National Geodetic Survey, Retrieval Date = SEPTEMBER 28, 2002 KT1964 *********************************************************************** KT1964 DESIGNATION - POISON ROCK KT1964 PID - KT1964 KT1964 STATE/COUNTY- CA/MENDOCINO KT1964 USGS QUAD - THATCHER RIDGE (1994) KT1964 KT1964 *CURRENT SURVEY CONTROL KT1964 ___________________________________________________________________ KT1964* NAD 83(1992)- 39 43 43.83589(N) 123 01 51.17253(W) ADJUSTED KT1964* NAVD 88 - 1694.42 (+/-2cm) 5559.1 (feet) VERTCON KT1964 ___________________________________________________________________ KT1964 EPOCH DATE - 1991.35 KT1964 LAPLACE CORR- 10.35 (seconds) DEFLEC99 KT1964 GEOID HEIGHT- -28.18 (meters) GEOID99 KT1964 KT1964 HORZ ORDER - FIRST KT1964 VERT ORDER - THIRD ? (See Below) KT1964 KT1964.The horizontal coordinates were established by classical geodetic methods KT1964.and adjusted by the National Geodetic Survey in March 1994. KT1964.The horizontal coordinates are valid at the epoch date displayed above. KT1964.The epoch date for horizontal control is a decimal equivalence KT1964.of Year/Month/Day. KT1964 KT1964.The NAVD 88 height was computed by applying the VERTCON shift value to KT1964.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) KT1964.The vertical order pertains to the superseded datum. KT1964 KT1964.The Laplace correction was computed from DEFLEC99 derived deflections. KT1964 KT1964.The geoid height was determined by GEOID99. KT1964 KT1964; North East Units Scale Converg. KT1964;SPC CA 2 - 729,420.847 1,911,625.718 MT 0.99997781 -0 38 59.8 KT1964;SPC CA 2 - 2,393,108.23 6,271,725.38 sFT 0.99997781 -0 38 59.8 KT1964;SPC CA 1 - 544,438.374 1,911,616.893 MT 1.00007929 -0 40 26.7 KT1964;SPC CA 1 - 1,786,211.57 6,271,696.42 sFT 1.00007929 -0 40 26.7 KT1964;UTM 10 - 4,397,662.639 497,353.588 MT 0.99960009 -0 01 11.1 KT1964 KT1964: Primary Azimuth Mark Grid Az KT1964:SPC CA 2 - POISON ROCK AZ MK 323 11 55.4 KT1964:SPC CA 1 - POISON ROCK AZ MK 323 13 22.3 KT1964:UTM 10 - POISON ROCK AZ MK 322 34 06.7 KT1964 KT1964|---------------------------------------------------------------------| KT1964| PID Reference Object Distance Geod. Az | KT1964| dddmmss.s | KT1964| LU2031 HAMMERHORN LOOKOUT TOWER APPROX.31.1 KM 0124617.7 | KT1964| KT1957 ANTHONY PEAK LOOKOUT TOWER APPROX.14.2 KM 0233218.6 | KT1964| KT1954 BALL MTN LOOKOUT TOWER APPROX.30.8 KM 0425907.0 | KT1964| KT1966 POISON ROCK LOOKOUT TOWER 50.597 METERS 05542 | KT1964| DB6519 POISON ROCK RM 1 5.072 METERS 11203 | KT1964| DB6520 POISON ROCK RM 2 6.570 METERS 16142 | KT1964| KT1970 MOUNT SANHEDRIN LOOKOUT