23 developed recreation sites along 314 miles of the Mississippi River between Petosi, WI and Saverton, MO. There are several campgrounds and numerous day use sites. The more popular sites are Grant River, Blanding Landing, Pleasant Creek, Bulger's Hollow, Thomson Causeway, Fisherman's Corner, Clark's Ferry, Shady Creek and Blanchard Island. The Mississippi River Visitor's Center is located on Arsenal Island in Rock Island, Illinois at Locks and Dam 15, overlooking the Upper Mississippi River. Visitors can watch a locking procedure and view exhibits all about navigation on the river. The center welcomes over 60,000 people annually and is handicap accessible. From early April through mid-December visitors from around the world come to the visitor's center to watch boats pass through the lock. The visitor's center is open seven days a week with the exception of Christmas and New Year's Day.