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Details for Benchmark: HT0697

N 37° 48.483 W 122° 28.233 (NAD 83)

Altitude: 16.5

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

Location:
In SAN FRANCISCO county, CA View Original Datasheet
Designation:
941 4290 TIDAL 174
Marker Type:
tidal station disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Seen during my trip to SF

[Photos:]
photoDSC00833
N 37° 48.505 W 122° 28.268

BM not at the posted coords. Found at above coords.

At approximate center of 'Y' junction formed by Marine Dr. and Long Ave.
In center of a 6' diameter brick and rock circle.

[Photos:]
photo017
HT0697, 941 4290 Tidal 174 (BM 174).
photo019
Looking North. Hydrant, Manhole Cover (under front of SUV), and to the left - Building T989.

On a road trip with Pinz712 and the dog to Tahoe and through San Fran and the coast to Southern California.

[Photos:]
photoBench from 5 feet in the dark

My GPSr: N 37 48.505, W 122 28.279

Easy to spot at the location described in the datasheet. Will post some phone-camera images. -Batch218-

[Photos:]
photoBenchmark
Benchmark
photoMark with GPSr
Mark with GPSr
photoIn situ
In situ

Nikki and I found it while checking out Fort Point and I saw another nearby

[Photos:]
photoPicture 002

Just a few feet away from HT2255...

[Photos:]
photo941 4290 TIDAL 174 - San Francisco, CA

Found it. I can't believe how many times I've been down here finding other benchmarks and missed this one. (Until today!)

[Photos:]
photoDisk
photoGolden Gate in Background

Found in the Y junction leading from Mason Street to the seawall. Discovered by accident while looking for other benchmarks. Cool!

Documented History (by the NGS)

1/1/1925 by CGS (MONUMENTED)
1/1/1952 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1952 AT SAN FRANCISCO. AT SAN FRANCISCO, AT THE PRESIDIO, ABOUT 125 FEET WEST OF THE PROLONGATION OF THE WEST LINE OF THE ENGINEERS DOCK WHERE IT CROSSES MARINE DRIVE, AT THE APPROXIMATE CENTER OF A Y JUNCTION FORMED BY MARINE DRIVE AND A ROAD LEADING SOUTHEAST TO FORT WINFIELD SCOTT, 42.7 FEET SOUTHWEST OF A FIRE PLUB, 28.3 FEET SOUTH OF THE SOUTH EDGE OF AN IRON MAN HOLE COVER, AND SET IN THE TOP OF A CONCRETE POST FLUSH WITH THE DRIVE.
1/1/1969 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1969 RECOVERED IN GOOD CONDITION.
1/1/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 RECOVERED IN GOOD CONDITION.
9/13/1988 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1988 RECOVERED IN GOOD CONDITION WITH THE FOLLOWING EXCEPTIONS. ADD--IN THE CENTER OF A 6.0 FOOT DIAMETER BRICK AND ROCK CIRCLE, 15.5 M (50.9 FT) SOUTH-SOUTHWEST OF THE SOUTH CORNER OF THE NATIONAL PARK SERVICE BUILDING NUMBER T989, AND 4.7 M (15.4 FT) NORTHEAST OF THE CENTERLINE OF MARINE DRIVE.

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. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • This Tidal Bench Mark is designated as VM 971 by the Center for Operational Oceanographic Products and Services.
  • 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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