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Details for Benchmark: TY8080

N 59° 27.359 W 135° 19.509 (NAD 83)

Altitude: 22.23

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

Location:
In SKAGWAY-HOONAH-ANGOON county, AK View Original Datasheet
Designation:
T 187
Marker Type:
bench mark disk
Setting:
abutments and piers of large bridges
Stability:
Probably hold position/elevation well.

Reference Points

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Documented History (by the NGS)

1/1/1988 by NGS (MONUMENTED)
1/13/1989 by GSC (GOOD)
DESCRIBED BY GEODETIC SURVEY OF CANADA 1989 NATIONAL GEODETIC SURVEYS TABLET SET IN TOP AT THE NE CORNER OF CONCRETE ANCHOR PAD FOR SWINGING BRIDGE OVER SKAGWAY RIVER, AT THE SW END OF SKAGWAY TOWNSITE, 2.2 KM SOUTH OF BRIDGE OVER SKAGWAY CREEK ALONG WHITEHORSE-SKAGWAY HWY (STATE STREET) THEN 0.35 KM WESTERLY ALONG FIRST AVENUE, AT THE SOUTH END OF RUNWAY FOR SKAGWAY AIRPORT, ALONG PROJ C/L OF FIRST AVENUE, 41.1 M NW OF PROJ C/L OF RUNWAY, 13.1 M SE OF THE EASTERLY BANK OF RIVER, 2.1 M NE OF PROJ C/L OF BRIDGE, 18 CM SOUTH OF THE NORTHERLY FACE AND 18 CM WEST OF THE EASTERLY FACE OF PAD, 25 CM ABOVE GROUND LEVEL. ESTABLISHED BY GEODETIC SURVEYS OF CANADA.
5/6/1993 by NOS (GOOD)
RECOVERY NOTE BY NATIONAL OCEAN SERVICE 1993 (JGF) THE STATION IS LOCATED ON THE SOUTHEASTERN SHORE OF THE SKAGWAY RIVER IN SKAGWAY, ALASKA. THE STATION IS IN A PUBLIC ACCESS AREA WEST OF THE SOUTHWEST END OF THE AIRPORT RUNWAY. IT IS WEST OF THE END OF FIRST STREET, BUT ON THE EXTENDED CENTERLINE. THE MARK IS .18 M (0.59 FT) SOUTH OF THE NORTH EDGE AND .18 M (0.59 FT) WEST OF THE EASTERN EDGE OF A 4.2 M (13.8 FT) BY 4.2 M (13.8 FT) CONCRETE BLOCK WHICH SERVES AS THE ANCHOR FOR A FOOT BRIDGE CROSSING TO YAKUTANIA POINT CITY PARK. THE MARK IS 2.2 M (7.2 FT) WEST OF THE AIRPORT PERIMETER FENCE.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in November 1994. This is a SPECIAL STATUS position. See SPECIAL STATUS under the DATUM ITEM on the data sheet items page.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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