Mound 1 was partially excavated in the mid to late 1950s by Charles H. Fairbanks and Hale G. Smith for the Department of Anthropology at Florida State University.
All information from the excavation except for a single photo and a partial list of artifacts found are currently missing and presumed lost.
Mound 1 is the only mound not currently located within the boundaries of the park and remains privately owned.

Mound 4 was built between 1250 and 1400.
It was started when a layer of white sand was laid down over a previous habitation area and covered with 60 centimetres (2.0 ft) of basket-loaded mound fill and covered with a red-clay cap.
It had several more similar construction phases.
A series of postholes were discovered at the summit by John Griffin in 1947, but due to time constraints with the work season he could not proceed any further.

Mound 5, the smallest mound at the site, went through at least two phases of mound construction.
It was built over a former village area but did not receive a coat of white sand before mound construction as did Mound 4.
It seems to have been abandoned sometime during the Late Lake Jackson phase.

Mound 6 was also built on top of an earlier habitation area, and was also given a layer of light-colored sand before the mound was started.
Several layers were added over the years and evidence for habitations structures was found on the successive summits.
Artifacts found in the mound date to 1250 to 1400, during the Late Lake Jackson II phase.

Mound 7 has never been excavated and has almost nothing known about it.
Its seriously degraded shape does not even permit its identification as a platform mound with certainty.
Mound 1 was partially excavated in the mid to late 1950s by Charles H. Fairbanks and Hale G. Smith for the Department of Anthropology at Florida State University. All information from the excavation except for a single photo and a partial list of artifacts found are currently missing and presumed lost. Mound 1 is the only mound not currently located within the boundaries of the park and remains privately owned.
Mound 4 was built between 1250 and 1400. It was started when a layer of white sand was laid down over a previous habitation area and covered with 60 centimetres (2.0 ft) of basket-loaded mound fill and covered with a red-clay cap. It had several more similar construction phases. A series of postholes were discovered at the summit by John Griffin in 1947, but due to time constraints with the work season he could not proceed any further.
Mound 5, the smallest mound at the site, went through at least two phases of mound construction. It was built over a former village area but did not receive a coat of white sand before mound construction as did Mound 4. It seems to have been abandoned sometime during the Late Lake Jackson phase.
Mound 6 was also built on top of an earlier habitation area, and was also given a layer of light-colored sand before the mound was started. Several layers were added over the years and evidence for habitations structures was found on the successive summits. Artifacts found in the mound date to 1250 to 1400, during the Late Lake Jackson II phase.
Mound 7 has never been excavated and has almost nothing known about it. Its seriously degraded shape does not even permit its identification as a platform mound with certainty.
Lake Jackson Mounds Archaeological State Park