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Details for Benchmark: HT0717

N 37° 48.400 W 122° 25.650 (NAD 83)

Altitude: 111.34

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

Location:
In SAN FRANCISCO county, CA View Original Datasheet
Designation:
U 108
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Saw this benchmark while visiting in the area.

[Photos:]
photoHT0717
photoHT0717 Area
N 37° 48.438 W 122° 25.686

Found disk in fair-to-good condition, edges partially covered with roofing material.

[Photos:]
photoHT0717
U 108

I've found two benchmarks while in the USA. One on a mountaintop and the other on a rooftop...

Staying at the hostel.

[Photos:]
photoon the roof
photobenchmark

Found BM just behind small cyclone fence on the NW corner of roof to an abandoned gun emplacement. Could not find number of this emplacement (building).

Also sign on fence states 'OFF LIMITS', but BM is reachable from the W end of the cyclone fence.

Roof has ~30' antenna mast.

[Photos:]
photo026
HT0717, U108.
photo028
NW corner of the roof and W end of cyclone fence.
photo031
Sign on cyclone fence - OFF LIMITS
photo035
W end of fence is the other end.
photo035
W end of fence is the other end. Note the antenna mast.

Found it while geocaching in the area.

Found as described

Neat being around the fort buildings today. Found it on the roof. 50sumtin

[Photos:]
photoBenchmark on the roof.
Benchmark on the roof.

Found it. On the roof. Yes. The roof.

[Photos:]
photoHT0717.jpg
photoUp on the roof......

Found using description. Up on the roof.

[Photos:]
photoHT0717

As described.

[Photos:]
photoHT0717 BM.jpg
N 37° 48.439 W 122° 25.686

Good text description. Near chain link fence. Coordinates 291 feet off.
BKip

[Photos:]
photoHT0717, Fort Mason, San Francisco, CA
photoHT0717, Fort Mason, San Francisco, CA

Documented History (by the NGS)

1/1/1932 by CGS (MONUMENTED)
1/1/1952 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1952 AT SAN FRANCISCO. AT SAN FRANCISCO, AT FORT MASON, NORTH OF AND IN LINE WITH THE WEST END OF BUILDING T-241, IN THE TOP OF THE CONCRETE ROOF OF AN OLD GUN EMPLACEMENT (BUILDING NO. 242), 86 FEET NORTH OF THE CENTER LINE OF FUNSTON STREET, 16.7 FEET NORTH OF THE SOUTHWEST CORNER OF THE ROOF, 0.9 FOOT EAST OF THE WEST EDGE, AND ABOUT 2 FEET HIGHER THAN THE STREET.
1/1/1969 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1969 RECOVERED IN GOOD CONDITION.
9/16/1988 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1988 RECOVERED IN GOOD CONDITION WITH THE FOLLOWING EXCEPTIONS. ADD--0.5 M (1.6 FT) SOUTH OF A FENCE. NOTE--BUILDING T 241 MENTIONED IN THE ORIGINAL DESCRIPTION IS NOW BUILDING NUMBER 241-E.

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.

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