Historic
La Paz County, AZ
Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
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.
| Region | La Paz County, AZ |
|---|---|
| Coordinates (approx.) | 33.8111, -113.3466 |
| Era | 1920s Smithsonian solar observatory |
| Summit elev. | ~5,681 ft |
| Access | BLM byway / pack trail from Aguila–Wenden side |
| Nearby | Aguila / Wenden / Alamo Lake SP |
Public recreation data — BLM & Recreation.gov (RIDB). Verify current access, fees, and seasonal closures before traveling.
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Plan ahead. Leave no trace. Verify current access before traveling.