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:

SB US 65

Over: EAST OAKWOOD DRIVE

0.4 MILES S OF JCT IA 163, Polk, IA

Built 1997 ADT: 1,010

S 35TH STREET

Over: IA 5

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

Built 2002 ADT: 30,100

IA 5 NB

Over: IA 28

At Jct. IA 28, Polk, IA

Built 2000 ADT: 8,750

IA 5 SB

Over: IA 28

At Jct. IA 28, Polk, IA

Built 2000 ADT: 7,300

I-80 EB ON RAMP

Over: NE 3RD ST

0.2 MILE E OF JCT IA 415, Polk, IA

Built 2000 ADT: 2,540

MAFFITT LAKE RD

Over: I-35

0.2 mi. S of Jct. IA 5, Polk, IA

Built 2000 ADT: 26,200

I 80 WB OFF RAMP

Over: NE 3RD ST

0.2 MILE E OF JCT IA 415, Polk, IA

Built 2000 ADT: 2,540

IA5 W TO I35 S

Over: I-35 & IA #5 RAMP C

Jct. of IA 5, Polk, IA

Built 2000 ADT: 24,400

IA 5 - RAMP C

Over: I-35

At Jct. I-35, Polk, IA

Built 2002 ADT: 24,400

SW CONNECTOR

Over: IA 5

2.3 MILES N OF JCT IA 28, Polk, IA

Built 2002 ADT: 29,600

M LUTHER KING

Over: I-235

3.2 MILES E OF JCT IA 28, Polk, IA

Built 2003 ADT: 98,500

I-235 WB

Over: EASTON BLVD

0.4 mi. E of Jct. IA #163, Polk, IA

Built 2006 ADT: 1,680

S 42ND STREET

Over: IA 5

0.6 MILE S OF JUNCT I-35, Polk, IA

Built 2002 ADT: 32,500

22ND STREET

Over: IA 5

3.1 MILES N OF JCT IA 28, Polk, IA

Built 2002 ADT: 30,600

IA 5 SB

Over: 8TH STREET

1.6 MILES NW JUNCT IA 28, Polk, IA

Built 2002 ADT: 51

IA 5 NB

Over: 8TH STREET

1.6 MILES NW JCT IA 28, Polk, IA

Built 2002 ADT: 51

E 6TH ST

Over: I-235

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

Built 2002 ADT: 80,600

WB I-235

Over: EAST 21ST STREET

0.9 MILE E OF JCT US 69, Polk, IA

Built 2001 ADT: 3,300

5TH AVE

Over: I-235

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

Built 2003 ADT: 83,600

I 235 EB OFF RAMP

Over: EAST 21ST STREET

0.3 mi. E of Jct. IA 163, Polk, IA

Built 2006 ADT: 6,600

E 15TH RAMP D

Over: E UNIVERSITY RAMP B

0.3 MILE E OF JCT US 69, Polk, IA

Built 2004 ADT: 7,400

WB I-235

Over: IA 163/UNIV AVE/RAMP

0.6 MI E OF JCT US 69 NB, Polk, IA

Built 2004 ADT: 4,850

CORP WOODS DR

Over: I-35

1.9 mi. N of E Jct. I-80, Polk, IA

Built 2003 ADT: 73,200

UNI AVE WB ENTR

Over: WB EXIT RAMP, UNIV. AVE.

0.5 mi. E of Jct. U.S. 69, Polk, IA

Built 2004 ADT: 9,700

I 235 EB

Over: EASTON BLVD

0.4 mi. E of Jct. IA #163, Polk, IA

Built 2004 ADT: 1,680

EB I-235 RAMP

Over: KEO WAY RAMP TO EB I-235

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

Built 2005 ADT: 11,400

I 235 WB

Over: NB I-35 & EB I-80

At East Jct. I80/I35, Polk, IA

Built 2007 ADT: 26,800

WB I-235

Over: WB I-235 & WB I-80

AT EAST JUNCTION I-35/80, Polk, IA

Built 2007 ADT: 28,500

EB I-235

Over: NB I-35 & EB I-80

AT EAST JUNCTION I-35/80, Polk, IA

Built 2007 ADT: 31,900

I 235 EB

Over: WB I-235 & WB I-80

AT EAST JUNCTION I-35/80, Polk, IA

Built 2007 ADT: 28,500

EBI235 TO WBI80

Over: EB I-80

At East Mixmaster, Polk, IA

Built 2008 ADT: 57,000

EBI80 TO NBI35

Over: WB I-80

At the N Jct. I-80/I-235, Polk, IA

Built 2009 ADT: 57,000

EBI235 TO WBI80

Over: WB I-80

East Mixmaster in DM, Polk, IA

Built 2009 ADT: 28,500

SBI35 TO EBI80

Over: WB I-80

At East Mixmaster, Polk, IA

Built 2009 ADT: 53,600

SBI35 TO EBI80

Over: NB I-35 & EB I-80

At East Mixmaster, Polk, IA

Built 2009 ADT: 53,600

WBI80 TO WBI235

Over: NB I-35 & EB I-80

At NE Mix Master in D.M., Polk, IA

Built 2009 ADT: 53,600

IA 141 FLY OVER

Over: I 35/80, IA 141 & RR

AT JCT. IA 141 & I-35/80, Polk, IA

Built 2019 ADT: 69,800

NW 100TH ST SB

Over: I 35 & I 80

1.0 MI. E OF JCT. 141, Polk, IA

Built 2016 ADT: 41,000

FM

Over: FOUR MILE CREEK

081242201, Polk, IA

Built 1965 Load: 13.5 t ADT: 912

LOCAL RD

Over: DEER CREEK

080230903, Polk, IA

Built 1976 Load: 13.6 t ADT: 60

LOCAL ROAD

Over: BR. WHITE OAK CK

081230901, Polk, IA

Built 1946 Load: 13.6 t ADT: 45

FM

Over: BR BIG CREEK

081251402, Polk, IA

Built 1931 Load: 13.6 t ADT: 259

JESTER PARK

Over: PAW CREEK

081253303, Polk, IA

Built 1963 Load: 14.4 t ADT: 29

US 69

Over: FOURMILE CREEK

0.2 MI. S OF SR F22, Polk, IA

Built 1922 Load: 15.2 t ADT: 6,800

FM

Over: DRAINAGE DITCH

080220301, Polk, IA

Built 1959 Load: 15.2 t ADT: 45

NW 146 AVE

Over: TURKEY CREEK

0.2 MI. E OF OLD IA 415, Polk, IA

Built 1937 Load: 15.3 t ADT: 71

LOCAL ROAD

Over: DRAINAGE DITCH

081221905, Polk, IA

Built 1967 Load: 15.6 t ADT: 40

US 69

Over: FOURMILE CREEK

1.3 miles N of IA 160, Polk, IA

Built 1949 Load: 16.1 t ADT: 6,800

LOCAL ROAD

Over: DITCH

081222902, Polk, IA

Built 1969 Load: 18.0 t ADT: 60

US 6

Over: DRAINAGE DITCH

0.9 MILE W OF W JCT IA 28, Polk, IA

Built 1937 Load: 18.1 t ADT: 20,100

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