2019-07-21

JR0748 "6465"

Located in the town of Bridgeport, Mono County, California, this USGS mark lies on the west side of the Mono County Courthouse. Found USGS mark stamped "6465" at 16:31, 21 July 2019 as described and in generally good condition. The cap has weathered a bit, but is still readable. Go to description is adequate to find the mark.

Published NAD83 coordinates are located about 1050 feet southeasterly of the found WGS84 coordinates. WGS84 coordinates for the mark found by 4 minute occupation with 7 strong satellites and 1 WAAS satellite.

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Found Details for Benchmark: JR0748
N 38° 25.376, W 119° 13.723 (NAD 83)
Altitude: 6474
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Published Details for Benchmark: JR0748
N 38° 15.283 W 119° 13.533 (NAD 83)
Altitude: 6472.8

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

Location: In MONO county, CA
Designation: 6465
Marker Type: pipe cap
Setting: set into the top of a metal pipe driven into the ground
Stability: Mark of questionable or unknown stability.
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Documented History (by the NGS)
Unknown by USGS (MONUMENTED)

01 Jan 57 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1957 AT BRIDGEPORT. AT BRIDGEPORT, ALONG U.S. HIGHWAY 395, AT THE COUNTY COURTHOUSE, AT THE SOUTHWEST CORNER OF AN OFFSET IN THE WEST WALL, 2.0 FEET SOUTH OF THE SOUTH FACE OF THE WALL, AND RIVETED ON THE TOP OF A 3 1/2-INCH IRON PIPE PROJECTING 0.7 FOOT ABOVE THE GROUND.
JR0748 "6465" - Benchmark detail.
JR0748 "6465" - Benchmark and GPSr.
JR0748 "6465" - Benchmark setting on the west side of the County Court House.  View east.
JR0748 "6465" - Benchmark setting on the west side of the County Court House.  View southeasterly toward Main Street (State Route 395).
JR0748 "6465" - Benchmark setting on the west side of the County Court House.  View northerly.
JR0748 "6465" - Benchmark coordinates.
JR0748 "6465" - Front of the County Courthouse, circa 1880.
JR0748 "6465" - Front of the County Courthouse, circa 1880.

2019-03-30

KR1308 - "Q22 1932"

Found KR1308 on 26 March 2019 at 13:30 as described and in good condition. The building is no longer a train station, but has found new life as a resturant called The Depot Brewery and Distillery.

The Gravity Base Station 'RENO', referenced in the current data sheet as being set in the pavement directly below the mark, was not searched for.
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Found Details for Benchmark: KR1308
N 39° 31.866, W 119° 48.584 (NAD 83)
Altitude: 4504
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Published Details for Benchmark: KR1308
N 39° 31.850, W 119° 48.567 (NAD 83)
Altitude: 4501.19

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

Location: In WASHOE County, NV
Designation: Q22
Marker Type: bench mark disk
Setting: massive structures
Stability: Probably hold position/elevation well.

Documented History (by the NGS)
01 Jan 32 by CGS (MONUMENTED)

01 Jan 69 by NGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1969 IN RENO, AT THE NORTHWEST CORNER OF THE JUNCTION OF 4TH AND EAST STREETS, AT THE WESTERN PACIFIC RAILROAD STATION AT 325 4TH STREET, SET VERTICALLY IN THE WEST BRICK FACE OF THE STATION BUILDING, 92 FEET NORTH OF THE NORTH CURB OF 4TH STREET, 158 FEET WEST OF THE WEST RAIL, 160 FEET WEST OF THE CENTER LINE OF EAST STREET, 2.2 FEET NORTH OF THE NORTH SIDE OF THE WEST ENTRANCE, AND ABOUT 3 1/2 FEET HIGHER THAN THE ASPHALT PAVEMENT.  SEC 11, T19N, R 19E.

