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:

16TH AVE EB

Over: UP RR & STREET

C65750560, Linn, IA

Built 1937 ADT: 1,795

12TH AVE

Over: CEDAR RIVER & RD

083072812, Linn, IA

Built 1974 ADT: 650

A AVE

Over: 4TH ST & RR

000000000, Linn, IA

Built 1974 ADT: 2,160

WRIGHT BROS BLV

Over: I-380

2.5 MI S. OF JCT. US 30, Linn, IA

Built 1971 ADT: 45,700

WALFORD RD.

Over: I 380

3.5 MI. S OF JCT. US 30, Linn, IA

Built 1971 ADT: 52,700

I 380 RAMP

Over: RAMP F OVER I-380

0.2 MI. N OF JCT. 30, Linn, IA

Built 1975 ADT: 41,800

NB I-380

Over: CIC RR & CITY ST

0.7 mi. N of Jct. US 30, Linn, IA

Built 1975 ADT: 815

SB I-380

Over: CIC RR & CITY ST

0.7 MI. N OF JCT. 30, Linn, IA

Built 1975 ADT: 1,315

6TH ST.SW.

Over: US 30

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

Built 1975 ADT: 25,800

KIRKWOOD BLVD

Over: US 30

0.7 mi. E of jct. US 218, Linn, IA

Built 1975 ADT: 31,900

J ST

Over: US 30

0.2 MI. E OF JCT. I-380, Linn, IA

Built 1975 ADT: 22,500

I-380 RAMP F EB

Over: US 30 & 151

0.3 MI. E OF JCT. 380, Linn, IA

Built 1975 ADT: 22,500

EB RAMP F

Over: J STREET SW

0.2 MI. E OF US 30/I-380, Linn, IA

Built 1975 ADT: 4,240

30 W TO 380 N RAMP

Over: J ST SW

0.4 MI. E OF JCT. 30/380, Linn, IA

Built 1975 ADT: 4,240

C STREET

Over: US 30

1.6 MI. E OF JCT. I-380, Linn, IA

Built 1976 ADT: 17,300

NB I 380

Over: 33RD AVE

1.3 mi. N of Jct. U.S. 30, Linn, IA

Built 1974 ADT: 3,550

SB I-380

Over: 33RD AVE

1.3 mi. N of Jct. U.S. 30, Linn, IA

Built 1974 ADT: 3,550

I 380 NB

Over: IA 922

AT JCT. BUS. U.S. 151, Linn, IA

Built 1979 ADT: 8,450

I 380 SB

Over: IA 922

AT JCT. BUS. U.S. 151, Linn, IA

Built 1979 ADT: 860

NB I-380

Over: CITY STREETS AND RR

0.6 MI. N OF JCT. IA 922, Linn, IA

Built 1979 ADT: 985

SB I-380

Over: CITY STREETS & RR

0.6 MI. N OF JCT. IA 922, Linn, IA

Built 1979 ADT: 150

I-380

Over: E AND F AVE NW CEDAR RVR

0.3 mi N. US 151(1st Ave), Linn, IA

Built 1979 ADT: 6,900

7TH ST NE

Over: I-380

0.9 MI. N OF Jct. IA #922, Linn, IA

Built 1972 ADT: 64,500

8TH ST NE

Over: I-380

1.1 mi. N Jct. IA 922, Linn, IA

Built 1972 ADT: 64,500

I 380 NB OFF RAMP

Over: 3RD ST NW

0.1 MI. N OF JCT. US 151, Linn, IA

Built 1979 ADT: 1,140

RAMP BR D-3

Over: CITY ST R.O.W

0.2 MI. N OF JCT. 151, Linn, IA

Built 1979 ADT: 1,140

I 380 SB ON RAMP

Over: 2ND ST NE

0.4 mi. N of Jct. US 151, Linn, IA

Built 1979 ADT: 300

I 380 SB OFF RAMP

Over: 2ND ST NE

3.9 mi. N of Jct. US 30, Linn, IA

Built 1979 ADT: 300

I 380 NB ON RAMP

Over: 2ND ST NE

0.6 MI. N OF JCT. US 151, Linn, IA

Built 1979 ADT: 4,374

NB US 151/922

Over: US 30 W JCT

AT JCT. 30, Linn, IA

Built 1980 ADT: 6,700

SB US 151/922

Over: US 30 W JCT

AT JCT. U.S. 30, Linn, IA

Built 1980 ADT: 6,700

EDGEWOOD RD

Over: US 30

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

Built 1980 ADT: 23,400

US 30 EB

Over: UP RR, 21ST ST SW, CREEK

1.9 MI. W OF JCT. 218, Linn, IA

Built 1980 ADT: 130

US 30 WB

Over: UP RR, 21ST ST SW, CREEK

1.6 MI.W.OF E.JCT.218, Linn, IA

Built 1980 ADT: 130

NB I-380

Over: H AVE NE

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

Built 1980 ADT: 3,100

SB I-380

Over: H AVE NE

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

Built 1980 ADT: 3,100

NB I 380

Over: J AVE NE

2.0 mi. S of Jct. IA #100, Linn, IA

Built 1980 ADT: 880

SB I-380

Over: J AVE NE

2.0 mi. S of Jct. IA #100, Linn, IA

Built 1980 ADT: 850

NB I-380

Over: COLDSTREAM AVE NE

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

Built 1980 ADT: 905

SB I-380

Over: COLDSTREAM AVE NE

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

Built 1980 ADT: 905

GLASS RD

Over: I-380

1.1 mi. S OF JCT. IA 100, Linn, IA

Built 1980 ADT: 70,600

IA 100

Over: CENTER POINT RD

0.2 MI. E OF JCT. 380, Linn, IA

Built 1981 ADT: 12,500

NB I-380

Over: 42ND ST

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

Built 1981 ADT: 2,155

SB I-380

Over: 42ND ST

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

Built 1981 ADT: 2,155

EB COLL IA 100

Over: I-380

0.1 mi. S of IA 100, Linn, IA

Built 1982 ADT: 49,200

IA 100

Over: I-380 & RR

At the Jct. I-380, Linn, IA

Built 1982 ADT: 49,200

WB COLL IA 100

Over: I-380

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

Built 1982 ADT: 49,200

BLAIRSFERRY RD

Over: I 380

0.6 MI. N OF JCT. IA 100, Linn, IA

Built 1980 ADT: 32,800

EMMONS ST

Over: I-380

0.9 MI. N OF JCT. 100, Linn, IA

Built 1980 ADT: 41,700

BOYSON ROAD

Over: I-380

1.4 MI. N OF JCT.100, Linn, IA

Built 1982 ADT: 26,300

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