National Geodetic Survey, Retrieval Date = SEPTEMBER 29, 2002 LU2173 *********************************************************************** LU2173 DESIGNATION - BLACK ROCK LOOKOUT TOWER LU2173 PID - LU2173 LU2173 STATE/COUNTY- CA/TRINITY LU2173 USGS QUAD - LU2173 LU2173 *CURRENT SURVEY CONTROL LU2173 ___________________________________________________________________ LU2173* NAD 83(1992)- 40 12 16.41981(N) 123 00 34.60094(W) ADJUSTED LU2173* NAVD 88 - LU2173 ___________________________________________________________________ LU2173 EPOCH DATE - 1991.35 LU2173 LAPLACE CORR- 6.16 (seconds) DEFLEC99 LU2173 GEOID HEIGHT- -27.49 (meters) GEOID99 LU2173 LU2173 HORZ ORDER - THIRD LU2173 LU2173.The horizontal coordinates were established by classical geodetic methods LU2173.and adjusted by the National Geodetic Survey in March 1994. LU2173.The horizontal coordinates are valid at the epoch date displayed above. LU2173.The epoch date for horizontal control is a decimal equivalence LU2173.of Year/Month/Day. LU2173 LU2173 LU2173.The Laplace correction was computed from DEFLEC99 derived deflections. LU2173 LU2173.The geoid height was determined by GEOID99. LU2173 LU2173; North East Units Scale Converg. LU2173;SPC CA 1 - 597,235.078 1,914,048.997 MT 0.99995476 -0 39 36.6 LU2173;SPC CA 1 - 1,959,428.75 6,279,675.75 sFT 0.99995476 -0 39 36.6 LU2173;UTM 10 - 4,450,461.942 499,182.030 MT 0.99960001 -0 00 22.3 LU2173 LU2173 SUPERSEDED SURVEY CONTROL LU2173 LU2173 NAD 83(1986)- 40 12 16.41370(N) 123 00 34.60549(W) AD(1984.00) 4 LU2173 NAD 27 - 40 12 16.86930(N) 123 00 30.54253(W) AD( ) 3 LU2173 LU2173.Superseded values are not recommended for survey control. LU2173.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. LU2173.See file dsdata.txt to determine how the superseded data were derived. LU2173 LU2173 HISTORY - Date Condition Report By LU2173 HISTORY - 1942 MONUMENTED CGS LU2173 HISTORY - 1954 SEE DESCRIPTION USGS LU2173 HISTORY - 1964 SEE DESCRIPTION CGS LU2173 LU2173 STATION DESCRIPTION LU2173 LU2173'DESCRIBED BY COAST AND GEODETIC SURVEY 1942 (JCS) LU2173'THIS UNOCCUPIED INTERSECTION STATION IS A PERMANENT LOOKOUT LU2173'STATION, LOCATED ON THE SUMMIT OF BLACK ROCK MOUNTAIN WHICH LU2173'IS IN THE TRINITY NATIONAL FOREST AND ABOUT 32 MILES, AIR LINE, LU2173'N BY E FROM COVELO, CALIFORNIA. THE STATION SIGHT WAS NOT VISITED LU2173'BY THIS PARTY. THE CENTER OF THE STRUCTURE WAS CUT IN AS AN LU2173'INTERSECTION STATION. LU2173 LU2173 STATION RECOVERY (1954) LU2173 LU2173'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1954 LU2173'STATION AS DESCRIBED BY R.M. WILSON (1929) WAS TORN DOWN IN LU2173'1935 AND A NEW LOOKOUT TOWER WAS BUILT ABOUT 75 FT. W OF THE LU2173'ORIGINAL TOWER. LU2173' LU2173'THE REFERENCE MARK WAS RECOVERED BUT THE DRILL HOLE WAS NOT LU2173'FOUND (PROBABLY DESTROYED DURING CONSTRUCTION OF THE NEW LOOKOUT). LU2173' LU2173'REVISED DESCRIPTION-- LU2173' LU2173'ABOUT 12 MI. (AIRLINE) SW OF PLATINA, AND ABOUT 2 MI. W OF LU2173'NORTH YOLLA BOLLY MOUNTAIN. ON THE SUMMIT OF BLACK ROCK LU2173'MOUNTAIN. LU2173' LU2173'ROUTE TO STATION-- LU2173' LU2173'FROM THE POST OFFICE AT RED BLUFF, GO N 1.5 MI. ON HIGHWAY LU2173'99 TO STATE HIGHWAY 36, TURN LEFT ON HIGHWAY 36 AND GO ABOUT LU2173'50 MI. TO HARRISON GULCH RANGER STATION, TAKE ROAD TO LEFT TO LU2173'WHITE ROCK GUARD STATION (ABOUT 23 MI.), CONTINUE PAST WHITE LU2173'ROCK GUARD STATION FOR ABOUT 3 MI. TO GRASSHOPPER CAMP AND END LU2173'OF TRUCK TRAVEL. TAKE TRAIL (VIA STUART GAP) TO SADDLE BETWEEN LU2173'NORTH YOLLA BOLLY MTN. AND BLACK ROCK MTN, TURN RIGHT (W) IN LU2173'SADDLE AND FOLLOW TRAIL ABOUT 2 MI. TO THE SUMMIT AND THE LU2173'STATION. A 4 HOUR PACK. STATION IS CENTER OF THE LOOKOUT LU2173'STATION. LU2173' LU2173'REFERENCE MARK IS A STANDARD U.S.G.S. REFERENCE TABLET (UNSTAMPED) LU2173'APPROXIMATELY 100 FT. IN APPROXIMATELY AZIMUTH 85 DEG, WITH ITS LU2173'ARROW POINTING TO THE STATION. LU2173 LU2173 STATION RECOVERY (1964) LU2173 LU2173'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (JJL) LU2173'THE STATION WAS RECOVERED AS DESCRIBED AND FOUND IN GOOD CONDITION.