TOWER APPROX.24.3 KM 1932150.7 | KT1964| DB6518 POISON ROCK AZ MK 3223255.6 | KT1964|---------------------------------------------------------------------| KT1964 KT1964 SUPERSEDED SURVEY CONTROL KT1964 KT1964 NAD 83(1986)- 39 43 43.83095(N) 123 01 51.16180(W) AD(1984.00) 1 KT1964 NAD 27 - 39 43 44.27007(N) 123 01 47.14218(W) AD( ) 1 KT1964 NGVD 29 - 1693.40 (m) 5555.8 (f) LEVELING 3 KT1964 KT1964.Superseded values are not recommended for survey control. KT1964.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. KT1964.See file dsdata.txt to determine how the superseded data were derived. KT1964 KT1964_MARKER: Z = SEE DESCRIPTION KT1964_SETTING: 0 = UNSPECIFIED SETTING KT1964 KT1964 HISTORY - Date Condition Report By KT1964 HISTORY - 1942 MONUMENTED CGS KT1964 HISTORY - 1964 SEE DESCRIPTION CGS KT1964 HISTORY - 1966 SEE DESCRIPTION CGS KT1964 KT1964 STATION DESCRIPTION KT1964 KT1964'DESCRIBED BY COAST AND GEODETIC SURVEY 1942 (JCS) KT1964'THE STATION IS LOCATED ON POISON RIDGE, A HIGH BALD DIVIDE KT1964'LYING ABOUT 12 MILES ESE OF COVELO AND 8 MILES SSE OF THE COVELO KT1964'RANGER STATION, AND ON THE SAME HILL AS THE POISON ROCK LOOKOUT KT1964'TOWER. KT1964' KT1964'THE STATION MARK IS A BRONZE DISK SET IN A DRILL HOLE IN THE KT1964'TOP OF A PROJECTION OF ROCK OUTCROP WHICH IS ABOUT 8 FEET KT1964'HIGH AND ABOUT 150 FEET SW BY W OF THE LOOKOUT TOWER. IT IS KT1964'STAMPED POISON ROCK 1942. KT1964' KT1964'NO UNDERGROUND MARK WAS SET. KT1964' KT1964'REFERENCE MARK NO. 1 IS ESE AND 3 FEET LOWER THAN THE STATION. KT1964'IT IS A BRONZE DISK CEMENTED IN A DRILL HOLE IN OUTCROPPING KT1964'BEDROCK AND IS STAMPED POISON ROCK NO. 1 1942. KT1964' KT1964'REFERENCE MARK NO. 2 IS SSE AND 4-1/2 FEET LOWER THAN THE KT1964'STATION MARK. IT IS A BRONZE DISK CEMENTED IN A DRILL HOLE KT1964'IN OUTCROPPING BEDROCK AND IS STAMPED POISON ROCK NO. 2 1942. KT1964' KT1964'THE AZIMUTH MARK IS 2 MILES NW AND 25 FEET E OF THE ROAD TO KT1964'THE STATION. THIS POINT IS ABOUT 200 FEET S OF A FENCE LINE. KT1964'THE MARK CONSISTS OF A BRONZE DISK CEMENTED IN A DRILL HOLE KT1964'IN OUTCROPPING BEDROCK WHICH PROJECTS 12 FEET. THE MARK IS KT1964'ABOUT 12 INCHES BELOW THE HIGHEST POINT. IT IS STAMPED KT1964'POISON ROCK 1942. KT1964' KT1964'TO REACH THE STATION FROM THE POST OFFICE IN COVELO GO N ON THE KT1964'MAIN-TRAVELED HIGHWAY 1.5 MILES. TURN RIGHT, E, OFF THE MAIN KT1964'HIGHWAY AND GO EASTERLY ON A MAIN-TRAVELED ROAD 10.8 MILES TO KT1964'THE COVELO RANGER STATION ON THE RIGHT. NOTE--A KEY FOR KT1964'A LOCKED GATE MAY BE OBTAINED AT THE OFFICE OF THE RANGER KT1964'STATION. GO