DATASHEETS Data Sheet Retrieval National Geodetic Survey, Retrieval Date = APRIL 6, 2020 GR1870 *********************************************************************** GR1870 DESIGNATION - RIVER MOUNTAIN GR1870 PID - GR1870 GR1870 STATE/COUNTY- NV/CLARK GR1870 COUNTRY - US GR1870 USGS QUAD - BOULDER BEACH (2018) GR1870 GR1870 *CURRENT SURVEY CONTROL GR1870 ______________________________________________________________________ GR1870* NAD 83(1994) POSITION- 36 01 03.29802(N) 114 51 31.84549(W) ADJUSTED GR1870* NAVD 88 ORTHO HEIGHT - 1155.7 (meters) 3792. (feet) VERTCON GR1870 ______________________________________________________________________ GR1870 GEOID HEIGHT - -28.176 (meters) GEOID18 GR1870 LAPLACE CORR - 0.06 (seconds) DEFLEC18 GR1870 HORZ ORDER - FIRST GR1870 GR1870.The horizontal coordinates were established by classical geodetic methods GR1870.and adjusted by the National Geodetic Survey in June 1998. GR1870. GR1870.The NAVD 88 height was computed by applying the VERTCON shift value to GR1870.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) GR1870 GR1870.Significant digits in the geoid height do not necessarily reflect accuracy. GR1870.GEOID18 height accuracy estimate available here. GR1870 GR1870.Click photographs - Photos may exist for this station. GR1870 GR1870.The Laplace correction was computed from DEFLEC18 derived deflections. GR1870 GR1870. The following values were computed from the NAD 83(1994) position. GR1870 GR1870; North East Units Scale Factor Converg. GR1870;SPC NV E - 8,140,864.032 265,301.960 MT 0.99995253 +0 25 33.7 GR1870;SPC NV E -26,708,818.08 870,411.51 sFT 0.99995253 +0 25 33.7 GR1870;UTM 11 - 3,988,019.230 692,948.250 MT 1.00005875 +1 15 34.1 GR1870 GR1870! - Elev Factor x Scale Factor = Combined Factor GR1870!SPC NV E - 0.99982307 x 0.99995253 = 0.99977560 GR1870!UTM 11 - 0.99982307 x 1.00005875 = 0.99988181 GR1870 GR1870: Primary Azimuth Mark Grid Az GR1870:SPC NV E - HEM 044 24 02.5 GR1870:UTM 11 - HEM 043 34 02.1 GR1870 GR1870_U.S. NATIONAL GRID SPATIAL ADDRESS: 11SPV9294888019(NAD 83) GR1870 GR1870|---------------------------------------------------------------------| GR1870| PID Reference Object Distance Geod. Az | GR1870| dddmmss.s | GR1870| GR1875 HEM APPROX. 7.5 KM 0444936.2 | GR1870| GR1872 BABCOX WILCOX FABRICTNG PLT TK APPROX. 9.2 KM 0904221.3 | GR1870| CC6362 RIVER MOUNTAIN RM 1 4.611 METERS 19014 | GR1870| CC6361 RIVER MOUNTAIN AZ MK 2383832.8 | GR1870| CC6363 RIVER MOUNTAIN RM 2 4.833 METERS 27826 | GR1870| GR1876 HENDERSON BASIC MAGN PLT C STK APPROX.12.7 KM 2832352.0 | GR1870|---------------------------------------------------------------------| GR1870 GR1870 SUPERSEDED SURVEY CONTROL GR1870 GR1870 NAD 83(1992)- 36 01 03.29799(N) 114 51 31.84601(W) AD( ) 1 GR1870 NAD 83(1992)- 36 01 03.29785(N) 114 51 31.84560(W) AD( ) 1 GR1870 NAD 83(1986)- 36 01 03.28863(N) 114 51 31.83159(W) AD( ) 1 GR1870 NAD 27 - 36 01 03.36300(N) 114 51 28.88100(W) AD( ) 1 GR1870 NGVD 29 (07/19/86) 1155.0 (m) 3789. (f) VERT ANG GR1870 GR1870.Superseded values are not recommended for survey control. GR1870 GR1870.