National Geodetic Survey, Retrieval Date = SEPTEMBER 25, 2002 LU2121 *********************************************************************** LU2121 DESIGNATION - BACKBONE LOOKOUT HOUSE 1961 LU2121 PID - LU2121 LU2121 STATE/COUNTY- CA/TRINITY LU2121 USGS QUAD - THURSTON PEAKS (1982) LU2121 LU2121 *CURRENT SURVEY CONTROL LU2121 ___________________________________________________________________ LU2121* NAD 83(1992)- 40 53 21.42596(N) 123 08 32.81409(W) ADJUSTED LU2121* NAVD 88 - 1419. (meters) 4656. (feet) SCALED LU2121 ___________________________________________________________________ LU2121 EPOCH DATE - 1991.35 LU2121 LAPLACE CORR- 6.27 (seconds) DEFLEC99 LU2121 GEOID HEIGHT- -25.74 (meters) GEOID99 LU2121 LU2121 HORZ ORDER - THIRD LU2121 LU2121.The horizontal coordinates were established by classical geodetic methods LU2121.and adjusted by the National Geodetic Survey in March 1994. LU2121.The horizontal coordinates are valid at the epoch date displayed above. LU2121.The epoch date for horizontal control is a decimal equivalence LU2121.of Year/Month/Day. LU2121 LU2121.The orthometric height was scaled from a topographic map. LU2121 LU2121.The Laplace correction was computed from DEFLEC99 derived deflections. LU2121 LU2121.The geoid height was determined by GEOID99. LU2121 LU2121; North East Units Scale Converg. LU2121;SPC CA 1 - 673,396.164 1,903,732.064 MT 0.99989508 -0 44 49.3 LU2121;SPC CA 1 - 2,209,300.58 6,245,827.61 sFT 0.99989508 -0 44 49.3 LU2121;UTM 10 - 4,526,476.529 487,999.849 MT 0.99960177 -0 05 35.7 LU2121 LU2121 SUPERSEDED SURVEY CONTROL LU2121 LU2121 NAD 83(1986)- 40 53 21.41737(N) 123 08 32.82231(W) AD(1984.00) 4 LU2121 NAD 27 - 40 53 21.91600(N) 123 08 28.69700(W) AD( ) 3 LU2121 LU2121.Superseded values are not recommended for survey control. LU2121.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. LU2121.See file dsdata.txt to determine how the superseded data were derived. LU2121 LU2121 HISTORY - Date Condition Report By LU2121 HISTORY - 1961 MONUMENTED CGS LU2121 LU2121 STATION DESCRIPTION LU2121 LU2121'DESCRIBED BY COAST AND GEODETIC SURVEY 1961 (JCC) LU2121'THE STATION IS THE TOP-CENTER OF THE CHIMNEY OF THE LOOKOUT LU2121'HOUSE. IT IS A WOOD BUILDING AND THE HEIGHT TO THE TOP OF LU2121'THE CHIMNEY IS 13 FEET. A MEASUREMENT WAS MADE FROM TRIANGULATION LU2121'STATION BACKBONE (USGS) AND THE DISTANCE WAS FOUND TO BE 25.98 LU2121'FEET OR 7.921 METERS SOUTH-SOUTHWEST OF THE MARK. LU2121' LU2121'THE LOOKOUT HOUSE IS ON THE NORTH END OF BACKBONE RIDGE, ABOUT LU2121'15 MILES NORTHWEST OF WEAVERVILLE AND 8 MILES NORTH OF HELENA.