Bridge conditions in St. Louis County, Missouri 906 inventoried bridges · 45 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions 2025 National Bridge Inventory, FHWA Compiled August 20, 2026
45 of the 906 bridges the federal inventory lists in St. Louis County are rated poor; the rest split 272 good and 589 fair.
45 of the 906 bridges in St. Louis County, Missouri, are rated in poor condition (5.0%) in the 2025 National Bridge Inventory, as of August 20, 2026 .272 bridges (30.0%) are rated good and 589 (65.0%) fair.
The median St. Louis County bridge was built in 1990 .
The busiest poor-rated bridge is Is 270 E over Cst Conway Rd (built 1964), carrying about 182,944 vehicles a day.
Good 30.0% · Fair 65.0% · Poor 5.0% of 906 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 Is 270 E over Cst Conway Rd 1964 182,944 Poor Is 270 E over Cst West Port Plaza Dr 1965 137,112 Poor Is 270 E over Maline CR 1931 111,723 Poor Is 170 E over Rvr Des Peres 1968 97,246 Poor Is 64 W over Co North Forty Dr to Sor 1985 71,687 Poor Is 64 E over Co North Forty Dr to Sor 1985 64,631 Poor Is 44 W over Meramec Rvr South Outer 1968 37,539 Poor Is 44 W over Williams CR 1958 37,226 Poor Mo 21 S over Mattese CR 1967 25,160 Poor Rt D E over US 67 1961 24,533 Poor Mo 340 W over Cst Chesterfield Pkwy 1990 22,693 Poor Mo 21 S over Pedestrain Trail 1969 18,182 Poor Mo 366 E over Gravois CR 1931 17,101 Poor Rt Ac S over Br Maline CR 1968 15,413 Poor Reavis Barracks Rd over Gravois CR 1959 15,054 Poor Mo 141 N over Mo 370 1991 13,925 Poor N Elm Ave over Shady Grove CR 1989 13,730 Poor Rp IS64W to MO141S over Co North Forty Dr to Sor 1985 13,713 Poor SW Lucas-hunt Rd over NS RR 1973 12,342 Poor Missouri Bottom Rd over Is 270 1990 11,356 Poor Maryville Centre D over Is 64 1985 9,850 Poor Weidman Rd over Grand Glaize CR 1973 8,214 Poor Spoede Rd over Deer CR 1981 8,060 Poor US 50 E over Is 255 1969 7,946 Poor Rp IS64W to Long R over Is 64 1968 7,797 Poor Washington St over Br of Cold Water C 1963 7,794 Poor Timberlake Manor D over Is 64 1990 7,794 Poor Ferguson Ave over Maline CR 1977 5,973 Poor S Woods Mill Rd S over Is 64 Rp IS64E to MO141 1988 5,112 Poor Rp Missouri Bottom over Mo 370 N&W RR 1990 4,601 Poor Prichard Farm Rd over Fee Fee CR 2003 4,170 Poor Folk Rd over Black Creek Br 1987 3,000 Poor Dale Ave over Claytonia CR 1955 3,000 Poor Co SOR44E to Fento over Is 44 Or 44 1981 1,798 Poor Centaur Rd over Br of Wild Horse C 1967 1,136 Poor Wild Horse CR Rd over Br of Wild Horse C 1962 1,120 Poor Allenton Rd over UP RR 1928 1,000 Poor Trianon Ln over Br of Grand Glaize 1971 700 Poor Railroad St over Big Bend Blvd 1960 643 Poor Ladue Farm Rd over Creve Coeur CR 1978 550 Poor Weaver Ave over Black Creek Br 1984 500 Poor Mason Ln over Grand Glaize CR 1960 430 Poor Lewis Rd (oak Dr) over UP RR 1930 348 Poor Bellgrove Dr over Watkins CR 1999 300 Poor Elinor Ave over Hampton CR 1976 10 Poor
Busiest bridges in the county Bridge Built Vehicles/day Condition Is 270 E over Sugar CR 1962 212,715 Fair Is 270 E over Rp IS270E to IS64W Rp 1993 199,283 Fair Is 270 E over Cst Conway Rd 1964 182,944 Poor Is 270 E over Is 44 Rp IS270E to Is 1962 176,520 Fair Is 64 E over Hampton CR 1957 166,599 Fair Is 64 E over E Fk Deer CR 1957 166,599 Fair Is 64 E over Cst Laclede Station Rd 2008 166,599 Fair Is 64 E over Cst Claytonia Ter 2008 166,599 Fair Is 270 E over Mattese CR 1967 162,180 Fair Is 270 E over Crd Von Talge Rd BNSF R 1967 162,180 Fair
Source: FHWA National Bridge Inventory , 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Missouri: Missouri 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 .