Linn County, IA

428 public highway bridges

Linn County Bridge Snapshot

Linn County, Iowa contains 428 public highway bridges in the FHWA National Bridge Inventory. Roughly 40% are rated “Good,” 33.6% “Fair,” 4.7% “Poor,” and 4.7% 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.

428

Total Bridges

40%

Good

4.7%

Poor

4.7%

Structurally Deficient

Condition Distribution

Good

40% (171)

Fair

33.6% (144)

Poor

4.7% (20)

SD

4.7% (20)

All Bridges (428)

Sort:

FROZEN HILL RD

Over: BUFFALO CREEK

085051302, Linn, IA

Built 1951 Load: 22.0 t ADT: 49

LOCAL

Over: TRIB BUFFALO CREEK

086060301, Linn, IA

Built 1994 Load: 22.0 t ADT: 88

WB US 30

Over: CIC RR

0.8 MI. W OF JCT. I-380, Linn, IA

Built 1979 Load: 22.4 t ADT: 15,000

BLAIRSFERRY RD

Over: TRIB TO CEDAR RIVER

000000000, Linn, IA

Built 1968 Load: 22.7 t ADT: 9,300

50TH AVE SOUTHWEST

Over: DRAINAGE DITCH

087070905, Linn, IA

Built 1960 Load: 22.7 t ADT: 1,949

US 30 & 151

Over: DRAINAGE DITCH

0.3 mi. E of Jct. I-380, Linn, IA

Built 1975 Load: 22.9 t ADT: 22,500

CLUB RD

Over: SOUTH HOOSIER CREEK

082072706, Linn, IA

Built 1979 Load: 23.7 t ADT: 913

SPRINGVILLE RD

Over: ABBE CREEK

082050302, Linn, IA

Built 1960 Load: 24.3 t ADT: 845

PARIS RD

Over: WAPSIPINICON RIVER

086062901, Linn, IA

Built 1954 Load: 24.6 t ADT: 344

MORGAN BR RD

Over: MORGAN CREEK

083082802, Linn, IA

Built 1987 Load: 25.0 t ADT: 34

URBANA RD

Over: EAST BLUE CREEK

085080805, Linn, IA

Built 1987 Load: 25.3 t ADT: 1,257

NORTH ST

Over: DRY CREEK

000000000, Linn, IA

Built 1959 Load: 25.8 t ADT: 530

IA 100

Over: WANATEE CREEK

0.4 MI. W OF JCT. IA 13, Linn, IA

Built 1995 Load: 25.9 t ADT: 14,000

TROY MILLS RD

Over: WAPSIPINICON RIVER

086070522, Linn, IA

Built 1951 Load: 26.2 t ADT: 2,033

COVINGTON RD

Over: DRY CREEK

000000000, Linn, IA

Built 1955 Load: 26.6 t ADT: 3,107

LINN-BENTON RD

Over: KNAPP CREEK

082083108, Linn, IA

Built 1972 Load: 26.6 t ADT: 730

LUCORE RD

Over: INDIAN CR

084061914, Linn, IA

Built 1972 Load: 26.6 t ADT: 2,445

CENTRAL CITY RD

Over: EAST OTTER CREEK

085071101, Linn, IA

Built 1962 Load: 26.6 t ADT: 982

PARIS RD

Over: RIVER BEND CREEK

086072501, Linn, IA

Built 1963 Load: 26.6 t ADT: 344

ALBURNETT RD

Over: RIVER BEND CREEK

086072502, Linn, IA

Built 1963 Load: 26.6 t ADT: 462

6TH ST

Over: OVER UP RR

000000000, Linn, IA

Built 1948 Load: 26.8 t ADT: 9,391

LINN BUCHANAN

Over: DEAD DOG RUN

086070303, Linn, IA

Built 1949 Load: 27.5 t ADT: 44

NB I-380

Over: CC RR

2.6 MI. S OF JCT. 100, Linn, IA

