A brand new 4 direction interchange was constructed on HWY 99 at 16th Avenue. The project required the relocation of Ferguson and Carlson Creeks. Two pre-cast panel walls were required for north and southbound off ramps, the later requiring a curved wall. Property acquisitions were untimely so a temporary stream channel had to be constructed to bypass an entire portion of the project site for several months. The project was completed 2 months ahead of schedule.