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History · Riverside Township

Riverside Township’s post office opened in 1870, and 39% of its homes were built before 1940

Its Register listings are the South Dakota Department of Transportation Bridge No. 14-090-042 and the South Dakota Department of Transportation Bridge No. 14-060-032.

1870first post office
2on the National Register
39%homes built before 1940
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Quick answers

How Riverside Township began

When was Riverside Township founded?

1870

The Riverside Township post office opened in 1870, the earliest record of the town by name. Another post office, Riverside (1870), opened inside today’s town and later closed.

2020 census: 148156 years
Founding year: the first Riverside Township post office (Blevins & Helbock, CC0).
On the National Register

2 historic places in Riverside Township

The country’s official list of buildings and places worth saving.

places listed
2
National Historic Landmarks
0
none yet
historic buildings protected
2
each building in a district counts
first listed
2000
South Dakota Department of Transportation Bridg…
South Dakota Department of Transportation Bridge No. 14-090-042South Dakota Department of Transportation Bridge No. 14-060-032
Structures

Architectural styles listings

Warren pony truss with polygonal Upper chords1
Concrete deck arch1
All 2 listings
South Dakota Department of Transportation Bridge No. 14-090-042Structure · listed 2000South Dakota Department of Transportation Bridge No. 14-060-032Structure · listed 2000

National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.

Places that used to be

Lost post offices, old corners, places now gone and burying grounds

Another post office, Riverside, opened and closed inside today’s town.

Hamlets and corners on the map
Colfax CornerRiverside
Gone or out of use
Bixler Ridge AirportairportFrog Creek SchoolschoolNorth Riverside Schoolschool
1cemetery inside Riverside Township
Riverside - Barton

US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).

Stories next door

History across the town line

Each neighbor’s History grade, on the same three inputs.

Pleasant Valley Township1 historic placenot graded: under 1,000 residents or part of its townGlenwood TownshipIts storynot graded: under 1,000 residents or part of its townCenterville Township2 historic placesnot graded: under 1,000 residents or part of its townStar Township1 historic placenot graded: under 1,000 residents or part of its town

Questions about Riverside Township’s history

What year was Riverside Township founded?

The Riverside Township post office opened in 1870, the earliest record of the town by name (U.S. post office records).

What is on the National Register in Riverside Township?

Two places: the South Dakota Department of Transportation Bridge No. 14-090-042 (listed 2000) and the South Dakota Department of Transportation Bridge No. 14-060-032 (2000).

Memory lane

What the archives can’t tell you, neighbors can.

Town Square →
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Sources

Where this page comes from

Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021). How TownRatings grades history →

From the National Register of Historic Places (2), the US Post Offices dataset (Blevins & Helbock) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.