Rocky Mountain Metro Airport (BJC) has seen a notable surge in TCAS resolution alerts and close proximity incidents. A contributing factor to this increase has been a lack of route structure for aircraft entering, exiting, and transitioning the airspace. 

Due to mountainous terrain and the Denver Class B airspace, aircraft around BJC are funneled through a north-south orientation to transit the Denver Metro Area. BJC has 4 flight schools based at the airport and there are additional flight schools based at surrounding airports. Additionally, BJC handles hundreds of IFR & VFR operations per day. This increasingly complex airspace has created the need to develop uncharted VFR transition routes. 

Uncharted VFR Arrival and Departure routes have been developed using visual landmarks and VFR waypoints integrated into the GPS database. These routes aim to reduce frequency congestion and simplify instructions for VFR flights landing, departing, and transitioning BJC. 

Application of these uncharted arrival, departure, and transition procedures, or any action taken by ATC to avoid traffic conflicts, does not relieve pilots of the responsibility to see and avoid other traffic while operating under Visual Flight Rules (14CFR 91.113).

To assist ATC with enhancing the safety of operations near BJC, pilots should:  

• Familiarize themselves with the airspace.
• Familiarize themselves with the airport layout and information prior to flight.
• Actively listen to ATC instructions and clearances to ensure instructions are understood.
• Read back instructions and clearances.
• Request transition route with GC on Departure or on initial call with ATC when inbound.
• Ask ATC if there is any doubt about the VFR route assigned.