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Details for Benchmark: AW5413

N 29° 45.850 W 095° 49.350 (NAD 83)

Altitude: 126.94

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

Location:
In FORT BEND county, TX View Original Datasheet
Designation:
M 1504
Marker Type:
bench mark disk
Setting:
retaining walls, concrete ledge, etc.
Stability:
May hold, but of type commonly subject to surface motion.

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located today, and its in fine shape. Cold and windy. Looks like construction is pending in the area, perhaps to widen the road. We'll see.

[Photos:]
photobenchmark on the bridge

Still in good shape.

found it, as described below, on Katy-Flewellen, not Pin Oak.

Recovered as described in good condition.

[Photos:]
photoAW5413
photoAW5413 setting

Visited to take the pictures the previous person didn't.

[Photos:]
photoDisk Closeup
photoArea looking east

As previously stated, Pin Oak Road is now Katy-Flewellen Road. Mark found in good condition.

N 29° 45.909 W 095° 49.363

I initially had a problem with this one; Pin Oak Road actually dead ends prior to getting to the coordinates. I found out that the road now using the bridge is now called Katy-Flewellen. The M 1504 was easily seen upon the Bench Mark.

Documented History (by the NGS)

01/01/1986 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1986 2.7 KM (1.7 MI) SOUTH FROM KATY. 2.7 KM (1.7 MI) SOUTH ALONG PIN OAK ROAD FROM THE JUNCTION OF US HIGHWAY 90 IN KATY, IN TOP OF THE SOUTHEAST END OF THE SOUTHWEST ABUTMENT OF A BRIDGE OVER BUFFALO BAYOU, 4.3 METERS (14.1 FT) SOUTHEAST OF THE CENTERLINE OF THE ROAD, 0.2 METER (0.5 FT) SOUTHEAST OF A METAL GUARD RAIL. THE MARK IS ABOVE LEVEL WITH THE ROAD.
06/25/1994 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1994 RECOVERED IN GOOD CONDITION.

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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