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Details for Benchmark: BM0548

N 30° 20.139 W 097° 35.531 (NAD 83)

Altitude: 674

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

Location:
In TRAVIS county, TX View Original Datasheet
Designation:
BALD KNOB
Marker Type:
triangulation station disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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A lot of construction in the area (for new toll road SH 130) made this difficult to reach. Daylight was fading fast and I left the flashlight in the truck since I thought I get there in time. But the climb up this hill took more time than I thought it would. Found the last reference mark and got out of the woods when I could barely see.

[Photos:]
photoBM0548

Found w/ TxHiPowr

N 30° 20.138 W 097° 35.529

Recovered as described in good condition.

TxHiPowr

Documented History (by the NGS)

01/01/1935 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (CAS) THIS STATION IS ABOUT 10 MILES E OF AUSTIN, AND ABOUT 13 MILES W OF ELGIN, AND 22 MILES NW OF BASTROP, ON LAND OWNED BY TRAVELERS INSURANCE COMPANY AND OCCUPIED BY C.D. HOWSE. THE MARK IS SET ON THE HIGHEST POINT OF A BARE MOUND, ABOUT 0.35 MILE ENE OF TEXAS ROUTE 20, ABOUT 0.2 MILE NW OF MR. HOWSES HOUSE, AND 6 FEET SW OF FENCE LINE WHICH RUNS OVER THE TOP OF THE HILL. MARK PROJECTS 4 INCHES. SURFACE, UNDERGROUND, REFERENCE AND AZIMUTH MARKS ARE STANDARD BRONZE DISKS SET IN CONCRETE. REFERENCE MARK NO. 1 IS SE OF THE STATION, 8 FEET N OF FENCE LINE, 11 FEET SW OF FENCE LINE, AND PROJECTS 5 INCHES. REFERENCE MARK NO. 2 IS SSE OF THE STATION, 6 FEET N OF FENCE LINE, AND PROJECTS 5 INCHES. AZIMUTH MARK IS WNW OF THE STATION, ABOUT MIDWAY UP A LONG HILL. THE MARK IS SET IN THE SW CORNER OF THE BLUE GOOSE CHURCH YARD (COLORED), 116 FEET S OF THE SW CORNER OF THE CHURCH, 44 FEET N OF THE CENTER LINE OF TEXAS ROUTE 20, AND 32 FEET SE OF THE CENTER LINE OF A GRAVEL ROAD LEADING NW. PROJECTS 6 INCHES. TO REACH STATION FROM AUSTIN, INTERSECTION OF TEXAS ROUTES 20 AND 71, GO N AND E ON ROUTE 20 FOR 11.2 MILES TO A LANE LEADING RIGHT AT A HOUSE. THIS LANE IS 0.5 MILE E OF THE BLUE GOOSE CHURCH. TURN RIGHT IN LANE AND GO 0.4 MILE TO TURN (S) (LEFT). GO S 0.1 MILE TO GAP IN FENCE AT THE W EDGE OF ORCHARD. HERE TURN LEFT AND GO 0.1 MILE TO TOP OF HILL AND STATION. ALL LIGHTS ARE VISIBLE FROM THE GROUND.
01/01/1937 by TXHD (GOOD)
RECOVERY NOTE BY TEXAS HIGHWAY DEPARTMENT 1937 STATION AND REFERENCE MARKS RECOVERED IN GOOD CONDITION. DESCRIPTION SATISFACTORY.
01/01/1943 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943 (TAK) FOUND AS ORIGINALLY DESCRIBED IN GOOD CONDITION.
