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Bridge conditions in Allen County, Indiana

615 inventoried bridges · 45 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

The federal inventory lists 615 bridges in Allen County: 257 rated good, 313 fair, and 45 poor.

45 of the 615 bridges in Allen County, Indiana, are rated in poor condition (7.3%) in the 2025 National Bridge Inventory, as of August 20, 2026.
257 bridges (41.8%) are rated good and 313 (50.9%) fair.
The median Allen County bridge was built in 1980.
The busiest poor-rated bridge is Bluffton Rd over St Marys River (built 1986), carrying about 23,300 vehicles a day.

Good 41.8% · Fair 50.9% · Poor 7.3% of 615 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Bridge	Built	Vehicles/day	Condition
Bluffton Rd over St Marys River	1986	23,300	Poor
Clinton St over Beckett Run	1948	20,000	Poor
Tillman Rd over Highland Drain 4	1966	12,125	Poor
Ewing St NB over St Marys River	1981	10,100	Poor
Columbia St over Delta Lake	1939	10,025	Poor
Paulding Rd over Trier Drain	1966	9,025	Poor
Lahmeyer Rd over Bullerman Drain	1970	8,050	Poor
Elizabeth St over Spy Run Creek	1993	7,525	Poor
Ferguson Rd over St Marys River	1972	5,750	Poor
Woodburn Rd over Grover Drain #2	1972	4,225	Poor
Fourth St over Spy Run Creek	1921	3,025	Poor
Ellison Rd over Graham Mcculloch Drain	1945	2,550	Poor
Meyer Rd over Trier Drain	1969	2,525	Poor
Bull Rapids Rd over Marsh Drain	1979	1,800	Poor
Muldoon Rd over Snyder Drain	1976	1,692	Poor
Summit St over A. Martin Drain	1970	1,683	Poor
Homestead Rd over Little River	1977	1,581	Poor
Cuba Rd over Oberhaltzer Ditch	1937	1,150	Poor
Monroeville Rd over Flatrock Creek	1975	1,148	Poor
Monroeville Rd over Hoffman Drain	1960	1,071	Poor
Main St over Trier Drain	1970	974	Poor
Goeglein Rd over Bullerman Drain	1969	769	Poor
Liberty Mills Rd over Aboite Creek	1968	536	Poor
Tamarack Dr over Shoppman Drain	1971	462	Poor
Reed Rd over Pierson Drain #2	1976	308	Poor
Winters Rd over Harber Drain	1976	224	Poor
Van Zile Rd over St Joseph River	1883	200	Poor
Rupert Rd over Wertz Ditch	1970	200	Poor
Milan Center Rd over Botteron Drain	1973	179	Poor
Slusher Rd over Edgerton-carson Drain	1935	175	Poor
Hamilton Rd over Rebecca Knight Drain	1883	175	Poor
Branstrator Rd over Robinson-brindle Drain	1900	156	Poor
E Lincoln Hwy over Flatrock Creek Overflow	1935	156	Poor
Antwerp Rd over Oberhaltzer Ditch	1970	150	Poor
Kell Rd over Willow Creek	1974	150	Poor
Smith Rd over Robinson-brindle Drain	1974	128	Poor
Fisher Rd over James T. Johnson Drain	1970	125	Poor
Barkley Rd over Brown Drain	1975	112	Poor
Ray Rd over Eel River	1973	108	Poor
Grisamer Rd over James T Johnson Drain	1971	108	Poor
Amber Rd over Little River	1935	102	Poor
Iron Bridge Rd over Natural Drain	1976	102	Poor
Iron Bridge Rd over Natural Drain	1976	102	Poor
Parent Rd over Six Mile Creek	1978	26	Poor
Wyburn Rd over Bohnke Drain	1890	2	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I-69 over Durnell Ditch	1961	59,380	Fair
I-469 over Martin Ditch	1995	44,507	Good
I-469 over Swift Ditch	1995	44,507	Fair
W Jefferson Blvd over Moorman Drain	1948	38,000	Fair
W Jefferson Blvd over Natural Drain	1930	38,000	Fair
I-69 over Graham Mccullough Dit #4	1964	36,360	Good
I-69 NB over Spy Run Creek	1960	36,327	Good
I-469 over Dawkins Road	1991	36,230	Fair
SR 14 over I-69 Nb/sb	1960	35,873	Good
I-69 SB over Spy Run Creek	1960	35,732	Fair

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

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Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.