 The trestle had, however, become a significant fire hazard since the [pentachlorophenol-isobutane-ether treated] wood had dried considerably in the desert conditions and the automatic fire sprinkler system had been deactivated in 1991.Efforts were underway to secure the funding necessary to have the structure protected as a national historic landmark, although efforts are complicated by the top secret nature of the Sandia/Kirtland facility it is situated on.The trestle structure is still easily visible from commercial aircraft landing and taking off from Albuquerque International Sunport, lying about one mile to the southeast of the threshold of Runway 26.