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. GR1870.See file dsdata.pdf to determine how the superseded data were derived. GR1870 GR1870_MARKER: DS = TRIANGULATION STATION DISK GR1870_SETTING: 80 = SET IN A BOULDER GR1870_STAMPING: RIVER MTN 1934 GR1870_MARK LOGO: CGS GR1870_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO GR1870+STABILITY: SURFACE MOTION GR1870 GR1870 HISTORY - Date Condition Report By GR1870 HISTORY - 1934 MONUMENTED CGS GR1870 HISTORY - 1935 GOOD CGS GR1870 HISTORY - 1947 GOOD CGS GR1870 HISTORY - 1950 GOOD USGS GR1870 HISTORY - 1951 GOOD USGS GR1870 HISTORY - 1954 GOOD CGS GR1870 HISTORY - 1957 GOOD USGS GR1870 HISTORY - 1963 GOOD CGS GR1870 HISTORY - 1970 GOOD USGS GR1870 HISTORY - 1972 GOOD LAWPC GR1870 GR1870 STATION DESCRIPTION GR1870 GR1870'DESCRIBED BY COAST AND GEODETIC SURVEY 1934 (CP) GR1870'STATION IS ON THE HIGHEST POINT OF THE RANGE THAT LIES ABOUT 25 GR1870'MILES E OF LAS VEGAS, 3 MILES NW OF BOULDER CITY AND ABOUT 7 GR1870'MILES W OF BOULDER DAM. IT IS ON THE SOUTHERNMOST ONE OF THREE GR1870'POINTS OF ABOUT THE SAME ELEVATION. THE POINT IS ROCKY AND HAS GR1870'A RIDGE RUNNING N FROM THE STATION. GR1870' GR1870'STATION MARK IS A STANDARD BRONZE DISK WEDGED IN A DRILL HOLE GR1870'IN A BOULDER. GR1870' GR1870'REFERENCE MARKS ARE STANDARD BRONZE DISKS SET IN OUTCROPPING GR1870'BEDROCK. GR1870' GR1870'BEST REACHED FROM LAS VEGAS AS FOLLOWS--FROM CORNER OF 5TH AND GR1870'FREMONT STREETS, GO E ON THE BOULDER CITY HIGHWAY 9.8 MILES, GR1870'TURN LEFT ON GRADED ROAD PAST THE MIDWAY TAVERN FOR 0.3 MILE, GR1870'STRAIGHT AHEAD 0.6 MILE, TURN RIGHT ON OLD GRADED ROAD, GO GR1870'0.9 MILE, TURN LEFT ON OLD DESERT ROAD AND GO 4.3 MILES (ROAD GR1870'MEETS TELEPHONE LINE AT W END OF DRAW HERE). CONTINUE THROUGH GR1870'DRAW 1.2 MILES, TURN LEFT OFF ROAD AND GO UP WASH 0.7 MILE. GR1870'LEAVE WASH AND GO UP RIDGE TOWARDS PEAK 0.7 MILE, TO BASE OF GR1870'MOUNTAIN. FROM THIS POINT THE STATION LIES ABOUT 0.5 MILE GR1870'E, A FORTY-MINUTE PACK. THE STATION WAS PLACED IN THE SAME GR1870'PLACE AS THE OLD POST MARKING THE U.S.B.R. AND M.W.D. GR1870'STATION. GR1870 GR1870 STATION RECOVERY (1935) GR1870 GR1870'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (EBL) GR1870'STATION WAS FOUND AS PREVIOUSLY DESCRIBED BY CHAS. PIERCE AND GR1870'FOUND TO BE IN GOOD CONDITION. GR1870' GR1870'NOTE--POSSIBLE ERROR OF 5 MINUTES ON ONE SIDE OF R.M. NO. 1. GR1870 GR1870 STATION RECOVERY (1947) GR1870 GR1870'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947 (CL) GR1870'THE STATION IS LOCATED ON THE HIGHEST POINT OF THE RANGE OF GR1870'MOUNTAINS