Plymouth County, IA

407 public highway bridges

Plymouth County Bridge Snapshot

Plymouth County, Iowa contains 407 public highway bridges in the FHWA National Bridge Inventory. Roughly 51.8% are rated “Good,” 24.6% “Fair,” 22.1% “Poor,” and 22.1% 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.

407
Total Bridges
51.8%
Good
22.1%
Poor
22.1%
Structurally Deficient

Condition Distribution

Good
51.8% (211)
Fair
24.6% (100)
Poor
22.1% (90)
SD
22.1% (90)

All Bridges (407)

IA 3

Fair

Over: BROKEN KETTLE CREEK

2.3 mi. W of SR K22, Plymouth, IA

Built 1975 Load: 36.9 t ADT: 940

IA 140

Fair

Over: CLEAR CREEK

2.8 mi. S of IA 3, Plymouth, IA

Built 1964 Load: 37.0 t ADT: 1,130

IA 3

Fair

Over: STREAM

1.0 mi. W of S.R. K42, Plymouth, IA

Built 1954 Load: 37.6 t ADT: 1,420

FM

Fair

Over: SMALL

090482308, Plymouth, IA

Built 1900 Load: 41.8 t ADT: 628

FM

Fair

Over: PERRY CREEK

091471402, Plymouth, IA

Built 1949 Load: 44.1 t ADT: 1,028

BIG SIOUX RIVER RD

Fair

Over: BIG SIOUX RIVER

0.5 MI. N OF JCT. IA 12, Plymouth, IA

Built 1996 Load: 50.9 t ADT: 1,121

ROOSEVELT AVE

Good

Over: CREEK

090432802, Plymouth, IA

Built 1956 Load: 11.1 t ADT: 20

KEY AVE

Good

Over: BIG WHISKEY CREEK

090453102, Plymouth, IA

Built 1952 Load: 11.7 t ADT: 26

270TH ST

Good

Over: BIG WHISKEY SLOUGH

091433601, Plymouth, IA

Built 1990 Load: 16.9 t ADT: 11

190TH ST

Good

Over: WESTFIELD CREEK

092482001, Plymouth, IA

Built 1990 Load: 18.5 t ADT: 20

EVERGREEN AVE

Good

Over: INDIAN CREEK

093470704, Plymouth, IA

Built 1996 Load: 21.0 t ADT: 5

ACCESS ROAD

Good

Over: STREAM

0.1 mi. S of S.R. C80, Plymouth, IA

Built 2000 Load: 21.1 t ADT: 1,347

FM

Good

Over: PLYMOUTH CREEK

092441602, Plymouth, IA

Built 1975 Load: 21.3 t ADT: 789

190TH ST

Good

Over: DRAINAGE

092432401, Plymouth, IA

Built 1975 Load: 21.4 t ADT: 11

IA 3 & 12

Good

Over: DRAINAGE DITCH

At E jct of Iowa 12, Plymouth, IA

Built 1976 Load: 21.7 t ADT: 2,340

JUNIPER AVE

Good

Over: DRAINAGE

091461404, Plymouth, IA

Built 1990 Load: 21.7 t ADT: 5

IA 60

Good

Over: WOLF CREEK

1.5 mi. N of jct. US 75, Plymouth, IA

Built 2004 Load: 22.4 t ADT: 6,200

IA 3

Good

Over: STREAM

0.9 mi. W of Jct. SR L12, Plymouth, IA

Built 1994 Load: 23.3 t ADT: 3,820

IA 3

Good

Over: WESTFIELD CREEK

2.0 mi E of E Jct IA 12, Plymouth, IA

Built 1975 Load: 23.5 t ADT: 940

IA 3

Good

Over: STREAM

2.0 mi. E of SR K18, Plymouth, IA

Built 1975 Load: 24.5 t ADT: 940

IA 140

Good

Over: DRAINAGE

0.5 mi. N of SR C60, Plymouth, IA

Built 2008 Load: 24.9 t ADT: 970

FM C-60

Good

Over: FLOYD RIVER

090460905, Plymouth, IA

Built 1985 Load: 25.1 t ADT: 1,586

220TH ST

