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Details for Benchmark: HT2495

N 37° 47.187 W 122° 08.674 (NAD 83)

Altitude: 1207

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
CORRAL 1953
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Mark of questionable or unknown stability.

Reference Points

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Documented History (by the NGS)

01/01/1953 by CA2480 (MONUMENTED)
DESCRIBED BY CITY OF OAKLAND CALIFORNIA 1953 STATION IS LOCATED ON A KNOLL BETWEEN SKYLINE BOULEVARD AND THE OAKLAND-ALAMEDA COUNTY BOUNDARY LINE AND BEARS S 60 DEG 35 MIN 36 SEC W, A DISTANCE OF 428.21 FEET FROM A MONUMENT AT THE CITY OF OAKLAND BOUNDARY CORNER KNOWN AS YP 3. THE STATION IS ABOUT 100 FEET SOUTHERLY OF A CORRAL FENCE ENCLOSING THE SHOW AREA OF THE AAHMES MOUNTED PATROL AND ABOUT 200 FEET WESTERLY OF THE ENTRANCE GATE OF THE CORRAL. STATION IS A DRILLED HOLE IN A BRONZE DISK SET IN A CONCRETE MONUMENT, THE SURFACE OF WHICH IS FLUSH WITH THE GROUND. THERE IS NO UNDERGROUND MARK AND THE ELEVATION OF STATION HAS NOT BEEN DETERMINED.
01/01/1962 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1962 (IRR) THE STATION MARK WAS RECOVERED IN GOOD CONDITION AND IS LOCATED ON A LOW, GRASSY KNOLL ALONG THE CREST OF THE SAN LEANDRO HILLS, AIRLINE ABOUT 2 MILES EAST-NORTHEAST OF MILLS COLLEGE, 1/5 MILE NORTHEAST OF SKYLINE BOULEVARD, AND 0.05 MILE SOUTH-SOUTHEAST OF AIRWAY BEACON 1A. TO REACH THE STATION FROM THE INTERSECTION OF SKYLINE BOULEVARD AND REDWOOD ROAD IN THE NORTHEAST PART OF OAKLAND GO SOUTHEAST ON SKYLINE BOULEVARD 2.0 MILES TO A CROSSING STRIP. CROSS OVER TO THE NORTHWEST-BOUND LANES AND GO NORTHWEST ON SKYLINE BOULEVARD 0.4 MILE TO A SIDE ROAD ON THE RIGHT. TURN RIGHT AND GO NORTHEAST 0.2 MILE TO A FORK. TAKE THE RIGHT FORK AND GO SOUTHEAST 0.15 MILE TO THE STATION. THE STATION MARK IS A CITY OF OAKLAND BRONZE DISK STAMPED STA CORRAL SET IN THE TOP OF A 16-INCH SQUARE CONCRETE POST FLUSH WITH THE GROUND AND ABOUT 65 YARDS SOUTH-SOUTHWEST OF A FENCE ENCLOSING THE AAHMES MOUNTED PATROL SHOW AREA CORRAL.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in March 1994. The horizontal coordinates are valid at the epoch date displayed above. The epoch date for horizontal control is a decimal equivalence of Year/Month/Day.
  • The orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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