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)

NB US 65

Good

Over: DRAINAGE DITCH

4.4 MILES N OF N JCT I-80, Polk, IA

Built 1979 Load: 40.5 t ADT: 8,200

NW 128TH ST SB

Good

Over: WALNUT CREEK

079253200, Polk, IA

Built 1998 Load: 40.5 t ADT: 7,065

NW 128TH ST NB

Good

Over: WALNUT CREEK

079253200, Polk, IA

Built 2007 Load: 40.5 t ADT: 6,875

EB IA 163

Good

Over: CAMP CREEK

6.9 mi. E of Jct. US 65, Polk, IA

Built 2007 Load: 40.9 t ADT: 6,300

WB IA 163

Good

Over: CAMP CREEK

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

Built 2007 Load: 40.9 t ADT: 6,300

NE 36TH

Good

Over: OTTER CREEK

080230700, Polk, IA

Built 1982 Load: 40.9 t ADT: 6,694

FM

Good

Over: FOUR MILE CREEK

079231701, Polk, IA

Built 1991 Load: 42.1 t ADT: 1,504

COWLES DRIVE

Good

Over: GARAGE ENTRY LANE

0.3 mi. N of Entrance, Polk, IA

Built 2023 Load: 42.1 t

EB I-235

Good

Over: UP RR

1.3 MILES E OF JCT US 6, Polk, IA

Built 2006 Load: 42.9 t ADT: 25,550

NW 70TH AVENUE

Good

Over: BEAVER CREEK

000000000, Polk, IA

Built 1994 Load: 43.1 t ADT: 5,205

UNIVSITY RAMP A

Good

Over: UPRR

0.2 MILES E OF JCT IA 163, Polk, IA

Built 2001 Load: 43.1 t ADT: 2,300

VANDALIA RD

Good

Over: DRAINAGE

078231600, Polk, IA

Built 2020 Load: 43.1 t ADT: 6,300

IA 415

Good

Over: ROCK CREEK

1.9 MILES N OF JCT IA 160, Polk, IA

Built 1993 Load: 43.9 t ADT: 9,100

WB I-235

Good

Over: UP RR

1.3 MILES E OF JCT US 6, Polk, IA

Built 2006 Load: 44.1 t ADT: 25,550

FM

Good

Over: DES MOINES RIVER

NW 66th over Des Moines, Polk, IA

Built 2016 Load: 44.4 t ADT: 11,354

NE 150TH AVE

Good

Over: SKUNK RIVER

081231401, Polk, IA

Built 2012 Load: 44.4 t ADT: 142

NW 72ND PLACE

Good

Over: CREEK

080243409, Polk, IA

Built 2015 Load: 45.4 t ADT: 338

S.W.3RD ST

Good

Over: RACCOON RIVER

078240900, Polk, IA

Built 1995 Load: 46.0 t ADT: 8,948

FM

Good

Over: CAMP CREEK

078222403, Polk, IA

Built 1993 Load: 46.7 t ADT: 150

E MLK JR PKWY

Good

Over: NS RR

078240207, Polk, IA

Built 2016 Load: 46.7 t ADT: 14,883

E MLK JR PKWY

Good

Over: UP RR

078240207, Polk, IA

Built 2016 Load: 46.7 t ADT: 14,883

MLK EB

Good

Over: DES MOINES RIVER

078240800, Polk, IA

Built 2010 Load: 46.9 t ADT: 4,276

MLK WB

Good

Over: DES MOINES RIVER

078240800, Polk, IA

Built 2010 Load: 46.9 t ADT: 4,079

LOCAL ROAD

Good

Over: DEER CREEK

080231701, Polk, IA

Built 2003 Load: 47.0 t ADT: 50

LOCAL ROAD

Good

Over: BIG CREEK

081250401, Polk, IA

Built 1992 Load: 47.3 t ADT: 60

FM

Good

Over: LITTLE CREEK