01/01/1953 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1953 (EWR) STATION IS 12.8 MI. E ALONG THE TEXAS AND NEW ORLEANS RAILROAD FROM THE STATION AT AUSTIN, THENCE 0.6 MI. NW, ON TOP OF A HILL, 0.2 MI. NW OF A FARMHOUSE, 0.15 MI. E OF A PRIVATE ROAD, 5 FT. S OF A FENCE, A TRIANGULATION-STATION DISK, SET IN THE TOP OF A CONCRETE POST WHICH PROJECTS 0.5 FT. ABOVE THE GROUND, AND STAMPED BALD KNOB 1935. REFERENCE MARK 1 IS 105.0 FT. E OF TRIANGULATION STATION BALD KNOB 1935, 11 FT. S OF AN E-W FENCE, 7 FT. W OF A N-S FENCE, A REFERENCE-MARK DISK, SET IN THE TOP OF A CONCRETE POST WHICH PROJECTS 0.6 FT. ABOVE THE GROUND, AND STAMPED BALD KNOB NO 1 1935. REFERENCE MARK 2 IS 144.5 FT. SE OF TRIANGULATION STATION BALD KNOB 1935, 6.8 FT. W OF A FENCE, A REFERENCE-MARK DISK, SET IN THE TOP OF A CONCRETE POST WHICH PROJECTS 0.6 FT. ABOVE THE GROUND, AND STAMPED BALD KNOB NO 2 1935.
01/01/1953 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1953 13.4 MI E FROM AUSTIN. 12.8 MILES EAST ALONG THE TEXAS AND NEW ORLEANS RAILROAD FROM THE STATION AT AUSTIN, THENCE 0.6 MILE NORTHWEST, ON TOP OF A HILL, 0.2 MILE NORTHWEST OF A FARMHOUSE, 0.15 MILE EAST OF A PRIVATE ROAD, 5 FEET SOUTH OF A FENCE, SET IN THE TOP OF A CONCRETE POST WHICH PROJECTS 0.5 FOOT ABOVE THE GROUND.
01/01/1957 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1957 (HJB) STATION AND REFERENCE MARKS RECOVERED IN GOOD CONDITION. THE AZIMUTH MARK IS LEANING ABOUT 20 DEG TO THE S BUT IS FIRMLY FIXED IN THE GROUND. DESCRIPTION IS ADEQUATE WITH THE EXCEPTION THAT STATE HIGHWAY 20 IS NOW U.S. HIGHWAY 290.
01/01/1961 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961 (GWM) THE STATION AND THE REFERENCE MARKS WERE RECOVERED AS DESCRIBED. THE DIRECTIONS AND MEASUREMENT TO REFERENCE MARK NO. 1 WERE CHECKED IN THE FIELD AND THEY DID NOT CHECK. THE MARK HAD BEEN DISTURBED. THE DIRECTION AND MEASUREMENT TO REFERENCE MARK NO. 2 WERE CHECKED IN THE FIELD AND THE MEASUREMENT DID NOT CHECK. THE MARK WAS IN GOOD CONDITION. THE AZIMUTH MARK WAS FOUND DESTROYED DUE TO EROSION AND A NEW AZIMUTH MARK WAS SET. A NEW TO REACH FOR THE STATION AND THE AZIMUTH MARK FOLLOWS. THE STATION IS LOCATED 22 MILES NORTHWEST OF BASTROP, 13 MILES WEST OF ELGIN, 10 MILES NORTHEAST OF AUSTIN AND 0.3 MILE SOUTH OF U.S. HIGHWAY 290. TO REACH THE STATION FROM THE MAIN ENTRANCE OF THE BERGSTROM AIR FORCE BASE, GO EAST ON TEXAS HIGHWAY 71 FOR 1.4 MILE TO THE JUNCTION OF FARM ROAD 973, TURN LEFT, NORTH, ON FARM ROAD 973 AND GO FOR 4.3 MILES TO A CROSSROAD AND INTERSECTION OF FARM ROAD 969, TURN LEFT, WEST, ON FARM ROAD 969 AND GO FOR 2.2 MILES TO DECKER LANE ROAD ON THE RIGHT, TURN RIGHT, NORTH, ON DECKER LANE ROAD AND GO FOR 4.8 MILES TO THE T INTERSECTION OF U.S. HIGHWAY 290, (TO REACH THE AZIMUTH MARK FROM THIS POINT, TURN LEFT, WEST, ON U.S. HIGHWAY 290 AND GO FOR 0.2 MILE TO THE AZIMUTH MARK ON THE RIGHT AS DESCRIBED,) TURN RIGHT, EAST ON U.S. HIGHWAY 290 AND GO FOR 0.55 MILE TO A SIDE ROAD RIGHT, TURN RIGHT, SOUTH ON THE GRAVEL ROAD AND GO FOR 0.4 MILE TO A LOCKED GATE AND END OF TRUCK TRAVEL. TO REACH THE STATION FROM THIS POINT, PACK EAST TO THE HIGHEST POINT OF THE HILL AND THE STATION AS DESCRIBED. A 5-MINUTE PACK. THE STATION MARK IS A STANDARD DISK SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT, WHICH