The art and archaeology museums at the University of Michigan are in line for $46 million in improvements.
The separate expansions are designed to give the school's collections a better display and draw more visitors.
More than 100,000 artifacts and works of art have been locked in storage for decades because of limited space at both museums.
Officials say the crunch should ease considerably when the construction starts in 2006.
Most of the money raised the expansions is from donations.