
The bridge was started in the early winter of 1871. The bridge was completed in June of 1872 and the first engine, bedecked in flowers, entered Fargo.
The image to the upper right is a photograph by O.E. Flaten, a Moorhead photographer who worked from 1879 to to 1929. It appears that this was taken at some sort of ceremony at the bridge. Note that the footbridge seen on the lower image has not yet been built. Note also the steamboat. I believe that the picture is facing north from the Moorhead side of the river.
The image to the lower right is one-half of a stereoview photograph (enlarged and cropped). The picture shows the first bridge across the Red River at Fargo/Moorhead. The bridge built was replaced in 1883, 1897, and in 1927.
Note the footbridge across the river just below the railroad bridge. I believe that we are looking north and ,hence, the houses in the background are in Moorhead.
In February of 1872, the Northern Pacific Railroad filed a railroad plat of its road through Dakota Territory. The original townsite of Fargo was platted out of Section Seven and filed for record in the Cass County Deeds Office in January 1874. Island Park was a part of Section Seven and was deeded to the city for a park.
The Northern Pacific Railroad continued westward, reaching Bismarck in 1873. The NP railroad went bankrupt that year in Wall Street's Panic of 1873. Aggressive westward building restarted in 1879 under new ownership.
For more about the NP Bridge, please continue here.