ROCK ISLAND, Illinois. – Starting June 1, Starved Rock and Marseilles locks on the Illinois Waterway will be closed to commercial and recreational traffic from 6 a.m.to 6 p.m. to prepare for upcoming major maintenance. The 12-hour closures will take place daily from June 1 to July 3 and from July 8 to Aug. 16. Both locks will be open for normal, 24-hour operation July 3-7 to clear any backlog of traffic and accommodate for increased recreational boating during the Independence Day holiday.