National Geodetic Survey, Retrieval Date = SEPTEMBER 25, 2002 LU2122 *********************************************************************** LU2122 DESIGNATION - BACKBONE LU2122 PID - LU2122 LU2122 STATE/COUNTY- CA/TRINITY LU2122 USGS QUAD - THURSTON PEAKS (1982) LU2122 LU2122 *CURRENT SURVEY CONTROL LU2122 ___________________________________________________________________ LU2122* NAD 83(1992)- 40 53 21.18777(N) 123 08 32.94050(W) ADJUSTED LU2122* NAVD 88 - 1419.20 (+/-2cm) 4656.2 (feet) VERTCON LU2122 ___________________________________________________________________ LU2122 EPOCH DATE - 1991.35 LU2122 LAPLACE CORR- 6.26 (seconds) DEFLEC99 LU2122 GEOID HEIGHT- -25.74 (meters) GEOID99 LU2122 LU2122 HORZ ORDER - SECOND LU2122 VERT ORDER - THIRD ? (See Below) LU2122 LU2122.The horizontal coordinates were established by classical geodetic methods LU2122.and adjusted by the National Geodetic Survey in March 1994. LU2122.The horizontal coordinates are valid at the epoch date displayed above. LU2122.The epoch date for horizontal control is a decimal equivalence LU2122.of Year/Month/Day. LU2122 LU2122.The NAVD 88 height was computed by applying the VERTCON shift value to LU2122.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) LU2122.The vertical order pertains to the superseded datum. LU2122 LU2122.The Laplace correction was computed from DEFLEC99 derived deflections. LU2122 LU2122.The geoid height was determined by GEOID99. LU2122 LU2122; North East Units Scale Converg. LU2122;SPC CA 1 - 673,388.856 1,903,729.010 MT 0.99989508 -0 44 49.4 LU2122;SPC CA 1 - 2,209,276.61 6,245,817.59 sFT 0.99989508 -0 44 49.4 LU2122;UTM 10 - 4,526,469.189 487,996.879 MT 0.99960177 -0 05 35.8 LU2122 LU2122: Primary Azimuth Mark Grid Az LU2122:SPC CA 1 - BACKBONE AZ MK 200 12 23.0 LU2122:UTM 10 - BACKBONE AZ MK 199 33 09.4 LU2122 LU2122|---------------------------------------------------------------------| LU2122| PID Reference Object Distance Geod. Az | LU2122| dddmmss.s | LU2122| LU2121 BACKBONE LOOKOUT HOUSE 1961 7.921 METERS 02156 | LU2122| DB4644 BACKBONE RM 2 12.932 METERS 05023 | LU2122| DB4643 BACKBONE RM 1 13.362 METERS 11542 | LU2122| DB4642 BACKBONE AZ MK 1992733.6 | LU2122| LU2119 BACKBONE RM BOLT 11.679 METERS 33115 | LU2122|---------------------------------------------------------------------| LU2122 LU2122 SUPERSEDED SURVEY CONTROL LU2122 LU2122 NAD 83(1986)- 40 53 21.17919(N) 123 08 32.94872(W) AD(1984.00) 2 LU2122 NAD 27 - 40 53 21.67780(N) 123 08 28.82330(W) AD( ) 2 LU2122 NGVD 29 - 1418.27 (m) 4653.1 (f) LEVELING 3 LU2122 LU2122.Superseded values are not recommended for survey control. LU2122.