ABOUT 25 MILES, AIRLINE, SOUTHEAST OF LAS VEGAS, ABOUT GR1870'3 MILES NORTHWEST OF BOULDER CITY, AND 7 MILES WEST OF BOULDER GR1870'DAM. IT IS ON THE SOUTHERNMOST ONE OF THREE POINTS OF ABOUT GR1870'THE SAME ELEVATION. THERE IS A LARGE POWER LINE ABOUT 1/2 GR1870'MILE TO THE SOUTH AND ABOUT 500 FEET LOWER. GR1870' GR1870'THE STATION MARK WAS RECOVERED AND FOUND TO BE IN GOOD CONDITION. GR1870'IT IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN A BOULDER GR1870'WHICH IS ABOUT 1-1/2 FOOT IN DIAMETER AND PROJECTS 6 INCHES GR1870'ABOVE THE GROUND. IT IS ON THE HIGHEST POINT OF THE PEAK AND GR1870'IS STAMPED RIVER MTN 1934. GR1870' GR1870'REFERENCE MARK NO. 1 WAS RECOVERED AS DESCRIBED AND FOUND TO GR1870'BE IN GOOD CONDITION. IT IS A STANDARD DISK CEMENTED IN A DRILL GR1870'HOLE IN OUTCROPPING BEDROCK WHICH PROJECTS ABOUT 10 INCHES GR1870'AND IS 2-1/2 FEET SQUARE. IT IS THE SAME ELEVATION AS THE GR1870'STATION MARK. IS STAMPED RIVER MTN NO 1 1934. GR1870' GR1870'REFERENCE MARK NO. 2 WAS RECOVERED AS DESCRIBED AND FOUND TO GR1870'BE IN GOOD CONDITION. IT IS A STANDARD DISK CEMENTED IN A DRILL GR1870'HOLE IN BEDROCK WHICH IS APPROX. 6 FEET SOUTH OF A ROCK RIDGE GR1870'AND 4 FEET LOWER THAN THE STATION MARK. THE DISK IS STAMPED GR1870'RIVER MTN NO 2 1934. GR1870' GR1870'A NEW AZIMUTH MARK WAS PLACED 0.4 MILE SOUTHWEST OF THE STATION GR1870'AT THE END OF TRUCK TRAVEL. IT IS A STANDARD DISK CEMENTED GR1870'IN A DRILL HOLE IN BEDROCK WHICH IS FLUSH WITH THE SURFACE GR1870'OF THE GROUND. IT IS 8 FEET EAST-NORTHEAST OF A LARGE ROCK GR1870'CAIRN, 25 FEET SOUTH-SOUTHEAST OF A LARGE BOULDER, AND IS GR1870'STAMPED RIVER MTN 1947. GR1870' GR1870'THE ROUTE TO THE STATION BY THE ORIGINAL DESCRIPTION IS NOW GR1870'OBSOLETE. IT IS NOW REACHED BY THE FOLLOWING--FROM THE GR1870'INTERSECTION OF MAIN STREET AND FREMONT STREET IN LAS VEGAS GR1870'GO SOUTHEAST ON FREMONT STREET (U.S. HIGHWAY NO. 466) FOR 14.5 GR1870'MILES TO A DIRT TRACK ROAD LEADING LEFT ALONG A POWER LINE. GR1870'TURN LEFT AND GO 2.6 MILES TO A POINT WHERE ANOTHER TRACK GR1870'COMES IN FROM THE RIGHT AND THE MAIN ROAD TURNS LEFT, GR1870'NORTHEAST. TURN LEFT AND GO 0.45 MILE TO ANOTHER POWER LINE. GR1870'CONTINUE STRAIGHT AHEAD ON THE MAIN TRAVELED ROAD WHICH GR1870'BENDS AROUND THE POINT OF A RIDGE AND GO 1.1 MILES ALONG A GR1870'TELEPHONE LINE. TURN LEFT ALONG ANOTHER POWER LINE AND GO GR1870'1.7 MILES. TURN RIGHT AND GO 0.4 MILE. TURN LEFT OFF GR1870'THE ROAD AND GO 0.3 MILE ON TOP OF A SMALL BENCH AT THE BASE GR1870'OF A RIDGE AND THE END OF TRUCK TRAVEL. FROM HERE PACK GR1870'EAST-NORTHEAST UP THE RIDGE TO THE HIGHEST POINT AND STATION. GR1870'A 45 MINUTE BACK PACK. GR1870 GR1870 STATION RECOVERY (1950) GR1870 GR1870'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1950 GR1870'RECOVERED AS DESCRIBED BY NGS. ALL MARKS IN GOOD CONDITION. GR1870 