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Details for Benchmark: JR1190

N 38° 34.928 W 119° 48.117 (NAD 83)

Altitude: 7656

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

Location:
In ALPINE county, CA View Original Datasheet
Designation:
IXL AZ MK
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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Ebbetts Pass area of California. As mentioned in the original description, the juniper tree is still there and was a good landmark. However there were just a bunch of rocks where the 2 x 3 rock cairn should have been.

[Photos:]
photoJR1190 station marker and the two reference marks

Documented History (by the NGS)

01/01/1973 by CADT (MONUMENTED)
DESCRIBED BY CALTRANS 1973 (RMB) THE STATION IS 7.9 MILES SOUTH-SOUTHWEST OF MARKLEEVILLE ON A GRANITE OUTCROP ADJACENT TO STATE HIGHWAY ROUTE 4. IT LIES IN THE NORTHWEST QUARTER OF SECTION 32, T.9N., R.20E., MOUNT DIABLO MERIDIAN. TO REACH THE STATION FROM MARKLEEVILLE POST OFFICE, GO 4.7 MILES SOUTHEAST ON STATE HIGHWAY ROUTE 89 TO JUNCTION OF STATE HIGHWAY ROUTES 4 AND 89, CONTINUE 9.9 MILES SOUTH ON ROUTE 4 TO THE STATION, APPROXIMATELY 250 FEET NORTH OF THE UPPER CASCADE CREEK BRIDGE. THE STATION MARK IS A CALIFORNIA DIVISION OF HIGHWAYS BRASS DISK STAMPED IXL AZI 1971, EPOXIED IN A DRILL HOLE IN GRANITE OUTCROP FLUSH WITH THE GROUND. IT IS LOCATED APPROXIMATELY 300 FEET NORTH OF AND 10.0 FEET LOWER THAN THE UPPER CASCADE CREEK BRIDGE. IT IS 100 FEET WEST OF UPPER CASCADE CREEK AND 6.0 FEET SOUTH OF A 2 BY 3 FOOT CAIRN. IT IS 10.0 FEET NORTH OF A 24-INCH JUNIPER TREE. REFERENCE MARK 1 IS A CALIFORNIA DIVISION OF HIGHWAYS BRASS DISK STAMPED IXL AZI RM 1 1971-1973, EPOXIED IN A DRILL HOLE IN GRANITE OUTCROP. IT IS LOCATED 40.0 FEET NORTH-NORTHWEST OF A 40-INCH PINE TREE, 17.0 FEET SOUTHWEST OF A 24-INCH JUNIPER TREE, AND IS SOUTHWEST OF AND 4.6 FEET HIGHER THAN THE STATION. REFERENCE MARK 2 IS A CALIFORNIA DIVISION OF HIGHWAYS BRASS DISK STAMPED IXL AZI RM 2 1971-1973, EPOXIED IN A DRILL HOLE IN GRANITE OUTCROP. IT IS LOCATED 26.0 FEET NORTHWEST OF A 24-INCH JUNIPER TREE, 16.0 FEET WEST OF A 2 BY 3 FOOT ROCK CAIRN, AND IS NORTHWEST OF AND 3.9 FEET HIGHER THAN THE STATION.

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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