STATION RECOVERY (1996)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1996 (DW) RR STATION IS NOW HOLLAND LAND CORP.  BLDG. AT NE CORNER OF 4TH ST AND EVANS AVE.  GRAVITY BASE STATION 'RENO' (DOD 0454-4, NHO 32.24) IS ON PAVEMENT DIRECTLY UNDER DISK.

STATION RECOVERY (2003)
RECOVERY NOTE BY US POWER SQUADRON 2003 (PFM) BUILDING IS NOW THE BARENGO BUILDING

STATION RECOVERY (2009)
RECOVERY NOTE BY GEOCACHING 2009 (JA) RECOVERED IN GOOD CONDITION.

STATION RECOVERY (2013)
RECOVERY NOTE BY GEODETIC CONSULTING SERVICE 2013 (DRD) RECOVERED IN GOOD CONDITION.
KR1308 "Q22 1932" - Benchmark detail.
KR1308 "Q22 1932" - Benchmark and GPSr with coordinates.
KR1308 "Q22 1932" - Benchmark setting.  Set vertically in the west brick face of the Western Pacific Railroad Station, now known as the Depot Brewery and Distillery.
KR1308 "Q22 1932" - Benchmark setting.  Set vertically in the west brick face of the Western Pacific Railroad Station, now known as the Depot Brewery and Distillery.
KR1308 "Q22 1932" - Benchmark setting.  Set vertically in the west brick face of the Western Pacific Railroad Station, now known as the Depot Brewery and Distillery.
KR1308 "Q22 1932" - Benchmark setting.  Set vertically in the west brick face of the Western Pacific Railroad Station, now known as the Depot Brewery and Distillery.
KR1308 "Q22 1932" - State Historical Marker No 210.

2019-02-16

EW0940 - "T24 CADT"

Found EW0940 on 16 February 2019 at 16:51 as described and in good condition with the described witness post intact. The mark lies on the top edge of the embankment on the west side of the frontage road. This mark was set by the California Division of Highways, the predecessor to the current Caltrans.

Adjacent marks EW0941 (F1147) and EW0942 (G1147) were also located and found in good condition.  Described mark E1147 was not searched for.
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Found Details for Benchmark: EW0940
N 34° 52.835, W 117° 17.843 (NAD 83)
Altitude: 2326
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Published Details for Benchmark: EW0940
N 34° 52.817, W 118° 10.033 (NAD 83)
Altitude: 2434.6

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

Location: In KERN County, CA
Designation: T24 CADT
Marker Type: survey disk
Setting: set into the top of a round concrete monument
Stability: May hold, but of type commonly subject to surface motion.

Documented History (by the NGS)
01 Jan 58 by CADH (MONUMENTED)

01 Jan 73 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 1.3 MI N FROM ROSAMOND. 1.1 MILE NORTH ALONG THE SIERRA HIGHWAY FROM THE INTERSECTION OF ROSAMOND BOULEVARD AT ROSAMOND, THENCE 0.2 MILE WEST ACROSS COUNTRY, ABOUT 0.1 MILE SOUTHWEST AND ACROSS STATE HIGHWAY 14 FROM BENCH MARK E 1147, ON THE EAST SIDE OF A KNOLL, 42 FEET EAST OF THE CENTER LINE OF A DIRT ROAD, 27.0 FEET WEST OF THE CENTER LINE OF A FRONTAGE ROAD, 146.3 FEET EAST OF BENCH MARK F 1147, ABOUT 18 FEET HIGHER THAN STATE HIGHWAY 14, ABOUT 7 FEET HIGHER THAN THE FRONTAGE ROAD, 1.9 FEET WEST-SOUTHWEST OF A WITNESS POST, AND SET IN THE TOP OF A CONCRETE POST PROJECTING 0.1 FOOT ABOVE THE GROUND. SEC 8, T9N, R12W.

