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)

LOCAL

Good

Over: CREEK

090433004, Plymouth, IA

Built 1984 Load: 30.8 t ADT: 589

FM C-60

Good

Over: MINNIE BROOK

090450703, Plymouth, IA

Built 1979 Load: 30.8 t ADT: 628

LYNX AVENUE

Good

Over: SMALL STREAM

092453302, Plymouth, IA

Built 1987 Load: 30.8 t ADT: 50

FM

Good

Over: DRAINAGE DITCH

092483602, Plymouth, IA

Built 1994 Load: 31.2 t ADT: 390

FM

Good

Over: MUDDY CREEK

090453303, Plymouth, IA

Built 1985 Load: 31.8 t ADT: 559

FM

Good

Over: RATHBUN CREEK

091431901, Plymouth, IA

Built 1986 Load: 31.8 t ADT: 150

HEDGE AVE

Good

Over: SMALL CREEK

9347250210, Plymouth, IA

Built 2020 Load: 31.8 t ADT: 15

200TH ST

Good

Over: SMALL STREAM

092492501, Plymouth, IA

Built 1986 Load: 31.9 t ADT: 40

US 75 SB

Good

Over: STREAM

0.6 mi. S of SR C60, Plymouth, IA

Built 2020 Load: 32.4 t ADT: 7,500

IA 3

Good

Over: W FORK OF FLOYD RIVER

0.7 mi. W of US 75, Plymouth, IA

Built 2004 Load: 32.4 t ADT: 2,070

IA 12

Good

Over: INDIAN CREEK

4.0 mi N of SR C16, Plymouth, IA

Built 2021 Load: 32.4 t ADT: 1,120

160TH ST

Good

Over: FLOYD RIVER

9245040110, Plymouth, IA

Built 2013 Load: 32.4 t ADT: 131

C-38

Good

Over: W BR FLOYD RIVER

9246350120, Plymouth, IA

Built 2012 Load: 32.4 t ADT: 1,347

US 75

Good

Over: DRY CREEK

2.0 mi S of SR C44, Plymouth, IA

Built 1972 Load: 32.7 t ADT: 14,000

FM K-49

Good

Over: DRAINAGE

091451002, Plymouth, IA

Built 1975 Load: 32.7 t ADT: 1,017

170TH ST (SDB)

Good

Over: DRAINAGE

1.0 mi N of jct IA 3, Plymouth, IA

Built 2004 Load: 32.7 t ADT: 469

190TH ST

Good

Over: DRAINAGE

9246220210, Plymouth, IA

Built 1935 Load: 32.7 t ADT: 359

JUNIPER AVE

Good

Over: DRAINAGE

092462304, Plymouth, IA

Built 2000 Load: 32.7 t ADT: 34

QUEST AVE

Good

Over: WILLOW CREEK

093430702, Plymouth, IA

Built 2004 Load: 32.7 t ADT: 30

L-22

Good

Over: W FORK LITTLE SIOUX RIV

093432502, Plymouth, IA

Built 1974 Load: 32.7 t ADT: 210

SHAMROCK AVE

Good

Over: DRAINAGE

093432702, Plymouth, IA

Built 1991 Load: 32.7 t ADT: 20

POLK AVE

Good

Over: WILLOW CREEK

093441102, Plymouth, IA

Built 2006 Load: 32.7 t ADT: 11

LOCAL

Good

Over: DRAINAGE

093441501, Plymouth, IA

Built 2005 Load: 32.7 t ADT: 5

POLK AVE

Good

Over: DRAINAGE

093443502, Plymouth, IA

Built 2005 Load: 32.7 t ADT: 11

KEY AVE

Good

Over: WEST BRANCH FLOYD RIVER

093450702, Plymouth, IA

Built 2008 Load: 32.7 t ADT: 34

MAHOGANY AVE

Good

Over: WOLF CREEK

093451502, Plymouth, IA

Built 2006 Load: 32.7 t ADT: 15

120TH ST

Good

Over: MINK CREEK

093461503, Plymouth, IA

Built 2003 Load: 32.7 t ADT: 26

FM

Good

Over: DRAINAGE

093481003, Plymouth, IA

Built 1964 Load: 32.7 t ADT: 240

KEY AVE

Good

Over: DRAINAGE

9345310210, Plymouth, IA

Built 2018 Load: 33.4 t ADT: 40

FM

Good

Over: DITCH

090431101, Plymouth, IA

Built 1991 Load: 33.5 t ADT: 290

200TH ST

Good

Over: DRAINAGE

092462603, Plymouth, IA

Built 2006 Load: 33.6 t ADT: 71

DIAMOND AVE

Good

Over: BROKEN KETTLE CREEK

090480304, Plymouth, IA

Built 2003 Load: 33.6 t ADT: 26

190TH ST

Good

Over: CLEAR CREEK

9243200110, Plymouth, IA

Built 2018 Load: 33.7 t ADT: 60

FM K-64

Good

Over: DEEP CREEK

092440406, Plymouth, IA

Built 1982 Load: 33.7 t ADT: 938

BLUEBIRD AVE

Good

Over: LOCAL

092483002, Plymouth, IA

Built 1986 Load: 33.9 t ADT: 34

HEDGE AVE

Good

Over: PERRY CREEK

9147250210, Plymouth, IA

Built 2014 Load: 34.0 t ADT: 30

NATURE AVE

Good

Over: BIG WHISKEY CREEK

091451302, Plymouth, IA

Built 1995 Load: 34.1 t ADT: 11

C38

Good

Over: PERRY CREEK

9247360110, Plymouth, IA

Built 2017 Load: 34.3 t ADT: 948

180TH ST

Good

Over: BULL RUN

092471501, Plymouth, IA

Built 1985 Load: 34.8 t ADT: 15

CONCORD AVE

Good

Over: DRAINAGE

092482102, Plymouth, IA

Built 2000 Load: 34.8 t ADT: 26

SOUTH RIDGE RD

Good

Over: PERRY CREEK

090473303, Plymouth, IA

Built 1978 Load: 35.1 t ADT: 518

320TH ST

Good

Over: W BR PERRY CREEK

090472803, Plymouth, IA

Built 2001 Load: 35.6 t ADT: 60

FOX AVE

Good

Over: PERRY CREEK

090473308, Plymouth, IA

Built 1983 Load: 35.6 t ADT: 170

ECHO ROAD

Good

Over: BROKEN KETTLE CREEK

091481403, Plymouth, IA

Built 1996 Load: 35.6 t ADT: 26

US 75

Good

Over: STREAM

0.1 mi. N of SR C70, Plymouth, IA

Built 2019 Load: 36.0 t ADT: 14,900

US 75

Good

Over: STREAM

0.3 mi N of SR C70, Plymouth, IA

Built 2019 Load: 36.0 t ADT: 14,900

US 75

Good

Over: STREAM

0.7 mi N of SR C70, Plymouth, IA

Built 2019 Load: 36.0 t ADT: 14,900

US 75

Good

Over: STREAM

1.5 mi. S of SR C60, Plymouth, IA

Built 2019 Load: 36.0 t ADT: 14,900

200TH ST

Good

Over: SMALL STREAM

092452703, Plymouth, IA

Built 1985 Load: 36.3 t ADT: 159

OTTER AVE

Good

Over: PLYMOUTH CREEK

9244290210, Plymouth, IA

Built 2016 Load: 36.6 t ADT: 34

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.