For Michigan (if you cross at the bridge or tunnel this gives you about the first 50 miles) go to www.michigan.gov/mdot and click on the traffic link top left as I recall. From there you can see the construction and even view a section of the trip on camera.
I have traveled I-75 several times in the construction season and never had any problem.. in fact the only time there was a problem it was in a NON-Construction area (at least 50 miles from nearest construction) and the CB warned me about it so I took the last exit before the closure (2 fatal accidents) had dinner, a good night's sleep and continued on in the AM unimpeded.