Question: What river has five waterfalls depicted on a state seal?

Documents:
source: Seal of Montana
text: Seal of Montana The Great Seal of the State of Montana was adopted in 1865, when Montana was a United States Territory. When it became a state in 1889, it was decided to use the same seal. In 1891, proposals were made to make changes or adopt a brand new seal. None of these proposals passed legislation. The outer ring of the seal contains the text "The Great Seal of the State of Montana". The inner circle depicts a landscape of mountains, plains and forests by the Great Falls on the Missouri River. A plow, a pick and a shovel are depicted on the front, representing the state's industry. The banner at the bottom of the seal reads the territorial motto of "Oro y Plata", meaning "Gold and Silver" in Spanish.

source: Great Falls (Missouri River)
text: Great Falls (Missouri River) The Great Falls of the Missouri River are a series of waterfalls on the upper Missouri River in north-central Montana in the United States. From upstream to downstream, the five falls, which are located along a 10 mi segment of the river, are:

source: Flag of Nebraska
text: Flag of Nebraska The flag of the state of Nebraska is a blue rectangular cloth charged with the Nebraskan state seal. The current design was commissioned in 1925, when a bill was passed that the flag would have the Nebraska state seal in gold and silver on a field of national blue.

source: Flag of Minnesota
text: Flag of Minnesota The flag of Minnesota is the state flag of Minnesota and consists of scenes from the Seal of Minnesota on a blue background. The first version of the flag was flown from 1893 until 1957, and was changed to be more easily manufacturable, and the state seal became simpler. The current flag was adopted in 1957 and the state seal on the flag was modified in 1983.

source: Aintharuvi
text: Aintharuvi Aintharuvi is a group of five waterfalls, that is nearby the famous waterfalls of Tamil Nadu, India, the Coutrallam Falls. It is located in Tenkasi. The English meaning of the name is Five falls.The waterfalls is compared with Adisesha, the holy snake since the waterfalls cascades in five directions resembling a 5-headed Cobra.

source: Seal of Colorado
text: Seal of Colorado The Seal of the State of Colorado is an adaptation of the territorial seal which was adopted by the First Territorial Assembly on November 6, 1861. The only changes made to the territorial seal design being the substitution of the words, "State of Colorado" and the figures "1876" for the corresponding inscriptions on the territorial seal. The first General Assembly of the State of Colorado approved the adoption of the state seal on March 15, 1877. The Colorado Secretary of State alone is authorized to affix the Great Seal of Colorado to any document whatsoever.

source: Flag of Florida
text: Flag of Florida The flag of Florida consists of a red saltire on a white background, with the state seal superimposed on the center. The design was approved by popular referendum November 6, 1900. The flag's current design has been in use since May 21, 1985, after the state seal was graphically altered and officially sanctioned for use by state officials.

source: Seal of Oregon
text: Seal of Oregon The Seal of the State of Oregon is the official seal of the U.S. state of Oregon. It was designed by Harvey Gordon in 1857, two years before Oregon was admitted to the Union. The seal was preceded by the Salmon Seal of the Provisional Government and the Seal of the Oregon Territory. The state seal is mandated by Article VI of the Oregon Constitution.

source: Emma Edwards Green
text: Emma Edwards Green Emma Edwards Green, born Emma Sarah Etine Edwards (1856-1942), known also as Mrs. Emma Green, was an American painter and designer. She designed the State Seal of Idaho, used also on the Flag of Idaho, and is the only woman to have designed a state seal.

source: Seal of Uttarakhand
text: Seal of Uttarakhand The State Seal of Uttarakhand or The State Emblem of Uttarakhand is the official state seal used by the Government of Uttarakhand and is carried on all official correspondences made by State of Uttarakhand. It was adopted by the newly formed Interim Government of Uttarakhand at the establishment of the state on 9 November 2000.

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Answer: Missouri River