ARMY TM 5-5420-212-10-1 MARINE CORPS TM 08676A-10/1-1 TABLE 1-3.  Double Story Bridge Length v Gap Width BRIDGE LENGTH 2E + No.  OF BAYS MINIMUM GAP WIDTH MAXIMUM GAP WIDTH FEET METERS ** FEET METERS FEET METERS 36 11.0 1 21 6.4 29.5 9.0 42 12.8 2 27 8.2 35.5 10.8 48 14.6 3 33 10.0 41.5 12.6 54 16.5 4 36 11.9 47.5 14.5 60 18.3 5 45 13.7 53.5 16.3 66 20.1 6 51 15.5 59.5 18.1 72 21.9 7 57 17.3* 65.5 19.9* 78 23.8 8 63 19.2 71.5 21.8 84 25.6 9 69 21.0 77.5 23.6 90 27.4 10 75 22.8* 83.5 25.4* 96 29.3 11 81 24.7 89.5 27.3 102 31.1 12 87 26.5 95.5 29.1 108 32.9 13 93 28.3 101 30.9 114 34.8 14 99 30.2 108 32.8 120 36.6 15 105 32.0 112 34.6 126 38.4 16 111 33.8 119 36.4 132 40.2 17 117 35.6 125 38.2 138 42.1 18 123 37.5 131.5 40.1 144 43.9 19 129 39.3 137.5 41.9 150 45.7 20 135 41.1 143 43.7 156 47.6 21 141 43.0 148 45.6 162 49.4 22 147 44.8 151.5 47.4 NOTE: *  Due to rounding figures to one decimal point, these figures are different to those found in Chapter 3. **  Double story and link reinforced bridges are described "2E + No.  of Bays" (2 ends of bridge + No.  of Bays) 1-12