The spring weight restrictions continue to be lifted. MDOT has released Bulletin #6, which announces that, effective Monday, April 6, "weight restrictions will be lifted on all state trunkline highways from the southern Michigan border north to and including I-96 at US-31 Muskegon east to I-69 Lansing east to the Blue Water Bridge, Port Huron."
For county-specific weight restriction information, see the County Road Association of Michigan website at http://www.micountyroads.org/weight.php
Also, you can call the MDOT Spring Weight Restriction hotline at 800-787-8960.
To download or order printed copies of the 2015 MDOT Truck Operators Map, visit http://www.michigan.gov/mdot/0,4616,7-151-11151_11033_32060---,00.html