The bridge on County Highway A (CTH A) over Spring Creek in the Town of Lanark has reached the end of its useful life. Although the exact age of the bridge is unknown, Portage County estimates it to be over 40 years old.
All three major inspection categories of this small 18-foot-long concrete bridge—the deck, superstructure, and substructure—have been rated in “poor” condition. Portions of the concrete deck have chipped off, exposing the rebar that provides structural reinforcement. In addition, the flow of the creek is beginning to affect the footings, and due to the unknown design, this could impact the structure’s stability.
Beyond its poor condition, the bridge, which has a narrow width of just 25 feet, is inadequate for the amount and type of traffic on CTH A.
CTH A is classified as a Major Collector and carries approximately 940 vehicles daily, according to 2021 WisDOT traffic counts. It is a vital link between the towns of Lanark and Amherst and the Village of Amherst and is a critical regional connection between USH 10 and STH 54. It is also a route to many local businesses, including a brewing company, the Amherst Wastewater Treatment Plant, plumbing and heating services, building supplies, and other destinations. Furthermore, the route supports multiple agricultural operations in the area.
Portage County has applied twice for state-administered federal funds (STP-R) to resurface CTH A and replace the bridge over Spring Creek. However, competition for these funds is fierce, and the county has been unsuccessful in securing financing.
If the structure’s condition continues to deteriorate, it may become necessary to post load restrictions or fully close the bridge. Such an action would result in an onerous 7-mile detour on county roads built to a lower standard and which includes many vertical and horizontal curves.
CTH A over Spring Creek from the East
The stream is eroding the corner of the structure.
A section of the foundation is uncovered.
Concrete damage is visible on the support structure.
