Coralville Lake is a Reservoir in Johnson, Iowa.

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Coralville Lake is a reservoir formed by Coralville Dam, a dam on the Iowa River just upstream from the city of Coralville, Iowa. Construction started in 1949, was delayed by the Korean War, and finally finished in 1958. The dam was built as a flood control project by the United States Army Corps of Engineers, and the lake has a capacity of 461,200 acre·ft (568,900,000 m3).

The lake and surrounding lakeshore have been extensively developed for recreational use.

Water first flowed over the 712-foot (217 m) emergency spillway on July 5, 1993 (see Great Flood of 1993), reaching a then-record crest. The record was surpassed by the June 2008 Midwest floods. Water again flowed over the 712-foot (217 m) emergency spillway on June 12, 2008, and the reservoir crested at 717 feet (219 m) early in the morning on June 15, 2008.

Lake Macbride is formed by another dam just up from the Coralville reservoir. This dam was overtopped by in the flood of 2008, and the lake effectively became part of Coralville Lake.