 Illinois was 374 feet ( 114 m ) long overall and had a beam of 72 ft 3 in ( 22 @.@ 02 m ) and a draft of 23 ft 6 in ( 7 @.@ 16 m ) . She displaced 11 @,@ 565 long tons ( 11 @,@ <unk> t ) as designed and up to 12 @,@ 250 long tons ( 12 @,@ 450 t ) at full load . The ship was powered by two @-@ shaft triple @-@ expansion steam engines rated at 16 @,@ 000 indicated horsepower ( 12 @,@ 000 kW ) and eight coal @-@ fired fire @-@ tube boilers , generating a top speed of 16 knots ( 30 km / h ; 18 mph ) . As built , she was fitted with heavy military masts , but these were replaced by cage masts in 1909 . She had a crew of <unk> officers and enlisted men , which increased to 690 – 713 . 
