This benchmark is located on the west entry steps of the Uvalde County courthouse in downtown Uvalde TX.
From the NGS Datasheet: (
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"AY1368 DESIGNATION - V 482
AY1368 PID - AY1368
AY1368 STATE/COUNTY- TX/UVALDE
AY1368 USGS QUAD - UVALDE (1974)
AY1368
AY1368 *CURRENT SURVEY CONTROL
AY1368 ___________________________________________________________________
AY1368* NAD 83(1986)- 29 12 34. (N) 099 47 12. (W) SCALED
AY1368* NAVD 88 - 276.733 (meters) 907.91 (feet) ADJUSTED
AY1368 ___________________________________________________________________
AY1368 GEOID HEIGHT- -22.88 (meters) GEOID99
AY1368 DYNAMIC HT - 276.331 (meters) 906.60 (feet) COMP
AY1368 MODELED GRAV- 979,184.3 (mgal) NAVD 88
AY1368
AY1368 VERT ORDER - FIRST CLASS II
AY1368
AY1368.The horizontal coordinates were scaled from a topographic map and have
AY1368.an estimated accuracy of +/- 6 seconds.
AY1368
AY1368.The orthometric height was determined by differential leveling
AY1368.and adjusted by the National Geodetic Survey in June 1991.
AY1368
AY1368.The geoid height was determined by GEOID99.
AY1368
AY1368.The dynamic height is computed by dividing the NAVD 88
AY1368.geopotential number by the normal gravity value computed on the
AY1368.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
AY1368.degrees latitude (G = 980.6199 gals.).
AY1368
AY1368.The modeled gravity was interpolated from observed gravity values.
AY1368
AY1368; North East Units Estimated Accuracy
AY1368;SPC TXSC - 4,152,770. 523,510. MT (+/- 180 meters Scaled)
AY1368
AY1368 SUPERSEDED SURVEY CONTROL
AY1368
AY1368 NGVD 29 - 276.588 (m) 907.44 (f) ADJ UNCH 1 2
AY1368
AY1368.Superseded values are not recommended for survey control.
AY1368.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
AY1368.See file dsdata.txt to determine how the superseded data were derived.
AY1368
AY1368_MARKER: DB = BENCH MARK DISK
AY1368_SETTING: 30 = STEP
AY1368_STAMPING: V 482 1935 907.456
AY1368_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
AY1368
AY1368 HISTORY - Date Condition Recov. By
AY1368 HISTORY - 1935 MONUMENTED CGS
AY1368 HISTORY - 1957 GOOD NGS
AY1368 HISTORY - 1982 GOOD NGS
AY1368
AY1368 STATION DESCRIPTION
AY1368
AY1368''DESCRIBED BY NATIONAL GEODETIC SURVEY 1957
AY1368''IN UVALDE.
AY1368''IN THE TOP OF THE SECOND STEP FROM THE BOTTOM OF THE STEPS LEADING TO
AY1368''THE WEST ENTRANCE TO THE COURT HOUSE, 19 FEET SOUTH OF THE CENTER LINE
AY1368''OF THE ENTRANCE, 4 INCHES NORTH OF THE SOUTH END OF THE STEP AND ABOUT
AY1368''1 FOOT ABOVE THE GROUND.
AY1368
AY1368 STATION RECOVERY (1982)
AY1368
AY1368''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
AY1368''RECOVERED IN GOOD CONDITION."