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Details for Benchmark: HT2492

N 37° 47.316 W 122° 11.542 (NAD 83)

Altitude: 231

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
HIGH
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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Found where described

[Photos:]
photoFor reference
photoEye level
photoMark

Found HIGH/1947 as described at the adjusted coordinates. I looked quickly for RM1 and RM2, but didn't see them. We happen to drive by the Azimuth mark (which should be at about N 37 47.179, W 122 11.813), and, from the car, I spotted it in the curb (the description calls it the west curb, but it's really the north curb), but we didn't stop to look at it.

[Photos:]
photoHT2492 Environment
Looking NW over the westbound half of High Street with St Lawrence O'Toole Catholic Church in the background. The mark is the small concrete square in the grass near the bottom of the frame.
photoHT2492

Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1947 (WMG) THE STATION IS LOCATED IN THE GRASSY PARK WAY IN THE CENTER OF HIGH STREET, 76 FEET NORTHEAST OF THE CENTERLINE OF KANSAS STREET AND IS ON THE CENTERLINE OF HIGH STREET. THE DISK IS A STANDARD STATION MARK DISK AND THE MARK IS FLUSH WITH THE GROUND. THE DISK IS STAMPED HIGH 1947. REFERENCE MARK NO. 1 IS 40.390 FEET NORTHEAST OF THE STATION, 120 FEET NORTHEAST OF THE CENTERLINE OF KANSAS STREET, AND 9 FEET EAST OF THE CENTERLINE OF THE PARKWAY. THE DISK IS A STANDARD REFERENCE DISK AND THE MARK IS SET FLUSH WITH THE GROUND AND THE EAST CURB OF THE PARKWAY. THE DISK IS STAMPED HIGH NO 1 1947. REFERENCE MARK NO. 2 IS 44.491 FEET SOUTHWEST OF THE STATION, 43 FEET NORTHWEST OF A CITY SURVEY MONUMENT, 36 FEET NORTH OF THE CENTERLINE OF KANSAS STREET, AND 9 FEET WEST OF THE CENTERLINE OF THE PARKWAY. THE DISK IS A STANDARD REFERENCE DISK AND THE MARK IS SET FLUSH WITH THE GROUND AND THE WEST CURB OF THE PARKWAY. THE DISK IS STAMPED HIGH NO 2 1947. THE CITY SURVEY MONUMENT IS 85.279 FEET SOUTHEAST OF THE STATION, 18 FEET EAST OF THE CENTERLINE OF HIGH STREET, AND 3 FEET NORTH OF THE CENTERLINE OF KANSAS STREET. THE MONUMENT IS UNMARKED AND THE POINT IS SET IN AN 8 INCH SUMP 1 FOOT BELOW THE SURFACE OF HIGH AND KANSAS STREETS. THE AZIMUTH MARK IS 0.3 MILE SOUTHWEST OF THE STATION, 86 FEET SOUTH OF THE CENTERLINE OF QUIGLEY STREET, AND 24 FEET WEST OF THE CENTERLINE OF HIGH STREET. THE DISK IS A STANDARD AZIMUTH DISK AND THE MARK IS SET FLUSH WITH THE GROUND AND THE WEST CURB OF HIGH STREET. THE DISK IS STAMPED HIGH 1947.
01/01/1963 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1963 (PAW) THE STATION MARK, AZIMUTH MARK, CITY MONUMENT, AND REFERENCE MARKS NUMBER 1 AND 2 WERE RECOVERED IN GOOD CONDITION AND THE 1947 DESCRIPTION IS ADEQUATE WITH THE FOLLOWING ADDITIONS AND CORRECTIONS-- THE STATION MARK IS 11.7 FEET NORTHWEST OF THE NORTHWEST CURB OF THE NORTHEAST-BOUND LANE OF HIGH STREET AND 10.4 FEET SOUTHEAST OF THE SOUTHEAST CURB OF THE SOUTHWEST-BOUND LANE OF HIGH STREET. REFERENCE MARK NUMBER 1 IS 12.304 METERS 40.368 FEET NORTHEAST OF THE STATION MARK AND ABOUT 3 FEET HIGHER. REFERENCE MARK NUMBER 2 IS 13.540 METERS 44.422 FEET SOUTHWEST OF THE STATION MARK AND ABOUT 3 FEET LOWER.

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 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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