GR1870 STATION RECOVERY (1951) GR1870 GR1870'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1951 GR1870'RECOVERED IN GOOD CONDITION. GR1870 GR1870 STATION RECOVERY (1954) GR1870 GR1870'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1954 (LSB) GR1870'THE STATION MARK AND REFERENCE MARKS 1 AND 2 WERE RECOVERED GR1870'IN GOOD CONDITION. A DIFFERENCE IN DISTANCE TO REFERENCE GR1870'MARK 1 WAS NOTED. THE ORIGINAL ROUTE TO THE STATION IS NOW GR1870'OBSOLETE, SO A NEW DESCRIPTION FOLLOWS. GR1870' GR1870'THE STATION IS ON THE HIGHEST POINT AND SOUTHERNMOST ONE OF GR1870'THREE POINTS. IT IS LOCATED ABOUT 25 MILES EAST OF LAS VEGAS, GR1870'7 MILES WEST OF BOULDER (HOOVER) DAM, AND 3 MILES NORTHWEST OF GR1870'BOULDER CITY. GR1870' GR1870'TO REACH FROM THE JUNCTION OF U.S. HIGHWAYS 93, 95 AND 466 GR1870'(ABOUT 4 MILES WEST OF BOULDER CITY), GO NORTH ON U.S. HIGHWAY GR1870'93, 95 AND 466 FOR 2.2 MILES TO A SIDE ROAD RIGHT (DIRT). TURN GR1870'RIGHT, EAST, AND GO 0.1 MILE TO A FORK. TAKE THE LEFT FORK GR1870'AND GO 1.8 MILE TO A CROSSROAD. CONTINUE STRAIGHT AHEAD FOR GR1870'1.5 MILE TO A REVERSE Y. CONTINUE STRAIGHT AHEAD FOR 1.6 GR1870'MILES TO A FORK. TAKE THE LEFT FORK AND GO 0.4 MILE TO A SIDE GR1870'ROAD RIGHT. TURN RIGHT, SOUTH, AND GO 0.3 MILE TO A FORK. GR1870'TAKE THE LEFT FORK AND GO UP THE WASH FOR 0.8 MILE TO THE END GR1870'OF THE ROAD AND THE END OF TRUCK TRAVEL. PACK NORTH AND GR1870'WEST TO THE SOUTHERNMOST POINT AND THE STATION. THIS IS A GR1870'20-MINUTE PACK. GR1870' GR1870'THE STATION MARK, A STANDARD DISK STAMPED RIVER MTN 1934, IS GR1870'SET IN A DRILL HOLE IN OUTCROPPING BEDROCK WHICH PROJECTS GR1870'6 INCHES ABOVE THE GROUND. GR1870' GR1870'REFERENCE MARK 1, A STANDARD DISK STAMPED RIVER MTN NO 1 1934, GR1870'IS SET IN A DRILL HOLE IN OUTCROPPING BEDROCK WHICH PROJECTS 6 GR1870'INCHES ABOVE THE GROUND. IT IS ABOUT THE SAME ELEVATION AS GR1870'THE STATION. GR1870' GR1870'REFERENCE MARK 2, A STANDARD DISK STAMPED RIVER MTN NO 2 1934, GR1870'IS SET IN A DRILL HOLE IN OUTCROPPING BEDROCK WHICH IS FLUSH GR1870'WITH THE GROUND. IT IS ABOUT 3 FEET LOWER THAN THE STATION. GR1870 GR1870 STATION RECOVERY (1957) GR1870 GR1870'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1957 GR1870'RECOVERED AS DESCRIBED BY NGS. ALL MARKS IN GOOD CONDITION. GR1870 GR1870 STATION RECOVERY (1963) GR1870 GR1870'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1963 (HEM) GR1870'STATION AND REFERENCE MARKS RECOVERED AS DESCRIBED IN GOOD GR1870'CONDITION. GR1870 GR1870 STATION RECOVERY (1970) GR1870 GR1870'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1970 GR1870'RECOVERED AS DESCRIBED BY NGS. RMS AGREE WITH NGS. GR1870 GR1870 STATION RECOVERY (1972) GR1870 GR1870'RECOVERY NOTE BY LA WTR AND PWR COMM 1972 (MSB) GR1870'RIVER MTN-1934-RECOVERED IN GOOD CONDITION. GR1870' GR1870'FOUND BY HELICOPTER.