Madison County, IA

221 public highway bridges

Madison County Bridge Snapshot

Madison County, Iowa contains 221 public highway bridges in the FHWA National Bridge Inventory. Roughly 16.3% are rated “Good,” 45.7% “Fair,” 37.6% “Poor,” and 37.6% 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.

221

Total Bridges

16.3%

Good

37.6%

Poor

37.6%

Structurally Deficient

Condition Distribution

Good

16.3% (36)

Fair

45.7% (101)

Poor

37.6% (83)

SD

37.6% (83)

All Bridges (221)

Sort:

SR P-48

Over: I-80

At jct. of SR P48, Madison, IA

Built 1959 ADT: 26,100

LOCAL RD

Over: NORTH RIVER

077272904, Madison, IA

Built 1920 Load: 10.1 t ADT: 40

LOCAL RD

Over: MIDDLE RIVER

075290606, Madison, IA

Built 1930 Load: 10.3 t ADT: 29

LOCAL

Over: NORTH FORK CLANTON CREEK

074271606, Madison, IA

Built 1983 Load: 12.2 t ADT: 11

LOCAL RD

Over: DRAINAGE

076261703, Madison, IA

Built 1978 Load: 12.4 t ADT: 20

FM

Over: NORTH RIVER

077293102, Madison, IA

Built 1930 Load: 12.9 t ADT: 50

LOCAL

Over: BROADHORN CREEK

074260104, Madison, IA

Built 1985 Load: 13.9 t ADT: 26

LOCAL RD

Over: NORTH RIVER

076261104, Madison, IA

Built 1920 Load: 14.3 t ADT: 60

FM

Over: JIM CREEK

077291502, Madison, IA

Built 1962 Load: 14.9 t ADT: 597

FM

Over: DEER CREEK

074271904, Madison, IA

Built 1951 Load: 15.4 t ADT: 50

LOCAL

Over: CEDAR CREEK

076260908, Madison, IA

Built 1958 Load: 15.5 t ADT: 34

FM

Over: CLANTON CREEK

075263207, Madison, IA

Built 1956 Load: 15.7 t ADT: 71

LOCAL RD

Over: JONES CREEK

075262104, Madison, IA

Built 1975 Load: 16.0 t ADT: 5

LOCAL

Over: STREAM

077273302, Madison, IA

Built 1981 Load: 16.1 t ADT: 60

LOCAL RD

Over: NORTH RIVER

076290502, Madison, IA

Built 1962 Load: 17.5 t ADT: 20

LOCAL RD

Over: DRAINAGE

074291201, Madison, IA

Built 1977 Load: 17.8 t ADT: 20

LOCAL RD

Over: MIDDLE RIVER

076273605, Madison, IA

Built 1960 Load: 18.1 t ADT: 71

FM

Over: STREAM

077261301, Madison, IA

Built 1936 Load: 18.1 t ADT: 1,714

FM

Over: NORTH RIVER

077273602, Madison, IA

Built 1961 Load: 18.1 t ADT: 50

LOCAL RD

Over: DRAINAGE

076290402, Madison, IA

Built 1962 Load: 18.2 t ADT: 15

LOCAL RD

Over: NORTH RIVER

077273412, Madison, IA

Built 1966 Load: 18.8 t ADT: 29

FM

Over: WATERWAY

074263503, Madison, IA

Built 1949 Load: 19.2 t ADT: 259

LOCAL RD

Over: CLANTON CREEK

074271007, Madison, IA

Built 1974 Load: 19.4 t ADT: 20

FM

Over: MIDDLE RIVER

075281510, Madison, IA

Built 1981 Load: 19.4 t ADT: 180

FM

Over: S FORK CLANTON CREEK

074272204, Madison, IA

Built 1979 Load: 20.0 t ADT: 60

LOCAL RD

Over: CLANTON CREEK

075262702, Madison, IA

Built 1978 Load: 20.0 t ADT: 40

FM

Over: NORTH RIVER

076281802, Madison, IA

Built 1949 Load: 20.0 t ADT: 477

LOCAL

Over: DRAINAGE

077292502, Madison, IA

Built 1960 Load: 20.3 t ADT: 26

FIELD ENTRANCE

Over: SIDE DITCH

075270806, Madison, IA

Built 1940 Load: 20.4 t ADT: 10

LOCAL RD

Over: MIDDLE RIVER

075281706, Madison, IA

Built 1976 Load: 20.4 t ADT: 26

LOCAL

Over: JONES CREEK

075272808, Madison, IA

Built 1985 Load: 21.0 t ADT: 71

LOCAL

Over: HOWERDON CREEK

076282004, Madison, IA

Built 1978 Load: 21.0 t ADT: 29

LOCAL

Over: NORTH CLANTON CREEK

074280605, Madison, IA

Built 1988 Load: 21.2 t ADT: 20

FM

Over: STREAM

077271404, Madison, IA

Built 1960 Load: 21.4 t ADT: 71

LOCAL RD

Over: DRAINAGE

076261403, Madison, IA

Built 1946 Load: 22.0 t ADT: 20

FM

Over: CEDAR CREEK

076272011, Madison, IA

Built 1964 Load: 22.1 t ADT: 259

LOCAL

Over: N FORK CLANTON CREEK

074270706, Madison, IA

Built 1985 Load: 22.3 t ADT: 100

LOCAL RD

Over: NORTH RIVER

076270201, Madison, IA

Built 1981 Load: 22.3 t ADT: 110

FM

Over: CEDAR CREEK

076272304, Madison, IA

Built 1962 Load: 22.3 t ADT: 89

FM

Over: BADGER CREEK

077271104, Madison, IA

Built 1960 Load: 22.3 t ADT: 131

LOCAL RD

Over: NORTH RIVER

077272802, Madison, IA

Built 1975 Load: 22.3 t ADT: 131

LOCAL RD

Over: DRAINAGE

075292801, Madison, IA

Built 1959 Load: 22.5 t ADT: 11

LOCAL

Over: SMALL

077280204, Madison, IA

Built 1942 Load: 22.5 t ADT: 50

FM

Over: FIELD DRAINAGE DITCH

074263603, Madison, IA

Built 1949 Load: 23.0 t ADT: 259

US 169

Over: DRAINAGE DITCH

0.6 MI. N OF Jct. SR G-68, Madison, IA

Built 1976 Load: 23.2 t ADT: 1,890

FM

Over: DRAINAGE

074270708, Madison, IA

Built 1978 Load: 23.5 t ADT: 60

LOCAL

Over: DRAINAGE

077282702, Madison, IA

Built 1949 Load: 23.6 t ADT: 50

LOCAL RD

Over: MIDDLE RIVER

076293102, Madison, IA

Built 1959 Load: 24.2 t ADT: 40

FM

Over: OVERFLOW N.RIVER

077273602, Madison, IA

Built 1961 Load: 24.3 t ADT: 50

LOCAL

Over: DRAINAGE

076293301, Madison, IA

Built 1938 Load: 24.6 t ADT: 29

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