The Bear Creek Interceptor design project consisted of designing parallel replacement improvements for over five miles of the 30- to 60-inch interceptor. The existing interceptor has been in service for more than 25 years, and portions of it have shown significant deterioration, and one section has failed. Following a full condition assessment that included review of records, Laser/Sonar/HD CCTV field inspection, APAI performed an economic analysis that demonstrated parallel replacement of the interceptor represented the best value to the Authority. The design of improvements addresses tie in of flow from 12 collection system segments within Grapevine, Euless, and DFW Airport, Texas. Fiberglass pipe and manhole risers were selected to ensure design life criteria for the project are met or exceeded. The design documents accommodate access restrictions along approximately two miles of the route within DFW Airport property and an additional mile that traverses a local golf course. The project included the design of multiple aerial crossings, a double barrel siphon and hundreds of feet of tunneling beneath TxDOT right-of-way.