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Bridge crossing the Mississippi river in Minnesota, United States

The Stone Arch Bridge is a former railroad bridge crossing the Mississippi River at Saint Anthony Falls in downtown Minneapolis, Minnesota. It is the only arched bridge made of stone on the entire Mississippi River. It is the second oldest bridge on the river next to Eads Bridge. 117 Portland Avenue is the general address of the historic complex. Located between the 3rd Avenue Bridge and the I 35W Saint Anthony Falls Bridge, the Stone Arch Bridge was built in 1883 by railroad tycoon James J. Hill for his Great Northern Railway, and accessed the former passenger station located about a mile to the west, on the west bank of the river. For a time, the bridge was dubbed "Hill's Folly" until the value of Hill's new bridge as a passenger rail link became evident. The structure is now used as a pedestrian and bicycle bridge. It was added to the National Register of Historic Places in 1971 as a part of the Saint Anthony Falls Historic District, (District #71000438). The bridge was designated as a National Historic Civil Engineering Landmark in 1974.

In 1880, Minneapolis was a bustling city with major commerce mostly located on the west bank of the Mississippi River, while smaller, up and coming businesses were on the east. With the merging of the Village of St. Anthony on the east side, Minneapolis continuously grew in population, and the Hennepin Avenue suspension bridge served as the sole thoroughfare for commuters and pedestrians. At that time, the Hennepin Avenue bridge was overused and in desperate need of upkeep. The city's network of railroads, which was crucial for urbanization, was also located on the east side of the river. With the rapid increase in commercialization, Minneapolis businessmen sought a plan to accommodate the heavy flow of traffic, and immediately considered the railroad mogul James J. Hill for the task. The idea was to build a railroad depot, similar to the St. Paul Union Depot, along the intersections of Hennepin Avenue and Nicollet Avenue in downtown Minneapolis, which would also connect to the Manitoba Road tracks, eventually developing into the Great Northern Railway. The initial planning was conducted during a meeting held near the end of 1881. The project would include building a terminal in downtown Minneapolis and connecting the rails to the Manitoba Railway, the execution for which was accomplished by the Minneapolis Union Railway company, a team that was built for the sole purpose of overseeing the project. The stockholders met for the first time immediately the following year and Col. Charles C. Smith was selected as the head engineer. The bridge has been altered somewhat from its original appearance. When the Upper Lock and Dam were built at Saint Anthony Falls, two of the arches were replaced with a moveable truss so barges could pass through the lock. Later, in 1965, flood waters undermined three of the piers and caused the bridge to sag fourteen inches. Fireworks displays on the Fourth of July and during the Minneapolis Aquatennial in late July also bring crowds; fireworks are launched from nearby Hennepin Island. The bridge offers views of the Minneapolis skyline, Pillsbury "A" Mill, the Mill City Museum, and many other places in the district, and is near both the restaurants of Main St SE and the Guthrie Theater.

A plaque near the bridge explains that the bridge was built for the Manitoba Line (St. Paul, Minneapolis and Manitoba Railway), which would be used to bring wheat from the Red River valley and Canada to the Minneapolis mills. It remains as a monument to James J. Hill, his vision, and is a National Historic Civil Engineering Landmark.