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Details for Benchmark: BL1615

N 30° 01.300 W 095° 49.900 (NAD 83)

Altitude: 214.98

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

Location:
In HARRIS county, TX View Original Datasheet
Designation:
N 1009
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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It's been 7 years since it was last visited, recovered as described (and per the updated/corrected coordinates) and in good condition.

[Photos:]
photoBL1615 - N 1009 - 1
photoBL1615 - N 1009 - 2
photoBL1615 - N 1009 - 3
photoBL1615 - N 1009 - 4

Recovered as described in good condition.

[Photos:]
photoBL1615
photoBL1615 setting

Found in good condition as described.

[Photos:]
photoDisk Closeup
photoDisk Area

Documented History (by the NGS)

01/01/1954 by CGS (MONUMENTED)
01/01/1973 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 0.9 MI SE FROM HOCKLEY. ABOUT 0.9 MILE SOUTHEAST ALONG US HIGHWAY 290 FROM THE JUNCTION OF US HIGHWAY 290 AND HEGAR RD., AT THE BADTKE RD. CROSSING, SET IN THE TOP EAST END OF THE NORTH CONCRETE HEADWALL TO A 2-CHANNEL BOX CULVERT UNDER THE RAILROAD, 68.2 FEET SOUTH OF THE CENTER LINE OF US HIGHWAY 290, 36 FEET EAST OF THE CENTER LINE OF BADTKE RD., 9.5 FEET NORTH OF THE NORTH RAIL, 1 FOOT WEST OF THE EAST END OF THE NORTH HEADWALL, AND ABOUT 2 FEET BELOW THE LEVEL OF THE RAILS.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
01/01/1986 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1986 RECOVERED IN GOOD CONDITION.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (BB) RECOVERED IN GOOD CONDITION.
03/26/1994 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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