Plymouth County, IA

407 public highway bridges

Plymouth County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Plymouth County, Iowa contains 407 public highway bridges. Roughly 51.8% are rated “Good,” 24.6% “Fair,” and 22.1% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

407
Total Bridges
51.8%
Good
24.6%
Fair
22.1%
Poor Condition

Condition Distribution

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

All Bridges (407)

MARBLE AVE

Good

Over: WILLOW CREEK

092451104, Plymouth, IA

Built 1994 Load: 36.9 t ADT: 538

330TH ST

Good

Over: CREEK

090433501, Plymouth, IA

Built 2002 Load: 37.2 t ADT: 26

FM

Good

Over: FLOYD RIVER

092453105, Plymouth, IA

Built 2007 Load: 37.2 t ADT: 1,566

QUARRY ROAD

Good

Over: W FORK LITTLE SIOUX

9044263104095, Plymouth, IA

Built 2022 Load: 37.3 t ADT: 26

IMPERIAL RD

Good

Over: CREEK

090462904, Plymouth, IA

Built 1977 Load: 37.5 t ADT: 379

IA 140

Good

Over: STREAM

0.1 mi. S of S Jct SR C66, Plymouth, IA

Built 1976 Load: 37.6 t ADT: 1,990

HEDGE AVE

Good

Over: BROKEN KETTLE CREEK

93473602, Plymouth, IA

Built 2014 Load: 37.6 t ADT: 11

240TH ST

Good

Over: CLEAR CREEK

9144141107500, Plymouth, IA

Built 2023 Load: 37.9 t ADT: 26

130TH ST

Good

Over: WOLF CREEK

9345210110, Plymouth, IA

Built 2010 Load: 37.9 t ADT: 45

FM C-70

Good

Over: FLOYD RIVER

090463007, Plymouth, IA

Built 1990 Load: 38.0 t ADT: 1,487

IRIS AVE

Good

Over: CREEK

9146280210, Plymouth, IA

Built 2010 Load: 38.0 t ADT: 11

IA 60 SB

Good

Over: STREAM

0.7 mi S of SR C12, Plymouth, IA

Built 2004 Load: 38.2 t ADT: 3,200

FM

Good

Over: JOHN'S CREEK

090442409, Plymouth, IA

Built 1977 Load: 38.5 t ADT: 309

OTTER AVE

Good

Over: PLYMOUTH CREEK

924417210, Plymouth, IA

Built 2016 Load: 38.6 t ADT: 26

280TH ST

Good

Over: BIG WHISKEY CREEK

9045040110, Plymouth, IA

Built 2010 Load: 38.9 t ADT: 34

270TH ST

Good

Over: BIG WHISKEY CREEK

9145330110, Plymouth, IA

Built 2016 Load: 38.9 t ADT: 26

FM C-70

Good

Over: ELLIOT CREEK

090453501, Plymouth, IA

Built 1999 Load: 39.1 t ADT: 450

320TH ST

Good

Over: MUDDY CREEK

9045280110, Plymouth, IA

Built 2017 Load: 39.6 t ADT: 11

FM

Good

Over: BROKEN KETTLE CREEK

9347330110, Plymouth, IA

Built 2010 Load: 39.6 t ADT: 199

190TH ST

Good

Over: BROKEN KETTLE CREEK

9247190110, Plymouth, IA

Built 2018 Load: 39.9 t ADT: 30

FM

Good

Over: MUD CREEK

090451203, Plymouth, IA

Built 2008 Load: 40.0 t ADT: 409

220TH ST

Good

Over: JOHN'S CREEK

091440101, Plymouth, IA

Built 2008 Load: 40.0 t ADT: 30

FM

Good

Over: SMALL STREAM

091471101, Plymouth, IA

Built 1987 Load: 40.0 t ADT: 259

160TH ST

Good

Over: BIG WHISKEY SLOUGH

