GR0583 ***********************************************************************
GR0583  DESIGNATION -  G 174
GR0583  PID         -  GR0583
GR0583  STATE/COUNTY-  NV/CLARK
GR0583  USGS QUAD   -  HOOVER DAM (1984)
GR0583
GR0583                         *CURRENT SURVEY CONTROL
GR0583  ___________________________________________________________________
GR0583* NAD 83(1986)-  36 00 58.     (N)    114 44 14.     (W)     SCALED
GR0583* NAVD 88     -       376.376  (meters)    1234.83   (feet)  ADJUSTED
GR0583  ___________________________________________________________________
GR0583  GEOID HEIGHT-         -28.26  (meters)                     GEOID99
GR0583  DYNAMIC HT  -         376.007 (meters)    1233.62  (feet)  COMP
GR0583  MODELED GRAV-     979,643.2   (mgal)                       NAVD 88
GR0583
GR0583  VERT ORDER  -  FIRST     CLASS I
GR0583
GR0583.The horizontal coordinates were scaled from a topographic map and have
GR0583.an estimated accuracy of +/- 6 seconds.
GR0583
GR0583.The orthometric height was determined by differential leveling
GR0583.and adjusted by the National Geodetic Survey in June 1991.
GR0583
GR0583.The geoid height was determined by GEOID99.
GR0583
GR0583.The dynamic height is computed by dividing the NAVD 88
GR0583.geopotential number by the normal gravity value computed on the
GR0583.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
GR0583.degrees latitude (G = 980.6199 gals.).
GR0583
GR0583.The modeled gravity was interpolated from observed gravity values.
GR0583
GR0583;                    North         East    Units  Estimated Accuracy
GR0583;SPC NV E     - 8,140,790.      276,270.      MT  (+/- 180 meters Scaled)
GR0583
GR0583                          SUPERSEDED SURVEY CONTROL
GR0583
GR0583  NGVD 29     -       375.659  (m)         1232.47   (f) ADJ UNCH    1 1
GR0583
GR0583.Superseded values are not recommended for survey control.
GR0583.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
GR0583.See file dsdata.txt to determine how the superseded data were derived.
GR0583
GR0583_MARKER: DB = BENCH MARK DISK
GR0583_SETTING: 30 = SIDEWALK
GR0583_STAMPING: G 174 1935
GR0583_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
GR0583
GR0583  HISTORY     - Date     Condition        Recov. By
GR0583  HISTORY     - 1935     MONUMENTED       CGS
GR0583  HISTORY     - 1950     GOOD             NGS
GR0583  HISTORY     - 1963     GOOD             NGS
GR0583  HISTORY     - 1981     GOOD             NGS
GR0583  HISTORY     - 1990     GOOD             USPSQD
GR0583  HISTORY     - 1990     GOOD             USPSQD
GR0583  HISTORY     - 19961102 GOOD             USPSQD
GR0583
GR0583                          STATION DESCRIPTION
GR0583
GR0583''DESCRIBED BY NATIONAL GEODETIC SURVEY 1950
GR0583''IN HOOVER DAM.
GR0583''ON TOP OF HOOVER DAM, ABOUT 135 YARDS EAST OF THE NORTHWEST (NEVADA)
GR0583''END, ABOUT 70 YARDS WEST OF THE CENTER, NEAR THE CENTER OF THE SOUTH
GR0583''(DOWNSTREAM) SIDE OF BLOCK N, 45.5 FEET WEST OF THE NORTHWEST CORNER
GR0583''OF THE NEVADA ELEVATOR TOWER, DIRECTLY OPPOSITE THE CENTER OF AN
GR0583''OBSERVATION NICHE, AND IN THE TOP OF THE NORTH EDGE OF THE SOUTH
GR0583''SIDEWALK.
GR0583
GR0583                          STATION RECOVERY (1963)
GR0583
GR0583''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1963
GR0583''RECOVERED IN GOOD CONDITION.
GR0583
GR0583                          STATION RECOVERY (1981)
GR0583
GR0583''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1981
GR0583''RECOVERED IN GOOD CONDITION.
GR0583
GR0583                          STATION RECOVERY (1990)
GR0583
GR0583''RECOVERY NOTE BY US POWER SQUADRON 1990 (GG)
GR0583''RECOVERED IN GOOD CONDITION.
GR0583
GR0583                          STATION RECOVERY (1990)
GR0583
GR0583''RECOVERY NOTE BY US POWER SQUADRON 1990 (MG)
GR0583''RECOVERED IN GOOD CONDITION.
GR0583
GR0583                          STATION RECOVERY (1996)
GR0583
GR0583''RECOVERY NOTE BY US POWER SQUADRON 1996
GR0583''RECOVERED IN GOOD CONDITION.