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Details for Benchmark: RB1412

N 45° 56.117 W 119° 19.535 (NAD 83)

Altitude: 338

Coordinates may not be exact. Altitude is VERTCON and location is ADJUSTED. (more info)

Location:
In BENTON county, WA View Original Datasheet
Designation:
TRANS
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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Found as described.

[Photos:]
photoRB1412 TRANS (CLOSEUP) BENTON county, WA
photoRB1412 TRANS (VIEW W) BENTON county, WA
Looking across the Columbia river towards Dam.

Reference Marks 1 and 2 also located

Photo: http://www.flickr.com/photos/gpaulson/tags/RB1412/

Documented History (by the NGS)

01/01/1942 by USE (MONUMENTED)
DESCRIBED BY US ENGINEERS 1942 (ANS) STATION IS ABOUT 2.0 MILES E OF PLYMOUTH, 3.0 MILES NE OF UMATILLA, ON A ROCK POINT THAT PROTRUDES OUT INTO THE COLUMBIA RIVER. THE STATION IS ABOUT 70 FEET ABOVE LOW WATER. STATION, STAMPED TRANS 1941, IS A STANDARD U.S.E. BRONZE DISK CEMENTED IN A DRILL HOLE IN OUTCROPPING ROCK. IT IS 8.0 FEET N OF S EDGE OF CLIFF, AND ABOUT 150 YARDS NE OF A TALL STEEL TOWER OF TRANSMISSION LINE CROSSING COLUMBIA RIVER. REFERENCE MARK NO.1, STAMPED TRANS R.M. 1 1941, IS A STANDARD U.S.E. DISK CEMENTED IN A DRILL HOLE IN OUTCROPPING ROCK THAT IS FLUSH WITH THE GROUND. IT IS ABOUT 2.0 FEET LOWER THAN THE STATION. REFERENCE MARK NO.2, STAMPED TRANS R.M. 2 1941, IS A STANDARD U.S.E. BRONZE DISK CEMENTED IN A DRILL HOLE IN OUTCROPPING ROCK THAT IS FLUSH WITH THE GROUND. IT IS ABOUT 4.0 FEET HIGHER THAN THE STATION. STATION VACA (U.S.E.) WAS USED AS AZIMUTH MARK. STATION IS REACHED AS FOLLOWS-- FROM PLYMOUTH GO 0.8 MILE N TO DIRT ROAD ON THE E AT SIGN BRAND RANCH MOTTINGER 10. TURN E ON DIRT ROAD AND GO 1.3 MILES TO POWER LINE. TURN RIGHT (S) AND FOLLOW POWER LINE S 0.5 MILE TO STATION ON POINT OF CLIFF OVERLOOKING THE COLUMBIA RIVER.
01/01/1957 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1957 (VRS) STATION WAS RECOVERED IN GOOD CONDITION, ABOUT 1-1/2 MI. E OF PLYMOUTH, ABOUT 3 MI. NE OF UMATILLA, 55.5 FT. E OF THE SE CONCRETE FOOTING OF THE TALLEST TRANSMISSION TOWER (BEFORE THE POWERLINE CROSSES THE RIVER TO THE S), 8 FT. N OF THE S EDGE OF THE CLIFF OVERLOOKING THE COLUMBIA RIVER. NOT ON THE HIGHEST POINT. THE STATION IS A CORPS OF ENGINEERS DISK, STAMPED TRANS 1934 SET IN A DRILL HOLE IN BEDROCK, FLUSH WITH THE SURFACE OF THE GROUND. REFERENCE MARK 1 IS A CORPS OF ENGINEERS DISK, STAMPED TRANS NO 1 1941, SET IN A DRILL HOLE IN BEDROCK, FLUSH WITH THE GROUND, ABOUT 2 FT. LOWER THAN THE STATION. REFERENCE MARK 2 IS A CORPS OF ENGINEERS DISK, STAMPED TRANS NO 2 1941 SET IN A DRILL HOLE IN THE BEDROCK, FLUSH WITH THE SURFACE OF THE GROUND, ABOUT 4 FT. HIGHER