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)

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