There are ENGINEERS and BIOLOGICAL SYSTEMS RESEARCHERS who are sufficiently trained that they can be brought in to inspect specific characteristics of riverine environments as well as the structures thereon ~ for instance, you can bring in fresh water biologists to check wear rates on rock supporting or surrounding pilings. You can use any civil engineer to check a crack. You can use any structural engineer to do a test on concrete to see if it's still physically intact.
A surveyor can see if the bridge is still upright!
When your bridge has been whacked by a river barge (ever see one of those ~ they're huge) I am sure astute politicians make sure the potential inspectors are ready to jump on top of it.
“who are sufficiently trained that they can be brought in to inspect “
Uh huh. Brought in by who? Or are they just out “walking the earth” and looking to right the crack-challenged structures of the earth?