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Details for Benchmark: HL0250

N 37° 16.583 W 107° 52.683 (NAD 83)

Altitude: 6561.34

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

Location:
In LA PLATA county, CO View Original Datasheet
Designation:
S 20
Marker Type:
bench mark disk
Setting:
mat foundation, concrete slab, etc.
Stability:
May hold, but of type commonly subject to surface motion.

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Found as described in good condition!

[Photos:]
photoHL0250
Durango

Found it after searching a nearby geocache.

Found while working on a Wherigo Cache.

13 S 0244815E 4129424N 1993 m

[Photos:]
photoS 20 -- La Plata County, CO

Found as described in good condition.

[Photos:]
photoHL0250

found while on vacation

[Photos:]
photohl0250 w-gps
photoclose up

Found as described.
Recovery report submitted to the NGS.

Formerly the High School; now School District Admin offices.
An absolutely lovely rose garden is just west of the mark.

[Photos:]
photoHL0250 S 20 1928 (CLOSEUP) LA PLATA county, CO
photoHL0250 S 20 1928 (VIEW NNE) LA PLATA county, CO
Mark is set in top of right side of lowest step (the steps on the right/uphill/east end of the front of the building)
photoHL0250 S 20 1928 (AREA NNE) LA PLATA county, CO
A photo showing the steps, the building, and in center at top left of steps - a rose garden maintained by a local gardening club.
photoHL0250 S 20 1928 (AREA) LA PLATA county, CO
Four Corners Rose Garden, adjacent to mark to the west. The roses were just coming into bloom, except for a yellow rose tree that was in magnificent full flower.
photoHL0250 S 20 1928 (AREA) LA PLATA county, CO
Bees were busy at work on the yellow rose tree located just to the west of the mark.

The boys have seen this building before, but when I asked them to read the name and the date. I got wow's.

[Photos:]
photoIMAGE_086
N 37° 16.582 W 107° 52.683

Bench Mark S 20 was recovered as described in 1984, in good condition. This is the south entrance to the old high school building, and is now the School District 9R Administration Building.

[Photos:]
photoHL0250 20060511 G (La Plata Co. CO)
Bench Mark S 20 w/GPSr.
photoHL0250 20060511 C (La Plata Co. CO)
Bench Mark S 20.
photoHL0250 20060511 B (La Plata Co. CO)
Bench Mark S 20 from Eye Level.
photoHL0250 20060511 A1 N (La Plata Co. CO)
North at Bench Mark S 20.

Found as described.

[Photos:]
photoHL0250
photoThe Steps
photoThe School

Documented History (by the NGS)

01/01/1928 by CGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1928 IN DURANGO. IN EAST END OF BOTTOM STEP OF EAST STAIRS ON SOUTH SIDE OF HIGH SCHOOL, LEADING UP FROM SIDEWALK.
01/01/1928 by NGS (GOOD)
01/01/1984 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984 RECOVERED IN GOOD CONDITION. A NEW DESCRIPTION FOLLOWS. IN DURANGO AT THE INTERSECTION OF SECOND AVENUE AND 12TH STREET, IN THE EAST END OF THE BOTTOM STEP OF THE EAST SET OF STEPS AT THE SOUTH ENTRANCE TO THE SCHOOL DISTRICT 9R ADMINISTRATION BUILDING (OLD HIGH SCHOOL), 15.6 METERS (51.2 FT) NORTH OF THE CENTER OF THE STREET, 14.7 METERS (48.2 FT) EAST OF THE EXTENDED CENTER OF THE AVENUE, AND 11.9 METERS (39.0 FT) EAST OF THE CENTER OF A SIDEWALK. THE MARK IS 0.3 M ABOVE THE STREET.

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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