THAN THE STATION. TO REACH THE STATION FROM THE JUNCTION OF THE HIGHWAYS IN PLYMOUTH, GO E TOWARD UMATILLA, ALONG THE MAIN PAVED ROAD FOR 1.0 MI., TURN LEFT THROUGH GUARD RAIL ONTO GRAVEL ROAD (A SECTION OF THE GUARD RAIL IS HINGED TO PERMIT ENTRY ONTO THE GRAVEL ROAD), GO 0.2 MI., TURN RIGHT ONTO A DIRT ROAD BEFORE ENTERING AN OLD TUNNEL, GO 0.2 MI. ALONG A DIRT ROAD (PASSING UNDER POWER TRANSMISSION LINES) TO THE STATION AT THE EDGE OF THE CLIFF.
01/01/1959 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (LGT) STATION AND REFERENCE MARKS WERE RECOVERED IN GOOD CONDITION. A NEW DESCRIPTION FOLLOWS-- STATION IS ABOUT 2.0 MILES EAST OF PLYMOUTH, ABOUT 3.0 MILES NORTHEAST OF UMATILLA, ON A ROCK POINT THAT PROTRUDES OUT INTO THE COLUMBIA RIVER ABOUT 0.2 MILE EAST OF THE NORTH END OF THE UMATILLA COUNTY TOLL BRIDGE. STATION IS ABOUT 70 FEET ABOVE LOW WATER. STATION MARK, STAMPED TRANS 1941, IS A STANDARD U.S. ARMY ENGINEERS CONTROL STATION DISK SET IN A DRILL HOLE IN BEDROCK. IT IS 8.0 FEET WEST OF THE EAST EDGE OF CLIFF AND ABOUT 60 FEET EAST-SOUTHEAST OF THE SOUTHEAST LEG OF THE NORTHERLY ONE OF THREE POWER LINE TOWERS. REFERENCE MARK 1, STAMPED TRANS NO 1 1941, IS A STANDARD U.S. ARMY ENGINEERS REFERENCE MARK DISK SET IN A DRILL HOLE IN BEDROCK. IT IS ABOUT 2 FEET LOWER THAN THE STATION MARK. REFERENCE MARK 2, STAMPED TRANS NO 2 1941, IS A STANDARD U.S. ARMY ENGINEERS REFERENCE MARK DISK SET IN A DRILL HOLE IN BEDROCK. IT IS ABOUT 4 FEET HIGHER THAN THE STATION MARK. STATION VACA (U.S.E.) MAY BE USED AS AZIMUTH MARK. TO REACH FROM HIGHWAY INTERSECTION AND POST OFFICE IN PLYMOUTH GO EAST ON PAVED ROAD TOWARD UMATILLA COUNTY TOLL BRIDGE FOR 1.0 MILE TO AN OPENING IN THE GUARD RAIL ON THE LEFT SIDE OF THE ROAD WHERE THE ABANDONED RAILWAY BED CROSSES THE ROAD. TURN LEFT OFF PAVED ROAD ONTO ABANDONED RAILWAY BED AND GO 0.15 MILE TO A TRACK ROAD LEADING RIGHT (SOUTH) AT A POINT ABOUT 200 FEET WEST OF OLD RAILWAY TUNNEL ENTRANCE. GO RIGHT AND FOLLOW TRACK ROAD 0.2 MILE TO NORTHERLY OF THREE POWER LINE TOWERS AND STATION AT EDGE OF CLIFF. DISTANCES AND DIRECTIONS TO REFERENCE MARKS WERE NOT MEASURED.
01/01/1969 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1969 (RBM) THE STATION AND REFERENCE MARKS WERE RECOVERED IN GOOD CONDITION AS DESCRIBED BY L.G.T. IN 1959. HOWEVER THE CEMENT AROUND THE STATION MARK HAD BEEN CHIPPED AWAY, LEAVING THE UPPER TWO INCHES OF THE SHANK OF THE DISK EXPOSED. THE MARK WAS REENFORCED WITH A PAD OF CONCRETE. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN 1-1/2 MILES NORTHEAST OF UMATILLA.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in December 1991.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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