Eagle’s post office opened in 1908, and 8 of its places are on the National Register
More historic than 23% of U.S. towns · #47 of 59 in Idaho. What drives it
Most of Eagle was built recently: 3% of its homes predate 1940 and the median home dates from 2007. 8 places in town are on the National Register, among them a historic district with 7 buildings. Below: maps from 1914 on and the census since 1980.
Founding year: the first Eagle post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives Eagle’s History grade
On its age, its old homes and the National Register, Eagle is more historic than 23% of U.S. towns, #47 of 59 in Idaho. Its National Register listings hold the grade up; its age pulls it down.
C−
HistoryA character grade: shown, never part of Eagle’s overall grade.
Idaho towns list more on the Register than most of the country (a typical Idaho town has 8.4 per 10,000 residents, the U.S. 2.4), so Eagle’s 6.7 sits near the middle of its state (52% of Idaho towns have fewer) while its 22 historic buildings outnumber those of 80% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from D to C+. The pre-1940 share (±2.4 points) is firm at this size. The founding year is the first post office, not a stated founding date.
Founding year: the first post office (other dates in Quick answers). Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
What stands out about Eagle’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Eagle Island in Idaho was settled in 1863 by Truman Coe Catlin, who later shifted from crop farming to dairy farming, starting the island's dairy tradition. He also pioneered irrigation in the area by constructing a wide irrigation ditch. The most notable early community developer was Thomas Hugh Aiken, a Canadian surveyor, who helped establish the Eagle community in the 1870s. Despite the construction of Arrowrock Dam in 1915 and subsequent dams, flooding has been a recurrent issue for residents, leading to continued efforts to mitigate flood risks.
The Eagle post office opened in 1908, the earliest record of the town by name (U.S. post office records).
How does Eagle rank for history?
Eagle is more historic than 23% of U.S. towns, #47 of 59 in Idaho. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
What is on the National Register in Eagle?
8 listings: 7 buildings, among them the O. F. Short House (listed 1980, the first), and 1 historic district, the Firebird Raceway, with 7 contributing buildings. 22 historic buildings in all.
How old are the homes in Eagle?
3% of Eagle’s homes were built before 1940 (Census estimate, ±2.4 points), against a typical 8.5% for an Idaho town; the median home was built in 2007.
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).
From Wikimedia Commons (9), Wikidata (3), the National Register of Historic Places (8), Wikipedia, Wikidata and Wikipedia for famous people, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock), the USGS Geographic Names Information System and Sanborn fire insurance maps (Library of Congress). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.