Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 22.83; Flight Crew Total 1685.68; Flight Crew Type 22.83
Other / Unknown; Distraction
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Other / Unknown
Flight Crew Overcame Equipment Problem; Flight Crew Returned To Clearance
Chart Or Publication
We were in visual conditions on approach to GEG; when we were cleared by GEG Approach control to descend to an altitude of 3;900 feet; while also being cleared for the visual approach Runway 21. As we began to descend; I as the pilot monitoring; looked outside and noticed some tall radio towers.  I brought the towers to the Captain's attention and he immediately stopped the descent in order to prevent us from coming any closer to the towers. If I remember correctly we stopped the descent at approximately 5;300 feet. We then flew over the towers and after clearing them we continued our descent to 3;900 ft and commenced the visual approach to a successful and safe landing. We were never given any warning about the towers and did not notice the towers on the approach plate until after landing and getting to the hotel. Since this was my first time flying into GEG; and the Captain had not flown to GEG in years; we were both unfamiliar with the area and after this incident would recommend that a better warning be given on the 10-7 pages as well as on the approach plates.These warnings would not only help those who are unfamiliar with the area and specifically the radio towers; but would help remind those that are familiar with the area to possible encounters with the towers.
After being cleared for a visual approach to Runway 21 in GEG; I started a descent to the SIGYOFAF altitude using FLCH with the autopilot on.  During the descent the FO verbalized that he saw towers at approximately our 12:00 o'clock position.  I promptly leveled off until we passed the towers and then continued the visual approach backed up with the ILS for an uneventful landing. It should be noted that there are towers on a bluff a few miles SE of the Runway 21 FAF that are higher than the FAF altitude.
Air Carrier flight crew reported a hazardous situation exist with tall radio towers in the vicinity of GEG airport. Reporters recommends more prominent warnings on approach and airport charts to flight crews .