Coralville lake elevation versus day of 2004
The large rise in the lake level that is seen here is due to a reduction in the flow of the Iowa River from 6000 to 1000 cubic feet per second for 3 days. This was done to reduce the crest of a Cedar River flood where it joins the Iowa. Combine this with Coralville Lake inflows up to 15,000 cubic feet per second and one can see why the lake filled so rapidly.

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