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)

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.

Related

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