SW DOWN A LANE BETWEEN CORRALS, THEN ALONG A KT1964'RIVER FOR A TOTAL DISTANCE OF 0.4 MILE TO A BRIDGE. CROSS KT1964'THE BRIDGE AND FOLLOW THE RIVER NORTHERLY ALONG THE W SIDE KT1964'FOR 0.5 MILE TO FORKS. TURN BACK LEFT AND FOLLOW THE KT1964'MAIN-TRAVELED ROAD UP A VERY STEEP GRADE 6.9 MILES TO THE KT1964'TOP OF THE MAIN DIVIDE AND FORKS. KEEP THE LEFT FORK KT1964'SOUTHERLY 5.0 MILES TO THE POISON ROCK LOOKOUT TOWER AND KT1964'STATION. A DRIVE STATION. KT1964' KT1964'A 4-FOOT STAND WAS USED FOR OBSERVATIONS. KT1964 KT1964 STATION RECOVERY (1964) KT1964 KT1964'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (JJL) KT1964'ALL MARKS WERE RECOVERED AS DESCRIBED AND FOUND IN GOOD KT1964'CONDITION. THE POISON ROCK LOOKOUT TOWER IS NOW ABANDONED AND KT1964'IS IN THE PROCESS OF BEING REMOVED. A NEW TO REACH DESCRIPTION KT1964'FOLLOWS-- KT1964' KT1964'TO REACH THE STATION FROM THE POST OFFICE IN COVELO, GO EAST KT1964'FOR 0.05 MILE TO A CROSS STREET. TURN LEFT AND GO NORTH KT1964'FOR 1.5 MILES TO A CROSSROAD AND SIGN EEL RIVER RANGER STATION-11. KT1964'TURN RIGHT, AS PER SIGN, AND GO EAST AND SOUTH FOR 10.8 MILES KT1964'TO THE EEL RIVER RANGER STATION ON THE RIGHT, WEST, SIDE OF KT1964'THE ROAD. BEAR RIGHT, PASS BETWEEN THE RANGER STATION KT1964'BUILDINGS, AND GO SOUTHWEST FOR 0.15 MILE TO A Y-FORK. TAKE THE KT1964'LEFT FORK AND GO SOUTH, WEST, AND NORTHWEST FOR 0.6 MILE KT1964'TO A REVERSE Y-FORK AND SIGN POISON ROCK 12. TURN KT1964'SHARP LEFT, AS PER SIGN, AND GO SOUTHEAST FOR 0.4 MILE TO A KT1964'Y-FORK. TAKE THE RIGHT FORK AND GO SOUTHERLY FOR 5.9 KT1964'MILES TO A CROSSROAD. CONTINUE AHEAD, SOUTH, FOR 2.1 MILES KT1964'TO A Y-FORK. TAKE THE LEFT FORK, SOUTH, FOR 1.5 MILES TO KT1964'THE AZIMUTH MARK ON THE LEFT, EAST, SIDE OF THE ROAD. CONTINUE KT1964'AHEAD, SOUTH AND SOUTHEAST, FOR 1.3 MILES TO A Y-FORK. TAKE KT1964'THE LEFT FORK, SOUTHEAST, FOR 0.4 MILE TO A Y-FORK AND KT1964'SIGN POISON ROCK 1/4. TAKE THE LEFT FORK, AS PER SIGN, AND KT1964'GO SOUTHEAST FOR 0.6 MILE TO A Y-FORK. TAKE THE LEFT KT1964'FORK AND GO EAST AND NORTHWEST FOR ABOUT 100 YARDS TO KT1964'THE TOP OF THE MOUNTAIN AND THE STATION. KT1964' KT1964'IT IS 16.63 FEET OR 5.069 METERS BETWEEN THE REFERENCE MARKS. KT1964 KT1964 STATION RECOVERY (1966) KT1964 KT1964'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1966 (CAA) KT1964'STATION MARK, REFERENCE MARKS 1 AND 2 AND THE AZIMUTH MARK KT1964'WERE RECOVERED AS DESCRIBED BY J.J.L. THE 1964 TO REACH KT1964'IS ADEQUATE. KT1964' KT1964'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--12-1/2 MILES KT1964'SOUTHEAST OF COVELO