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. LU2122.See file dsdata.txt to determine how the superseded data were derived. LU2122 LU2122_MARKER: Z = SEE DESCRIPTION LU2122_SETTING: 0 = UNSPECIFIED SETTING LU2122 LU2122 HISTORY - Date Condition Report By LU2122 HISTORY - 1961 MONUMENTED CGS LU2122 LU2122 STATION DESCRIPTION LU2122 LU2122'DESCRIBED BY COAST AND GEODETIC SURVEY 1961 (JCC) LU2122'THE STATION IS ON THE NORTH END OF BACKBONE RIDGE, ABOUT 15 LU2122'MILES NORTHWEST OF WEAVERVILLE, AND 8 MILES NORTH OF HELENA. LU2122' LU2122'TO REACH THE STATION FROM THE HELENA POST OFFICE, GO WEST LU2122'ON U.S. HIGHWAY 299 FOR 1.5 MILES TO THE WEST END OF A BRIDGE LU2122'AND A SIDE ROAD RIGHT. TURN RIGHT AND GO NORTHERLY ON PAVED LU2122'ROAD FOR 4.0 MILES TO A FORK AND SIGN BACKBONE LO-HOBO GULCH. LU2122'TURN LEFT AND GO 7.8 MILES TO THE SUMMIT OF THE PASS AND A LU2122'SIDE ROAD RIGHT. TURN SHARP RIGHT AND GO 0.25 MILE TO THE LU2122'AZIMUTH MARK ON THE LEFT. CONTINUE FOR 0.75 MILE TO THE LU2122'LOOKOUT HOUSE AND THE STATION. LU2122' LU2122'THE STATION MARK IS A U.S. GEOLOGICAL SURVEY BENCH MARK DISK, LU2122'STAMPED 4653 BACKBONE 1949, CEMENTED IN A DRILL HOLE IN THE LU2122'TOP OF A LARGE OUTCROP OF BEDROCK THAT PROJECTS 4 FEET ON THE LU2122'NORTH SIDE AND 15 FEET ON THE SOUTH SIDE. IT IS 12 FEET SOUTH LU2122'OF THE SOUTH CORNER OF THE LOOKOUT HOUSE, AND 2 FEET NORTH OF LU2122'A FLAGPOLE. LU2122' LU2122'REFERENCE MARK 1 IS A STANDARD DISK, STAMPED BACKBONE USGS LU2122'NO 1 1961, CEMENTED IN A DRILL HOLE IN OUTCROPPING BEDROCK LU2122'PROJECTING 4 FEET. IT IS 46 FEET SOUTHEAST OF THE SOUTH CORNER LU2122'OF THE LOOKOUT HOUSE AND 9 FEET LOWER THAN THE STATION MARK. LU2122' LU2122'REFERENCE MARK 2 IS A BRONZE, U.S. GEOLOGICAL REFERENCE MARK LU2122'DISK, STAMPED NO 2 1949, CEMENTED IN A DRILL HOLE IN BEDROCK LU2122'PROJECTING 1 INCH ON THE SOUTHWEST SIDE AND 10 INCHES ON THE LU2122'NORTHEAST SIDE. IT IS 4 FEET EAST OF THE EAST CORNER OF THE LU2122'LOOKOUT HOUSE AND 5 FEET LOWER THAN THE STATION MARK. LU2122' LU2122'USGS BM IS A COPPER BOLT AND WASHER IMBEDDED IN A TRIANGLE LU2122'IN THE ROOT OF A 2-FOOT PINE TREE, THE WASHER IS STAMPED USGS LU2122'BM. IT IS 19 FEET WEST OF THE WEST CORNER OF THE LOOKOUT HOUSE LU2122'AND 6 FEET LOWER THAN THE STATION MARK. LU2122' LU2122'THE AZIMUTH MARK IS A STANDARD DISK, STAMPED BACKBONE USGS 1961, LU2122'BRAZED TO THE TOP OF A 2-1/2 INCH IRON PIPE PROJECTING 10 INCHES. LU2122'IT IS 28 FEET WEST OF THE CENTERLINE OF THE GRAVELED ROAD, 20 LU2122'FEET SOUTH OF A 36-INCH FIR TREE WITH A TRIANGLE BLAZE ON LU2122'THE EAST SIDE AND ABOUT 20 FEET HIGHER THAN THE ROAD. LU2122' LU2122'A MEASUREMENT WAS MADE FROM THE CENTER OF THE CHIMNEY (THE LU2122'APPROXIMATE CENTER OF THE LOOKOUT HOUSE), IT IS 12.9 FEET HIGHER THAN LU2122'THE STATION MARK. LU2122' LU2122'OFFICE NOTE--BACKBONE (USGS) WAS SET IN 1953, STATION WAS NOT LU2122'OBSERVED ON OR FROM AND WAS VISITED ONLY BY THE BUILDING LU2122'PARTY.