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:

LOCAL

Over: BLACK HAWK CREEK

088171101, Grundy, IA

Built 1977 Load: 15.0 t ADT: 70

FM

Over: BEAVER CREEK ,BRANCH

089182001, Grundy, IA

Built 1954 Load: 15.7 t ADT: 79

FM

Over: DOWD CREEK, BRANCH

086182101, Grundy, IA

Built 1966 Load: 16.4 t ADT: 187

LOCAL ROAD

Over: WOLF CREEK

086180202, Grundy, IA

Built 1970 Load: 16.7 t ADT: 11

LOCAL

Over: BR BEAVER CREEK

089172802, Grundy, IA

Built 1979 Load: 16.7 t ADT: 15

LOCAL

Over: BRANCH WOLF CREEK

086181303, Grundy, IA

Built 1914 Load: 17.0 t ADT: 5

LOCAL ROAD

Over: CREEK

087151304, Grundy, IA

Built 1977 Load: 21.7 t ADT: 15

LOCAL ROAD

Over: MUNNS CREEK

087162102, Grundy, IA

Built 1971 Load: 21.8 t ADT: 29

FM

Over: BLACKHAWK CREEK

087161304, Grundy, IA

Built 1967 Load: 22.6 t ADT: 579

LOCAL ROAD

Over: N FORK OF BEAVER CREEK

089171902, Grundy, IA

Built 1947 Load: 23.0 t ADT: 15

LOCAL ROAD

Over: BRANCH BLACK HAWK CREEK

087153502, Grundy, IA

Built 1973 Load: 23.3 t ADT: 44

LOCAL ROAD

Over: MIDDLE FORK BEAVER CREEK

089172902, Grundy, IA

Built 1948 Load: 24.1 t ADT: 39

LOCAL ROAD

Over: BRANCH OF WOLF CREEK

086171803, Grundy, IA

Built 1977 Load: 24.6 t ADT: 44

LOCAL ROAD

Over: BRANCH OF WOLF CREEK

086171803, Grundy, IA

Built 1977 Load: 25.2 t ADT: 44

LOCAL ROAD

Over: MIDDLE FORK OF BEAVER CR

089182802, Grundy, IA

Built 1976 Load: 25.4 t ADT: 20

LOCAL ROAD

Over: BLACK HAWK CREEK

087151403, Grundy, IA

Built 1979 Load: 25.5 t ADT: 20

LOCAL

Over: BR BEAVER CREEK

089171401, Grundy, IA

Built 1978 Load: 25.5 t ADT: 44

LOCAL

Over: WOLF CREEK

086180201, Grundy, IA

Built 1978 Load: 25.7 t ADT: 49

LOCAL RD

Over: SOUTH FORK BEAVER CREEK

088180903, Grundy, IA

Built 1977 Load: 25.8 t ADT: 39

FM

Over: WOLF CREEK

086182301, Grundy, IA

Built 1966 Load: 26.3 t ADT: 187

FM

Over: BRANCH BEAVER CREEK

089171502, Grundy, IA

Built 1966 Load: 26.8 t ADT: 393

LOCAL ROAD

Over: NORTH FORK BEAVER

089172902, Grundy, IA

Built 1981 Load: 27.4 t ADT: 39

LOCAL ROAD

Over: BRANCH OF WOLF CREEK

086172602, Grundy, IA

Built 1976 Load: 28.4 t ADT: 59

FM

Over: MOSQUITO CREEK

087152902, Grundy, IA

Built 1977 Load: 29.9 t ADT: 501

FM

Over: BLACKHAWK CREEK

088173602, Grundy, IA

Built 1971 Load: 29.9 t ADT: 1,935

LOCAL ROAD

Over: BRANCH OF WOLF CREEK

086172901, Grundy, IA

Built 1976 Load: 30.6 t ADT: 11

LOCAL

Over: LITTLE WOLF CREEK

086170201, Grundy, IA

Built 1976 Load: 30.8 t ADT: 33

FM

Over: BLACK HAWK CREEK

087152202, Grundy, IA

Built 1973 Load: 30.8 t ADT: 412

LOCAL

Over: MOSQUITO CREEK

087163302, Grundy, IA

Built 1983 Load: 30.8 t ADT: 33

LOCAL RD

Over: BRANCH BLACKHAWK CREEK

088172601, Grundy, IA

Built 1956 Load: 31.0 t ADT: 15

FM

Over: BLACK HAWK CREEK

087152002, Grundy, IA

Built 1979 Load: 31.4 t ADT: 687

FM

Over: BRANCH BLACK HAWK CREEK

087150302, Grundy, IA

Built 1973 Load: 32.7 t ADT: 412

FM

Over: WOLF CREEK, BRANCH

086170801, Grundy, IA

Built 1972 Load: 32.8 t ADT: 285

FM

Over: BEAVER CREEK

089172201, Grundy, IA

Built 1973 Load: 36.3 t ADT: 501

FM

Over: BEAVER CREEK ,BRANCH

088181705, Grundy, IA

Built 1932 Load: 37.1 t ADT: 265

FM

Over: DOWD CREEK

086183004, Grundy, IA

Built 1972 Load: 37.6 t ADT: 491

FM

Over: DOWD CREEK

087183301, Grundy, IA

Built 1964 Load: 43.5 t ADT: 98

LOCAL

Over: MUNNS CREEK

087163003, Grundy, IA

Built 1957 Load: 46.7 t ADT: 20

FM

Over: WOLF CREEK, BRANCH

086170704, Grundy, IA

Built 1972 Load: 60.4 t ADT: 373

FM

Over: WOLF CREEK, BRANCH

086173201, Grundy, IA

Built 1975 Load: 99.9 t ADT: 1,394

LOCAL ROAD

Structurally Deficient

Over: DOWD CREEK

086181601, Grundy, IA

Built 1977 ADT: 15

LOCAL

Structurally Deficient

Over: BRANCH BLACKHAWK CREEK

087170303, Grundy, IA

Built 1955 ADT: 33

FM

Structurally Deficient

Over: BLACKHAWK CREEK ,BRANCH

087171302, Grundy, IA

Built 1965 ADT: 275

LOCAL ROAD

Structurally Deficient

Over: BRANCH OF WOLF CREEK

087173502, Grundy, IA

Built 1953 ADT: 15

LOCAL

Structurally Deficient

Over: BRANCH OF BLACKHAWK CRK

088173102, Grundy, IA

Built 1976 ADT: 71

FM

Structurally Deficient

Over: BRANCH BEAVER CREEK

089150302, Grundy, IA

Built 1968 ADT: 619

LOCAL ROAD

Structurally Deficient

Over: BEAVER CREEK

089172801, Grundy, IA

Built 1948 ADT: 11

LOCAL ROAD

Structurally Deficient

Over: MIDDLE FORK BEAVER CREEK

089181801, Grundy, IA

Built 1952 ADT: 99

LOCAL RD

Structurally Deficient

Over: BLACK HAWK CREEK

088161602, Grundy, IA

Built 1971 Load: 3.8 t ADT: 11

LOCAL

Structurally Deficient

Over: BRANCH OF BEAVER CREEK

089170602, Grundy, IA

Built 1953 Load: 4.1 t ADT: 40

Read our methodology — how this data is sourced, computed, and verified.

Related

Browse all → | Rankings →

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