Built 1980 Load: 27.5 t ADT: 38,800

IA 13

Over: HEATON'S CREEK

2.6 mi. S of S Jct SR D62, Linn, IA

Built 1976 Load: 27.8 t ADT: 5,600

MT.VERNON RD

Over: BIG CREEK

083062601, Linn, IA

Built 1984 Load: 27.8 t ADT: 1,669

MT VERNON RD

Over: WANATEE CREEK

083062909, Linn, IA

Built 1969 Load: 27.9 t ADT: 7,169

ANDERSON RD

Over: BUFFALO CREEK

085052403, Linn, IA

Built 1981 Load: 28.2 t ADT: 88

7TH AVE

Over: INDIAN CREEK

083070100, Linn, IA

Built 1994 Load: 28.3 t ADT: 20,679

UP-BOULDER RD

Over: TRIB TO SILVER CREEK

086051301, Linn, IA

Built 1986 Load: 28.4 t ADT: 20

GLASS RD

Over: OVER CC RR & MCCLOUD RUN

000000000, Linn, IA

Built 1980 Load: 29.4 t ADT: 5,700

NB I-380

Over: OVER UP RR

1.0 MI. N OF JCT. US 30, Linn, IA

Built 1974 Load: 30.1 t ADT: 31,400

LINN-BENTON RD

Over: TRIB TO KNAPP CREEK

Benton-Linn Road, Linn, IA

Built 1972 Load: 30.5 t ADT: 1,530

IA 13

Over: WAPSIPINICON RIVER

IN CENTRAL CITY, Linn, IA

Built 1973 Load: 30.7 t ADT: 5,600

INK ROAD

Over: TRIB TO ABBE CREEK

082050306, Linn, IA

Built 1987 Load: 30.8 t ADT: 128

COTTAGE GR.PWY

Over: WANATEE CREEK

083062101, Linn, IA

Built 1984 Load: 30.8 t ADT: 864

WESTWOOD DR NW

Over: VINTON DITCH

000000000, Linn, IA

Built 1979 Load: 30.9 t ADT: 472

C ST RD

Over: S HOOSIER CR

082072604, Linn, IA

Built 1985 Load: 31.2 t ADT: 128

SPANISH RD

Over: SOUTH HOOSIER CREEK

082073602, Linn, IA

Built 1987 Load: 31.4 t ADT: 137

OLD RIVER RD

Over: PLEASANT RUN CR.

082060805, Linn, IA

Built 1985 Load: 31.8 t ADT: 207

IVANHOE RD

Over: PLEASANT RUN CK

082061803, Linn, IA

Built 1985 Load: 31.8 t ADT: 511

MT VERNON RD

Over: INDIAN CREEK

083062901, Linn, IA

Built 1969 Load: 32.1 t ADT: 7,169

SB I-380

Over: CC RR

2.6 MI. S OF JCT.100, Linn, IA

Built 1980 Load: 32.1 t ADT: 38,800

GRANT ST

Over: DRAINAGE

000000000, Linn, IA

Built 1977 Load: 32.3 t ADT: 2,455

CHAIN BRIDGE ROAD

Over: LONE TREE CREEK

000000000, Linn, IA

Built 1984 Load: 32.3 t ADT: 171

IA 922-1ST AVE

Over: CEDAR RIVER

0.2 MI. N OF I-380, Linn, IA

Built 1920 Load: 32.7 t ADT: 13,000

GREEN RIDGE RD

Over: CLEAR CREEK

082053606, Linn, IA

Built 1992 Load: 32.7 t ADT: 59

C ST RD

Over: HOOSIER CREEK

082072302, Linn, IA

Built 1984 Load: 32.7 t ADT: 1,099

CEDAR RIDGE RD.

Over: BLUE CREEK

085080703, Linn, IA

Built 1989 Load: 32.7 t ADT: 147

STATE ST

Over: APPLE CREEK

State Street, Linn, IA

Built 1989 Load: 32.7 t ADT: 232

OAK CREEK DR NW

Over: DRAINAGE

000000000, Linn, IA

Built 1993 Load: 32.7 t ADT: 40

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 6, 2026