TU0509 - "Y 15" bench mark disk - Kahuku, HI - U.S. Benchmarks on Waymarking.com

As described by the US Coast and Geodetic Survey ("CGS") back in 1969:

"2.25 MILES NORTHWEST [of Kahuku] ALONG STATE HIGHWAY 83 FROM THE KAHUKU PLANTATION COMPANY HEADQUARTERS AT KAHUKU, IN THE TOP OF THE NORTHEAST END OF THE SOUTHEAST CONCRETE ABUTMENT OF A BRIDGE OVER NANAHU STREAM, 16.7 FEET NORTHEAST OF THE CENTER LINE OF THE HIGHWAY, 6.4 FEET NORTH OF THE NORTHWEST END OF A METAL GUARDRAIL, AND ABOUT 1/2 FOOT LOWER THAN THE HIGHWAY."

The CGS description is pretty accurate and should definitely assist future seekers in finding this benchmark -- alternatively, one can use the gallery images for any future attempt at actual recovery.

The station was recovered in good condition. The NGS' currently posted coordinates (N 21° 41.593 W 157° 58.673) are somewhat in line with my observations, although still ~13 feet off my personal readings -- as measured within 10' accuracy and 10+ reading averages. (FYI: the coordinates on www.geocaching.com are even more off from the true location, but that's irrelevant at this point since the NGS database has better readings by now).

Below are some additional facts, per the NGS database (with some editing for length): (visit link)

TU0509 ***********************************************************************
TU0509 DESIGNATION - Y 15
TU0509 PID - TU0509
TU0509 STATE/COUNTY- HI/HONOLULU
TU0509 COUNTRY - US
TU0509 USGS QUAD - KAHUKU (1983)
TU0509
TU0509 *CURRENT SURVEY CONTROL
TU0509 ______________________________________________________________________
TU0509* NAD 83(1986) POSITION- 21 41 35.55 (N) 157 58 40.36 (W) HD_HELD1
TU0509* LMSL ORTHO HEIGHT - 6.907 (meters) 22.66 (feet) ADJ UNCH
TU0509 ______________________________________________________________________
TU0509
TU0509_MARKER: DB = BENCH MARK DISK
TU0509_SETTING: 36 = SET IN A MASSIVE STRUCTURE
TU0509_SP_SET: ABUTMENT
TU0509_STAMPING: Y 15 1969
TU0509_MARK LOGO: CGS
TU0509_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
TU0509_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
TU0509+SATELLITE: SATELLITE OBSERVATIONS - June 07, 2005
TU0509
TU0509 HISTORY - Date Condition Report By
TU0509 HISTORY - 1969 MONUMENTED CGS
TU0509 HISTORY - 20050607 GOOD TERRSV
TU0509 HISTORY - 20130728 GOOD GEOCAC

Condition: Mark found in good condition Designation: Y 15 (stamped as "Y 15 1969") Benchmark Agency: U.S. Coast & Geodetic Survey Monumentation type: BENCH MARK (or B.M.) Disk County: Honolulu County (island of Oahu) USGS 7.5' Topographic Quadrangle Name (optional): Kahuku Find type: Coordinates and/or to-reach information from the NGS database (or Geocaching's copy of it) were used Web address of this benchmark's datasheet (optional): [Web Link] NGS PID: TU0509 Benchmark Agency (if other): Not listed Monumentation type (if other): Not listed Special category (optional): Not listed Special Category (if other): Not listed Local database's URL (optional): Not listed

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