01 Jan 77 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 RECOVERED IN GOOD CONDITION.

EW0940 "T-24 CADT 1958" - Benchmark detail.
EW0940 "T-24 CADT 1958" - Witness post detail.
EW0940 "T-24 CADT 1958" - Witness post and benchmark setting. View southwesterly towards EW0941.
EW0940 "T-24 CADT 1958" - Witness post and benchmark setting. View northwesterly towards EW0942.
EW0940 "T-24 CADT 1958" - Benchmark setting. View southerly along the frontage road and State Route 14 toward the town of Rosamond.
EW0940 "T-24 CADT 1958" - Benchmark setting. View easterly across the frontage road and State Route 14.
EW0940 "T-24 CADT 1958" - Benchmark setting. View northerly along the frontage road and State Route 14.

EW0942 - "G1147"

Found EW0942 on 16 February 2019 at 16:47 as described and in good condition. The described 2'x2.5' outcrop is a stand-alone boulder without distinguishing markings. There is no witness post, but fallen survey lath was found nearby.

Adjacent marks EW0940 (T 24 CADT) and EW0941 (F1147) were also located and found in good condition.
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Found Details for Benchmark: EW0942
N 34° 52.832, W 118° 10.042 (NAD 83)
Altitude: 2323
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Published Details for Benchmark: EW0942
N 34° 52.817, W 118° 10.033 (NAD 83)
Altitude: 2444.73

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

Location: In KERN County, CA
Designation: T24 CADT
Marker Type: bench mark disk
Setting: in rock outcrop
Stability: Most reliable and expected to hold position/elevation well.

Documented History (by the NGS)
01 Jan 61 by CGS (MONUMENTED)

01 Jan 73 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 1.3 MI N FROM ROSAMOND. 1.1 MILES NORTH ALONG SIERRA HIGHWAY FROM THE INTERSECTION OF ROSAMOND BOULEVARD AT ROSAMOND, THENCE 0.2 MILE WEST ACROSS COUNTRY, IN THE TOP OF A 2- BY 2 1/2-FOOT OUTCROP WHICH PROJECTS ABOUT 2 FEET ABOVE THE GROUND, 81.4 FEET NORTHEAST OF BENCH MARK F 1147, 120.0 FEET WEST OF THE CENTER LINE OF A FRONTAGE ROAD, 56.8 FEET NORTHEAST OF THE NORTHEAST FACE OF A LARGE OUTCROP WHICH PROJECTS ABOUT 15 FEET ABOVE THE GROUND, 51.7 FEET WEST OF THE CENTER LINE OF A DIRT ROAD, ABOUT 14 FEET HIGHER THAN THE FRONTAGE ROAD AND ABOUT 7 FEET HIGHER THAN THE DIRT ROAD. SEC 8, T9N, R12W.

01 Jan 77 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 RECOVERED IN GOOD CONDITION.

EW0942 "G1147 1961" - Benchmark detail.
EW0942 "G1147 1961" - Benchmark setting in a 2'x2.5' outcrop, about 12" to 15" above the adjacent grade.
EW0942 "G1147 1961" - Benchmark setting. View northerly along the frontage road and State Route 14.
EW0942 "G1147 1961" - Benchmark setting. View southeasterly toward EW0940, the frontage road and State Route 14.
EW0942 "G1147 1961" - Benchmark setting. View southwesterly toward EW0941.


EW0941 - "F1147"

Found EW0941 on 16 February 2019 at 16:40 as described and in good condition with the described witness post intact. Recent surveying activities, including many pieces of flagged lath and paint on the rocks made the mark easy to find. For the record, I am NOT a fan of surveyor graffiti. Surveyors should leave little to no trace, especially in rural areas such as this.

Adjacent marks EW0940 (T 24 CADT) and EW0942 (G1147) were also located and found in good condition.
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Found Details for Benchmark: EW0941
N 34° 52.828, W 118° 10.032 (NAD 83)
Altitude: 2408
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Published Details for Benchmark: EW0941
N 34° 52.817, W 118° 10.033 (NAD 83)
Altitude: 2450.21

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

Location: In KERN County, CA
Designation: T24 CADT
Marker Type: bench mark disk
Setting: in rock outcrop
Stability: Most reliable and expected to hold position/elevation well.

