Welcome to Materials Approved Product List Enterprise (MAPLE)
MAPLE contains a searchable database of most of the approved products, sources, producers,
and suppliers of materials for Iowa highway projects. MAPLE may be searched by the brand/product name, producer, Materials Instructional Memorandum (IM) number, or material name. New approvals are continually added as they
become approved for use. For the products and sources that are not in the database,
they can be found at:
if you have questions or need assistance.