Major Features: A riverside levee reduces sediment input into the lake. Two interior closures were installed to divide the lake into three independently managed units. Islands were constructed to protect the area from waves and current. Pumps and water control structures were installed to re-create historic water-level variations; and deep-water habitat was created for fish Spotlighted Species: Waterfowl & shorebirds Interesting Facts: Swan Lakes contains 3,000 acres and is the largest backwater lake on the lower Illinois River, providing some of the most important wetland habitat in the region for migratory birds and big river fish.