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)

Sort:

SB US 75

Over: DRAINAGE DITCH

2.6 mi S of jct SR C44, Plymouth, IA

Built 1948 Load: 23.5 t ADT: 7,000

200TH ST

Over: BIG WHISKEY SLOUGH

092432601, Plymouth, IA

Built 1987 Load: 23.8 t ADT: 15

SUNSET AVE

Over: DD

091432302, Plymouth, IA

Built 1956 Load: 23.9 t ADT: 15

PIONEER AVE

Over: DRAINAGE

092440302, Plymouth, IA

Built 1991 Load: 23.9 t ADT: 30

FM C-60

Over: WEST FORK LITTLE SIOUX

090431001, Plymouth, IA

Built 1963 Load: 24.2 t ADT: 290

FM

Over: MINK CREEK

093462702, Plymouth, IA

Built 1961 Load: 24.5 t ADT: 628

220TH ST

Over: DRAINAGE

091440201, Plymouth, IA

Built 1900 Load: 25.9 t ADT: 15

FM

Over: PERRY CREEK

091472602, Plymouth, IA

Built 1970 Load: 26.0 t ADT: 1,028

170TH ST

Over: MINK CREEK

092460903, Plymouth, IA

Built 1934 Load: 26.0 t ADT: 60

FM

Over: PERRY CREEK

090472704, Plymouth, IA

Built 1970 Load: 26.3 t ADT: 2,134

QUORN RD

Over: WEST FORK LITTLE SIOUX

090442504, Plymouth, IA

Built 1965 Load: 26.8 t ADT: 40

FM

Over: CREEK

092433401, Plymouth, IA

Built 1976 Load: 27.0 t ADT: 848

MALLARD AVE

Over: SMALL NATURAL STREAM

093452329, Plymouth, IA

Built 1974 Load: 27.1 t ADT: 5

IA 404 SB

Over: FLOYD RIVER

0.4 mi. N of jct. IA 3, Plymouth, IA

Built 1957 Load: 27.5 t ADT: 2,410

IA 3

Over: STREAM

2.5 MI. E of US 75 (Bus.), Plymouth, IA

Built 1994 Load: 28.5 t ADT: 3,820

FM K-64

Over: DRAINAGE

090441702, Plymouth, IA

Built 1973 Load: 28.6 t ADT: 110

SB US 75

Over: STREAM

1.3 mi. N of SR C70, Plymouth, IA

Built 1948 Load: 29.0 t ADT: 7,500

FM

Over: BIG SIOUX RIVER

90948, Plymouth, IA

Built 1967 Load: 29.3 t ADT: 589

IA 140

Over: RATHBURN CREEK

3.3 mi S of SR C38, Plymouth, IA

Built 1964 Load: 29.5 t ADT: 970

FM K-49

Over: WHISKEY CREEK

091452702, Plymouth, IA

Built 1974 Load: 30.0 t ADT: 818

L-22

Over: LITTLE SIOUX RIVER

092432402, Plymouth, IA

Built 1974 Load: 30.0 t ADT: 139

FM C-38

Over: DRAINAGE

092453301, Plymouth, IA

Built 1977 Load: 30.0 t ADT: 1,615

SB US 75

Over: DRY CREEK

3.4 mi. N of jct. SR C60, Plymouth, IA

Built 1948 Load: 30.2 t ADT: 7,000

FM K-49

Over: PLYMOUTH CR

091450302, Plymouth, IA

Built 1974 Load: 30.2 t ADT: 1,236

FM

Over: JOHN'S CREEK

092443601, Plymouth, IA

Built 1976 Load: 30.2 t ADT: 1,157

FM

Over: INDIAN CREEK

093481202, Plymouth, IA

Built 1971 Load: 30.2 t ADT: 219

FM

Over: JOHN'S CREEK

090441201, Plymouth, IA

Built 1971 Load: 30.4 t ADT: 259

FM

Over: WILLOW CREEK

093442101, Plymouth, IA

Built 1967 Load: 30.4 t ADT: 589

FM

Over: WILLOW CREEK

093442102, Plymouth, IA

Built 1968 Load: 30.4 t ADT: 748

FM

Over: MINK CREEK

093462801, Plymouth, IA

Built 1967 Load: 30.6 t ADT: 190

SB US 75

Over: STREAM

1.3 mi. N of S.R. C-60, Plymouth, IA

Built 1948 Load: 31.6 t ADT: 7,000

FM K-18

Over: STREAM

091481104, Plymouth, IA

Built 1979 Load: 31.7 t ADT: 429

SB US 75

Over: DRY CREEK

1.9 mi. N of jct. SR C60, Plymouth, IA

Built 1948 Load: 32.2 t ADT: 7,000

SB US 75

Over: DRY CREEK

2.3 mi. N of SR C60, Plymouth, IA

Built 1948 Load: 32.3 t ADT: 7,000

SB US 75

Over: DRY CREEK

1.5 mi. S of SR C44, Plymouth, IA

Built 1948 Load: 32.3 t ADT: 7,000

FM

Over: DRAINAGE

091462303, Plymouth, IA

Built 1966 Load: 32.3 t ADT: 190

FM

Over: DRAINAGE DITCH

090432702, Plymouth, IA

Built 1932 Load: 32.7 t ADT: 139

FM

Over: PERRY CREEK

090470901, Plymouth, IA

Built 1940 Load: 32.7 t ADT: 159

FM

Over: DRAINAGE DITCH

091432101, Plymouth, IA

Built 1933 Load: 32.7 t ADT: 139

FM

Over: DRAINAGE

091461202, Plymouth, IA

Built 1966 Load: 32.7 t ADT: 190

FM

Over: MINNIE CREEK

092452702, Plymouth, IA

Built 1975 Load: 32.7 t ADT: 1,446

FM

Over: DRAINAGE

092483501, Plymouth, IA

Built 1960 Load: 32.7 t ADT: 669

200TH STREET

Over: FLOYD RIVER

F22030515, Plymouth, IA

Built 2007 Load: 32.7 t ADT: 8,224

FM K-49

Over: MUDDY CREEK

090451502, Plymouth, IA

Built 1974 Load: 33.0 t ADT: 509

FM

Over: SMALL

093472302, Plymouth, IA

Built 1978 Load: 33.0 t ADT: 688

IA 3

Over: FLOYD RIVER

1.0 mi. E of US 75, Plymouth, IA

Built 1981 Load: 33.2 t ADT: 4,270

LOCAL

Over: WILLOW CREEK

093443602, Plymouth, IA

Built 1967 Load: 33.9 t ADT: 319

OMEGA AVE

Over: CREEK

090441704, Plymouth, IA

Built 1900 Load: 34.1 t ADT: 5

IA 3

Over: MINK CREEK

0.4 mi W of SR K42, Plymouth, IA

Built 1954 Load: 35.7 t ADT: 1,420

IA 3

Over: WESTFIELD CREEK

0.2 mi. W of W jct. IA 12, Plymouth, IA

Built 1962 Load: 36.9 t ADT: 1,570

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

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