Bridge conditions in Allen County, Indiana 615 inventoried bridges · 45 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions 2025 National Bridge Inventory, FHWA Compiled 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.
Every bridge in Allen County →
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Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected .