Gilbertville Bridge Widening
LocationBlack Hawk County
Several options were considered to upgrade the existing 40-year-old bridge and link it to the county bike trail system. An innovative design reduced costs and construction time while maintaining traffic through the site:
- Re-use of existing pier stems and footings and adding post-tensioned caps eliminated cofferdams and expensive new pier construction.
- Respacing/strengthening existing beams and adding new heavy rolled sections improved load capacity, dynamic response and bridge width.
- Staged construction allowed traffic to be maintained. The sidewalk was designed for temporary vehicle traffic during Stage II, with open concrete rail retrofit after 2-way traffic was restored.
With appropriate maintenance, the new high-density concrete deck and AASHTO-rated railing upgrade will serve Black Hawk County well into the 21st Century.
>>Download a pdf of this project sheet