PY0714 "C566 - 1983"

Visited Yellowstone National Park for the first time. A bucket-list item for me. Spent a few hours in West Yellowstone visiting the museum and doing a few touristy things. Looked for a few benchmarks too.

Located in the Town of West Yellowstone, Gallatin County, Montana, this NGS mark was set vertically in the south-facing wall of the old railroad station, which is now used as a museum for the City of West Yellowstone, the National Park, and everything else Yellowstone (and Montana).  The NGS mark stamped "C566 - 1983" was found at 14:30, 23 July 2019 as described and in good condition. Go to description is adequate to find the mark. You don't have to go through the Museum, just walk around back.

Published NAD83 coordinates are located about 182 feet southeasterly of the found WGS84 coordinates. WGS84 coordinates for the mark found by 3 minute occupation with 6 strong satellites and 1 WAAS satellite. It should be stated that the roof made satellite acquisition difficult.

View Original Datasheet Here

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Found Details for Benchmark: PY0714

N 44° 39.490 W 111° 06.049 (WGS 84)

Altitude: 6672

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Published Details for Benchmark: PY0714

N 44° 39.517 W 111° 06.067 (NAD 83)

Altitude: 6671.85

Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED.

Location: In Gallatin County, MT

Designation: C 566

Marker Type: bench mark disk

Setting: massive structures with deep foundations

Stability: Most reliable and expected to hold position/elevation well.

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Documented History (by the NGS)

01 Jan 83 by NGS (MONUMENTED)

DESCRIBED BY NATIONAL GEODETIC SURVEY 1983 IN WEST YELLOWSTONE. IN WEST YELLOWSTONE MONTANA, SET VERTICALLY IN THE SOUTH FACE OF THE MUSEUM OF THE YELLOWSTONE, 15.6 METERS (51.2 FT) EAST OF THE WEST CORNER OF THE MUSEUM, 13.7 METERS (44.9 FT) NORTH OF THE CENTER OF THE OLD RAILROAD BED, AND 8.3 METERS (27.2 FT) WEST OF THE SOUTH ENTRANCE OF THE MUSEUM. THE MARK IS 0.3 M ABOVE THE SIDEWALK.

01 Jan 87 by NGS (GOOD)

RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1987 RECOVERED IN GOOD CONDITION.

PY0714 "C566 - 1983" - Benchmark detail.

PY0714 "C566 - 1983" - Benchmark and GPSr.

PY0714 "C566 - 1983" - Benchmark setting.  Set vertically in the west end of the south wall of the Old West Yellowstone Railroad Station, now used as the Yellowstone Museum.  View north.

PY0714 "C566 - 1983" - Benchmark setting.  Set vertically in the west end of the south wall of the Old West Yellowstone Railroad Station, now used as the Yellowstone Museum.  View west.

PY0714 "C566 - 1983" - Benchmark setting.  Set vertically in the west end of the south wall of the Old West Yellowstone Railroad Station, now used as the Yellowstone Museum.  View east.

PY0714 "C566 - 1983" - Benchmark setting.  Set vertically in the west end of the south wall of the Old West Yellowstone Railroad Station, now used as the Yellowstone Museum.  View northeast.

PY0714 "C566 - 1983" - Benchmark coordinates.

Control Text

• The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
• The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
• The geoid height was determined by GEOID99.
• The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (g = 980.6199 gals.).
• The modeled gravity was interpolated from observed gravity values.