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:

44TH STREET

Over: WANATEE CREEK

083060500, Linn, IA

Built 1980 Load: 32.7 t ADT: 8,192

8TH AVENUE

Over: WANATEE CREEK

083060400, Linn, IA

Built 2003 Load: 32.7 t ADT: 510

BOYSON RD

Over: TRIBUTARY OF DRY CREEK

084073500, Linn, IA

Built 1976 Load: 32.7 t ADT: 13,287

SB I-380

Over: CC RR & ASH PIT

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

Built 1979 Load: 32.7 t ADT: 41,000

SE RAMP I-380

Over: OVER CC RR & TRAIL

0.2 mi. S of Jct. IA 100, Linn, IA

Built 1982 Load: 32.7 t ADT: 7,700

US 151

Over: CREEK

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

Built 1960 Load: 32.7 t ADT: 22,400

I 380 SB

Over: EAST BLUE CREEK

2.3 mi. N of Jct. SR W35, Linn, IA

Built 1982 Load: 32.9 t ADT: 10,750

E CEMETERY RD

Over: TRIB TO PRAIRIE CREEK

082081111, Linn, IA

Built 1981 Load: 33.0 t ADT: 187

OTIS RD

Over: INDIAN CREEK

083063017, Linn, IA

Built 2006 Load: 33.0 t ADT: 353

PRAIRIEBURG RD

Over: BUFFALO CREEK

085050306, Linn, IA

Built 1974 Load: 33.5 t ADT: 520

BLAIRS FERRY RD

Over: RED CEDAR RIVER

084082105, Linn, IA

Built 1984 Load: 33.7 t ADT: 4,419

BLAIRS FERRY RD

Over: MUD LAKE

084082205, Linn, IA

Built 1984 Load: 33.7 t ADT: 4,419

NB I-380

Over: CC RR & ASH PIT

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

Built 1979 Load: 33.9 t ADT: 32,300

BLAIRSFERRY RD

Over: OTTER CREEK

084082604, Linn, IA

Built 1971 Load: 34.3 t ADT: 5,401

WB US 30

Over: CEDAR RIVER

0.5 mi. W of E Jct US 151, Linn, IA

Built 1975 Load: 34.5 t ADT: 11,750

BOYSCOUTS RD

Over: WAPSIPINICON RIVER

085052003, Linn, IA

Built 1976 Load: 34.7 t ADT: 226

LEWIS ACCESS RD

Over: CEDAR RIVER

085082004, Linn, IA

Built 1961 Load: 35.6 t ADT: 1,866

EB US 30

Over: OVER CIC RR SPUR

0.8 mi. W of E Jct US 218, Linn, IA

Built 1980 Load: 35.6 t ADT: 15,750

33RD AVE

Over: CRANDIC RR

000000000, Linn, IA

Built 2006 Load: 35.8 t ADT: 10,700

SUTLIFF RD

Over: SPRING CREEK

082052404, Linn, IA

Built 1962 Load: 36.0 t ADT: 610

SAWYER RD

Over: SAWYER CREEK

085060105, Linn, IA

Built 1925 Load: 36.0 t ADT: 1,100

MONTICELLO RD

Over: TRIB BOULDER CR

086050901, Linn, IA

Built 1960 Load: 36.0 t ADT: 530

TROY MILLS RD

Over: TRIB.TO WAPSIPINICON R

086071704, Linn, IA

Built 1925 Load: 36.0 t ADT: 1,424

NB IA 13

Over: EAST INDIAN CREEK

2.1 mi. N of Jct. SR E34, Linn, IA

Built 1973 Load: 36.2 t ADT: 3,600

ELY RD

Over: ABANDONED RR

082071101, Linn, IA

Built 1976 Load: 36.3 t ADT: 5,095

SAWYER RD

Over: BUFFALO CREEK

085050505, Linn, IA

Built 1973 Load: 36.3 t ADT: 1,100

NB I-380

Over: WEST OTTER CREEK

2.7 mi. N of jct. SR E34, Linn, IA

Built 1983 Load: 36.3 t ADT: 12,850

ARTESIAN RD

Over: INDIAN CREEK

084062000, Linn, IA

Built 1999 Load: 36.7 t ADT: 60

WRIGHT BROS BLV

Over: HOOSIER CREEK

082072603, Linn, IA

Built 1985 Load: 37.4 t ADT: 1,728

MILLER ROAD

Over: TOWER CREEK

000000000, Linn, IA

Built 1996 Load: 37.6 t ADT: 2,740

WINSLOW RD

Over: TRIB INDIAN CREEK

084061900, Linn, IA

Built 1999 Load: 37.8 t ADT: 1,129

I 380 SB

Over: EAST OTTER CREEK

1.3 MI. N S.R. E34, Linn, IA

Built 1983 Load: 38.0 t ADT: 12,850

EB US 30

Over: OVER CIC RR

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

Built 1979 Load: 38.8 t ADT: 15,750

WB US 30

Over: OVER CIC RR SPUR

0.8 mi. W of E Jct US 218, Linn, IA

Built 1980 Load: 39.0 t ADT: 15,750

FRONT DR.

Over: OTTER CREEK

084081233, Linn, IA

Built 1990 Load: 39.5 t ADT: 923

WB COLL IA 100

Over: OVER CC RR & BIKE TRAIL

0.1 MI. N OF JCT. IA #100, Linn, IA

Built 1982 Load: 41.3 t ADT: 10,300

URBANA RD

Over: WEST BLUE CREEK

085080607, Linn, IA

Built 1987 Load: 41.5 t ADT: 1,257

MARTELLE RD

Over: ELBOW CREEK

083051201, Linn, IA

Built 1977 Load: 44.6 t ADT: 363

JAPPA RD.

Over: PLEASANT RUN

082060806, Linn, IA

Built 1997 Load: 45.4 t ADT: 1,061

UPPR BOULDER RD

Over: BOULDER CREEK

086051601, Linn, IA

Built 1992 Load: 46.2 t ADT: 20

WB US 30

Over: PLEASANT RUN

1.8 mi. W of Jct US 151, Linn, IA

Built 1975 Load: 46.9 t ADT: 11,750

SB US 151

Over: CRAB APPLE CREEK

2.9 MI. N OF N JCT. IA 13, Linn, IA

Built 1992 Load: 47.4 t ADT: 7,000

BOYSON RD

Over: DRY CREEK

000000000, Linn, IA

Built 2000 Load: 48.3 t ADT: 14,100

FIRST ST

Over: UP RR

Mt Vernon Road, Linn, IA

Built 1934 Load: 48.9 t ADT: 2,532

INDIAN BR.RD.

Over: INDAIN CREEK

085063201, Linn, IA

Built 1997 Load: 49.9 t ADT: 33

SB IA 13

Over: OVER CC RR

0.4 MI S OF S JCT. SR E16, Linn, IA

Built 1973 Load: 51.4 t ADT: 3,600

TODD HILLS RD

Over: OTTER CREEK

084082403, Linn, IA

Built 1997 Load: 52.4 t ADT: 59

ELLIS RD

Over: MORGAN CREEK

083081405, Linn, IA

Built 1996 Load: 52.9 t ADT: 1,403

C AVE N.E.

Over: DRY CREEK

084071510, Linn, IA

Built 1992 Load: 52.9 t ADT: 1,453

LINN-BENTON RD.

Over: MORGAN CREEK

082080602, Linn, IA

Built 1993 Load: 57.3 t ADT: 147

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