Deep River is a city in Poweshiek County, Iowa, United States.

[3] According to the United States Census Bureau, the city has a total area of 0.43 square miles (1.11 km2), all land.

When the Chicago and North Western Railway was built, the residents of Dresden moved to be near the railroad, and thus the town of Deep River was established in 1884.

The town of Tilton was established at the southern border of the township in 1884 as well, although this largely lay in Keokuk County.

The first settlers to live in Deep River Township were Robert Taylor and family from Ohio; John Sargood, whose father was from England; Albert Morgan and family from Ohio; and the Lights, who came from Virginia in 1849.

The first township election was held in 1857 with the following officers: Ephraim Cox, Asa Cohoe and John Morgan, trustees; Myron Whitney, clerk; L. Mayo, C. M. Wolcott, justices of the peace; H. Armstrong and C. Barber, constables; and James Hillman, road supervisor.

The town of Deep River was incorporated in the summer of 1887 after the Northwestern Railroad spur from Belle Plaine to Muchakinock in southern Iowa was built.

Horace Phelps built a depot and gave the railroad $1,500 to secure the location there.

The first town election resulted in the following officers: J. S. Potter, Mayor; S. S. Jenkins, recorder; J. C. Sanders, treasurer; C. F. Cutler, assessor; James Sargood, marshal; A. C. Converse, Charles Lacher, N. M. Valentine, J. P. Sargood, E. T. Whitney and James Light, councilmen.

On May 14, 1970, the local area was subjected to a significant flood on the Deep River which was assessed as having a greater than 50 year recurrence interval.

[6] The stream gauge on the Deep River station measured a record stage of 83.85 feet (25.56 m) and with a stream flow of 6,200 cubic feet per second (180 m3/s)[7] As of the census of 2020,[9] there were 249 people, 103 households, and 73 families residing in the city.

30.3% of all households were made up of individuals, and 18.5% had someone living alone who was 65 years of age or older.

28.3% of all households were made up of individuals, and 17.5% had someone living alone who was 65 years of age or older.

About 4.9% of families and 5.6% of the population were below the poverty line, including 5.6% of those under the age of eighteen and 10.0% of those 65 or over.