The first excavations in the castle were performed in 1878-1879.

Full excavations were performed in 1952-1953, after which the chamber was re-roofed with concrete and covered with turf to resemble the original structure.

An additional excavation was performed in 1962 by the National Park Service to a depth of 10.5 feet (3.2 m).

Prior to the dam being built in 1941, an excavation was performed at the homestead site.

The only excavation on the mesa had been performed by animals.

The complete excavation of the block containing the remains was performed on 6 August.

Archaeological excavations organised in the 1970s were performed on the castle ground.

Until an excavation is performed and evidence is unearthed, one can only speculate.

Extensive excavation and general protection of sites and conservation-restoration works were performed in the period 1970-1978.

The French left in 1833; meanwhile, only exploratory excavation had been performed.