Rainbow Springs has served 
as an important natural resource for humans and animals for many years. 
At one time, mastodon and mammoth fossils were found in the Rainbow 
River, along with relics of the Timucua who used the river for 
transportation and fishing.
Much later, In the early 20th
 century, the surrounding area was mined for phosphate. The raw industry
 brought a boom and the towns of Juliette and Dunnellon were founded. 
Juliette, once located on what is now the park property, no longer 
exists.
In the 1930’s, Rainbow 
Springs became a privately-owned theme park. In that time, most Florida 
spring-based parks had glass bottom boats. Rainbow Springs featured 
distinctive sub-boats which had stairs that went below the waterline so 
that visitors could look out at eye level. Waterfalls were built on 
piles of phosphate tailings, and a zoo, rodeo, gift shops and a monorail
 with leaf-shaped gondolas were also added.
The
 development of the Interstate highway system eventually led to the 
demise of the theme park as the interstate passed by other, newer 
attractions and drew people away from the older parks. Rainbow Springs 
theme park closed in 1974. The Citizen’s Support Organization, called 
Friends of Rainbow Springs (FORS), led the way to bringing the park back
 to life and today the Rainbow River is a designated National Natural 
Landmark, an aquatic preserve and an Outstanding Florida Waterway.