Grand Avenue Bridge Replacement

Grand Avenue over Des Moines River Bridge


The Grand Avenue Bridge was constructed in 1918 and last rehabilitated in 1968. The structurally deficient, scour-critical bridge has experienced an increase in the rate and the magnitude of deterioration over the years. Components of the bridge are severely deteriorated, resulting in significant concrete spalling, cracking, and delamination. The existing bridge will be completely removed and replaced.

The new bridge will be a 446 ft., four-span, concrete beam bridge with concrete stem piers and integral abutments, all with driven or drilled steel piling into bedrock. The new bridge will have one less river pier than the existing bridge and will improve the bridge river hydraulics. The bridge will support three lanes of traffic (2-WB, 1-EB), a westbound bicycle lane, and curb parking on the south side only. The bridge sidewalks will be widened to 14 ft. on both sides. The bridge will feature a painted metal panel arch façade and will incorporate minor aesthetic lighting to enhance the new bridge.

The bridge will be closed to all traffic during construction and a detour route will be signed. In addition, there will be some trail and sidewalk closures on the west side at the Principal Riverwalk, which will also require a detour route.


Bridge utility relocation work is ongoing/underway
June 2016 - IDOT Bidding
July 11, 2016 - City Council approves Construction Contract
September 2016 - Anticipated Construction Start
September 19, 2016 – Grand Avenue Bridge and Riverwalk Trails adjacent to bridge closed
December 2017 – Grand Avenue Bridge open to traffic
Summer 2018 – Project Complete



Cramer & Associates, Inc.
3100 SW Brookside Drive
Grimes, Iowa 50111


Please contact us by email or call 515-283-4920.

Project Updates (7)

Grand Ave. Bridge - 3-28-17 Construction Progress Update
by B. Cole on March 28, 2017 The contractor is continuing to make good progress during March.  Pier #2 was completed with the temporary cofferdam removed.  A new temporary bridge was installed to help with river flows for contractor to access area to remove the last pier from the old bridge and begin cofferdam construction for the last new pier.  Twelve (12) 100 ft. concrete beams were set in the west end span and twelve (12) 120 ft. concrete beams were set in the west interior span.  Check out a few Progress Photos HERE.
Grand Ave. Bridge - 3-6-17 Construction Update
by B. Cole on March 06, 2017

Construction is approximately 40% complete for the new bridge construction.  The abutment caps are complete at both the west and east abutment.  Pier #1 is complete.  Pier #2 is scheduled to be complete by the end of the week and then work will shift to constructing Pier #3.  The new concrete beams have been fabricated with the first batch staged for shipment to the site, when the contractor is ready to begin setting them in place.  Construction progress photos are attached HERE.

Grand Ave Bridge - 1-6-17 Construction Progress
by B. Cole on January 06, 2017

Construction is continuing to progress, despite the cold weather.  The contractor has completed pile driving on the west pier and has poured concrete for the west pier footing.  They are now working on the pier stem wall forming and then will transition to pile driving and footing construction on the center pier.  Concurrently, the east abutment continues to have reinforcing steel and formwork placed for the abutment pedestal.  See attached progress photos HERE.

Grand Ave - Construction Progress update
by B. Cole on December 07, 2016

Bridge demolition has been progressing well. Approximately 70% of the existing bridge has been removed. The contractor has recently completed driving new steel piles at the east abutment. The steel sheet-pile cofferdam is well under construction for the new west pier and the contractor will begin excavating for the new pier foundation prior to driving new piling. The attached .pdf includes some recent progress photos.

Grand Ave. Bridge --11-3-16 Demolition progress
by Ben Cole on November 03, 2016

Attached are a couple demolition progress photos, .pdf file.

Demolition progress photos
by Ben Cole on October 05, 2016

Demolition is underway! Included here are a few demolition progress photos.

Grand Avenue Bridge Set to Close September 19
by Ben Cole on September 19, 2016

Effective Sept. 19, Grand Avenue between 2nd Avenue and Robert D. Ray Drive has been closed to all traffic with signed detour routes available. The signed detour route uses Walnut Street, although other downtown bridges will remain open. Detour signage is also available for the Principal Riverwalk, as portions of that trail are closed for the bridge construction. The new bridge is expected to be open to traffic in late 2017.

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