Documented History (by the NGS)
01 Jan 61 by CGS (MONUMENTED)

01 Jan 73 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 1.3 MI N FROM ROSAMOND. 1.1 MILES NORTH ALONG SIERRA HIGHWAY FROM THE INTERSECTION OF ROSAMOND BOULEVARD AT ROSAMOND, THENCE 0.2 MILE WEST ACROSS COUNTRY, IN THE TOP OF A LEDGE ALONG THE SOUTH SIDE OF A LARGE OUTCROP WHICH PROJECTS ABOUT 15 FEET ABOVE THE GROUND, 168 FEET WEST OF THE CENTER LINE OF A FRONTAGE ROAD, 101.0 FEET WEST OF THE CENTER LINE OF A DIRT ROAD, 146.3 FEET WEST OF BENCH MARK T-24 (CHD), 14.4 FEET WEST OF A WITNESS POST, AND ABOUT 22 FEET HIGHER THAN THE FRONTAGE ROAD. SEC 8, T12W, R9N.

01 Jan 77 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 RECOVERED IN GOOD CONDITION.

EW0941 "F1147 1961" - Benchmark detail.
EW0941 "F1147 1961" - Benchmark setting in a large rock outcrop. Recent surveying activities made locating the mark relatively easy. I am NOT a fan of survey graffiti like this.
EW0941 "F1147 1961" - Witness post set approximately 15 feet southerly from the mark.
EW0941 "F1147 1961" - Benchmark setting. View northerly. Mark EW0942 lies northeasterly from the mark.
EW0941 "F1147 1961" - Benchmark setting.  View easterly toward EW0940, the frontage road and State Route 14.
EW0941 "F1147 1961" - Benchmark setting.  View southeasterly toward the frontage road and State Route 14.
EW0941 "F1147 1961" - Benchmark setting.  View southwesterly.

2019-01-06

EV2866 "Sunnyhill 1933" - Triangulation Station

I found this mark on a short trip along Old Route 66, about a mile east of Helendale, Ca. as described and in good condition. The described witness post is in place. Reference Mark No. 2 was located as described and in good condition. Reference Mark No. 1 was not located but most likely still exists.

The GPSr showed a found coordinate deviation of only 0.001' of longitude.  The altitude was about 10 feet off as I was holding the GPSr about 4 feet above the mark.  Both measurements well within the tolerance of the handheld Garmin.
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Found Details for Benchmark: EV2866
N 34° 44.968, W 117° 17.843 (NAD 83)
Altitude: 2633
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Published Details for Benchmark: EV2866
N 34° 44.967, W 117° 17.843 (NAD 83)
Altitude: 2623

Coordinates may not be exact. Altitude is VERT ANG and location is ADJUSTED.

Location: In SAN BERNARDINO county, CA
Designation: SUNNY HILL
Marker Type: triangulation station disk
Setting: set into the top of a round concrete monument
Stability: May hold, but of type commonly subject to surface motion.

Reference Points
EV1124, EV2865, & EV2924

Documented History (by the NGS)
01 Jan 33 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1933 (LCJ) ABOUT 1.5 MILES NORTHEAST OF HELENDALE, 38 FEET NORTH OF ROUTE 66, ABOUT 100 YARDS WEST OF SUNNY HILL GARAGE, AND 120 FEET WEST OF DIRT ROAD WHICH LEADS NORTH TO HINKLEY. TO REACH FROM HELENDALE, GO NORTHEAST 1.6 MILES ON ROUTE 66 DIRECT TO STATION SITE. MARKED BY STANDARD STATION DISK IN CONCRETE, NOTE 1A. REFERENCE MARKS ARE STANDARD REFERENCE DISKS IN CONCRETE, NOTE 11A. NO. 1 IS 19.903 METERS (65.30 FEET) FROM STATION IN AZIMUTH 71 DEG 29 MIN. NO. 2 IS 21.582 METERS (70.81 FEET) FROM STATION IN AZIMUTH 346 DEG 25 MIN. AZIMUTH FROM STATION TO LOS ANGELES-LAS VEGAS AIRWAY BEACON NO. 8 IS 37 DEG 55 MIN 13 SEC.

