Location: Interlochen Loop and Federal Blvd, Broomfield Just after the US-36 junction, we’ll approach US-287. Location: Interlochen Loop and Federal Blvd, Broomfield Stay straight for US-287 north. Turn left for US-287 south. SH-121 ends.  S to CO-128  S to CO-128, N to NW Pkwy  W to CO-170, E to CO-95