sentences:  At that point the more urban surroundings of Lafayette are evident, and the next two miles (3 km) run through the heart of Lafayette, including the road junction with US 287 (N. 107th St.).About one mile (1.6 km) beyond the eastern city limits of Lafayette, the road crosses the eastern boundary of Boulder County and passes the Erie Municipal Airport.For two miles (3 km) beyond this point, Baseline Road forms the boundary between Weld County and the City and County of Broomfield.