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on
December 1, 1944. On April 24,1962, the monument was re-established by Leonard W. Murphy, based on the Ty White's field notes, because the previous monument had been vandalized. On April 26, 1984, Paul L. Reeves and John P. Bennet re-monumented the original corner. On February 19, 2006, the initial point was again re-monumented due to deterioration of the 1985 plaque. This re-monumentation was performed by staff from the BLM, members of the Arizona Professional Surveyors Society, and students at Phoenix College. The initial point was added to the
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The original marker was set in 1851 by John R. Bartlett. In 1934, the U.S. Coast and
Geodetic Survey set triangulation station "INITIAL" approximately 15 feet from the initial point. Ty White, Associate Cadastral Engineer for the U.S. Bureau of Land Management (BLM), re-monumented the initial point
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used. The angle between the 1984/2006 marker and the 1931 marker is at an azimuth bearing of 292°, aka 68° west of due north. The location is immediately east of
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U.S. Department of the
Interior Bureau of Land Management. Initial Point of Establishment in 1865. Gila and Salt River Meridian, Arizona. Cadastral Survey.
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Marker of the initial point of the Gila and Salt River
Meridan on Monument Hill in Avondale. The following is engraved on the round marker:
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is 12° east. It is located on
Monument Hill, an easily visible hill just south of the confluence of the Gila and Salt Rivers, in
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157:(listing #02001137) as of October 15, 2002. The plaque for that listing was installed as part of the 2006 re-monumenting.
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172:(formerly Phoenix International Raceway) and the western side of Monument Hill is terraced for low-priced race viewing.
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Dedicated to all land owners in
Arizona by the Arizona Professional Land Surveyors originally set by A. B. Gray in 1851
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units give a reading of 33° 22.631′ N latitude and 112° 18.366′ W longitude due to the specific
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Map of Gila Valley, Arizona USGS indicating Gila and Salt River initial point, meridian and baseline
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311:"Initial Point of the Gila and Salt River Base Line and Meridian - Avondale, AZ"
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List of principal and guide meridians and base lines of the United States
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U.S. Geological Survey
Geographic Names Information System: Initial Point
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List of principal and guide meridians and base lines of the United States
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221:"History of Arizona, Vol. IV, Chapter XVI. Early Surveys"
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intersects the initial point on the south side of the
294:. Arizona Professional Land Surveyors. Archived from
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202:Plane Surveying for Use in the Classroom and Field
629:Historic surveying landmarks in the United States
260:. U.S. Bureau of Land Management. Archived from
258:"Cadastral Survey: Gila and Salt River Meridian"
93:Initial point of the Gila and Salt River Meridan
46:but its sources remain unclear because it lacks
614:Meridians and base lines of the United States
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243:"Gila and Salt River Meridian, Avondale, AZ"
105:The rectangular marker states the following:
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77:Learn how and when to remove this message
279:. The Center for Land Use Interpretation
16:Surveying line in Arizona, United States
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155:National Register of Historic Places
223:. The University of Arizona Library
160:For the 1984/2006 marker, handheld
208:. New York: American Book Company.
137:. The current declination for the
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277:"Gila and Salt River Meridian"
199:Raymond, William Galt (1914).
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245:. Principal Meridian Project
123:Gila and Salt River Meridian
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590:33.3771694°N 112.3061722°W
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292:"Arizona's Initial Point"
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182:Baseline Road (Arizona)
61:more precise citations.
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624:Geography of Arizona
363:of the United States
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361:Principal meridians
369:Numbered meridians
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315:. Retrieved
300:. Retrieved
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266:. Retrieved
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247:. Retrieved
225:. Retrieved
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53:Please help
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593: /
522:Tallahassee
422:Black Hills
59:introducing
608:Categories
552:Wind River
547:Willamette
542:Washington
492:New Mexico
462:Huntsville
317:2012-09-24
302:2012-09-24
283:2012-09-24
268:2012-09-24
249:2012-09-24
227:2012-09-24
193:References
131:Salt River
127:Gila River
512:Salt Lake
472:Louisiana
432:Chickasaw
67:June 2014
477:Michigan
457:Humboldt
442:Cimarron
176:See also
497:Montana
437:Choctaw
147:Phoenix
135:Arizona
55:improve
527:Uintah
487:Navajo
467:Indian
391:Fourth
381:Second
532:Umiat
427:Boise
406:Sixth
401:Fifth
386:Third
376:First
166:geoid
40:, or
121:The
537:Ute
162:GPS
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