01 Jan 54 by USE (MONUMENTED)
RECOVERY NOTE BY US ENGINEERS 1954 STATION RECOVERED AS DESCRIBED. STATION MARK IS 0.4 FT. ABOVE THE GROUND SURFACE, AND ABOUT 0.5 FT. BELOW THE SURFACE OF U.S. HIGHWAY 66. LINE OF SIGHT FROM T-2 TRIPOD HEIGHT IS CLEAR IN ALL DIRECTIONS. REFERENCE MARKS 1 AND 2 RECOVERED IN GOOD CONDITION. THE AZIMUTH DESCRIBED FOR REFERENCE MARK 2 IS FROM THE REFERENCE MARK TO THE STATION RATHER THAN FROM THE STATION TO THE REFERENCE MARK AS INDICATED.

01 Jan 58 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (WRH) THE STATION MARK AND THE TWO REFERENCE MARKS WERE RECOVERED AS DESCRIBED AND IN GOOD CONDITION, EXCEPT THAT A SMALL DIFFERENCE IN THE MILEAGE FROM HELENDALE WAS NOTED. TO REACH THE STATION FROM THE RAILROAD STATION AT HELENDALE, GO E ON U.S. HIGHWAY 66 (TOWARD BARSTOW) FOR 1.8 MI. TO THE STATION ON THE LEFT.

01 Dec 92 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992 (AJL) STATION AND REFERENCE MARKS 1 AND 2 RECOVERED IN GOOD CONDITION. STATION IS LOCATED ABOUT 38.6 KM (24.0 MI) NORTH-NORTHEAST OF HESPERIA, 20.9 KM (13.0 MI) NORTHEAST OF ADELANTO, 2.4 KM (1.5 MI) NORTHEAST OF HELENDALE, ON THE HIGHWAY RIGHT-OF-WAY. OWNERSHIP--CALIFORNIA DEPARTMENT OF TRANSPORTATION. TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAY 395 AND SHADOW MOUNTAIN ROAD, NEAR 395 MILEPOST 27.00, ABOUT 16.1 KM (10.0 MI) NORTH OF ADELANTO, GO EAST ON SHADOW MOUNTAIN ROAD FOR 11.2 KM (7.0 MI) TO A T-INTERSECTION. TURN LEFT, NORTHEAST, ON HELANDALE ROAD FOR 2.3 KM (1.4 MI) TO AN INTERSECTION. TURN RIGHT, SOUTHEASTERLY, ON VISTA ROAD FOR 1.8 KM (1.1 MI) TO A T-INTERSECTION. TURN LEFT, NORTHEASTERLY, ON NATIONAL TRAILS HIGHWAY FOR 4.15 KM (2.58 MI) TO THE TOP OF A SLIGHT HILL AND THE STATION ON THE LEFT JUST BEFORE REACHING THE CENTER OF A GRAVEL INTERSECTION (MEADOW VIEW DRIVE). STATION MARK IS A DISK SET IN A 30 CM SQUARE CONCRETE MONUMENT THAT PROJECTS 6 CM. IT IS ABOUT 37.5 FT (11.4 M) (11.4 MT) NORTHWEST OF THE CENTER OF NATIONAL TRAILS HIGHWAY AND 0.6 M (2.0 FT) WEST OF A METAL WITNESS POST. NOTE--NGS REFERENCE OBJECT BOXSCORE AND 1933 DESCRIPTION GIVE INCORRECT AZIMUTH FOR REFERENCE MARK 2. REFERENCE MARK 2 IS APPROXIMATELY 166 DEGREES MAGNETIC (SOUTH) OF THE MAIN MARK, AS CORRECTLY STATED IN 1954 RECOVERY NOTE.

