Decatur County, IA

178 public highway bridges

Decatur County Bridge Snapshot

Decatur County, Iowa contains 178 public highway bridges in the FHWA National Bridge Inventory. Roughly 19.7% are rated “Good,” 32.6% “Fair,” 44.4% “Poor,” and 44.4% 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.

178

Total Bridges

19.7%

Good

44.4%

Poor

44.4%

Structurally Deficient

Condition Distribution

Good

19.7% (35)

Fair

32.6% (58)

Poor

44.4% (79)

SD

44.4% (79)

All Bridges (178)

Sort:

NB I-35

Over: 324TH STREET

AT MISSOURI STATE LINE, Decatur, IA

Built 1970 ADT: 195

NB I-35

Over: 310TH ST

2.5 mi. S of US 69, Decatur, IA

Built 1970 ADT: 65

198TH STREET

Over: I-35

1.3 mi. N of Jct. IA 2, Decatur, IA

Built 1969 ADT: 14,600

FM

Over: I 35

4.5 mi. N of Jct. IA 2, Decatur, IA

Built 1969 ADT: 14,600

J14

Over: I-35

At the Jct. SR J14, Decatur, IA

Built 1968 ADT: 15,100

REST AREA ROAD

Over: REST AREA ROAD

3.0 MI. N OF Jct. U.S. 69, Decatur, IA

Built 1994 ADT: 13,800

LOCAL

Over: S ELK CREEK

068271601, Decatur, IA

Built 2011 Load: 11.1 t ADT: 11

LOCAL

Over: INDIAN CREEK

067262005, Decatur, IA

Built 1905 Load: 12.4 t ADT: 5

LOCAL

Over: JONATHAN CREEK

070243102, Decatur, IA

Built 1965 Load: 13.9 t ADT: 35

LOCAL

Over: BRITTON BRANCH

068261205, Decatur, IA

Built 2000 Load: 14.3 t ADT: 15

FM

Over: LONG CREEK

070263205, Decatur, IA

Built 1957 Load: 14.5 t ADT: 627

FM

Over: BRUSH CREEK

069273606, Decatur, IA

Built 1954 Load: 15.0 t ADT: 60

LOCAL

Over: JONATHAN CREEK

070252604, Decatur, IA

Built 1996 Load: 15.1 t ADT: 15

FM

Over: STREAM

068262601, Decatur, IA

Built 1968 Load: 15.5 t ADT: 20

LOCAL

Over: LONG CREEK

069260503, Decatur, IA

Built 1984 Load: 15.8 t ADT: 21

LOCAL

Over: TURKEY RUN

068240302, Decatur, IA

Built 1951 Load: 16.0 t ADT: 5

FM

Over: HOG CREEK

068242506, Decatur, IA

Built 1955 Load: 16.0 t ADT: 20

LOCAL

Over: S ELK CREEK

068270903, Decatur, IA

Built 2002 Load: 16.0 t ADT: 11

FM

Over: ELK CREEK

069270503, Decatur, IA

Built 1950 Load: 16.0 t ADT: 26

FM

Over: ELK CREEK

069270805, Decatur, IA

Built 2000 Load: 16.2 t ADT: 26

LOCAL

Over: ELK CREEK

069272803, Decatur, IA

Built 1957 Load: 16.9 t ADT: 62

LOCAL

Over: KILGORE

067251204, Decatur, IA

Built 2001 Load: 17.1 t ADT: 41

FM

Over: LITTLE RIVER

068253303, Decatur, IA

Built 1957 Load: 17.1 t ADT: 40

LOCAL

Over: TRIB TO GRAND RIVER

069270203, Decatur, IA

Built 1969 Load: 17.1 t ADT: 26

FM

Over: STREAM

069263002, Decatur, IA

Built 1998 Load: 17.2 t ADT: 40

290TH AVE

Over: WELDON CREEK

070241702, Decatur, IA

Built 2012 Load: 17.2 t ADT: 29

LOCAL

Over: STEEL CREEK

069243603, Decatur, IA

Built 1989 Load: 17.3 t ADT: 5

LOCAL

Over: KILGORE CREEK

068252603, Decatur, IA

Built 2001 Load: 17.4 t ADT: 51

LOCAL

Over: STREAM

068262701, Decatur, IA

Built 1967 Load: 18.1 t ADT: 11

LOCAL

Over: STREAM

069242502, Decatur, IA

Built 1910 Load: 18.4 t ADT: 15

LOCAL

Over: STREAM

068252908, Decatur, IA

Built 1958 Load: 18.8 t ADT: 51

FM

Over: GRAND RIVER

070273403, Decatur, IA

Built 1956 Load: 18.9 t ADT: 627

FM

Over: DICKENSON BRANCH

067261104, Decatur, IA

Built 1963 Load: 19.5 t ADT: 329

LOCAL

Over: STREAM

068243402, Decatur, IA

Built 2002 Load: 21.1 t ADT: 15

US 69

Over: LITTLE RIVER

3.8 MI. N OF SR J66, Decatur, IA

Built 1953 Load: 22.3 t ADT: 820

FM

Over: WELDON RIVER

067242201, Decatur, IA

Built 1951 Load: 22.6 t ADT: 170

LOCAL

Over: SMALL STREAM

068252806, Decatur, IA

Built 1997 Load: 22.7 t ADT: 30

FM

Over: STEEL CREEK

068241403, Decatur, IA

Built 1984 Load: 24.5 t ADT: 10

FM

Over: GRAND RIVER

069262007, Decatur, IA

Built 1967 Load: 26.8 t ADT: 29

LOCAL

Over: KILGORE CREEK

068251003, Decatur, IA

Built 1994 Load: 27.8 t ADT: 5

IA 2

Over: MCGRUDER CREEK

1.5 MI. E OF E JCT US 69, Decatur, IA

Built 1984 Load: 29.0 t ADT: 1,720

FIELD ENTRANCE

Over: SIDE DITCH

067261004, Decatur, IA

Built 1994 Load: 29.2 t ADT: 10

NB I-35

Over: GRAND RIVER

3.1 mi. N of Jct. US 69, Decatur, IA

Built 1970 Load: 29.8 t ADT: 7,550

IA 2

Over: ELK CREEK

0.3 MI. W OF SR R18, Decatur, IA

Built 1985 Load: 30.3 t ADT: 1,350

IA 2

Over: W BRANCH LITTLE RIVER

1.2 MI. W OF W JCT. US 69, Decatur, IA

Built 1986 Load: 30.5 t ADT: 1,960

LOCAL

Over: SHANE CREEK

067271701, Decatur, IA

Built 1978 Load: 31.5 t ADT: 30

FM

Over: LICK BRANCH

067241703, Decatur, IA

Built 1989 Load: 32.7 t ADT: 170

FM

Over: STREAM

067242103, Decatur, IA

Built 1990 Load: 32.7 t ADT: 170

FM

Over: TURKEY RUN CREEK

068240504, Decatur, IA

Built 1992 Load: 32.7 t ADT: 15

FM

Over: LITTLE RIVER

069250601, Decatur, IA

Built 1979 Load: 32.7 t ADT: 428

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