GS0618 "E 1377"

My Wife and I were able to spend a few days in and around Lone Pine and Independence, exploring the Alabama Hills, the Movie Museum, and Manzanar. Found some geocaches and benchmarks while we were there too, including this one.

Located about 2 miles south of the Town of Olancha, Inyo County, California, this NGS mark lies not far off the west side of State Route 395. This mark, which is a steel rod driven to refusal, is not stamped but rests in a monument well with the National Geodetic Survey identification on it.  It was found at 14:20, 09 April 2017 as described and in generally good condition. Go to description is adequate to find the mark.

Published NAD83 coordinates are located about 125 feet southwesterly of the found WGS84 coordinates. WGS84 coordinates for the mark found by 4 minute occupation with 9 strong satellites and 1 WAAS satellite.

View Original Datasheet Here

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Found Details for Benchmark: GS0618

N 36° 15.616 W 117° 59.767 (WGS 84)

Altitude: 3725

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Published Details for Benchmark: GS0618

N 36° 15.600 W 117° 59.783 (NAD 83)

Altitude: 3729.95

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

Location: In Inyo County, CA

Designation: E 1377

Marker Type: metal rod

Setting: stainless steel rod in sleve

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

GS0618 "E 1377" - A stainless steel rod in a well with lid.

GS0618 "E 1377" - A stainless steel rod in a well with lid. The well ring is clearly marked "National Geodetic Survey".

GS0618 "E 1377" - A stainless steel rod in a well with lid and GPSr.

GS0618 "E 1377" - Benchmark setting in the high desert sand with Carsonite witness post. View westerly along Walker Creek Road toward the eastern side of the Sierra Nevada Mountains.

GS0618 "E 1377" - Benchmark setting in the high desert sand with Carsonite witness post. View northeasterly toward the intersection of Walker Creek Road and State Route 395.

GS0618 "E 1377" - Benchmark setting in the high desert sand with Carsonite witness post. View southeasterly.

GS0618 "E 1377" - Benchmark coordinates.

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Documented History (by the NGS)

01 Jan 84 by NGS (MONUMENTED)

DESCRIBED BY NATIONAL GEODETIC SURVEY 1984 2.4 KM (1.5 MI) SOUTH FROM OLANCHA. 2.48 KM (1.54 MI) SOUTH ALONG US HIGHWAY 395 FROM THE POST OFFICE IN OLANCHA, AT THE EAST END OF AN EAST-WEST FENCE LINE, IN THE SOUTHWEST CORNER OF THE INTERSECTION OF WALKER CREEK ROAD, 44.8 METERS (147 FT) SOUTHWEST OF THE HIGHWAY CENTERLINE, 11.6 METERS (38 FT) SOUTHWEST OF THE CENTER OF A TRACK ROAD, 8.2 METERS (27 FT) SOUTH OF THE CENTER OF WALKER CREEK ROAD, 2.0 METERS (6.5 FT) SOUTH OF THE FENCE. THE MARK IS 0.5 METERS N FROM A WITNESS POST. THE MARK IS 0.3 M ABOVE THE HIGHWAY.

01 Jan 87 by NGS (GOOD)

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

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.