This pier is located further downstream from GR1860 A I. It can be seen with a long camera lens from the top of Hoover dam, at the Arizona Base benchmark.
There is no public access to the canyon walls to get closer to these benchmarks.
From the NGS website: (
visit link)
"GR1848 DESIGNATION - A II
GR1848 PID - GR1848
GR1848 STATE/COUNTY- AZ/MOHAVE
GR1848 COUNTRY - US
GR1848 USGS QUAD - HOOVER DAM (1997)
GR1848
GR1848 *CURRENT SURVEY CONTROL
GR1848 ______________________________________________________________________
GR1848* NAD 83 POS- 36 00 53.06643(N) 114 44 15.51885(W) ADJUSTED
GR1848
GR1848_U.S. NATIONAL GRID SPATIAL ADDRESS: 11SQV0387987950(NAD 83)
GR1848
GR1848_MARKER: DS = TRIANGULATION STATION DISK
GR1848_SETTING: 0 = UNSPECIFIED SETTING
GR1848_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
GR1848_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
GR1848+SATELLITE: SATELLITE OBSERVATIONS - August 10, 2014
GR1848
GR1848 HISTORY - Date Condition Report By
GR1848 HISTORY - 1935 MONUMENTED BOR
GR1848 HISTORY - 1990 GOOD USPSQD
GR1848 HISTORY - 20140810 GOOD GEOCAC
GR1848
GR1848 STATION DESCRIPTION
GR1848
GR1848'DESCRIBED BY US BUREAU OF RECLAMATION 1935
GR1848'STATION IS A THREE-SIDED CONCRETE PIER ABOUT 5 FEET HIGH,
GR1848'LOCATED ON THE ARIZONA SIDE OF THE CANYON ABOUT 400 FEET
GR1848'DOWNSTREAM FROM END OF THE HOOVER DAM, WITH A STANDARD USC AND
GR1848'GS STATION MARK SET FLUSH WITH TOP OF THE PIER.
GR1848
GR1848 STATION RECOVERY (1990)
GR1848
GR1848'RECOVERY NOTE BY US POWER SQUADRON 1990 (MG)
GR1848'RECOVERED IN GOOD CONDITION.
GR1848
GR1848 STATION RECOVERY (2014)
GR1848
GR1848'RECOVERY NOTE BY GEOCACHING 2014 (LPC)
GR1848'RECOVERED IN GOOD CONDITION."