"New Hampshire" was long overall and had a beam of and a draft of . She displaced as designed and up to at full load. The ship was powered by two-shaft triple-expansion steam engines rated at , with steam provided by twelve coal-fired Babcock & Wilcox boilers ducted into three funnels. The propulsion system generated a top speed of . As built, she was fitted with heavy military masts, but these were quickly replaced by lattice masts in 1909. She had a crew of 827 officers and men, though this increased to 881 and later to 896.