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:

WB 15TH AVE

Over: UP RR & STREET

000000000, Linn, IA

Built 1983 ADT: 1,375

TOWER TERRACE EB

Over: I 380

2.4 mi. S Jct. SR E34, Linn, IA

E-34 -TODDVILLE

Over: I 380

AT JCT. SR E34, Linn, IA

Built 1983 ADT: 24,100

MIDWAY RD

Over: I-380

0.9 mi. north of SR E34, Linn, IA

Built 1983 ADT: 25,900

HAGERMAN RD

Over: I-380

2.3 MI. N OF SR E34, Linn, IA

Built 1983 ADT: 25,900

QUAIL RIDGE RD

Over: I-380

3.0 MI. S OF SR W36, Linn, IA

Built 1983 ADT: 25,900

BOAR RD

Over: I-380

1.6 MI. S OF S.R. W36, Linn, IA

Built 1983 ADT: 25,900

SR W-36

Over: I-380

AT JCT. S.R. W36, Linn, IA

Built 1983 ADT: 19,900

CEDAR RIDGE RD

Over: I-380

1.5 mi. N of jct. SR W36, Linn, IA

Built 1982 ADT: 22,200

SR E2W

Over: I-380

3.6 MI. N OF SR W36, Linn, IA

Built 1984 ADT: 22,200

STONEY POINT RD

Over: US 30 & US 218

0.8 MI. W OF JCT. US 151, Linn, IA

Built 1985 ADT: 16,100

W42 80TH ST SW

Over: US 30

80TH ST. SW OVER US 30, Linn, IA

Built 2018 ADT: 13,100

RAMP B TO 16TH

Over: US 30

2.5 MI. W OF JCT. US 151, Linn, IA

Built 1985 ADT: 12,000

I 380 NB OFF RAMP

Over: 8TH AVE SW

0.5 mi. S Jct. IA 922, Linn, IA

Built 1975 ADT: 8,730

I 380 NB

Over: US 30

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

Built 1975 ADT: 11,250

I 380 SB

Over: US 30

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

Built 1975 ADT: 11,050

27TH AVE

Over: I-380

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

Built 1975 ADT: 65,300

WILSON AVE

Over: I-380

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

Built 1972 ADT: 59,600

76TH AVE SW

Over: I-380

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

Built 1975 ADT: 56,400

I 380 NB

Over: 15TH & 16TH AV SW

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

Built 1975 ADT: 2,800

I 380 SB

Over: 15TH & 16TH AVE SW

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

Built 1975 ADT: 2,800

NB I-380

Over: CIC RR & 8TH AVE

0.8 mi. S of Jct. IA #922, Linn, IA

Built 1973 ADT: 4,365

I 380 SB

Over: CIC RR & 8TH AVE

0.8 mi. S of Jct. IA #922, Linn, IA

Built 1975 ADT: 3,010

NB I-380

Over: 5TH AVE SW

0.3 mi. S of Jct. IA 922, Linn, IA

Built 1975 ADT: 1,710

SB I-380

Over: 5TH AVE SW

0.3 mi. S of IA 922, Linn, IA

Built 1975 ADT: 1,710

IA 100 EB

Over: OLD FERRY RD

1.0 MI NW OF JCT CR W36, Linn, IA

Built 2016 ADT: 25

EDGEWOOD RD

Over: IA 100

EDGEWOOD ROAD OVER IA 100, Linn, IA

Built 2016 ADT: 6,100

US 30 WB

Over: WILLOW CREEK ROAD

0.9 MI W US30/IA1 INTCHG, Linn, IA

Built 2018 ADT: 20

US 30 WB

Over: IA 1

US 30 and IA 1 INTCHG, Linn, IA

Built 2019 ADT: 4,000

US 30 EB

Over: IA 1

US 30 and IA 1 INTCHG, Linn, IA

Built 2019 ADT: 4,000

STANDING ROCK ROAD

Over: US 30

1.6 mi E IA1/US30 Intrchg, Linn, IA

Built 2018 ADT: 5,400

SUTLIFF RD

Over: US 30

2.3MI. E of IA1 and US30, Linn, IA

Built 2017 ADT: 5,400

GREEN RIDGE ROAD

Over: US 30

2.8 Mi. E of Jct. IA 1, Linn, IA

Built 2018 ADT: 5,400

LISBON BOULEVARD

Over: US 30

3.5 mi. E US30/IA1 INTCHG, Linn, IA

Built 2019 ADT: 4,370

IA 100 EB

Over: US 30WB/US 218NB ON RAMP

US 30 RAMP D, Linn, IA

Built 2018 ADT: 2,110

IA 100 WB

Over: US 30

US 30 RAMP H, Linn, IA

Built 2018 ADT: 13,100

IA 100WB TO US30EB

Over: US 30 EB TO IA 100 EB

1 mi S IA100/SR E48 INTCH, Linn, IA

Built 2018 ADT: 1,000

IA 100 EB

Over: 16TH AVE ACCESS

IA-100/US-30 INTERCHANGE, Linn, IA

Built 2017 ADT: 18

IA 100 WB

Over: 16TH AVE ACCESS RD

IA-100/US-30 INTERCHANGE, Linn, IA

Built 2017 ADT: 18

E 48 E AVE

Over: IA 100

IA100 & SR E48 INTCHG., Linn, IA

Built 2018 ADT: 3,300

IA 100 EB

Over: ELLIS RD SILVER CREEK

2.8 Mi. N of US 218/30, Linn, IA

Built 2016 ADT: 360

IA 100 WB

Over: ELLIS RD SILVER CREEK

2.8 Mi. N of US 218/30, Linn, IA

Built 2016 ADT: 360

TOWER TERRACE WB

Over: I 380

2.4 mi. S Jct. SR E34, Linn, IA

CUMMINGS FD.RD.

Over: W OTTER CR

085082411, Linn, IA

Built 1956 Load: 13.4 t ADT: 70

DUROW RD

Over: BLUE CREEK

086083105, Linn, IA

Built 1951 Load: 15.9 t ADT: 148

LINN-BENTON RD

Over: BEAR CR

084081804, Linn, IA

Built 1948 Load: 17.1 t ADT: 196

US 30

Over: STREAM

2.5 mi. W of Jct. IA #1, Linn, IA

Built 1951 Load: 18.1 t ADT: 12,000

COVINGTON RD

Over: SILVER CREEK

083081014, Linn, IA

Built 1955 Load: 19.1 t ADT: 5,696

29TH ST DR SE

Over: INDIAN CREEK

000000000, Linn, IA

Built 1972 Load: 19.9 t ADT: 5,800

RED HAW RD

Over: BIG CR

083061404, Linn, IA

Built 1959 Load: 21.7 t ADT: 69

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