| Go to the Iowa Research Online site to read more about The Origin & History of Extinct Lake Calvin by Walter H. Schoewe |
| Location of Extinct Lake Calvin Geographically extinct Lake Calvin lies in the southeastern part of Iowa. The site of this former expanse of water, as can be seen above, is confined primarily to an area lying roughly parallel to the Iowa and Cedar rivers, from Iowa City and Moscow in Johnson and Muscatine counties respectively in the north, to Columbus Junction, Louisa county, in the south.. |