Historically, Washington Street formed part of the heart of New Castle’s commercial and civic life, with early mercantile houses, hotels, and public buildings dating back to the early 19th century. It became a main artery for business and social activity as New Castle developed from a frontier settlement into an important industrial and transportation hub. The street’s proximity to the confluence of the Shenango River and Neshannock Creek helped solidify its importance to trade and travel in the region.