Collamer is an unincorporated community in Cleveland Township, Whitley County, Indiana, United States,[3] located on the Eel River and at the intersection of Indiana State Road 14 and Whitley County road 900 W. Smith Rambo platted the town February 9, 1846.

These negotiations, led by Michigan Governor Lewis Cass, resulted in the Paradise Springs Peace Treaty.

The Miami, led by Chief Little Turtle before that point had their villages located on the Eel River between South Whitley and Columbia City, northeast of Collamer.

"[8] In the early 1870s the Detroit, Eel River & Illinois Railroad was built alongside the east side of Collamer and began operations in 1872.

The first dam was built in 1845 out of "wooden timbers with the chinks closed with packings of small sticks and straw," originally constructed to provide power for a gristmill.

Due in part to damage sustained in October 2019,[14] as well as ongoing safety concerns, including the death of a kayaker in 2017,[15] removal of the Collamer Dam began on January 8, 2020.