EV2866 "Sunnyhill 1933 - No. 2" - Triangulation Station detail.
EV2866 "Sunnyhill 1933 - No. 2" - Triangulation Station detail and GPSr.
EV2866 "Sunnyhill 1933 - No. 2" - Triangulation Station coordinates.
EV2866 "Sunnyhill 1933 - No. 2" - Triangulation Station setting.  View easterly along the National Trails Highway, aka Route 66.
EV2866 "Sunnyhill 1933 - No. 2" - Triangulation Station setting.  View westerly along the National Trails Highway, aka Route 66.
EV2866 "Sunnyhill 1933" - Triangulation Station setting.  View southerly across the National Trails Highway, aka Route 66, toward Reference Monument No. 2.
EV2866 "Sunnyhill 1933 - No. 2" - Reference Monument No. 2 detail.
EV2866 "Sunnyhill 1933 - No. 2" - Reference Monument No. 2 and GPSr.
EV2866 "Sunnyhill 1933 - No. 2" - Triangulation Station setting.  View northerly across the National Trails Highway, aka Route 66, toward the Station.

2017-04-09

GT0292 "3926 1905"

This early 1900s U.S. Geologic Survey Benchmark is located a the Inyo County courthouse in the beautiful town of Independence, Ca. The mark is set in the westerly face the southerly balustrade of the front steps of the Courthouse.

The coordinates shown by the GPSr were dramatically different from the published coordinates to the tune of about 1250 feet horizontally. I imagine it was due to signal multi-path or signal shadow caused by the building. Interestingly, the elevation was only 143 feet. I would have expected more given the horizontal error.

Regardless of the coordinates or GPSr error, the goto description on the datasheet is clear and makes finding the mark easy.
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Found Details for Benchmark: GT0292
N 36°48.212', W 118°11.985' (NAD 83)
Altitude: 3786
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Published Details for Benchmark: GT0292
N 36°48.100', W 118°12.200' (NAD 83)
Altitude: 3929.89

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

Location: In INYO county, CA
Designation: 3926
Marker Type: survey disk
Setting: massive structures
Stability: Most reliable and expected to hold position/elevation well.

Documented History (by the NGS)
01 Jan 05 by USGS (MONUMENTED)

01 Jan 62 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1962 AT INDEPENDENCE. AT INDEPENDENCE, AT THE COUNTY COURTHOUSE, SET VERTICALLY IN THE WEST-SOUTHWEST FACE OF THE SOUTH-SOUTHEAST ONE OF TWO BALISTRADES AT THE WEST-SOUTHWEST (MAIN) ENTRANCE, 15 1/2 FEET SOUTH-SOUTHEAST OF THE CENTER OF THE STEPS LEADING INTO THE BUILDING, 2.0 FEET ABOVE THE FIRST LANDING ABOVE THE GROUND, AND ABOUT 3 1/2 FEET ABOVE THE GROUND.

01 Jan 87 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1987 RECOVERED IN GOOD CONDITION.

GT0292 "3926 1905" - Benchmark detail.
GT0292 "3926 1905" - Benchmark, GPSr, and coordinates shown.
GT0292 "3926 1905" - Benchmark setting in the southerly balustrade of the Inyo County Courthouse in Independence, Ca.
GT0292 "3926 1905" - The impressive entrance to the Inyo County Courthouse in Independence, Ca.
GT0292 "3926 1905" - The copper cladded doors at the entrance to the Inyo County Courthouse in Independence, Ca.
GT0292 "3926 1905" - Plaque on the Inyo County Courthouse in Independence, Ca.
GT0292 "3926 1905" -  The view from the steps of the Inyo County Courthouse in Independence, Ca.