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Details for Benchmark: JV1174

N 39° 24.000 W 076° 36.400 (NAD 83)

Altitude: 464.52

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

Location:
In BALTIMORE county, MD View Original Datasheet
Designation:
MARYLAND 465 BALTO USGS
Marker Type:
survey disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Found it early this evening.

[Photos:]
photoMARYLAND 465 BALTO USGS
photoJV1174 from a distance

Recovered in good condition on the S side of the E entrance..

N 39° 24.013, W 076° 36.365

[Photos:]
photoMARYLAND 465 BALTO USGS (JV1174) disk - Towson, MD
photoMARYLAND 465 BALTO USGS (JV1174) area - looking W

GPS coords take you to the left Sid of the building, but it is on the front side

[Photos:]
photoimage

Found and used while doing Land Surveying work in the area.

As described - Another easy one.

[Photos:]
photoMD 465 JV 1174

Found as described. I can't count how may times I passed this one. Note: the front 'main' entrance of the courthouse is now for employees only; the north and south entrances are for the public.

Found as described. Not going anywhere for a while.

Found this one on business in Towson. Used to pass by this everyday. It's in plain view, but I bet nobody really notices.

Found and added an updated description to the NGS datasheet. I pass this station everyday I had to log his one.

[Photos:]
photoStation 'MARYLAND 465 BALTO USGS'
photoStation by corner of wall
photoSoutheast corner of porch

Found as described. Obstructed by plants and hedges.

[Photos:]
photoClose Up Benchmark
Had to take these pictures blindly. The bushes obstructed being able to get behind the camera and use the view finder.
photoSame
I thought that the courthouse security might take a dim view of me crawling around in the bushes.
photoView of Front Porch
Mark is located on S/E corner of the porch mounted vertically. In the shadow in this photo.
photoTowson Courthouse

Documented History (by the NGS)

Unknown by USGS (MONUMENTED)
1/1/1942 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1942 AT TOWSON. THIS MARK IS AT TOWSON, BALTIMORE COUNTY, AT THE COURTHOUSE, SET IN THE CORNER STONE OF THE SOUTHEAST CORNER OF THE PORCH, 28.8 FEET SOUTH OF THE MAIN ENTRANCE, ABOUT 1.5 FEET HIGHER THAN THE WALK-WAY. STAMPED MARYLAND 465 BALTO. A USGS DISK SET VERTICALLY.

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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