Girl witnesses crime by police(person of authority)

I watched this movie in the 90s(in color) so I believe it to be a 80s/early90s movie.  The girl  traveled  along the Mississippi(I think) after seeing a person of authority committing a crime.  I remember fireworks?  She may have been chased by them across the Mississippi or just left the area cause she couldn’t trust anyone-possibly a boy with her.

Thanks in advance for any ideas.

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