PROJECTS 6 INCHES AND IS STAMPED BALD KNOB 1935. IT IS 6.3 FEET NORTH OF A METAL WITNESS POST AND 6 FEET SOUTH OF A EAST-WEST FENCE LINE. REFERENCE MARK NO. 1 IS A STANDARD DISK SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT, WHICH PROJECTS 7 INCHES AND IS STAMPED BALD KNOB NO 1 1935. IT IS 11.2 FEET SOUTH OF A EAST-WEST FENCE LINE. REFERENCE MARK NO. 2 IS A STANDARD DISK SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT, WHICH PROJECTS 6 INCHES AND IS STAMPED BALD KNOB NO 2 1935. IT IS 8 FEET WEST OF A NORTH-SOUTH FENCE LINE. THE AZIMUTH MARK IS A STANDARD DISK SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT, WHICH PROJECTS 3 INCHES AND IS STAMPED BALD KNOB 1935 1961. IT IS 150 FEET NORTH OF THE CENTER LINE OF U.S. HIGHWAY 290, 81 FEET NORTHWEST OF THE INTERSECTION OF TWO ROADS AND 6.1 FEET EAST OF A METAL WITNESS POST.
01/01/1964 by LOCSUR (GOOD)
RECOVERY NOTE BY LOCAL SURVEYOR (INDIVIDUAL OR FIRM) 1964 (IAM) RECOVERED BY CURTIS BRADEN. STATION AND AZIMUTH MARK WERE RECOVERED IN GOOD CONDITION AS DESCRIBED.
01/01/1967 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1967 (EBB) THE STATION MARK, REFERENCE MARKS NO. 1, NO. 2 AND THE AZIMUTH MARK WERE RECOVERED AND FOUND TO BE IN GOOD CONDITION. THE 1961 RECOVERY NOTE DESCRIPTION AND TO REACH THE STATION SITE ARE ADEQUATE FOR RECOVERY OF STATION. THE AZIMUTH MARK HAD TO BE SET IN A NEW LOCATION DUE TO ROAD IMPROVEMENTS. A NEW AZIMUTH MARK WAS SET OUT OF THE CONSTRUCTION AREA ON THE SAME AZIMUTH AS THE OLD AZIMUTH MARK. A DESCRIPTION OF THE NEW AZIMUTH MARK FOLLOWS--A STANDARD DISK, STAMPED BOLD KNOB AZ 3 1935 1967 IS SET IN A 12 IN X 12 IN CONCRETE POST WHICH PROJECTS 5 INCHES ABOVE THE SURFACE OF THE GROUND. IT IS ABOUT 0.55 MILE WEST OF THE STATION, ALONG THE NORTH RIGHT-OF-WAY OF U.S. HIGHWAY 290. THE MARK IS 150 FEET NORTH OF THE CENTER LINE OF U.S. HIGHWAY 290 WEST BOUND TRAFFIC LANE, 100 FEET SOUTHWEST OF THE CENTER LINE OF A BLACK-TOP ROAD, 1 FOOT EAST OF THE FENCE LINE, AND 1 FOOT NORTHEAST OF A METAL WITNESS POST. TO REACH AZIMUTH MARK FROM THE STATION, GO NORTH 0.4 MILE TO U.S. HIGHWAY 290. TURN LEFT, GO WEST ALONG THE HIGHWAY 0.75 MILE TO MARK ON THE RIGHT AS DESCRIBED. NOTE--THE OLD AZIMUTH MARK DISK WAS SALVAGED FROM THE CONCRETE POST. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--10 MILES EAST
01/01/1967 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1967 DESCRIPTION AND POSITION LISTED IN NGS QUAD 30097-3, STATION 1001. RECOVERED BY USGS IN 1954 AND REPORTED AZIMUTH MARK TILTED TO THE SIDE. RECOVERED BY NGS IN 1967. STATION MARK--STANDARD USC AND GS DISK STAMPED---BALD KNOB 1935---, SET IN TOP OF A CONCRETE POST, PROJECTING 0.5 FT. ABOVE GROUND.
