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)

NOBLE AVE

Good

Over: MUD CREEK

090440602, Plymouth, IA

Built 2004 Load: 44.4 t ADT: 50

160TH ST

Good

Over: DEEP CREEK

92440301, Plymouth, IA

Built 2015 Load: 44.4 t ADT: 40

130TH ST

Good

Over: BROKEN KETTLE CREEK

934723011040, Plymouth, IA

Built 2013 Load: 44.4 t ADT: 26

260TH ST

Good

Over: MUD CREEK

091442901, Plymouth, IA

Built 1996 Load: 44.5 t ADT: 50

270TH ST

Good

Over: MUD CREEK

091443101, Plymouth, IA

Built 1995 Load: 44.5 t ADT: 60

270TH ST

Good

Over: DRY BRANCH

091443301, Plymouth, IA

Built 1997 Load: 44.5 t ADT: 45

220TH ST

Good

Over: PERRY CREEK

091470101, Plymouth, IA

Built 1997 Load: 44.5 t ADT: 26

TAMARACK AVE

Good

Over: LITTLE SIOUX RIVER

904301021002, Plymouth, IA

Built 2017 Load: 44.7 t ADT: 26

120TH ST

Good

Over: DRAINAGE

93-48-13-01-10-40, Plymouth, IA

Built 2013 Load: 45.0 t ADT: 26

310TH ST

Good

Over: MUDDY CREEK

090452101, Plymouth, IA

Built 1999 Load: 45.4 t ADT: 34

250TH ST

Good

Over: MUD CREEK

091442001, Plymouth, IA

Built 2000 Load: 45.4 t ADT: 190

IDEAL ROAD

Good

Over: DRAINAGE

091461701, Plymouth, IA

Built 2003 Load: 45.4 t ADT: 20

FM

Good

Over: PERRY CREEK

091471201, Plymouth, IA

Built 1995 Load: 45.4 t ADT: 259

NOBLE AVE

Good

Over: PLYMOUTH CREEK

092441902, Plymouth, IA

Built 2000 Load: 45.4 t ADT: 80

LAKE AVE

Good

Over: WEST FORK FLOYD RIVER

093450704, Plymouth, IA

Built 1999 Load: 45.4 t ADT: 26

130TH ST

Good

Over: MINK CREEK

093462101, Plymouth, IA

Built 2002 Load: 45.4 t ADT: 60

LAKE AVE

Good

Over: MINNIE BROOK

090450502, Plymouth, IA

Built 1998 Load: 45.5 t ADT: 50

280TH ST

Good

Over: DRAINAGE

090460201, Plymouth, IA

Built 1990 Load: 45.5 t ADT: 80

270TH ST

Good

Over: DEER CREEK

091433201, Plymouth, IA

Built 1997 Load: 45.5 t ADT: 15

280TH ST

Good

Over: MINNIE BROOK

090450501, Plymouth, IA

Built 2004 Load: 45.7 t ADT: 15

240TH ST

Good

Over: RATHBURN CREEK

091431701, Plymouth, IA

Built 2000 Load: 45.7 t ADT: 34

MARBLE AVE

Good

Over: WHISKEY CREEK

091452302, Plymouth, IA

Built 2003 Load: 45.7 t ADT: 34

270TH ST

Good

Over: PERRY CREEK

9147350120, Plymouth, IA

Built 2018 Load: 45.7 t ADT: 80

DIAMOND AVE

Good

Over: WESTFIELD CREEK

092481502, Plymouth, IA

Built 2002 Load: 45.7 t ADT: 15

130TH ST

Good

Over: MINK CREEK

093462101, Plymouth, IA

Built 2004 Load: 45.7 t ADT: 60

GRANITE AVE

Good

Over: BULL RUN

9247150210, Plymouth, IA

Built 2019 Load: 46.0 t ADT: 26

180TH ST

Good

Over: BR OF WHISKEY CREEK

9243130110, Plymouth, IA

Built 2016 Load: 46.7 t ADT: 15

150TH ST

Good

Over: WOLF CREEK

9345330110, Plymouth, IA

Built 2016 Load: 46.7 t ADT: 71

MARBLE AVE

Good

Over: ELLIOT CREEK

90450210, Plymouth, IA

Built 2020 Load: 48.0 t ADT: 26

190TH ST

Good

Over: BIG WHISKEY SLOUGH

092432301, Plymouth, IA

Built 1990 Load: 48.0 t ADT: 26

FM C-60

Good

Over: DRY BRANCH

090440901, Plymouth, IA

Built 1992 Load: 48.2 t ADT: 439

LAKE AVE

Good

Over: BIG WHISKEY CREEK

090450804, Plymouth, IA

Built 2002 Load: 48.2 t ADT: 71

180TH ST

Good

Over: BIG WHISKEY SLOUGH

092431401, Plymouth, IA

Built 2006 Load: 48.2 t ADT: 15

C66 310TH ST

Good

Over: LITTLE SIOUX RIVER

9043190110, Plymouth, IA

Built 2018 Load: 49.6 t ADT: 309

322ND ST

Good

Over: BR OF W F LITTLE SIOUX

090442503, Plymouth, IA

Built 1998 Load: 49.8 t ADT: 210

QUARTZ AVE

Good

Over: WILLOW CREEK

093440102, Plymouth, IA

Built 1997 Load: 49.8 t ADT: 30

C30 190TH ST

Good

Over: PLYMOUTH CREEK

9244190110, Plymouth, IA

Built 2020 Load: 49.9 t ADT: 789

FM C-60

Good

Over: DEEP CREEK

090430801, Plymouth, IA

Built 1990 Load: 50.0 t ADT: 290

300TH ST

Good

Over: DRY BRANCH

090441601, Plymouth, IA

Built 2002 Load: 50.0 t ADT: 45

NOBLE AVE

Good

Over: MUD CREEK

090441902, Plymouth, IA

Built 2002 Load: 50.0 t ADT: 26

FM C-60

Good

Over: BIG WHISKEY CREEK

090450801, Plymouth, IA

Built 2006 Load: 50.0 t ADT: 628

QUARTZ AVE

Good

Over: CLEAR CREEK

091440102, Plymouth, IA

Built 2000 Load: 50.0 t ADT: 30

250TH ST

Good

Over: PERRY CREEK

091472201, Plymouth, IA

Built 2003 Load: 50.0 t ADT: 45

FM

Good

Over: DEER CREEK

091482204, Plymouth, IA

Built 2003 Load: 50.0 t ADT: 429

NOBLE AVE

Good

Over: PLYMOUTH CREEK

092441902, Plymouth, IA

Built 2000 Load: 50.0 t ADT: 80

FM

Good

Over: BULL RUN

092473201, Plymouth, IA

Built 1995 Load: 50.0 t ADT: 838

260TH ST

Good

Over: CREEK

091462901, Plymouth, IA

Built 2002 Load: 50.2 t ADT: 26

280TH ST

Good

Over: JOHN'S CREEK

090440101, Plymouth, IA

Built 1992 Load: 52.7 t ADT: 5

300TH ST

Good

Over: PERRY CREEK

090471503, Plymouth, IA

Built 1991 Load: 52.7 t ADT: 71

308TH ST

Good

Over: W BR PERRY CREEK

090471603, Plymouth, IA

Built 1998 Load: 52.7 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