Grundy County, IA

270 public highway bridges

Grundy County Bridge Snapshot

Grundy County, Iowa contains 270 public highway bridges in the FHWA National Bridge Inventory. Roughly 37.4% are rated “Good,” 30% “Fair,” 25.9% “Poor,” and 25.9% 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.

270

Total Bridges

37.4%

Good

25.9%

Poor

25.9%

Structurally Deficient

Condition Distribution

Good

37.4% (101)

Fair

30% (81)

Poor

25.9% (70)

SD

25.9% (70)

All Bridges (270)

Sort:

US 20 EB OFF RAMP

Over: SOUTH BEAVER CREEK

0.1 MILE W OF JCT SR T19, Grundy, IA

Built 2003 Load: 23.9 t ADT: 350

250TH ST

Over: MUNNS CREEK

087162201, Grundy, IA

Built 2006 Load: 28.7 t ADT: 11

LOCAL

Over: SOUTH FORK BEAVER CREEK

089173302, Grundy, IA

Built 1985 Load: 29.4 t ADT: 33

LOCAL ROAD

Over: WOLF CREEK

086173302, Grundy, IA

Built 1978 Load: 29.9 t ADT: 70

LOCAL

Over: SOUTH FORK OF BEAVER CK

088180902, Grundy, IA

Built 1984 Load: 29.9 t ADT: 78

LOCAL

Over: HAMMERS CREEK

089150101, Grundy, IA

Built 2009 Load: 30.1 t ADT: 70

FM

Over: MOSQUITO CREEK

087153101, Grundy, IA

Built 1981 Load: 30.8 t ADT: 44

FM

Over: MOSQUITO CREEK

087163602, Grundy, IA

Built 1983 Load: 30.8 t ADT: 39

LOCAL

Over: PHELPS CREEK

089160603, Grundy, IA

Built 1987 Load: 31.5 t ADT: 59

H AVE

Over: BRANCH WOLF CREEK

086173004, Grundy, IA

Built 2018 Load: 32.4 t ADT: 29

T37 M AVE

Over: WOLF CREEK

086173602, Grundy, IA

Built 2019 Load: 32.4 t ADT: 79

300TH ST

Over: WOLF CREEK

086181501, Grundy, IA

Built 2020 Load: 32.4 t ADT: 26

X AVE

Over: BRANCH BLACKHAWK CREEK

087150202, Grundy, IA

Built 2018 Load: 32.4 t ADT: 26

230TH ST

Over: BLACK HAWK CREEK

087151201, Grundy, IA

Built 2012 Load: 32.4 t ADT: 33

R AVE

Over: MUNNS CREEK

087161402, Grundy, IA

Built 2016 Load: 32.4 t ADT: 59

180TH ST

Over: BLACK HAWK CREEK

088151801, Grundy, IA

Built 2015 Load: 32.4 t ADT: 44

SR D35

Over: BLACK HAWK CREEK

088153503, Grundy, IA

Built 2011 Load: 32.4 t ADT: 903

G AVE

Over: S FORK OF BEAVER CREEK

089173102, Grundy, IA

Built 2017 Load: 32.4 t ADT: 39

FM

Over: BRANCH OF LITTLE WOLF CR

086171202, Grundy, IA

Built 1987 Load: 32.7 t ADT: 29

KING AVE

Over: BRANCH WOLF CREEK

086173408, Grundy, IA

Built 2000 Load: 32.7 t ADT: 11

LOCAL

Over: DOWD CREEK

086180401, Grundy, IA

Built 1990 Load: 32.7 t ADT: 39

LOCAL

Over: BLACK HAWK CREEK

087153501, Grundy, IA

Built 1986 Load: 32.7 t ADT: 59

LOCAL

Over: BLACKHAWK CREEK ,BRANCH

087180302, Grundy, IA

Built 1977 Load: 32.7 t ADT: 70

LOCAL

Over: BRANCH OF BLACKHAWK CRK

088151001, Grundy, IA

Built 1987 Load: 32.7 t ADT: 11

175TH ST

Over: BRANCH BLACK HAWK CREEK

088151203, Grundy, IA

Built 2015 Load: 32.7 t ADT: 70

FM

Over: BLACKHAWK CREEK ,BRANCH

088152202, Grundy, IA

Built 1989 Load: 32.7 t ADT: 20

LOCAL

Over: BLACKHAWK CREEK

088161001, Grundy, IA

Built 1995 Load: 32.7 t ADT: 44

FM

Over: BR.BLACKHAWK CREEK

088162201, Grundy, IA

Built 1986 Load: 32.7 t ADT: 255

LOCAL

Over: FORK OF BLACKHAWK CREEK

088171202, Grundy, IA

Built 1984 Load: 32.7 t ADT: 26

LOCAL RD

Over: BR BLACK HAWK CREEK

088173302, Grundy, IA

Built 2002 Load: 32.7 t ADT: 49

LOCAL

Over: BRANCH BEAVER CREEK

088180903, Grundy, IA

Built 1992 Load: 32.7 t ADT: 39

LOCAL ROAD

Over: BRANCH BEAVER CREEK

089160101, Grundy, IA

Built 1991 Load: 32.7 t ADT: 70

LOCAL

Over: BRANCH OF BEAVER CREEK

089160701, Grundy, IA

Built 1991 Load: 32.7 t ADT: 26

LOCAL

Over: FORK OF BEAVER CREEK

089160901, Grundy, IA

Built 1985 Load: 32.7 t ADT: 39

LOCAL

Over: BRANCH BLACKHAWK CREEK

089162202, Grundy, IA

Built 1991 Load: 32.7 t ADT: 15

FM

Over: BLACKHAWK CREEK BRANCH

089162602, Grundy, IA

Built 1996 Load: 32.7 t ADT: 226

LOCAL

Over: BRANCH OF BLACKHAWK CK

089162701, Grundy, IA

Built 1987 Load: 32.7 t ADT: 26

LOCAL

Over: CREEK

089170601, Grundy, IA

Built 2003 Load: 32.7 t ADT: 33

LOCAL

Over: BR BEAVER CREEK

089181801, Grundy, IA

Built 1996 Load: 32.7 t ADT: 97

A AVE

Over: BRANCH BEAVER CREEK

089181802, Grundy, IA

Built 2012 Load: 32.7 t ADT: 15

FM

Over: FORK WOLF CREEK

086173405, Grundy, IA

Built 1983 Load: 32.7 t ADT: 246

E AVE

Over: SOUTH FORK BEAVER CREEK

088181502, Grundy, IA

Built 2012 Load: 32.7 t ADT: 49

260TH ST

Over: DOWD CREEK

87182801, Grundy, IA

Built 2013 Load: 32.7 t ADT: 20

C AVE

Over: STREAM

088182902, Grundy, IA

Built 2014 Load: 32.7 t ADT: 5

T13 D AVE

Over: WATERWAY

089181002, Grundy, IA

Built 2015 Load: 32.7 t ADT: 805

250TH ST

Over: BLACK HAWK CREEK

087152401, Grundy, IA

Built 2016 Load: 32.7 t ADT: 29

K AVE

Over: BLACK HAWK CREEK

088171002, Grundy, IA

Built 2016 Load: 32.7 t ADT: 39

H AVE

Over: WOLF CREEK

087171902, Grundy, IA

Built 2018 Load: 32.7 t ADT: 44

230TH ST

Over: TRIB OF BLACK HAWK CK

087150801, Grundy, IA

Built 2018 Load: 32.7 t ADT: 11

120TH ST

Over: MIDDLE FORK BEAVER CREEK

089181701, Grundy, IA

Built 2019 Load: 32.7 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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026