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:

FM

Over: WOLF CREEK

086173404, Grundy, IA

Built 1982 Load: 29.9 t ADT: 1,493

LOCAL

Over: BR BLACKHAWK CREEK

087170702, Grundy, IA

Built 1979 Load: 29.9 t ADT: 49

LOCAL

Over: BR BLACKHAWK CREEK

087170903, Grundy, IA

Built 1978 Load: 29.9 t ADT: 88

LOCAL ROAD

Over: BLACKHAWK CREEK

087181001, Grundy, IA

Built 1977 Load: 29.9 t ADT: 70

FM

Over: BLACK HAWK CREEK

088150802, Grundy, IA

Built 1974 Load: 29.9 t ADT: 1,404

FM

Over: BEAVER CREEK

088181503, Grundy, IA

Built 1974 Load: 29.9 t ADT: 265

FM

Over: BEAVER CREEK ,BRANCH

089182001, Grundy, IA

Built 1971 Load: 29.9 t ADT: 79

LOCAL

Over: BR BLACKHAWK CREEK

087170202, Grundy, IA

Built 1979 Load: 30.2 t ADT: 59

FM

Over: FORK OF MINNEHAHA CREEK

087160704, Grundy, IA

Built 1986 Load: 30.8 t ADT: 324

LOCAL ROAD

Over: BRANCH BLACKHAWK CRK

088173202, Grundy, IA

Built 1976 Load: 30.8 t ADT: 49

FM

Over: BLACK HAWK

088173503, Grundy, IA

Built 1981 Load: 30.8 t ADT: 79

LOCAL ROAD

Over: MUNNS CREEK

087162601, Grundy, IA

Built 1956 Load: 31.0 t ADT: 26

IA 175

Over: BRANCH BLACKHAWK CREEK

0.8 MILE W OF JCT SR T69, Grundy, IA

Built 1977 Load: 31.2 t ADT: 2,080

FM

Over: HAMMERS CREEK

089151202, Grundy, IA

Built 1981 Load: 31.2 t ADT: 34

LOCAL ROAD

Over: BRANCH BEAR CREEK

087183001, Grundy, IA

Built 1955 Load: 31.9 t ADT: 49

D19 160TH ST

Over: BR N BLACKHAWK CREEK

088150303, Grundy, IA

Built 1985 Load: 32.7 t ADT: 786

F AVE

Over: SMALL NATURAL STREAM

087181102, Grundy, IA

Built 1969 Load: 32.7 t ADT: 1,169

FM

Over: BR WOLF CREEK

086170102, Grundy, IA

Built 1977 Load: 32.7 t ADT: 69

LOCAL ROAD

Over: DOWD CREEK

086180901, Grundy, IA

Built 1978 Load: 32.7 t ADT: 49

LOCAL

Over: WOLF CREEK

086181001, Grundy, IA

Built 1975 Load: 32.7 t ADT: 49

LOCAL

Over: FORK OF DOWD CREEK

086181603, Grundy, IA

Built 1985 Load: 32.7 t ADT: 49

LOCAL

Over: BRANCH BLACK HAWK CREEK

087161802, Grundy, IA

Built 1994 Load: 32.7 t ADT: 69

FM

Over: MUNNS CREEK

087162202, Grundy, IA

Built 1994 Load: 32.7 t ADT: 628

FM

Over: BR BLACKHAWK CK

088152002, Grundy, IA

Built 1977 Load: 32.7 t ADT: 1,051

LOCAL

Over: BLACK HAWK CREEK

088160102, Grundy, IA

Built 1991 Load: 32.7 t ADT: 33

LOCAL

Over: BRANCH BLACKHAWK CREEK

088171102, Grundy, IA

Built 1988 Load: 32.7 t ADT: 33

205TH ST

Over: BLACKHAWK CREEK

088172703, Grundy, IA

Built 1993 Load: 32.7 t ADT: 452

FM

Over: BRANCH BLACKHAWK CREEK

088172704, Grundy, IA

Built 1988 Load: 32.7 t ADT: 34

LOCAL

Over: BRANCH BEAVER CREEK

088180904, Grundy, IA

Built 1988 Load: 32.7 t ADT: 70

LOCAL

Over: FORK OF BEAVER CREEK

088181502, Grundy, IA

Built 1984 Load: 32.7 t ADT: 44

FM

Over: BRANCH OF IOWA RIVER

088183102, Grundy, IA

Built 1987 Load: 32.7 t ADT: 79

LOCAL

Over: BRANCH BLACKHAWK CREEK

089153201, Grundy, IA

Built 1988 Load: 32.7 t ADT: 49

FM

Over: BEAVER CREEK ,BRANCH

089172702, Grundy, IA

Built 1970 Load: 32.7 t ADT: 69

FM

Over: BEAVER CREEK ,NORTH FORK

089181302, Grundy, IA

Built 1989 Load: 32.7 t ADT: 452

FM

Over: BEAVER CREEK ,NORTH FORK

089182401, Grundy, IA

Built 1990 Load: 32.7 t ADT: 373

LOCAL

Over: STREAM

089151401, Grundy, IA

Built 1977 Load: 33.0 t ADT: 97

LOCAL ROAD

Over: BRANCH BLACKHAWK CREEK

087150402, Grundy, IA

Built 1966 Load: 33.9 t ADT: 59

LOCAL

Over: BLACKHAWK CREEK

088161001, Grundy, IA

Built 1957 Load: 34.2 t ADT: 44

FM

Over: BRANCH BEAVER CREEK

089172301, Grundy, IA

Built 1970 Load: 36.1 t ADT: 501

LOCAL ROAD

Over: WOLF X CREEK

087182501, Grundy, IA

Built 1957 Load: 36.2 t ADT: 11

FM

Over: BEAVER CREEK

089172202, Grundy, IA

Built 1972 Load: 36.3 t ADT: 79

FM

Over: DRAINAGE DITCH

088182903, Grundy, IA

Built 1955 Load: 36.7 t ADT: 491

FM

Over: CREEK

089152301, Grundy, IA

Built 1966 Load: 36.9 t ADT: 707

FM

Over: WOLF CREEK, BRANCH

086182401, Grundy, IA

Built 1989 Load: 37.2 t ADT: 59

LOCAL

Over: FK OF BLACKHAWK CREEK

087172401, Grundy, IA

Built 1997 Load: 38.8 t ADT: 44

FM

Over: BLACKHAWK CREEK ,BRANCH

088163303, Grundy, IA

Built 1964 Load: 40.7 t ADT: 550

FM

Over: WOLF CREEK

087183501, Grundy, IA

Built 1964 Load: 43.2 t ADT: 98

LOCAL RD

Over: BRANCH BLACKHAWK CREEK

089162401, Grundy, IA

Built 1957 Load: 43.3 t ADT: 29

FM

Over: BLACKHAWK CREEK ,BRANCH

087160102, Grundy, IA

Built 1966 Load: 47.8 t ADT: 579

US 20 WB ON RAMP

Over: BEAVER CREEK

0.1 MILE W OF JCT SR T19, Grundy, IA

Built 2003 Load: 23.3 t ADT: 340

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 5, 2026