01/01/1983 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1983 (RHK) STATION MARK, REFERENCE MARKS 1 AND 2, AND AZIMUTH MARK 3 WERE RECOVERED IN GOOD CONDITION. SHORTER MEASUREMENTS WERE NOTED TO BOTH REFERENCE MARKS, 0.0031 METER TO REFERENCE MARK 1 AND 0.022 METER TO REFERENCE MARK 2. A SHORTER DISTANCE OF 0.033 METER WAS NOTED BETWEEN THE REFERENCE MARKS. THE DIRECTION TO REFERENCE MARK 2 CHECKED THE 1961 DATA. A LARGER DIRECTION OF 2 MINUTES, 20 SECONDS WAS NOTED TO REFERENCE MARK 1. A LESSER DIRECTION OF 31 SECONDS WAS NOTED TO AZIMUTH MARK 3 AS COMPARED TO THE 1967 DATA. A COMPLETE DESCRIPTION FOLLOWS. THE STATION IS LOCATED 16 KM (10 MI) NORTHEAST OF AUSTIN, 0.6 KM (0.35 MI) SOUTH OF US HIGHWAY 290, ON A LOW PARTIALLY CLEARED KNOLL. OWNERSHIP--TAY W. BOND, 1911 LAKE SHORE DRIVE, AUSTIN, TX 78734, PHONE 512-327-3611. TO REACH THE STATION FROM THE JUNCTION OF US HIGHWAYS 183 AND 290 (JUST NORTHEAST OF AUSTIN), GO EAST ON HIGHWAY 290 FOR 4.65 KM (2.9 MI) TO A CROSSROAD (GILES ROAD). CONTINUE AHEAD FOR 2.3 KM (1.4 MI) TO A PAVED ROAD LEFT. (TO REACH THE AZIMUTH MARK, TURN LEFT, UPGRADE, FOR 75 METERS TO THE RIGHT-OF-WAY FENCE. TRUN LEFT ALONG THE FENCE FOR 30 METERS TO THE MARK). CONTINUE EAST ON HIGHWAY 290 FOR 1.05 KM (0.7 MI) TO A NARROW DIRT ROAD RIGHT. TURN RIGHT, SOUTHERLY, FOR 0.55 KM (0.3 MI) TO END OF TRUCK TRAVEL ABOUT 50 METERS BEFORE REACHING GATE AT TOP OF RISE. PACK NORTHEAST THROUGH PASTURE UP SLOPE OF HILL FOR ABOUT 0.2 KM (0.1 MI) TO HIGH GROUND AND STATION. THE STATION IS A STANDARD NGS DISK STAMPED---BALD KNOB 1935---, SET INTO THE TOP OF A SQUARE CONCRETE MONUMENT 30 CM ON A SIDE PROJECTING 15 CM ABOVE THE GROUND. IT IS LOCATED 1.70 METER (5.6 FT) SOUTH FROM WIRE FENCE, 1.95 METERS (6.4 FT) NORTH OF A METAL WITNESS POST. THE UNDERGROUND MARK IS A STANDARD NGS DISK STAMPED---BALD KNOB 1935---, SET INTO AN IRREGULAR MASS OF CONCRETE 1.5 METERS BELOW THE SURFACE. A STANDARD NGS DISK STAMPED---BALD KNOB NO 1 1935---, SET INTO THE TOP OF A SQUARE CONCRETE MONUMENT 30 CM ON A SIDE PROJECTING 15 CM ABOVE THE GROUND. IT IS LOCATED 3.2 METER (10.5 FT) SOUTH FROM WIRE FENCE, 3.0 METERS (9.8 FT) WEST OF A WIRE FENCE. MARK IS BELOW STATION 2.5 METERS. A STANDARD NGS DISK STAMPED---BALD KNOB NO 2 1935---, SET INTO THE TOP OF A SQUARE CONCRETE MONUMENT 30 CM ON A SIDE PROJECTING 15 CM ABOVE THE GROUND. IT IS LOCATED 2.6 METER (8.5 FT) WEST FROM A WIRE FENCE. MARK IS BELOW STATION 2.5 METERS. AZIMUTH MARK NUMBER 3 IS A STANDARD NGS DISK STAMPED---BALD KNOB AZ 3 1935 1967---, SET INTO THE TOP OF A SQUARE CONCRETE MONUMENT 30 CM ON A SIDE PROJECTING 2 CM ABOVE THE GROUND. IT IS LOCATED 45.7 METER (150 FT) NORTHWEST FROM CENTER OF EASTBOUND LANE OF HIGHWAY 290, 30.8 M (101.5 FT) SOUTHWEST OF CENTER OF PAVED ROAD, 0.55 M (1.8 FT) SOUTHEAST OF A WIRE FENCE, AND 0.4 M (1.2 FT) NORTHEAST OF A METAL WITNESS POST. HEIGHT OF LIGHT SHOWN ABOVE THE MARK WAS 1.5 METERS. DESCRIBED BY G. R. HEID
01/01/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (CAG) RECOVERED IN GOOD CONDITION.
01/20/1999 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1999 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in February 1996.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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