Each edition grades its towns against each other only.
Most of Riverdale Township was built recently: 0.0% of its homes predate 1940 and the median home dates from 1989. Below: 6 old photos and papers, maps from 1894 on, and the census since 1990.
Read from the archive, the National Register and the record. The page puts what stands out first.
The first neighbors to add old photos shape how Riverdale Township’s history is told.
Wikipedia doesn’t have a history of Riverdale Township yet. The photos, dates and memories neighbors add here are how it gets written.
Between the 2010 and 2020 censuses its population fell from 95 to 93 (-2%).
Date?Garrison Dam, Switchyard, 597 Garrison Dam Road
Date?Garrison Dam, Powerhouse, 597 Garrison Dam Road
Date?Garrison Dam, Project Administration Building, 201 1s…
Date?Garrison Dam, Intake House, 597 Garrison Dam Road
Date?Garrison Dam, Spillway, State Route 200 at Missouri R…
Date?Garrison Dam, Penstocks and Surge Tanks, 597 Garrison…Every edition of the U.S. Geological Survey’s map of Riverdale Township. Tap a year, or press play to watch the town change.
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Riverdale Township.
No then-and-now pairs yet. Take a photo from the same spot as an old one and they appear here side by side.
Find the spot, match the angle, and add your photo. It becomes the first then-and-now pair on Riverdale Township’s page.
Retake this view · +15Between 205 and 283 people in every census since 1990.
4 censuses, 1990–2020.
U.S. Census Bureau decennial counts, from the census table on Riverdale Township’s Wikipedia page.
Places and cemeteries from the USGS Geographic Names Information System (2021).
Each neighbor’s History grade, on the same three inputs.
What the archives can’t tell you, neighbors can.
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 Library of Congress (6), U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia) 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.
