City of Brooklyn – Mill Street Bridge Over Little Bear Creek

The project included replacement of an existing 43’ x 20’ steel thru girder bridge with a 140’-0 x 24’-6 continuous concrete slab bridge and placement of approximately 1400’ of PCC paving.  Storm sewer, water main relocation, driveway and dike reconstruction were also part of the project.

In order to meet Iowa DNR freeboard criteria, the approach roadway had to be raised nearly 8’, necessitating horizontal realignment of the roadway in order to eliminate impacts to an adjacent City sanitary lift station.  Revetment key trenches were installed beneath the bridge to mitigate slope stability concerns and reduce bridge length.

In addition to a portion of the cost of construction, the City successfully requested that design engineering be an eligible project expense under the Federal Highway Bridge Replacement and Rehabilitation Program administered by the Iowa Department of Transportation. The City also entered into a 28E Agreement with Poweshiek County who provided the necessary construction observation and administration for the project.