32 Discovery Dr.
Bozeman, MT 59718


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Black Butte Ranch Bridge Replacement

Black Butte Ranch Bridge Replacement

AESI designed and permitted a bridge replacement project on the West Gallatin River that spanned both Yellowstone National Park and a private ranch. An 80-foot long steel bridge replaced an existing wood bridge with a hydraulic opening width of only 39-feet. The new wider span provided additional hydraulic capacity in addition to improved river function. AESI collaborated with the Owner to successfully permit the project with the Gallatin Conservation District and the National Park Service. AESI’s scope of work included:

  1. Site reconnaissance and topographic survey
  2. Hydraulic model completed with HEC-RAS
  3. Bridge scour analysis
  4. Geotechnical engineering
  5. Geometric design of precast abutments, pre-fabricated steel bridge, and channel revetment
  6. Permitting
  7. Construction engineering