HistoricSiteMarkers
Civil War

Eldean Covered Bridge

Miami County, Miami County, Ohio

Marker Inscription

Originally known as Allen’s Mill Bridge, the Eldean Covered Bridge was built over the Great Miami River in 1860 for Miami County by the Hamilton Brothers of nearby Piqua. Its 224 feet place it among Ohio’s longest covered bridges.

Erected by Ohio History Connection

The Story

Spanning the Great Miami River near Troy, the Eldean Covered Bridge dates to 1860, when the Hamilton Brothers of Piqua raised it for Miami County using the Long truss design patented decades earlier by Stephen H. Long. Originally called Allen's Mill Bridge for the gristmill it served, it carried farm wagons and local traffic across a river that could turn treacherous in flood. At 224 feet across two spans, it stands among the longest surviving covered bridges in Ohio and one of the finest examples of its truss type in the country.

Why it matters

Covered bridges like the Eldean protected their wooden trusses from rot and let rural nineteenth-century America knit farms to mills and markets across unbridged rivers; its survival makes it a rare working relic of the craftsmanship that carried the country's inland commerce before the age of steel and concrete.

Own a business near here? Add it to the map.

Related people

  • · Hamilton Brothers

Themes & tags

Nearby & related markers

Miami and Erie Canal – Footprint of Lock 12

Troy, OH

In the 1830s Ohio was racing to knit its interior farms to the wider world by water, and the Miami and Erie Canal was the state's grand answer—a hand-dug ribbon eventually linking Cincinnati on the Ohio River to Toledo on Lake Erie. The stretch reaching Troy was carved beginning around 1834, and by 1836 Lock 12 was raising and lowering canal boats through the town, its stone chamber letting vessels step up or down the valley's grade. The Troy section opened with real fanfare on July 4, 1837, when General William Henry Harrison—already a national figure and a future president—joined other dignitaries to mark the occasion. Today only the lock's footprint remains, a quiet trace of the waterway that once carried the region's grain, pork, and passengers.

Miami and Erie Canal Lock 15

Tipp City, OH

In the 1830s, canal fever swept Ohio as the young state raced to link its farms to the wider world. The Miami and Erie Canal, whose Lock 15 section here was dug between 1833 and 1837, was part of an ambitious waterway that eventually stretched some 250 miles from Cincinnati on the Ohio River to Toledo on Lake Erie. Locks like this one raised and lowered mule-drawn boats step by step across the region's changing elevation, and the towns that grew up along the towpath — Tipp City among them — owed their early prosperity to the barges gliding past.

Lockington Dam

Shelby County, OH

After the catastrophic Great Miami River flood of March 1913 drowned Dayton and killed hundreds, Ohio pioneered one of the nation's first comprehensive flood-control efforts: the Miami Conservancy District. Completed in 1921, Lockington Dam is one of five earthen 'dry dams' the District built across the valley's tributaries — structures that stand empty most of the year and only pool water behind them during dangerous high water, releasing it slowly downstream. Among the largest earthworks of its kind when it was finished, its great length and height reflect the ambitious scale of engineer Arthur E. Morgan's regional plan.

McCook Field

Dayton, OH

In the years around World War I, the U.S. Army turned a stretch of Dayton floodplain into one of the nation's first centers for aviation research, fittingly located in the hometown of the Wright brothers. Through the late 1910s and 1920s, engineers here pushed the young science of flight forward, testing new aircraft, engines, and equipment and chasing altitude and speed records at a time when airplanes were still a novelty. As the work outgrew the cramped, flood-prone site, it moved to a larger field nearby that would eventually become Wright-Patterson Air Force Base.