Historic

Harquahala Peak Observatory

La Paz County, AZ

Coordinate verified

Ruins of a 1920s Smithsonian Astrophysical Observatory solar-radiation station on the 5,681-ft summit of Harquahala Mountain—highest peak in southwestern Arizona—reached via BLM Harquahala Mountain Back Country Byway (high-clearance/4WD) or the steep Harquahala Pack Trail. Wide desert views over the Harquahala Plain and adjacent wilderness.

Field facts

RegionLa Paz County, AZ
Coordinates33.8111, -113.3466
Era1920s Smithsonian solar observatory
Summit elev.~5,681 ft
AccessBLM byway / pack trail from Aguila–Wenden side
NearbyAguila / Wenden / Alamo Lake SP

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Public recreation data — BLM & Recreation.gov (RIDB). Verify current access, fees, and seasonal closures before traveling.

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