Passed 3 of these yesterday

[BHD]

I think there temporary bridge sections,
7NEWS - Temporary bridges to replace washed-out spans can be erected in less than 4 days, contractor says - Local Story

Emergency Bridge Replacement & Repair | Mabey Inc.

 

[bcp]

it looks like the bridges the DNR uses around Wisconsin for snowmobile and hiking trails.

Here is another WI bridge like that one.

Reconstruction

Bruce