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Technical Meetings


UPCOMING MEETINGS

May 29, 2025: Rehabilitation of the Historic Keystone Arch Bridge

Virtual Meeting (1 PDH)

Date & Time:

Thursday, May 29, 2025

12:00PM to 1:00PM Virtual Presentation

Topic:

Rehabilitation of the Historic Keystone Arch Bridge

Location:    

Presentation link to be provided to registrants

Register for this month's meeting HERE!

Fees:

$15 - Members & Non-Members

                PLEASE RSVP BY MAY 28, 2025 at 5:00PM

Description:

The historic Keystone Bridge in Elkader, Iowa, was built in 1889 and is one of the largest and
best constructed twin arched stone bridges in the Midwest United States. Continuing material
deterioration and the appearance of longitudinal cracks in the arches prompted a low load
posting. In 2015, the City of Elkader initiated plans for what was set to be the most extensive
rehabilitation of the bridge since its construction in 1889. After a successful rehabilitation
project, the iconic bridge at the heart of the City of Elkader’s historic district was rededicated in
2024—the 135th anniversary of its original construction—and will continue to serve the city for
many years to come. This presentation provides an overview of the structural evaluation
methods, analysis techniques, and repair and strengthening strategies of stone arch bridges,
with particular emphasis on the approach used for the rehabilitation of the Keystone bridge.

Join us to learn more!

Presenters:

Mr. Carlo Citto, PE

Mr. Citto is a Structural Engineer and Principal at Atkinson-Noland & Associates. He has over

15 years of experience in structural analysis and load rating of stone arch bridges and has been

involved in the rehabilitation of many historic arch bridges throughout the country. He has also

worked on numerous projects involving nondestructive evaluation, strengthening design, and

finite element analysis of masonry structures.

Questions:

Please email phillysei@gmail.com


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