National Geodetic Survey, Retrieval Date = NOVEMBER 2, 2004 JS3991 *********************************************************************** JS3991 DESIGNATION - BLUE MOUNTAIN LOOKOUT HOUSE JS3991 PID - JS3991 JS3991 STATE/COUNTY- CA/CALAVERAS JS3991 USGS QUAD - DORRINGTON (1979) JS3991 JS3991 *CURRENT SURVEY CONTROL JS3991 ___________________________________________________________________ JS3991* NAD 83(1992)- 38 20 31.31235(N) 120 21 53.70680(W) ADJUSTED JS3991* NAVD 88 - 1850.4 (meters) 6071. (feet) VERTCON JS3991 ___________________________________________________________________ JS3991 EPOCH DATE - 1991.35 JS3991 LAPLACE CORR- 14.79 (seconds) DEFLEC99 JS3991 GEOID HEIGHT- -26.11 (meters) GEOID03 JS3991 JS3991 HORZ ORDER - THIRD JS3991 JS3991.The horizontal coordinates were established by classical geodetic methods JS3991.and adjusted by the National Geodetic Survey in March 1994. JS3991.The horizontal coordinates are valid at the epoch date displayed above. JS3991.The epoch date for horizontal control is a decimal equivalence JS3991.of Year/Month/Day. JS3991 JS3991.The NAVD 88 height was computed by applying the VERTCON shift value to JS3991.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) JS3991 JS3991.The Laplace correction was computed from DEFLEC99 derived deflections. JS3991 JS3991.The geoid height was determined by GEOID03. JS3991 JS3991; North East Units Scale Factor Converg. JS3991;SPC CA 3 - 704,445.038 2,011,809.006 MT 0.99998229 +0 04 57.7 JS3991;SPC CA 3 - 2,311,166.76 6,600,410.05 sFT 0.99998229 +0 04 57.7 JS3991;UTM 10 - 4,247,051.710 730,293.344 MT 1.00025319 +1 38 07.5 JS3991 JS3991! - Elev Factor x Scale Factor = Combined Factor JS3991!SPC CA 3 - 0.99971383 x 0.99998229 = 0.99969613 JS3991!UTM 10 - 0.99971383 x 1.00025319 = 0.99996695 JS3991 JS3991: Primary Azimuth Mark Grid Az JS3991:SPC CA 3 - DEVILS NOSE 340 02 50.0 JS3991:UTM 10 - DEVILS NOSE 338 29 40.2 JS3991 JS3991|---------------------------------------------------------------------| JS3991| PID Reference Object Distance Geod. Az | JS3991| dddmmss.s | JS3991| DA8777 BLUE MTN RM 1 6.568 METERS 06233 | JS3991| DA8778 BLUE MTN RM 2 16.962 METERS 28515 | JS3991| JS3994 DEVILS NOSE APPROX.14.3 KM 3400747.7 | JS3991|---------------------------------------------------------------------| JS3991 JS3991 SUPERSEDED SURVEY CONTROL JS3991 JS3991 NAD 83(1986)- 38 20 31.28846(N) 120 21 53.70046(W) AD(1984.00) 3 JS3991 NAD 27 - 38 20 31.60218(N) 120 21 50.00280(W) AD( ) 3 JS3991 NGVD 29 (07/19/86) 1849.5 (m) 6068. (f) VERT ANG JS3991 JS3991.Superseded values are not recommended for survey control. JS3991.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. JS3991.See file dsdata.txt to determine how the superseded data were derived. JS3991 JS3991_U.S. NATIONAL GRID SPATIAL ADDRESS: 10SGH3029347052(NAD 83) JS3991_MARKER: 73 = LOOKOUT HOUSE JS3991 JS3991 HISTORY - Date Condition Report By JS3991 HISTORY - 1946 FIRST OBSERVED USGS JS3991 HISTORY - 1949 GOOD USGS JS3991 HISTORY - 1956 GOOD USGS JS3991 HISTORY - 1972 GOOD CADT JS3991 HISTORY - 1974 SEE DESCRIPTION USGS JS3991 JS3991 STATION DESCRIPTION JS3991 JS3991'DESCRIBED BY US GEOLOGICAL SURVEY 1946 JS3991'LOCATED 4.0 MI S. AND 9.0 MI E. OF WEST POINT. ON PROMINENT JS3991'MOUNTAIN OF THE SAME NAME. A U.S. FOREST SERVICE LOOKOUT KNOWN JS3991'AS BLUE MTN LOOKOUT. JS3991' JS3991'STATION MARK--CENTER OF USFS LOH. JS3991' JS3991'RM 1--STANDARD RM TABLET STAMPED---BLUE MTN NO 1---, CEMENTED IN JS3991'BEDROCK. JS3991' JS3991'RM 2--USFS BRONZE TABLET JS3991'STAMPED---BLUE MTN VABM ELEV 6067 T6N R15E SEC 30 1938---, CEMENTED JS3991'IN BEDROCK. JS3991 JS3991 STATION RECOVERY (1949) JS3991 JS3991'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1949 JS3991'RECOVERED AS DESCRIBED. ALL MARKS IN GOOD CONDITION. JS3991 JS3991 STATION RECOVERY (1956) JS3991 JS3991'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1956 JS3991'DESCRIBED BY USGS IN 1946. BLUE MTN USFS WAS SEARCHED FOR AND JS3991'NOT FOUND. A NEW RM WAS SET. JS3991' JS3991'NEW TO REACH FOLLOWS--TO REACH FROM ARNOLD POST OFFICE, DRIVE JS3991'0.25 MI E. ALONG STATE HWY. 4 TO RD. FORKS. TAKE LEFT FORK 1.7 MI JS3991'ALONG RD. THROUGH WHITE PINES MILL GOING AROUND NORTH END OF POND JS3991'TO RD. FORKS AT POWDER MAGAZINE. TAKE LEFT FORK 2.05 MI TO X-RDS. JS3991'AT SADDLE, CONTINUE STRAIGHT AHEAD 6.25 MI TO RD. FORKS. TAKE JS3991'LEFT FORK 0.5 MI TO RD. FORKS. TAKE RIGHT FORK FOLLOWING FS SIGNS JS3991'TO BLUE MTN LOH. JS3991' JS3991'RM 2--STANDARD RM TABLET STAMPED---NO 2 1956---, CEMENTED IN TOP OF JS3991'SOLID ROCK. JS3991 JS3991 STATION RECOVERY (1972) JS3991 JS3991'RECOVERY NOTE BY CALTRANS 1972 (RMB) JS3991'THE STATION IS THE CENTER OF THE TOP OF THE CALIF DIVISION OF JS3991'FORESTRY LOOKOUT HOUSE KNOWN AS BLUE MOUNTAIN LOOKOUT LOCATED IN JS3991'SECTION, T5N, R14E MT. DIABLO MERIDIAN. THE STRUCTURE CONSISTS OF JS3991'A SQUARE LOOKOUT HOUSE ON TOP OF A CONCRETE BLOCK STRUCTURE WITH JS3991'VERTICAL SIDES. THE LOOKOUT HOUSE IS PAINTED GREEN. JS3991 JS3991 STATION RECOVERY (1974) JS3991 JS3991'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1974 JS3991'RECOVERED AS REDESCRIBED. POSITION COMPUTED FROM JS3991'TIE TO 1972 STATION BLUE MTN CDH. STATION MARK WAS DESTROYED. A JS3991'NEW LOH WAS BUILT IN 1966 AND INTERSECTED BY CDH IN 1972. THE JS3991'TOP WAS LEVELED OFF.