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Details for Benchmark: SR0051

N 47° 35.417 W 108° 11.867 (NAD 83)

Altitude: 2252.53

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

Location:
In PHILLIPS county, MT View Original Datasheet
Designation:
1 BOLT
Marker Type:
bolt
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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As expected, the extreme high reservoir level in 2011 eroded out the MORC standpipe. Quarried stone and copper pin found undisturbed and should be there the next time it is used. Don't think that the COE ever wants to go to emergency spillway discharge rates again.

[Photos:]
photoSR0051-MORC BM 62-1-NGS 1 CAP-STAND PIPE-1804
photoSR0051-MORC BM 62-1-NGS 1 CAP- STONE AND BOLT-1807
photoMORC 62-2-N-1809
STONE ABOUT 8 INCHES BELOW THE SLOPING BANK.

Cap is missing from this standard four foot long MORC stand pipe which is centered over an underground quarried stone.

[Photos:]
photoSR0051 MORC BM 62-2
UNDERGROUND STONE
photoSR0051 N
MORC STONE WITH ITS STAND PIPE IS IN DANGER OF ERODING OUT OF THE WAVE ACTION BANK

Documented History (by the NGS)

Unknown by MORC (MONUMENTED)
01/01/1935 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1935 29.8 MI NE FROM WILDER. JUNCTION U.S. HWY. 191 AND STATE ROUTE 376, 13.6 MILES SW OF ALONG U.S. HWY. 191, THENCE 27.9 MILES E. ALONG GRAVELED AND GRADED ROAD ON NORTH SIDE OF THE MISSOURI RIVER AND OR FORT PECK RESERVOIR. 0.5 MILE WEST OF THE MOUTH OF C,K. CREEK. 95.0 FEET SOUTH OF SL RD. 38 FEET NORTH OF THE NORTH SHORE OF FORT PECK RESERVOIR AT HIGH WATER ELEV. A MISSOURI RIVER COMMISION STANDARD BOLT IN A CONCRETE SLAB.
01/01/1965 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1965 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.
  • 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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