081251601, Polk, IA

Built 1986 Load: 47.3 t ADT: 79

NB US 65

Good

Over: OVER 4 MI. CK & IAIS RR

2.9 MILES S OF JCT I-80, Polk, IA

Built 1994 Load: 48.3 t ADT: 14,300

NB US 65

Good

Over: DES MOINES RIVER

2.6 MI. S OF JCT. IA 163, Polk, IA

Built 1997 Load: 48.3 t ADT: 12,450

LOCAL

Good

Over: MUD CREEK

078220404, Polk, IA

Built 1990 Load: 49.2 t ADT: 71

FM

Good

Over: CAMP CREEK

078221103, Polk, IA

Built 1985 Load: 49.2 t ADT: 110

FM

Good

Over: BIG CREEK

081250901, Polk, IA

Built 1990 Load: 49.2 t ADT: 150

SE 6TH AVE

Good

Over: TRIB TO MUD CREEK

078221001, Polk, IA

Built 2000 Load: 49.3 t ADT: 159

NB I-35,EB I-80

Good

Over: UP RR

0.5 mi. E of jct. US 69, Polk, IA

Built 2000 Load: 49.4 t ADT: 41,550

UNIVERSITY AVE

Good

Over: NORTH WALNUT CREEK

078250300, Polk, IA

Built 1983 Load: 49.5 t ADT: 11,490

OLD IA 950 FM

Good

Over: E FOURMILE CK

079233510, Polk, IA

Built 1987 Load: 50.0 t ADT: 8,366

32ND ST SE

Good

Over: MUD CREEK

079220700, Polk, IA

Built 2005 Load: 50.2 t ADT: 530

SB US 65

Good

Over: DES MONES RIVER

2.6 MI. S OF JCT. IA 163, Polk, IA

Built 1997 Load: 50.4 t ADT: 12,300

I 35

Good

Over: TRIB TO FOUR MILE CREEK

0.8 MI. N OF E 1ST ST, Polk, IA

Built 2018 Load: 54.4 t ADT: 56,800

US 6 EB

Good

Over: WALNUT CREEK/BIKE PATH

1.0 MI. W OF JCT. I-35/80, Polk, IA

Built 1998 Load: 67.1 t ADT: 15,350

US 6 WB

Good

Over: WALNUT CREEK/BIKE PATH

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

Built 1998 Load: 67.1 t ADT: 15,350

LOCAL ROAD

Poor

Over: FOUR MILE CREEK

080233005, Polk, IA

Built 1941 ADT: 89

FM

Poor

Over: BRANCH, SKUNK RIVER

081231301, Polk, IA

Built 1968 Load: 8.1 t ADT: 139

LOCAL

Poor

Over: LITTLE BEAVER CREEK

080253504, Polk, IA

Built 1926 Load: 9.8 t ADT: 199

FM

Poor

Over: DEER CREEK

080231812, Polk, IA

Built 1950 Load: 10.1 t ADT: 2,421

FM

Poor

Over: CREEK

080222605, Polk, IA

Built 1951 Load: 13.3 t ADT: 229

PRIVATE (SDB)

Poor

Over: STREAM (SDB)

079222604, Polk, IA

Built 1950 Load: 14.0 t ADT: 10

LOCAL ROAD

Poor

Over: CAMP CREEK

078221403, Polk, IA

Built 1914 Load: 14.1 t ADT: 26

LOCAL ROAD

Poor

Over: SKUNK RIVER

081231001, Polk, IA

Built 1928 Load: 14.2 t ADT: 29

FM

Poor

Over: BRANCH, SKUNK RIVER

081231303, Polk, IA

Built 1968 Load: 14.8 t ADT: 131

LOCAL

Poor

Over: OVER UPRR

079230508, Polk, IA

Built 1948 Load: 16.3 t ADT: 399

Read our methodology — how this data is sourced, computed, and verified.

Related

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial