Bridge conditions in Benton County, Iowa 373 inventoried bridges · 81 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions 2025 National Bridge Inventory, FHWA Compiled August 20, 2026
About one in 5 bridges in Benton County is rated in poor condition: 81 of 373 on the federal inventory, one of the higher shares in Iowa.
81 of the 373 bridges in Benton County, Iowa, are rated in poor condition (21.7%) in the 2025 National Bridge Inventory, as of August 20, 2026 .134 bridges (35.9%) are rated good and 158 (42.4%) fair.
The median Benton County bridge was built in 1987 .
The busiest poor-rated bridge is 4TH St over Hinkle Creek (built 1973), carrying about 3,197 vehicles a day.
Good 35.9% · Fair 42.4% · Poor 21.7% of 373 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 4TH St over Hinkle Creek 1973 3,197 Poor FM over Bear Creek 1969 2,740 Poor 30 Ave over Small Natural Stream 1958 1,561 Poor FM over Dry Creek 1961 1,444 Poor FM over Bear Creek 1957 1,414 Poor FM over Cedar River 1969 1,267 Poor FM over Prairie Creek 1965 1,090 Poor FM over Opossum Creek 1959 1,090 Poor FM over Opossum Creek 1959 1,090 Poor 13 Ave over Buckeye Creek 1976 1,002 Poor FM over Small Stream 1925 940 Poor FM over Prairie Creek 1969 835 Poor FM over Prairie Creek 1960 820 Poor FM over Prairie Creek 1961 766 Poor FM over Hinkle Creek 1962 570 Poor FM over Prairie Creek 1967 550 Poor FM over Pratt Creek 1989 540 Poor FM over Pratt Creek 1956 540 Poor FM over Hinkle Creek 1988 530 Poor FM over Spring Creek 1959 430 Poor FM over Rock Creek 1985 430 Poor FM over Br Little Bear Creek 1929 422 Poor 10TH Ave over Minnow Creek 1900 349 Poor FM (lwc) over Small Stream 1990 330 Poor FM over Cedar River 1968 324 Poor FM over Mud Creek 1955 200 Poor FM over Br Cedar River 1975 150 Poor FM over Buckeye Creek 1973 100 Poor Local over Morgan Creek 1964 90 Poor Local over Prairie Ck 1971 90 Poor FM over Br Rock Ck 1973 90 Poor FM over Prairie Creek 1900 80 Poor Local (lwc) over Br Prairie Ck 1978 60 Poor E. 13TH St over Mud Ck 1965 60 Poor Local over Stein Ck 1971 60 Poor Local over Stream 1959 50 Poor Local over Dry Ck 1973 50 Poor Local over Prairie Creek 1970 50 Poor Local over Prairie Creek 1947 50 Poor Local (lwc) over Weasel Creek 1979 45 Poor FM over Prairie Creek 1959 45 Poor Local over Br Buckeye Ck 1976 45 Poor Local over Bear Ck 1941 40 Poor Local over Dry Creek 1976 39 Poor Local over Wild Cat Creek 1900 39 Poor Local (lwc) over Stream 1977 35 Poor Local over Oppossum Creek 1960 34 Poor Local over Br Opossum Ck 1970 34 Poor Local over Mud Creek 1945 34 Poor Local over Br Stein Ck 1969 34 Poor Local over Stream 1977 30 Poor FM over Branch Mud Creek 1983 30 Poor FM over Rock Ck 1958 30 Poor FM over Wolf Creek 1953 30 Poor Local over Br Prairie Ck 1976 29 Poor Local over Br Prairie Ck 1900 29 Poor Local over Weasel Ck 1957 28 Poor Local over Mud Creek 1976 26 Poor Local over Mud Creek 1983 26 Poor Local over Rock Creek 1982 26 Poor Local over Spring Ck 1971 26 Poor Local Rd over Br Mud Ck 1900 20 Poor Local over Br Prairie Ck 1970 20 Poor Local over Stream 1970 20 Poor Local over Br Opossum Ck 1958 20 Poor Local over Bear Ck 1972 20 Poor FM (lwc) over Small Stream 1980 20 Poor Local (lwc) over Prairie Creek 1980 15 Poor Local over Prairie Creek 1974 15 Poor Local over Br Wildcat Ck 1957 15 Poor FM over Mud Creek 1951 15 Poor Local over Stein Ck 1948 15 Poor FM over Pratt Creek 1971 15 Poor Local over Prairie Ck 1947 15 Poor Local over Opossum Ck 1959 11 Poor Local over Small Creek 1976 11 Poor Local over Stein Ck 1999 11 Poor Local over Rock Ck 1974 11 Poor Local over Spring Ck 1971 11 Poor Local over Br Stein Ck 1971 5 Poor Local (lwc) over Branch Rock Creek 1984 5 Poor
Busiest bridges in the county Bridge Built Vehicles/day Condition I 380 over Drainage Ditch 1982 21,300 Good I-380 over Prairie Creek 1983 17,900 Good US 30 & 218 over Stream 1991 15,400 Fair I 380 NB over Ia 150 1982 8,550 Good I 380 SB over Ia 150 1982 8,550 Good US 151 over Knapp Creek 1995 7,800 Good US 218 over Hinkle Creek 1959 4,910 Good US 30 & US 218 over Mud Creek 2000 4,750 Fair US 30 EB over Mud Creek 1998 4,750 Fair US 30 EB over Prairie Creek 2022 3,850 Good
Source: FHWA National Bridge Inventory , 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
Every bridge in Benton County →
All of Iowa: Iowa bridge conditions by county · every download on the data page .
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected .