GR0587 ***********************************************************************
GR0587  DESIGNATION -  R 135
GR0587  PID         -  GR0587
GR0587  STATE/COUNTY-  AZ/MOHAVE
GR0587  USGS QUAD   -  HOOVER DAM (1984)
GR0587
GR0587                         *CURRENT SURVEY CONTROL
GR0587  ___________________________________________________________________
GR0587* NAD 83(1986)-  36 00 55.     (N)    114 44 12.     (W)     SCALED
GR0587* NAVD 88     -       376.387  (meters)    1234.86   (feet)  ADJUSTED
GR0587  ___________________________________________________________________
GR0587  GEOID HEIGHT-         -28.26  (meters)                     GEOID99
GR0587  DYNAMIC HT  -         376.018 (meters)    1233.65  (feet)  COMP
GR0587  MODELED GRAV-     979,642.6   (mgal)                       NAVD 88
GR0587
GR0587  VERT ORDER  -  FIRST     CLASS I
GR0587
GR0587.The horizontal coordinates were scaled from a topographic map and have
GR0587.an estimated accuracy of +/- 6 seconds.
GR0587
GR0587.The orthometric height was determined by differential leveling
GR0587.and adjusted by the National Geodetic Survey in June 1991.
GR0587
GR0587.The geoid height was determined by GEOID99.
GR0587
GR0587.The dynamic height is computed by dividing the NAVD 88
GR0587.geopotential number by the normal gravity value computed on the
GR0587.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
GR0587.degrees latitude (G = 980.6199 gals.).
GR0587
GR0587.The modeled gravity was interpolated from observed gravity values.
GR0587
GR0587;                    North         East    Units  Estimated Accuracy
GR0587;SPC AZ W     -   556,680.      124,420.      MT  (+/- 180 meters Scaled)
GR0587
GR0587                          SUPERSEDED SURVEY CONTROL
GR0587
GR0587  NGVD 29     -       375.670  (m)         1232.51   (f) ADJ UNCH    1 1
GR0587
GR0587.Superseded values are not recommended for survey control.
GR0587.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
GR0587.See file dsdata.txt to determine how the superseded data were derived.
GR0587
GR0587_MARKER: DB = BENCH MARK DISK
GR0587_SETTING: 30 = SIDEWALK
GR0587_STAMPING: R 135 1935
GR0587_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
GR0587
GR0587  HISTORY     - Date     Condition        Recov. By
GR0587  HISTORY     - 1935     MONUMENTED       CGS
GR0587  HISTORY     - 1950     GOOD             NGS
GR0587  HISTORY     - 1963     GOOD             NGS
GR0587  HISTORY     - 1981     GOOD             NGS
GR0587  HISTORY     - 1990     GOOD             USPSQD
GR0587  HISTORY     - 1990     GOOD             USPSQD
GR0587
GR0587                          STATION DESCRIPTION
GR0587
GR0587''DESCRIBED BY NATIONAL GEODETIC SURVEY 1950
GR0587''IN HOOVER DAM.
GR0587''ON TOP OF HOOVER DAM, ABOUT 70 YARDS SOUTHEAST OF THE CENTER, 45.4
GR0587''FEET SOUTHEAST OF THE EAST CORNER OF THE ARIZONA ELEVATOR TOWER, NEAR
GR0587''THE CENTER OF THE SOUTHWEST (DOWNSTREAM) SIDE OF BLOCK G, DIRECTLY
GR0587''OPPOSITE THE CENTER OF AN OBSERVATION NICHE, IN THE TOP OF THE
GR0587''SOUTHWEST SIDEWALK, AND 0.4 FOOT SOUTHWEST OF THE NORTHEAST EDGE.
GR0587
GR0587                          STATION RECOVERY (1963)
GR0587
GR0587''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1963
GR0587''RECOVERED IN GOOD CONDITION.
GR0587
GR0587                          STATION RECOVERY (1981)
GR0587
GR0587''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1981
GR0587''RECOVERED IN GOOD CONDITION.
GR0587
GR0587                          STATION RECOVERY (1990)
GR0587
GR0587''RECOVERY NOTE BY US POWER SQUADRON 1990 (MG)
GR0587''RECOVERED IN GOOD CONDITION.
GR0587
GR0587                          STATION RECOVERY (1990)
GR0587
GR0587''RECOVERY NOTE BY US POWER SQUADRON 1990 (GG)
GR0587''RECOVERED IN GOOD CONDITION.