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Details for Benchmark: KU0978

N 40° 47.650 W 073° 46.833 (NAD 83)

Altitude: 10.84

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

Location:
In QUEENS county, NY View Original Datasheet
Designation:
851 6990 TIDAL 4
Marker Type:
bench mark disk
Setting:
pavements (street, sidewalk, curb, apron, etc.)
Stability:
Mark of questionable or unknown stability.

Must Read!

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Yesterday I spent a long day in Queens, NY. I walked the "341" level line, surveyed in 1952 from "A 341" in Bayside to "K 341" at the Whitestone Expressway, with a side trip around Fort Totten and a little extra jaunt in Flushing. It was about 12 miles on foot and I was exhausted by the end. But I found 8 marks out of 14 (with about 8 others I couldn't get to) which is pretty good.

There are 10 bench marks at the old US Army base in Fort Totten. I managed to find 4, including one of the 1909 original NYC survey marks. Two of my finds are not on GC, and as for the rest, probably at least 2 or 3 are there if anyone could figure out which building is which and can get access to an area which is shared by the Coast Guard, the NYC Fire Department and the NYC Police Department and if you can avoid the prolific Poison Ivy.

This mark was found in good condition as described.

This mark is across from building #615 (still used by the Coast Guard) and a few of Coast Guard folks were eating lunch there when I came by. I asked a few questions and they thought it was not a little wierd for someone to be out on a hot day snooping around for these marks. But they were very nice to me and reccomended that I talk to the expert on the old base at the museum. Unfortunately I didn't have time to do that. They also warned me about the poison ivy. And since this building was good for two marks I guess it was my favorite place in this old base.

The disk itself seems a little strange. The description does not mention any stamping and the only identification on the data sheet is "MARK_LOGO: USE".

Many marks from one agency are used by other agencies as bench marks and this is no exception. In this case the USC&GS (in 1952) used a US Army Corps of Engineers (USE) mark set here in 1938, when they surveyed this Tidal Brench Mark. But the disk is engraved: "Map Control Station". I've never heard of that one. I was a little apprehensive that it was the wrong disk, but since the NOS recovered it in 1995 at this exact position, it must be the right mark.

[b]Edit 5/8:[/b] BuckBrooke pointed out in a discussion on the Forum that the circle symbol in the center of a disk is generally used for tidal stations. So assuming that's the case here, it would seem that the USE had surveyed this as a tidal benchmark before ths CGS did their 1952 survey.

There were also two NGS marks that I recovered at Fort Totten that are not on GC, so I'll just mention them here. They were both in good condition and were set much more recently than any of the other marks in the area. They are

[url=http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=AH6732]AH6732 "851 6990 A TIDAL"[/url] set by the NOS in 1975
[url=http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=AH6731]AH6731 "851 6990 TIDAL 5"[/url] set by the NOS in 1982

Pictures of them are included.

[This entry was edited by Papa-Bear-NYC on Monday, May 08, 2006 at 6:30:55 AM.]

[Photos:]
photoKU0978 851 6990 TIDAL 4, Fort Totten, Queens NY
View of the edge of the parking lot across from building #810. This particular spot had fallen into some disuse and some equipment was stored nearby. A little digging was needed to uncover the mark.
photoKU0978 851 6990 TIDAL 4, Fort Totten, Queens NY
photoAH6732 851 6990 A TIDAL, Fort Totten, Queens NY
An NGS mark not on GC which was recovered nearby.
photoAH6731 851 6990 TIDAL 5, Fort Totten, Queens NY
An NGS mark not on GC which was recovered nearby.

Documented History (by the NGS)

01/01/1938 by DOD (MONUMENTED)
01/01/1952 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1952 AT NEW YORK. AT NEW YORK, IN BOROUGH OF QUEENS, AT WEST SIDE OF FORT TOTTEN, BETWEEN THE QUARTERMASTER DOCK AND JETTY, 26 FEET EAST AND ACROSS A CONCRETE DRIVE FROM THE NORTHEAST CORNER OF 2-STORY BRICK BUILDING NO. 193, 1/2 FOOT WEST OF A RETAINING WALL, IN THE TOP OF A CONCRETE DRIVE, 1/2 FOOT SOUTH OF AN EXPANSION JOINT IN DRIVE, 1/2 FOOT SOUTH OF AN ANGLE IN RETAINING WALL, AND LEVEL WITH DRIVE.
11/01/1995 by NOS (GOOD)
RECOVERY NOTE BY NATIONAL OCEAN SERVICE 1995 (KLD) THE BENCH MARK IS SET IN THE CONCRETE ROAD (LITTLE BAY ROAD) NEAR BUILDING NO. 615 AT THE US COAST GUARD STATION, 7.9 M (25.9 FT) EAST OF THE NE CORNER OF BUILDING NO. 615, 0.2 M (0.7 FT) SOUTH OF AN ANGLE IN THE RETAINING WALL, 0.2 M (0.7 FT) SOUTH OF AN EXPANSION JOINT IN THE ROAD, 0.2 M (0.7 FT) WEST OF THE RETAINING WALL, AND JUST SE OF A CHAIN LINK FENCE.

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 308 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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