Tatham Engineering was retained by the County of Simcoe to deliver full engineering services for the rehabilitation of the Weatherall Bridge on County Road 9. Our scope included a Schedule A+ Municipal Class Environmental Assessment, enhanced OSIM inspection, detailed deck condition survey, preliminary and detailed design, preparation of contract documents for tendering, and full construction-phase services.

Constructed in 1981, the single-span cast-in-place concrete rigid frame bridge had experienced significant deterioration due to decades of chloride exposure from deicing salts. Widespread deck delamination, spalling, and cracking had resulted in a poor riding surface and raised long-term durability concerns.

The rehabilitation included full and partial-depth removal of deteriorated concrete, deck scarification, placement of a bonded concrete overlay, installation of a waterproofing membrane and new asphalt surface. The deck was also widened slightly to improve roadside clearances. Additional work included localized concrete repairs to the curbs, barriers, and substructure, replacement of expansion joint seals, and approach roadway improvements.

The project restored structural performance, improved safety and ride quality, and extended the service life of the bridge while aligning with current County standards.