Good

Over: DD

091430301, Plymouth, IA

Built 1900 Load: 25.8 t ADT: 30

SHAMROCK AVE

Good

Over: CREEK

092433402, Plymouth, IA

Built 2000 Load: 26.1 t ADT: 45

100TH ST

Good

Over: DEEP CREEK

093430201, Plymouth, IA

Built 2006 Load: 26.3 t ADT: 11

IA 60

Good

Over: DRAINAGE DITCH

0.4 mi. S of jct. SR C16, Plymouth, IA

Built 2003 Load: 26.6 t ADT: 6,900

IA 3

Good

Over: BIG WHISKEY SLOUGH

0.6 mi W of jct SR L22, Plymouth, IA

Built 1999 Load: 26.7 t ADT: 2,140

200TH ST

Good

Over: CLEAR CREEK

9244251104000, Plymouth, IA

Built 2023 Load: 26.9 t ADT: 45

4TH AVE.E

Good

Over: WILLOW CREEK

000000000, Plymouth, IA

Built 1993 Load: 27.2 t ADT: 851

FM K-42

Good

Over: MINK CREEK

092461502, Plymouth, IA

Built 1985 Load: 27.3 t ADT: 359

120TH ST

Good

Over: MINK CREEK

093461701, Plymouth, IA

Built 1999 Load: 28.2 t ADT: 50

195TH STREET

Good

Over: FLOYD RIVER

092451907, Plymouth, IA

Built 1975 Load: 28.8 t ADT: 60

FAWN AVE

Good

Over: INDIAN CREEK

093471702, Plymouth, IA

Built 1900 Load: 28.8 t ADT: 34

FM C-44

Good

Over: JOHN'S CREEK

091442401, Plymouth, IA

Built 1985 Load: 29.0 t ADT: 150

FM

Good

Over: DEEP CREEK

093433202, Plymouth, IA

Built 1981 Load: 29.0 t ADT: 868

FM C-44

Good

Over: DRY BRANCH

091442101, Plymouth, IA

Built 1998 Load: 29.7 t ADT: 150

FM C-70

Good

Over: BIG WHISKEY CREEK

090453101, Plymouth, IA

Built 1985 Load: 29.8 t ADT: 559

FM C-60

Good

Over: PERRY CREEK

090471101, Plymouth, IA

Built 1984 Load: 29.8 t ADT: 908

FM

Good

Over: INDIAN CREEK

093470801, Plymouth, IA

Built 1984 Load: 29.8 t ADT: 319

FM

Good

Over: DRAINAGE

090432904, Plymouth, IA

Built 1972 Load: 30.0 t ADT: 748

FM C-44

Good

Over: MINNIE BROOK

091450901, Plymouth, IA

Built 1977 Load: 30.0 t ADT: 339

FM

Good

Over: SMALL

093473502, Plymouth, IA

Built 1978 Load: 30.0 t ADT: 878

LAKE AVE

Good

Over: PLYMOUTH CREEK

091450502, Plymouth, IA

Built 1977 Load: 30.2 t ADT: 159

FM C-38

Good

Over: PLYMOUTH CREEK

092453501, Plymouth, IA

Built 1977 Load: 30.2 t ADT: 1,267

FM

Good

Over: SMALL

093461201, Plymouth, IA

Built 1978 Load: 30.4 t ADT: 450

FM K-13

Good

Over: WESTFIELD CREEK

092482902, Plymouth, IA

Built 1988 Load: 30.5 t ADT: 180

FM

Good

Over: W BRANCH FLOYD RIVER

093450803, Plymouth, IA

Built 1976 Load: 30.5 t ADT: 658

FM C-60

Good

Over: KETTLE CREEK

090461101, Plymouth, IA

Built 1969 Load: 30.6 t ADT: 628

FM

Good

Over: BROKEN KETTLE CREEK

090480305, Plymouth, IA

Built 1976 Load: 30.6 t ADT: 489

270TH ST

Good

Over: PERRY CREEK

091473501, Plymouth, IA

Built 1986 Load: 30.6 t ADT: 80

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