GT1565 "Q 803"
Located north of the town of Centerville, Fresno County, California, this USC&GS mark lies adjacent to Riverbend Avenue on the southeast head-wall of a bridge over the Enterprise Canal. Found USC&GS mark stamped "Q 803" at 13:50, 04 May 2019 as described and in generally good condition. The cap looks as though it has been hit many times with a hammer, but is still readable. Go to description is adequate to find the mark.
Published NAD83 coordinates are located about 50 feet east-northeasterly of the found WGS84 coordinates. WGS84 coordinates for the mark found by 4 minute occupation with 9 strong satellites and 1 WAAS satellite.
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Found Details for Benchmark: GT1565
N 36° 45.765 W 119° 30.660 (NAD 83)
Altitude: 429
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Published Details for Benchmark: GT1565
N 36° 45.767 W 119° 30.650 (NAD 83)
Altitude: 438.4
Coordinates may not be exact. Altitude is VERTCON and location is SCALED.
Location: In Fresno County, CA
Designation: Q 803
Marker Type: bench mark disk
Setting: massive structures
Stability: Probably hold position/elevation well.
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Documented History (by the NGS)
01/01/1947 by CGS (MONUMENTED)
01/01/1972 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1972 2.8 MI NW FROM CENTERVILLE. 1.15 MILES NORTH ALONG OLIVER AVENUE FROM THE JUNCTION OF STATE HIGHWAY 180 AT CENTERVILLE, THENCE 0.75 MILE WEST ALONG BELMONT AVENUE, THENCE 0.85 MILE NORTH ALONG RIVERBEND AVENUE, 0.4 MILE NORTH OF THE CROSSING OF A RAILROAD, AT THE CROSSING OF ENTERPRISE CANAL, IN THE TOP AND 2.0 FEET EAST OF THE WEST END OF THE SOUTH CONCRETE ABUTMENT OF A BRIDGE OVER THE CANAL, 22.2 FEET WEST OF THE CENTER LINE OF THE AVENUE, 6.5 FEET WEST OF A METAL GUARDRAIL, AND ABOUT LEVEL WITH THE AVENUE. SEC 31, T 13 S, R 23 E.
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| GT1565 "O 803" - Benchmark detail. |
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| GT1565 "O 803" - Benchmark and GPSr. |
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| GT1565 "O 803" - Benchmark setting. View northeast at the Riverbend Avenue Bridge over the Enterprise Canal. |
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| GT1565 "O 803" - Benchmark setting. View north along Riverbend Avenue. |
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| GT1565 "O 803" - Benchmark setting. View northwest along the Enterprise Canal. |
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| GT1565 "O 803" - Benchmark setting. View southerly along Riverbend Avenue over the Enterprise Canal. |
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| GT1565 "O 803" - Benchmark setting. View east along the Enterprise Canal across Riverbend Avenue. |
- The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
- 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 geoid height was determined by GEOID99.
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