Lake Springfield is a 4,260-acre (17.2 km2) reservoir on the southeast edge of the city of Springfield, Illinois. It is 560 ft (170 m) above sea level. The lake was formed in 1931–1935 by building Spaulding Dam across Sugar Creek, a tributary of the Sangamon River. Lake Springfield can be seen from Interstate 55. The limited-access highway crosses the lake on two bridges between mileposts 88 and 89. The lake is accessible from exit 88 (East Lake Shore Drive), exit 90 (Toronto Road), and exit 94 (Stevenson Drive).