Details for Benchmark: OA1241
N 43° 16.266 W 124° 05.188 (NAD 83)
Coordinates may not be exact. Altitude is VERTCON and location is ADJUSTED. (more info)
- In COOS county, OR View Original Datasheet
- Marker Type:
- survey disk
- in a boulder
- Mark of questionable or unknown stability.
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Documented History (by the NGS)
|01/01/1942 by USGS (MONUMENTED)
|DESCRIBED BY US GEOLOGICAL SURVEY 1942 (JCS)
BLUE (U.S.G.S.) IS MARKED BY A GEOLOGICAL SURVEY DISK CEMENTED IN A DRILL HOLE IN A BOULDER THAT IS CENTERED UNDER BLUE RIDGE LOOKOUT TOWER OF THE FOREST SERVICE. IT IS 6.600 METERS DISTANT FROM BLUE (C. AND G.S.) IN AZIMUTH 237 DEG 40 MIN 30 SEC.
THE STATION AND LOOKOUT IS LOCATED ABOUT 3.5 MILES, AIR LINE, ESE FROM SUMNER. ABOUT 9.5 MILES SE FROM MARSHFIELD ON THE HIGHEST POINT AND CENTER OF A LONG RIDGE THAT HAS A FRINGE OF TREES ACROSS THE S END.
BLUE RIDGE LOOKOUT TOWER IS A WOODEN STRUCTURE, ABOUT 65 FEET IN HEIGHT. THE HOUSE IS PAINTED WHITE AND THE SUPPORTS ARE PAINTED BLACK.
BY DISTANCE AND DIRECTION FROM STATION BLUE (C. AND G.S.).
|01/01/1953 by CGS (GOOD)
|RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1953 (CTH)
BLUE RIDGE LOOKOUT TOWER IS A WOODEN LOOKOUT TOWER BELONGING TO THE COOS COUNTY FIRE PROTECTIVE ASSOCIATION. IT IS LOCATED ABOUT 16 MILES NORTH OF MYRTLE POINT ON THE HIGHEST POINT OF BLUE RIDGE.
THE TOP OF THE STRUCTURE IS ABOUT 50 FEET HIGH.
A TRAVERSE CONNECTION WAS MADE FROM TRIANGULATION STATION BLUE 1942. THE DISTANCE IS 21.61 FEET OR 6.587 METERS.
|01/01/1975 by NGS (GOOD)
|RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1975 (CLN)
BLUE RIDGE LOOKOUT TOWER HAS BEEN DESTROYED. STATION GOOD.
AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN 10 MILES SOUTHEAST OF COOS BAY.
|01/01/1989 by USPSQD (GOOD)
|RECOVERY NOTE BY US POWER SQUADRON 1989 (AES)
RECOVERED IN GOOD CONDITION.
- The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in October 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- The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)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.