This benchmark can be seen with a long camera lens on the Arizona side of Boulder Canyon. It is the furthest of the concrete pier benchmarks downstream from Hoover dam.
There is no public access to this area.
From the NGS Datasheet: (
visit link)
"GR1856 DESIGNATION - A III
GR1856 PID - GR1856
GR1856 STATE/COUNTY- AZ/MOHAVE
GR1856 COUNTRY - US
GR1856 USGS QUAD - HOOVER DAM (1997)
GR1856
GR1856 *CURRENT SURVEY CONTROL
GR1856 ______________________________________________________________________
GR1856* NAD 83 POS- 36 00 48.71058(N) 114 44 18.75370(W) ADJUSTED
GR1856
GR1856_U.S. NATIONAL GRID SPATIAL ADDRESS: 11SQV0380187814(NAD 83)
GR1856
GR1856_MARKER: DS = TRIANGULATION STATION DISK
GR1856_SETTING: 0 = UNSPECIFIED SETTING
GR1856_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
GR1856_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
GR1856+SATELLITE: SATELLITE OBSERVATIONS - August 10, 2014
GR1856
GR1856 HISTORY - Date Condition Report By
GR1856 HISTORY - 1935 MONUMENTED BOR
GR1856 HISTORY - 1990 GOOD USPSQD
GR1856 HISTORY - 20140810 GOOD GEOCAC
GR1856
GR1856 STATION DESCRIPTION
GR1856
GR1856'DESCRIBED BY US BUREAU OF RECLAMATION 1935
GR1856'STATION IS A THREE-SIDED CONCRETE PIER ABOUT 5 FEET HIGH,
GR1856'LOCATED ON THE ARIZONA SIDE OF THE CANYON ABOUT 900 FEET
GR1856'DOWNSTREAM FROM THE END OF THE HOOVER DAM, WITH A USC AND GS
GR1856'STATION MARK SET FLUSH WITH THE TOP OF THE PIER.
GR1856
GR1856 STATION RECOVERY (1990)
GR1856
GR1856'RECOVERY NOTE BY US POWER SQUADRON 1990 (MG)
GR1856'RECOVERED IN GOOD CONDITION.
GR1856
GR1856 STATION RECOVERY (2014)
GR1856
GR1856'RECOVERY NOTE BY GEOCACHING 2014 (LPC)
GR1856'RECOVERED IN GOOD CONDITION."