Polk County, IA

415 public highway bridges

Polk County Bridge Snapshot

Polk County, Iowa contains 415 public highway bridges in the FHWA National Bridge Inventory. Roughly 35.4% are rated “Good,” 25.3% “Fair,” 6% “Poor,” and 6% 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.

415

Total Bridges

35.4%

Good

6%

Poor

6%

Structurally Deficient

Condition Distribution

Good

35.4% (147)

Fair

25.3% (105)

Poor

6% (25)

SD

6% (25)

All Bridges (415)

Sort:

I 35 NB

Over: GRAND AVE

At jct. of Grand Ave., Polk, IA

Built 2014 ADT: 1,620

I 35 NB

Over: RR, EP TRUE, CREEK

1.2 MI. S OF S JCT. I-80, Polk, IA

Built 2014 ADT: 6,800

I 35 SB I 80 WB

Over: US 6

AT JCT. US 6, Polk, IA

Built 1958 ADT: 15,750

DOUGLAS AVE

Over: I 35 & I 80

At JUNCTION I-80 & I-35, Polk, IA

Built 2002 ADT: 89,500

SB I35 WB I80

Over: NS RR & IA 141

AT JCT. IOWA 141, Polk, IA

Built 1958 ADT: 15,300

86TH ST

Over: I-35 & I-80

2.0 MI. W OF IOWA 28, Polk, IA

Built 1994 ADT: 1,660

I-80 EB & I-35 NB

Over: NW 72ND ST

1.0 MILE W OF JCT. IA 28, Polk, IA

Built 1958 ADT: 2,290

NB I-35/EB I-80

Over: IA 28

At jct. IA 28, Polk, IA

Built 1999 ADT: 1,600

SB I-35,WB I-80

Over: IA 28

At the Jct. IA 28, Polk, IA

Built 1999 ADT: 1,600

NW 26TH ST

Over: I 35 & I 80

1.7 MI. WEST OF IA 415, Polk, IA

Built 2017 ADT: 101,500

SB I-35,WB I-80

Over: 6TH AVE

0.4 mi. W of Jct. IA 415, Polk, IA

Built 1958 ADT: 2,025

NB I 35 EB I 80

Over: IA 415

At Jct. of IA 415, Polk, IA

Built 1999 ADT: 16,400

I 80 WB I 35 SB

Over: IA 415

At Jct. of IA 415, Polk, IA

Built 1999 ADT: 16,400

NB I-35,EB I-80

Over: NE 3RD ST

0.3 mi. E of Jct. IA 415, Polk, IA

Built 2000 ADT: 1,270

I 35 NB I 80 EB

Over: US 69

AT JUNCTION WITH US 69, Polk, IA

Built 2000 ADT: 9,550

NE 22ND ST

Over: I 80 & I 35

0.3 mi. W of E jct. I-235, Polk, IA

Built 2017 ADT: 83,600

NE 54TH AVE

Over: I 35

0.5 MI. N OF I-80 JCT, Polk, IA

Built 2017 ADT: 86,200

IA 160

Over: I-35

AT JUNCTION INTERSTATE 35, Polk, IA

Built 1986 ADT: 55,600

I 35 NB

Over: E 1ST STREET

2.0 MILES N OF JCT IA 160, Polk, IA

Built 2019 ADT: 2,205

I 35 SB

Over: E 1ST STREET

2.0 mi. N of jct. IA 160, Polk, IA

Built 2020 ADT: 2,205

WB I-235

Over: I-35

AT WEST JUNCTION I-35-80, Polk, IA

Built 1966 ADT: 31,800

EB I-80

Over: NE 29TH ST

0.7 mi. E of E Jct. I-35, Polk, IA

Built 1959 ADT: 1,165

WB I-80

Over: NE 29TH ST

0.7 mi. E of E Jct. I-35, Polk, IA

Built 1959 ADT: 1,165

34TH AVE NW

Over: I-80 & US-65

0.4 MILES W OF JCT US 65, Polk, IA

Built 2013 ADT: 50,700

NE 72ND ST

Over: I-80 & US 6

1.6 mi. E of Jct. U.S. 65, Polk, IA

Built 2006 ADT: 36,100

FM NE 80TH ST

Over: I-80

2.8 MILES E OF JCT. US 65, Polk, IA

Built 1959 ADT: 39,000

NE 96TH ST

Over: I-80

1.9 MILES WEST OF SR S27, Polk, IA

Built 1959 ADT: 39,000

FM S-27

Over: I-80

At Jct. Polk Co. S27, Polk, IA

Built 1959 ADT: 36,100

I 80 EB

Over: I-35

AT W JCT. I-35, Polk, IA

Built 1966 ADT: 3,190

I 80 EB

Over: I 235

0.2 MILE E OF W JCT I-80, Polk, IA

Built 1966 ADT: 57,900

VALLEY WEST DR

Over: I 235

1.3 MI E OF W JCT 80/35, Polk, IA

Built 2003 ADT: 87,000

EB I-235

Over: 22ND ST

2.1 MI E OF W JCT I-35/80, Polk, IA

Built 1968 ADT: 3,500

EB I-235

Over: 17TH ST

1.3 mi. W of Jct. IA 28, Polk, IA

Built 1967 ADT: 900

WB I-235

Over: 17TH ST

1.3 mi. W of Jct. IA 28, Polk, IA

Built 1967 ADT: 900

EB I-235

Over: 73RD ST & RR

3.2 MI E OF W JCT I 80/35, Polk, IA

Built 1968 ADT: 9,050

IA 28

Over: I-235

At Jct. I-235, Polk, IA

Built 2004 ADT: 104,800

EB I-235

Over: CUMMINS PARKWAY

0.2 MILE E OF JCT IA 28, Polk, IA

Built 1967 ADT: 280

NB(WB) POLK BLV

Over: I-235

1.2 MILES E OF JCT IA 28, Polk, IA

Built 2003 ADT: 63,400

42ND ST SW

Over: I-235

1.5 MI EAST OF JCT IA 28, Polk, IA

Built 2003 ADT: 114,500

EB I-235

Over: 35TH STREET

2.0 MILES E OF JCT IA 28, Polk, IA

Built 2004 ADT: 2,190

WB I-235

Over: 35TH STREET

2.1 mi. E of Jct. IA #28, Polk, IA

Built 2005 ADT: 2,190

31ST STREET

Over: I-235

2.3 mi. E of Jct. IA #28, Polk, IA

Built 2005 ADT: 113,700

WB I-235

Over: 28TH STREET

2.6 mi. E of Jct. IA 28, Polk, IA

Built 2005 ADT: 895

W 19TH ST

Over: I-235

3.3 MILES E OF JCT IA 28, Polk, IA

Built 2003 ADT: 91,500

EB I-235

Over: KEO WAY

3.6 mi. E of Jct. IA 28, Polk, IA

Built 2006 ADT: 4,900

WB I-235

Over: KEO WAY

3.6 MILES E OF JCT. IA 28, Polk, IA

Built 2005 ADT: 4,900

9TH STREET

Over: I-235

3.9 mi. E of Jct. IA 28, Polk, IA

Built 2007 ADT: 78,900

6TH AVE

Over: I-235

1.4 miles west of US 69, Polk, IA

Built 2004 ADT: 90,300

3RD ST

Over: I-235

4.3 mi. E of Jct. IA #28, Polk, IA

Built 2003 ADT: 83,600

2ND AVE ON RAMP

Over: S-W CONN OVER WB I-235

4.4 MILES E OF JCT IA 28, Polk, IA

Built 2002 ADT: 89,000

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