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Details for Benchmark: TU2064

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N 22° 01.140 W 160° 05.894 (NAD 83)

Altitude: 702

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

Location:
In KAUAI county, HI View Original Datasheet
Designation:
LEHUA 1926
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

Nearest

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Didn 10/20/2004 mjleelim couldn't find TU2064 (NGS Benchmark)   Visit Log
This was probably our most interesting experience with respect to survey marker hunting or geocaching - getting out to Lehua and climbing it.

Unfortunately, we didn't find this particular marker but did find reference marker 2.

Didn 10/20/2004 ltleelim couldn't find TU2064 (NGS Benchmark)   Visit Log
After visiting the degree confluence at 22°N 160°W, my wife and I continued on to Lehua and looked for this survey marker.

We did not find the survey marker. The top of Lehua is barren and no evidence of the survey marker was found. It probably has been destroyed. We are reporting it as not found, because the NGS prefers to see the remains of the actual marker before classifying it as destroyed.

We did not find reference mark 1. We did find an empty 1.5" pipe set in concrete at N 22 01.138 W 160 05.887, which corresponds to the location given for reference mark 1. This probably was the setting for reference mark 1, so reference mark 1 was presumably destroyed.

We found reference mark 2 in good condition at N 22 01.144 W 160 05.908.

The wooden tower with light no longer exists. The current Coast Guard light, named Lehua Rock Light, is on a metal post and is located at N 22 01.140 W 160 05.901.

We also found an unknown disk, stamped "ROCK 1972", at N 22 01.129 W 160 05.793. This presumably was left by the U.S. Navy recovery in 1972.


Photos:
photoLEHUA 1926 RM1 location, Lehua Island, Kauai, HI
photoLEHUA 1926 RM2 marker, Lehua Island, Kauai, HI
photoLEHUA 1926 RM2 location, Lehua Island, Kauai, HI
photoROCK 1972 marker, Lehua Island, Kauai, HI
photoROCK 1972 location, Lehua Island, Kauai, HI

Documented History (by the NGS)

1/1/1926 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1926 (CLG) ON THE HIGHEST POINT OF LEHUA ISLAND, THE SMALL ISLAND CLOSE TO AND NORTHWEST OF NIIHAU ISLAND. MARKED BY A STANDARD BRASS DISK CEMENTED INTO A 1 1/2-INCH PIPE SECURELY DRIVEN INTO GROUND. TWO STANDARD REFERENCE MARKS WERE SET. NO. 1, 14.180 METERS (46.52 FEET), FROM STATION IN AZIMUTH 92 DEG, MAGNETIC. NO. 2,21.555 METERS (70.72 FEET), IN AZIMUTH 283 DEG, MAGNETIC.
1/1/1931 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1931 (JHP) STATION IS O.K. EXCEPT THAT THE STATION MARK HAS BEEN SURROUNDED WITH A CONCRETE BLOCK, 12- BY 12- BY 18-IN (HIGH). A WOODEN SKELETON TOWER, PAINTED WHITE, SUPPORTING A FLASHING WHITE GAS LIGHT, FLASH 1 SEC. DURATION EVERY 10 SEC., BEARS 96 DEG 57 MIN AT A DISTANCE OF 20.84 FT. FROM THE STATION MARK. THE ELEVATION OF THE TOP OF THE TOWER IS 5.812 FT. ABOVE THE BRASS DISK OF THE STATION. ANOTHER REFERENCE MARK, CONSISTING OF A GALVANIZED NAIL SET IN CONCRETE, WAS PLACED ON A BEARING 276 DEG 31 MIN AT A DISTANCE OF 584.4 FT. FROM THE STATION. THIS BASE WAS USED IN MAKING A SURVEY OF THE SURROUNDING AREA FOR CONSTRUCTION PURPOSES.
1/1/1972 by USN (MONUMENTED)
RECOVERY NOTE BY US NAVY 1972 (PMR) REFERENCE MARK 2 WAS RECOVERED AND FOUND TO BE IN GOOD CONDITION. THE STATION MARK AND REFERENCE MARK 1 WERE FOUND DESTROYED. THERE IS PRESENTLY A COAST GUARD BEACON LOCATED VERY NEAR THE SAME PLACE THAT THE STATION WAS. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN ON THE HIGHEST POINT OF LEHUA ISLAND.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in December 1998. 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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