTHEAST EDGE OF THE WEST ONE OF TWO WATER TANKS, 42.2 METERS (138.4 FT) NORTHWEST OF BENCH MARK S 474. THE MARK IS 0.55 METERS SW FROM A WITNESS POST. THE MARK IS 0.15 M BELOW THE TOP OF THE TANK FLOOR.
01/01/1981 by AZDT (GOOD)
RECOVERY NOTE BY ARIZONA DEPARTMENT OF TRANSPORTATION 1981 9.0 MI (14.5 KM) NORTH ALONG INTERSTATE 17 FROM THE INTERSECTION OF MCDOWELL ROAD IN PHOENIX, TO CACTUS ROAD. THENCE 1 MILE (1.6 KM) EAST ALONG CACTUS ROAD TO 19TH AVENUE, THENCE 0.25 MILE (0.40 KM) SOUTH ALONG 19TH AVENUE TO SUNNYSIDE DRIVE, THENCE 0.25 MILE (0.40 KM) EAST ALONG SUNNYSIDE DRIVE TO THE SUNNYSLOPE WATER TANKS AND THE MARK. 15.3 FT (4.66 METERS) NORTH OF THE NORTH FACE OF THE WEST TANK. 74.6 FT (22.74 METERS) NORTHWEST OF THE WEST FACE OF THE EAST TANK. 1.6 FT (0.49 METER) SOUTHWEST OF A METAL WITNESS POST AND SIGN.
05/04/1991 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1991 (RFH) MARK NOT FOUND.

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 June 1991.
  • 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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