Buchanan County, IA

281 public highway bridges

Buchanan County Bridge Snapshot

Buchanan County, Iowa contains 281 public highway bridges in the FHWA National Bridge Inventory. Roughly 40.2% are rated “Good,” 48.4% “Fair,” 5.7% “Poor,” and 5.7% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in IA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

281

Total Bridges

40.2%

Good

5.7%

Poor

5.7%

Structurally Deficient

Condition Distribution

Good

40.2% (113)

Fair

48.4% (136)

Poor

5.7% (16)

SD

5.7% (16)

All Bridges (281)

Sort:

330TH ST

Over: DRY CREEK

087073301, Buchanan, IA

Built 2007 Load: 19.8 t ADT: 62

DANIAL AVE

Over: SPRING CR

088102102, Buchanan, IA

Built 1956 Load: 19.8 t ADT: 11

LOCAL 240TH ST

Over: PINE CR

088081701, Buchanan, IA

Built 1961 Load: 20.0 t ADT: 16

LOCAL 265TH ST

Over: BEAR CR

088092703, Buchanan, IA

Built 1962 Load: 20.0 t ADT: 196

LOC 110TH ST

Over: HUNTER CR

090090701, Buchanan, IA

Built 1963 Load: 20.0 t ADT: 73

LOC CENTRAL AVE

Over: SMALL STREAM

090101604, Buchanan, IA

Built 1967 Load: 20.0 t ADT: 91

LOCAL 230TH ST

Over: PINE CR

088080901, Buchanan, IA

Built 2007 Load: 20.4 t ADT: 59

FM

Over: MALONE CREEK

089092406, Buchanan, IA

Built 2003 Load: 20.4 t ADT: 88

FM

Over: STREAM

090091003, Buchanan, IA

Built 1972 Load: 20.4 t ADT: 658

LOC 100TH ST

Over: STREAM

090070501, Buchanan, IA

Built 1940 Load: 21.1 t ADT: 44

LOCAL RD

Over: BUFFALO CREEK

089073101, Buchanan, IA

Built 1980 Load: 22.4 t ADT: 123

FM

Over: HARTER CR

089092702, Buchanan, IA

Built 1963 Load: 22.4 t ADT: 1,169

FM

Over: OVFLW WAPSIPINICON RVR

089100909, Buchanan, IA

Built 1968 Load: 22.7 t ADT: 687

POSTEL AVE

Over: SMALL STREAM

8808220044, Buchanan, IA

Built 2011 Load: 23.7 t ADT: 69

FM

Over: STREAM

089102802, Buchanan, IA

Built 1951 Load: 24.3 t ADT: 147

LOCAL 240TH ST

Over: SMALL STREAM

088081401, Buchanan, IA

Built 1979 Load: 24.9 t ADT: 82

WB US 20

Over: WAPSIPINICON RIVER

1.5 MI. E OF JCT. IA #150, Buchanan, IA

Built 1978 Load: 24.9 t ADT: 4,150

US 20

Over: DRAINAGE DITCH

4.2 MI. W OF JCT. IA 150, Buchanan, IA

Built 1980 Load: 24.9 t ADT: 10,100

IOWA AVE

Over: SMALL STREAM

087092004, Buchanan, IA

Built 1957 Load: 25.1 t ADT: 35

LOC UNION AVE

Over: SMALL STREAM

090071602, Buchanan, IA

Built 1955 Load: 25.1 t ADT: 30

FM

Over: W BR BUFFALO CREEK

090082103, Buchanan, IA

Built 1957 Load: 25.1 t ADT: 118

FM

Over: BUFFALO CREEK

090082401, Buchanan, IA

Built 1955 Load: 25.1 t ADT: 167

LOC 110TH ST

Over: OTTER CR

090090901, Buchanan, IA

Built 1963 Load: 25.1 t ADT: 47

LOCAL 240TH ST

Over: BUFFALO CREEK

088071703, Buchanan, IA

Built 1986 Load: 25.1 t ADT: 73

330TH ST

Over: LIME CREEK

087102711, Buchanan, IA

Built 1951 Load: 25.4 t ADT: 992

280TH ST

Over: BUFFALO CREEK

087070201, Buchanan, IA

Built 2004 Load: 25.9 t ADT: 51

LOCAL

Over: LITTLE WAPSIPINICON RVR

089100406, Buchanan, IA

Built 1966 Load: 25.9 t ADT: 51

LOCAL

Over: SMALL STREAM

089092104, Buchanan, IA

Built 1969 Load: 26.6 t ADT: 73

FM

Over: HARTER CREEK

089092701, Buchanan, IA

Built 1964 Load: 26.6 t ADT: 825

FM 140TH ST

Over: HUNTER CREEK

090092901, Buchanan, IA

Built 1968 Load: 26.6 t ADT: 108

EB US 20

Over: WAPSIPINICON RIVER

1.5 MI. E OF JCT. IA #150, Buchanan, IA

Built 1978 Load: 26.6 t ADT: 4,150

FM

Over: WAPSIPINICON RIVER

089100907, Buchanan, IA

Built 1968 Load: 27.3 t ADT: 687

FM 150TH ST

Over: BUFFALO CREEK

090073101, Buchanan, IA

Built 1985 Load: 27.3 t ADT: 98

FM

Over: SMALL STREAM

089101007, Buchanan, IA

Built 1965 Load: 28.2 t ADT: 422

FM

Over: W BR BUFFALO CREEK

090081604, Buchanan, IA

Built 1974 Load: 28.6 t ADT: 344

IA 187

Over: LAMONT CREEK

0.2 mi. N of N Jct SR C64, Buchanan, IA

Built 1977 Load: 28.8 t ADT: 2,250

JACKSON AVE

Over: SMALL STREAM

088090904, Buchanan, IA

Built 1976 Load: 28.8 t ADT: 3,103

FM

Over: STREAM

089070702, Buchanan, IA

Built 1968 Load: 29.2 t ADT: 982

KEOKUK AVE

Over: MALONE CR

089091303, Buchanan, IA

Built 2004 Load: 29.2 t ADT: 49

IA 150

Over: STREAM

3.4 mi. S of SR C57, Buchanan, IA

Built 1984 Load: 29.2 t ADT: 3,890

LOCAL FROST AVE

Over: SMALL STREAM

087102304, Buchanan, IA

Built 1976 Load: 29.5 t ADT: 39

FM DENISON AVE

Over: SMALL CREEK

090101501, Buchanan, IA

Built 1998 Load: 29.5 t ADT: 1,650

LOCAL

Over: WEST BRANCH OF PINE CRK

089082003, Buchanan, IA

Built 1988 Load: 29.8 t ADT: 62

FM W45

Over: DRY CREEK

087073302, Buchanan, IA

Built 1974 Load: 30.0 t ADT: 717

FM

Over: W BR PINE CREEK

089080502, Buchanan, IA

Built 1977 Load: 30.0 t ADT: 344

FM

Over: W BR BUFFALO CREEK

090080807, Buchanan, IA

Built 1974 Load: 30.2 t ADT: 334

FM

Over: MALONE CREEK

089092503, Buchanan, IA

Built 1969 Load: 30.4 t ADT: 285

FM QUONSET AVE

Over: W BR BUFFALO CK

090083504, Buchanan, IA

Built 1979 Load: 30.4 t ADT: 98

FM 140TH ST

Over: OTTER CREEK

090092803, Buchanan, IA

Built 1968 Load: 30.4 t ADT: 118

FM 155TH ST

Over: PINE CREEK

090083105, Buchanan, IA

Built 1969 Load: 30.6 t ADT: 59

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 5, 2026