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)

270TH ST

Good

Over: CLEAR CREEK

091443501, Plymouth, IA

Built 1991 Load: 52.7 t ADT: 26

120TH ST

Good

Over: WILLOW CREEK

093441501, Plymouth, IA

Built 1989 Load: 52.7 t ADT: 5

PIONEER AVE

Good

Over: WILLOW CREEK

093441502, Plymouth, IA

Built 1990 Load: 52.7 t ADT: 15

C70

Good

Over: MUD CREEK

090443101, Plymouth, IA

Built 1999 Load: 52.9 t ADT: 450

280TH ST

Good

Over: PERRY CREEK

090470201, Plymouth, IA

Built 2005 Load: 52.9 t ADT: 11

325TH ST

Good

Over: PERRY CREEK

090472705, Plymouth, IA

Built 2006 Load: 52.9 t ADT: 319

FM

Good

Over: LITTLE SIOUX

091432301, Plymouth, IA

Built 1991 Load: 52.9 t ADT: 139

220TH ST

Good

Over: PLYMOUTH CREEK

091450301, Plymouth, IA

Built 2004 Load: 52.9 t ADT: 15

FM

Good

Over: WHISKEY CREEK

092433501, Plymouth, IA

Built 1997 Load: 52.9 t ADT: 848

160TH ST

Good

Over: MINK CREEK

092460301, Plymouth, IA

Built 2003 Load: 52.9 t ADT: 26

FM

Good

Over: WESTFIELD CREEK

092481702, Plymouth, IA

Built 1988 Load: 52.9 t ADT: 180

140TH ST

Good

Over: DEEP CREEK

093432801, Plymouth, IA

Built 2001 Load: 52.9 t ADT: 30

150TH ST

Good

Over: DEEP CREEK

093433201, Plymouth, IA

Built 2004 Load: 52.9 t ADT: 60

140TH ST

Good

Over: WILLOW CREEK

093442901, Plymouth, IA

Built 2000 Load: 52.9 t ADT: 20

150TH ST

Good

Over: WILLOW CREEK

093443101, Plymouth, IA

Built 1992 Load: 52.9 t ADT: 71

C44 230TH ST

Good

Over: FLOYD RIVER

9146110310, Plymouth, IA

Built 2019 Load: 56.7 t ADT: 439

FM C-38

Good

Over: WESTFIELD CREEK

092493601, Plymouth, IA

Built 1987 Load: 57.5 t ADT: 589

PIONEER AVE

Poor

Over: DEEP CREEK

092440302, Plymouth, IA

Built 1917 Load: 5.9 t ADT: 30

140TH ST

Poor

Over: FLOYD RIVER

093452605, Plymouth, IA

Built 1954 Load: 6.4 t ADT: 60

FIR AVE

Poor

Over: BROKEN KETTLE CREEK

092470402, Plymouth, IA

Built 1900 Load: 7.7 t ADT: 30

130TH ST

Poor

Over: W BR FLOYD RIVER

093451901, Plymouth, IA

Built 1900 Load: 8.1 t ADT: 20

LYNX AVE

Poor

Over: PLYMOUTH CREEK

091450402, Plymouth, IA

Built 1960 Load: 8.7 t ADT: 26

DOGWOOD AVE

Poor

Over: DRAINAGE

092482602, Plymouth, IA

Built 1970 Load: 9.5 t ADT: 15

300TH ST

Poor

Over: JOHN'S CREEK

090441301, Plymouth, IA

Built 1900 Load: 10.5 t ADT: 26

260TH

Poor

Over: JOHN'S CREEK

091442601, Plymouth, IA

Built 1966 Load: 10.6 t ADT: 11

170TH ST

Poor

Over: DRAINAGE

092460801, Plymouth, IA

Built 1900 Load: 10.7 t ADT: 34

310TH ST

Poor

Over: DRY BRANCH

090441901, Plymouth, IA

Built 1941 Load: 10.8 t ADT: 26

FM K-42

Poor

Over: CARTER CREEK

090460202, Plymouth, IA

Built 1941 Load: 10.8 t ADT: 190

LOCAL

Poor

Over: DEEP CREEK

093431001, Plymouth, IA

Built 1941 Load: 10.8 t ADT: 11

FAWN AVE

Poor

Over: DRAINAGE

092470802, Plymouth, IA

Built 1900 Load: 11.0 t ADT: 30

200TH ST

Poor

Over: W.BRANCH FLOYD RIVER

092462603, Plymouth, IA

Built 1960 Load: 11.1 t ADT: 71

EVERGREEN AVE

Poor

Over: DRAINAGE

091471902, Plymouth, IA

Built 1900 Load: 11.3 t ADT: 11

LONE TREE RD

Poor

Over: PERRY CREEK

090472205, Plymouth, IA

Built 1953 Load: 11.4 t ADT: 71

120TH ST

Poor

Over: INDIAN CREEK

093471801, Plymouth, IA

Built 1900 Load: 11.4 t ADT: 15

280TH ST

Poor

Over: DRY BRANCH

090440401, Plymouth, IA

Built 1900 Load: 12.2 t ADT: 11

310TH ST

Poor

Over: CREEK

090442001, Plymouth, IA

Built 1900 Load: 12.2 t ADT: 30

NOBLE AVE

Poor

Over: DEEP CREEK

093443104, Plymouth, IA

Built 1953 Load: 12.6 t ADT: 30

280TH ST

Poor

Over: MUD CREEK

090440601, Plymouth, IA

Built 1900 Load: 13.0 t ADT: 26

140TH ST

Poor

Over: DRAINAGE

093432901, Plymouth, IA

Built 1961 Load: 13.4 t ADT: 30

200TH ST

Poor

Over: MINK CREEK

092462701, Plymouth, IA

Built 1953 Load: 14.1 t ADT: 34

QUARTZ AVE

Poor

Over: WILLOW CREEK

093441202, Plymouth, IA

Built 1946 Load: 14.3 t ADT: 60

320TH ST

Poor

Over: CREEK

090442701, Plymouth, IA

Built 1900 Load: 14.7 t ADT: 30

LYNX AVE

Poor

Over: BIG WHISKEY CREEK

090450402, Plymouth, IA

Built 1958 Load: 14.7 t ADT: 50

220TH ST

Poor

Over: DRAINAGE

091450501, Plymouth, IA

Built 1958 Load: 14.7 t ADT: 26

200TH ST

Poor

Over: PLYMOUTH CREEK

092443001, Plymouth, IA

Built 1952 Load: 14.7 t ADT: 15

200TH ST

Poor

Over: DRAINAGE

092492603, Plymouth, IA

Built 1959 Load: 14.7 t ADT: 30

270TH ST

Poor

Over: DEER CREEK

091433201, Plymouth, IA

Built 1900 Load: 15.0 t ADT: 15

260TH ST

Poor

Over: JOHN'S CREEK

091442501, Plymouth, IA

Built 1900 Load: 15.0 t ADT: 11

240TH ST

Poor

Over: MUD CREEK

091441801, Plymouth, IA

Built 1900 Load: 15.1 t ADT: 5

140TH ST

Poor

Over: INDIAN CREEK

093473001, Plymouth, IA

Built 1956 Load: 15.5 t ADT: 20

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