The Cascade Bridge, originally constructed in 1986, served as a vital connection until its closure to vehicles in 2008 and pedestrians in 2019. McClure, as the prime consultant alongside a team of subconsultants, was selected to provide survey and design engineering services. A comprehensive survey was essential to evaluate rehabilitation feasibility and deliver a data-driven foundation for design decisions.

Spanning a rugged ravine with steep slopes, dense vegetation, and rock faces, the bridge presented significant surveying challenges. To capture accurate terrain and structural data, our team combined traditional field methods with advanced technologies. UAS flights collected photos and LiDAR data to map the ravine, while terrestrial LiDAR scans using Trimble SX10 and X7 equipment provided precise details of the topography and bridge structure. A right-of-way survey established property limits prior to design.

Deliverables included Bentley OpenRoads Designer files for seamless design integration, a geo-referenced high-resolution aerial image, and detailed point cloud data of the bridge and ravine. This robust dataset ensures informed design decisions and supports the successful rehabilitation of this landmark structure.