Residents evacuated in Nashville, Illinois after dam overtops and floods amid heavy rainfall

[Murph 9000]

Here we go again. 90 year old earthen dam, with what looks to be a quite small and vulnerable spillway, that is overtopping and warnings of imminent failure.

USA Today
Google Maps

 

[FacEngrPE]

Risk of Illinois dam breach is under control after once-in-a-century rainfall, officials say Updated 10:04 PM EDT, Tue July 16, 2024

https://www.cnn.com/2024/07/16/us/nashville-illinois-dam-break/index.html[/URL]]After water overtopped a reservoir dam and forced residents of a small Illinois city to evacuate Tuesday morning amid fears the structure could rupture, local officials now say the situation is under control.

Drone video: Dam failure in Nashville, Illinois, after several ...YouTube KSDK News Jul 16, 2024
In this case the emergency spillway was present and appears to have worked as intended.

 

[FacEngrPE]

https://www.kwqc.com/2024/07/17/amid-heavy-rainfall-southern-illinois-nashville-dam-system-breached-hundreds-evacuated/[/URL]]The 90-year-old city reservoir, which provides Nashville’s drinking water, includes a main dam with a spillway and a secondary earthworks dam. The design allows water to breach the secondary dam, diverting overflow to protect the main dam, said Alex Haglund, a spokesperson for the Washington County Emergency Management Agency. The “fuse plug” spillway that activates during high water levels directs water along a designated emergency path, IDNR added.

After action report July 19;

https://www.msn.com/en-us/news/us/e...eed-for-modernized-infrastructure/ar-BB1qevkL

Video July 19 KSDR -

https://www.msn.com/en-us/video/new...xperts-say/vi-BB1qgCjQ?t=135&ocid=socialshare

Conclusion - the emergency spillway worked, during a rain event that appears to have significantly exceeded the main spillway capacity. Given the dam is 90 years old, I give the owners a "Good Job".