9243020110, Plymouth, IA

Built 2015 Load: 40.0 t ADT: 34

IRIS AVE

Good

Over: MINK CREEK

000000000, Plymouth, IA

Built 2009 Load: 40.0 t ADT: 30

310TH ST

Good

Over: MUDDY CREEK

9045240110, Plymouth, IA

Built 2017 Load: 40.2 t ADT: 26

IA 3

Good

Over: DRAINAGE DITCH

1.6 mi. W of jct. SR K42, Plymouth, IA

Built 2020 Load: 40.5 t ADT: 1,420

OTTER AVE

Good

Over: DEEP CREEK

092440502, Plymouth, IA

Built 2007 Load: 40.5 t ADT: 100

150TH ST

Good

Over: WHISKEY CREEK

9343350110, Plymouth, IA

Built 2011 Load: 40.8 t ADT: 34

IDEAL ROAD

Good

Over: UNNAMED WATERWAY

9146150310, Plymouth, IA

Built 2021 Load: 41.1 t ADT: 26

FM

Good

Over: SMALL

093461101, Plymouth, IA

Built 2006 Load: 41.1 t ADT: 450

NATURE AVE

Good

Over: WILLOW CREEK

9345360220, Plymouth, IA

Built 2018 Load: 41.5 t ADT: 30

DIAMOND AVE

Good

Over: INDIAN CREEK

9348102100016, Plymouth, IA

Built 2023 Load: 41.5 t ADT: 45

C 38

Good

Over: MINK CREEK

92-46-35-01-10, Plymouth, IA

Built 2012 Load: 41.8 t ADT: 1,347

120TH ST

Good

Over: INDIAN CREEK

93471701104200, Plymouth, IA

Built 2021 Load: 41.8 t ADT: 5

300TH ST

Good

Over: BIG WHISKEY CREEK

090451803, Plymouth, IA

Built 2008 Load: 42.3 t ADT: 40

310TH ST

Good

Over: BIG WHISKEY CREEK

090451903, Plymouth, IA

Built 2008 Load: 42.3 t ADT: 20

FAWN AVE

Good

Over: BROKEN KETTLE CREEK

9247170210, Plymouth, IA

Built 2013 Load: 42.3 t ADT: 30

120TH ST

Good

Over: DEEP CREEK

93431550, Plymouth, IA

Built 2014 Load: 42.3 t ADT: 45

C12 110TH ST

Good

Over: WILLOW CREEK

934411011090, Plymouth, IA

Built 2014 Load: 42.3 t ADT: 30

FM

Good

Over: FLOYD RIVER

9345240310, Plymouth, IA

Built 2010 Load: 42.8 t ADT: 249

230TH ST

Good

Over: BIG WHISKEY SLOUGH

9143110110, Plymouth, IA

Built 2017 Load: 42.9 t ADT: 15

FM K-42

Good

Over: DRAINAGE

091460202, Plymouth, IA

Built 2008 Load: 43.0 t ADT: 748

TAMARACK AVE

Good

Over: WHISKEY CREEK

000000000, Plymouth, IA

Built 2009 Load: 43.3 t ADT: 26

FAWN AVE

Good

Over: BULL RUN

9247290110, Plymouth, IA

Built 2015 Load: 43.3 t ADT: 26

EVERGREEN AVE

Good

Over: BULL RUN

9247300210, Plymouth, IA

Built 2014 Load: 43.3 t ADT: 15

FM

Good

Over: BIG WHISKEY SLOUGH

093432401, Plymouth, IA

Built 2008 Load: 43.3 t ADT: 450

150TH ST

Good

Over: WILLOW CREEK

9344310210, Plymouth, IA

Built 2011 Load: 43.3 t ADT: 15

NATURE AVE

Good

Over: DEEP CREEK

9345360210, Plymouth, IA

Built 2018 Load: 43.7 t ADT: 30

FM C-70

Good

Over: DRAINAGE DITCH

090453101, Plymouth, IA

Built 1995 Load: 44.1 t ADT: 559

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

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.