Union County, IA

153 public highway bridges

Union County Bridge Snapshot

Union County, Iowa contains 153 public highway bridges in the FHWA National Bridge Inventory. Roughly 30.7% are rated “Good,” 34% “Fair,” 35.3% “Poor,” and 35.3% 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.

153

Total Bridges

30.7%

Good

35.3%

Poor

35.3%

Structurally Deficient

Condition Distribution

Good

30.7% (47)

Fair

34% (52)

Poor

35.3% (54)

SD

35.3% (54)

All Bridges (153)

Sort:

H29 167TH ST

Over: FOUR MILE CREEK

072280205, Union, IA

Built 1952 ADT: 20

FM

Over: FOUR MILE CREEK

073282501, Union, IA

Built 1952 Load: 6.0 t ADT: 50

LOCAL

Over: SMALL STREAM

071303501, Union, IA

Built 1940 Load: 7.9 t ADT: 11

FM

Over: TWELVE MILE CREEK

071290204, Union, IA

Built 1957 Load: 10.0 t ADT: 40

FM

Over: STREAM

071293401, Union, IA

Built 1960 Load: 14.1 t ADT: 45

LOCAL

Over: STREAM

072312101, Union, IA

Built 1981 Load: 16.7 t ADT: 123

LOCAL

Over: SMALL STREAM

072283605, Union, IA

Built 2002 Load: 17.1 t ADT: 26

FM

Over: GRAND RIVER

072283301, Union, IA

Built 1957 Load: 17.3 t ADT: 49

LOCAL

Over: TWELVE MILE CREEK

071290202, Union, IA

Built 1970 Load: 19.2 t ADT: 46

LOCAL

Over: INDIAN CREEK

071290702, Union, IA

Built 1999 Load: 21.3 t ADT: 11

FM

Over: TWELVE MILE CREEK

072293403, Union, IA

Built 1956 Load: 21.9 t ADT: 128

FM

Over: MIDDLE PLATTE RIVER

071312107, Union, IA

Built 1967 Load: 22.3 t ADT: 15

LOCAL

Over: WEST PLATTE

072313102, Union, IA

Built 1979 Load: 22.3 t ADT: 79

FM

Over: GRAND RIVER

073292407, Union, IA

Built 1988 Load: 23.2 t ADT: 60

FM

Over: FOUR MILE CREEK

073282402, Union, IA

Built 1950 Load: 24.2 t ADT: 20

IA 25

Over: STREAM

1.0 MI. N OF N JCT. US 34, Union, IA

Built 1976 Load: 24.9 t ADT: 4,870

FM

Over: NODAWAY RIVER

073311702, Union, IA

Built 1978 Load: 26.6 t ADT: 29

IA 25

Over: SUMMIT LAKE

2.6 MI. N OF N JCT. US 34, Union, IA

Built 1976 Load: 26.8 t ADT: 1,950

US 34

Over: TWELVE MILE CREEK

2.4 MI. W OF JCT. U.S.169, Union, IA

Built 1971 Load: 27.9 t ADT: 4,890

LOCAL

Over: SMALL STREAM

071310302, Union, IA

Built 1995 Load: 28.2 t ADT: 35

FM

Over: GRAND RIVER

071301301, Union, IA

Built 1979 Load: 28.5 t ADT: 89

FM

Over: MIDDLE PLATTE

071310102, Union, IA

Built 1975 Load: 29.9 t ADT: 927

FM

Over: E BR MIDDLE PLATTE RIVER

071311502, Union, IA

Built 1980 Load: 29.9 t ADT: 20

FM

Over: EAST PLATTE RIVER

071313402, Union, IA

Built 1983 Load: 29.9 t ADT: 15

FM

Over: PLATTE RIVER

072311501, Union, IA

Built 1979 Load: 29.9 t ADT: 757

US 34 & 169

Over: GRAND RIVER

1.2 mi. W of E Jct US 169, Union, IA

Built 1971 Load: 30.0 t ADT: 3,450

LOCAL

Over: W WOLFE CREEK

073282003, Union, IA

Built 1995 Load: 30.1 t ADT: 46

LOCAL

Over: PLATTE RIVER

071310301, Union, IA

Built 1979 Load: 30.2 t ADT: 15

FM

Over: THREE MILE CREEK

073300408, Union, IA

Built 1985 Load: 30.2 t ADT: 60

FM

Over: THREE MILE CREEK

072291304, Union, IA

Built 1976 Load: 30.6 t ADT: 71

LOCAL

Over: TWELVE MILE CREEK

072292001, Union, IA

Built 1977 Load: 30.6 t ADT: 103

WILLOW AVENUE

Over: GRAND RIVER

071281110, Union, IA

Built 1980 Load: 30.8 t ADT: 120

LOCAL

Over: STREAM

072292005, Union, IA

Built 1999 Load: 30.8 t ADT: 46

LOCAL

Over: SMALL STREAM

072303401, Union, IA

Built 1988 Load: 32.0 t ADT: 15

FM

Over: WOLF CREEK

073292403, Union, IA

Built 2001 Load: 32.2 t ADT: 100

LOCAL ROAD

Over: SMALL STREAM

071280404, Union, IA

Built 1978 Load: 32.7 t ADT: 15

FM

Over: SMALL STREAM

071310504, Union, IA

Built 1974 Load: 32.7 t ADT: 131

FM

Over: THREE MILE CREEK

072290404, Union, IA

Built 1969 Load: 32.7 t ADT: 450

FM

Over: CREEK

072303202, Union, IA

Built 1994 Load: 32.7 t ADT: 319

LOCAL

Over: SMALL STREAM

073311805, Union, IA

Built 1990 Load: 32.7 t ADT: 11

US 34

Over: FOUR MILE CREEK

2 MI. E OF E JCT. US 169, Union, IA

Built 1971 Load: 32.9 t ADT: 3,040

LOCAL

Over: SMALL STREAM

072280203, Union, IA

Built 1979 Load: 33.4 t ADT: 11

LOCAL

Over: STREAM

071290701, Union, IA

Built 1965 Load: 35.1 t ADT: 46

LOCAL

Over: SAND CREEK

071283203, Union, IA

Built 1984 Load: 35.6 t ADT: 21

US 34 & IA 25

Over: BRANCH PLATTE RIVER

1.0 MI. E OF W JCT IA 25, Union, IA

Built 1973 Load: 36.4 t ADT: 3,730

LOCAL

Over: PLATTE RIVER

071312301, Union, IA

Built 1986 Load: 36.5 t ADT: 72

FM

Over: EAST BRANCH PLATTE RIVER

072303003, Union, IA

Built 1979 Load: 37.3 t ADT: 89

LOCAL

Over: CREEK

072300301, Union, IA

Built 1952 Load: 37.6 t ADT: 11

LARK AVENUE

Over: SMALL STREAM

071301202, Union, IA

Built 2002 Load: 38.1 t ADT: 30

FM 160TH ST

Over: CREEK

072300503, Union, IA

Built 1952 Load: 38.5 t ADT: 150

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