American Society of Civil Engineers Los Angeles Section Section Orange County Branch Historic Civil Engineering Landmarks (L) = Local HCEL        (R) = Region 9 HCEL        (N) = National HCEL Orange County Branch Landmarks Map Orange County Branch Website Los Angeles Section Landmarks Map Los Angeles Section Landmarks List Region 9 National Historic Civil Engineering Landmarks List Los Angeles Section Website 33.8377780,lon:-118.3116670 No. Landmark Name Location Latitude Longitude 53 Santa Ana Valley Irrigation System  (L) Orange County 33.8694 -117.7136 54 City of Anaheim Water System (L) Orange County 33.8344 -117.9139 55 Mission Buildings of San Juan Capistrano (L) Orange County 33.510 -117.667 56 Tustin MCAS Blimp Hangars (N) (See also Paul Freeman's Website) Orange County 33.7131 -117.8228 59 and 60 Orange County Sanitation District (L) Orange County 33.6936 -117.9392 61 Santa Ana Army Airbase (L) Orange County 34.8987 -117.0641 62 Newport Harbor (R) Orange County 33.5956 -117.9036 63 Orange County Flood Control District (R) Orange County 33.7481 -117.8775 64 Orange County Water District (R) Orange County 33.6936 -117.9444 65 Anaheim Union Water Company (L) Orange County 33.9033 -117.8658 66 John Wayne Airport (L) Orange County 33.680 -117.861 67 Irvine Ranch Irrigation System (L) Orange County 33.7838 -117.7624 68 Torrence Pacific Electric Railroad Bridge (L) Orange County 33.8378 -118.3117