“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Near Iowa City in Johnson County, Iowa — The American Midwest (Upper Plains)

The Coralville Dam

The Coralville Dam Marker image. Click for full size.
Photographed By Connor Olson, July 25, 2020
1. The Coralville Dam Marker
Inscription.  Construction of the Coralville Dam complex by the U.S. Army Corps of Engineers was completed in 1958, and designed primarily for flood control. Lake levels are regulated routinely by adjusting the outflow into the Iowa River through gates near the east end of the Dam. The maximum dis- charge capacity is 20,000 cubic feet per second.

The Emergency Spillway abuts the west end of the Dam and is 500 feet wide with its lip 31 feet below the Dam's crest. The Spillway's purpose is to release flood water that other- wise would exert excessive pressure on the main dam structure.

The capacity of the Coralville Reservoir is over 15 billion gallons of water enough to supply water for Iowa City and Coralville for over five years.
Topics. This historical marker is listed in this topic list: Waterways & Vessels. A significant historical year for this entry is 1958.
Location. 41° 43.306′ N, 91° 31.93′ W. Marker is near Iowa City, Iowa, in Johnson County. Marker can be reached from Prairie Du Chien Road Northeast. Touch for map. Marker is at or near this postal address: 2850 Prairie Du Chien Rd NE, Iowa City IA 52240, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers

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are within 4 miles of this marker, measured as the crow flies. An Ancient Sea (here, next to this marker); Devonian Fossils (a few steps from this marker); Site Geology (a few steps from this marker); View from the Overlook Plaza (a few steps from this marker); Samuel Jordan Kirkwood (approx. 3.9 miles away); Old Brick (approx. 4 miles away); Mormon Handcart Brigade Camp (approx. 4.1 miles away); St. Mary's Church (approx. 4.1 miles away). Touch for a list and map of all markers in Iowa City.
Coralville Dam Emergency Spillway image. Click for full size.
Photographed By Connor Olson, July 25, 2020
2. Coralville Dam Emergency Spillway
Credits. This page was last revised on June 7, 2021. It was originally submitted on June 6, 2021, by Connor Olson of Kewaskum, Wisconsin. This page has been viewed 222 times since then and 5 times this year. Photos:   1, 2. submitted on June 6, 2021, by Connor Olson of Kewaskum, Wisconsin. • Mark Hilton was the editor who published this page.
Editor’s want-list for this marker. A wide shot of the marker and its surroundings. • Can you help?

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Mar. 4, 2024