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Details for Benchmark: JU0727

N 39° 57.183 W 075° 09.783 (NAD 83)

Altitude: 45.56

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

Location:
In PHILADELPHIA county, PA View Original Datasheet
Designation:
854 5530 TIDAL 29
Marker Type:
tidal station disk
Setting:
setting not listed - see description
Stability:
Mark of questionable or unknown stability.

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Found it even though there’s a ongoing construction. Looks ok but I had to take a photo from behind the fence.

[Photos:]
photoDisk

Found mark as described.

[Photos:]
photoMark
photoNearby

Found during our two days trip in Philly.

Thanks for showing

Had some time before taking the bus and went to find this one, since it was so close. Though my wife was a bit nervous and thought that something might happen and that we would miss the bus. Found the disk after a while. Some policeman thought I was paying Pokemon Go. I tales a bit with him and explained what I was looking for. As expected he had no idea what I was looking for. After I found it I showed him the picture I took

[Photos:]
photoThe benchmark

Found on my way to work

[Photos:]
photoJU0727

Found in good condition at broad st entrance

[Photos:]
photoCloseup
photoimage

I looked for this benchmark for quite a while, hoping that I could access it despite the significant construction that is occurring at the City Hall building. Alas, the disk is now behind a restricted area and is inaccessible for the time being.

[Photos:]
photoJU0727: Construction at City Hall North Entrance

Found while exploring downtown Philadelphia! Recovered in good condition.

[Photos:]
photoIMG_20150506_202412356

While walking around Philly.

[Photos:]
photoDSCN3264

Recovered in good condition

[Photos:]
photoBench Mark JU0727

Observed Benchmark.

[Photos:]
photoJU0727

I found it on the northern entrance of Philadelphia's City Hall.

[Photos:]
photoP1030169
photoP1030171

I found this a loooonnnnnggg time ago but it turns out I never logged it. So I went back today and grabbed another picture (if I ever find the original I will correc the log date) Mark recovered in good condition.

[Photos:]
photoSet in stone

Wow, it looks like there has been construction going on the area for the last ten years! I wonder what they’re building now! Fuzzy and I were taking advantage of the beautiful weather this afternoon by picking up a few benchmarks. We made our way to this one and found it easily. I had wanted to visit the Observation Deck today, but they were booked. Oh well, that’s a good excuse to come back again soon!

[Photos:]
photoJU0727

Found it. ..still behind construction fences, but in good shape.

Benchmark is there and in tact; undisturbed by nearby construction.

Found in good condition

Found this while visiting my daughter at Drexel.

[Photos:]
photoBenchmark

I always look for the iconic Philadelphia City Hall whenever we are in town. Today was the first time I took a walk through the building from south to north and stopped to photograph this benchmark near the north entrance. There is quite a bit of construction going on around the building but the benchmark is still very accessible.

[Photos:]
photoJU0727

found this while passing through town

[Photos:]
photo

Couldn't pass up a benchmark near this awesome building. Picture will be uploaded shortly.

[Photos:]
photobenchmark with lots of numbers in its title

Another Benchmark

Recovered as described in good condition.

[Photos:]
photoJU0727
photoArea

We were photographing the benchmark when a security guard approached. He knew all about benchmarks, but never knew there was one right under his feet! Everything is well and good with this one.

[Photos:]
photoclose up
photofurther away

Found it

Easy find even on a rainy day

[Photos:]
photoBenchmark close up with gate pushed towards wall
photoEye level with fence gate near it.

The mark is in good condition.

[Photos:]
photoJU0727(854 5530 TIDAL 29) - Philadelphia PA
photoJU0727 - Eye level
photoJU0727 - Looking S from the mark

Receovered this one while walking in downtown PHL. Not to hard to find once I looked at the pictures posted by others.

Found as described - right across the street from my hotel, and practically visible from the hotel room.

Recovery report submitted to the NGS.

[Photos:]
photoJU0727 854 5530 TIDAL 29 (disk) PHIL PA
photoJU0727 854 5530 TIDAL 29 (area) PHIL PA
Disk is located at left side of arch, on the ground right up next to the wall just inside the arch itself.

I was a little confused by the description in the NGS database and didn't find it on my first visit there. It is flush with the concrete walkway, about 0.7 foot west of the east wall of the north archway and about 1 foot south of the chain link gate swing post.

[Photos:]
photoJU0727-854 5530 TIDAL 29-3N.jpg
Looking north toward North Broad Street.

Found on our center city tour

Found this one with KrazyTrollz.

Found with angryEMT AND we got to go IN the building! way cool!

Found it while visiting for a conference.

[Photos:]
photoju0727.JPG

Meeting here with evrik and PW guy to talk about geocaching.

Saw it while with Evrik!

Found it with evrik.

Still there. Currently it is close to the western foot of a chain link fence across the entrance.

still in same spot, 1922

Wandered around city hall for a while. Besides finding the benchmark, I took note of the beautiful architecture of City Hall and its surroundings.

[Photos:]
photoCloseup of the benchmark
photoNorthern entrance
The benchmark is in the lower left corner in this photo.
photoCool statue across the street

Found exactly as described. Handheld coordinates are N39-57.179 W075-09.806.

[Photos:]
photoJU0727 - the Mark
photoJU0727 in Philadelphia, PA
Looking southeast at the east side of the north entrance to the City Hall, the mark is at the white notebook, center.

The north arch had been blocked due to construction until recently. Didn't find it the first time I looked, but that was mainly because I didn't bring the location description with me. It's a little dusty, though still where it is supposed to be. Well worth a walk through this arch to spend some time admiring this temporarily cut-off part of City Hall.

[This entry was edited by set on Tuesday, March 09, 2004 at 8:01:36 PM.]

This one may still be in place, but there was no way we could get near it with all the scaffolding that's been erected around City Hall. I was really looking forward to this one, too! We just weren't having too much luck with the benchmarks today. We will have to try again!

Zhanna and Aaron

[Photos:]
photoThe north archway ...
photoIt might be in there somewhere.

Documented History (by the NGS)

1/1/1922 by CGS (MONUMENTED)
1/1/1963 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1963 AT PHILADELPHIA. AT PHILADELPHIA, PHILADELPHIA COUNTY, AT THE CITY HALL, AT THE NORTH BROAD STREET ENTRANCE, UNDER THE NORTH ARCHWAY, NEAR THE NORTHEAST CORNER OF A LARGE GRANITE SLAB, AND ABOUT 2 FEET LOWER THAN THE FOUNDATION STONE. A STANDARD DISK, STAMPED ELEV 46.775 FT 29 1922.
1/1/1967 by CGS (MARK NOT FOUND)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1967 MARK NOT FOUND.
1/1/1979 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 RECOVERED IN GOOD CONDITION.
10/31/1998 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1998 RECOVERED IN GOOD CONDITION.
1/1/2000 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 2000 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.
  • This Tidal Bench Mark is designated as VM 370 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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