Bridges & Structures

Monarch Highway Bridges - Interstate 35 Ankeny to Ames Corridor

Pier brick pattern example

Interstate 35 travels through Minnesota, Iowa, Missouri, Kansas, Oklahoma, and Texas. In 2016, these 6 states and the Federal Highway Administration signed a Memorandum of Understanding pledging to collaborate on best practices in right-of-way and other land management in support of pollinators and to increase public awareness of their role.

The I-35 route was named the Monarch Highway to celebrate the amazing and iconic butterfly species and its exceptional annual two-way migration, a critical part of which occurs along this route.

Brick pattern at HOINT trail tunnel

The integral veneer brickwork on the new overhead bridges will reinforce the Monarch Highway theme with its design features. In total, 7 bridges will be replaced in the Ankeny to Ames corridor, and each central supporting pier of those bridges will contain a unique illustrative closeup view of the Monarch’s wing pattern. The bricks portray individual wing scales, and the multiple brick colors recall the Monarch’s pigmentation in a sustainable way.

The abutment bricks illustrate a Monarch caterpillar as well as binary code. The 7 bridges will spell out “Monarch Highway” on the west and east ends of the bridges for both northbound and southbound I-35 using this “binary caterpillar” font.


Monarch Caterpillars with a Message

Each bridge has multi-colored brick “caterpillars” displayed at each corner. The caterpillars are also binary codes (the zeros and ones of common computer language) corresponding to letters. Together, the 7 new bridges between Ankeny and Ames will spell out “Monarch Highway” on the left and right sides of the bridges, for both northbound and southbound directions.


Monarch Highway Facts

  • Iowa has 218 miles of Interstate 35, or about 14% of its 1565-mile total length.
  • Current annual average daily traffic is over 45,000 vehicles per day.
  • At a vehicle occupancy rate average of 1.64 to 1.68, that’s roughly 73,000 people per day passing through this section of Interstate 35.
  • The estimated annual average daily traffic in 2045 is 103,000 or roughly 173,000 people per day.

Monarch Butterfly and Monarch Highway Inspirations



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