Cedar Creek (from Potawatomi: mskwawak-zibə)[1] is the largest tributary of the St. Joseph River, draining 174,780 acres (707.3 km2) in the Eastern Corn Belt Plains of northeastern Indiana.
[3] Blockage of the Eel's channel by outwash from the canyon and a decline in the volume of meltwater caused lower Cedar Creek to reverse its flow.
In so doing, it captured the flow of the upper Eel, a classic example of stream piracy that shifted Cedar Creek's drainage (about 175,000 acres) from the Eel-Wabash system to that of the St.
[4] Once a meandering stream, upper Cedar Creek was channelized (straightened and deepened) in the early 20th century for agricultural and urban drainage, which has increased the watershed's vulnerability to erosion and contaminated runoff.
[6] Its DeKalb County section flows east-southeast from Indian Lake, loops around Waterloo, passes through Auburn, then angles southwest until it enters Allen County, where it is crossed by Indiana State Road 327 south of Garrett before turning back to the southeast toward Leo-Cedarville.