The crew of the Coast Guard Cutter Sledge, a 75-foot Inland Construction Tenders based out of Baltimore, Maryland, finish a day of aids to navigation work on the Delaware River near Philadelphia, April 19, 2017. Coast Guard photograph by Petty Officer 2nd Class Daniel Scott.

USCGC Sangamon returns home to East Peoria, Ill., from a buoy trip on the Illinois River. (U.S. Coast Guard photo)

USCGC Sangamon is underway working aids to navigation on the Illinois River near Grafton, Ill. (U.S. Coast Guard Photo by SN Shelby Dolby)

USCGC Sangamon is underway on the Illinois River near Ottawa, Ill. (U.S. Coast Guard Photo by SN Shelby Dolby)

USCGC Sangamon meets traffic while underway on the Illinois River near Marseilles, Ill. (U.S. Coast Guard photo)

The Coast Guard Cutter Sangamon departs her homeport in East Peoria, Ill., to assess damages to Aids To Navigation on the Illinois River following record flooding in December and January 2016. (U.S. Coast Guard photo by Fireman Andrew Jackson)