Harrison County, IA

162 public highway bridges

Harrison County Bridge Snapshot

Harrison County, Iowa contains 162 public highway bridges in the FHWA National Bridge Inventory. Roughly 19.8% are rated “Good,” 54.3% “Fair,” 25.3% “Poor,” and 25.3% 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.

162
Total Bridges
19.8%
Good
25.3%
Poor
25.3%
Structurally Deficient

Condition Distribution

Good
19.8% (32)
Fair
54.3% (88)
Poor
25.3% (41)
SD
25.3% (41)

All Bridges (162)

LOCAL RD

Unknown

Over: I-29

1.0 MI. N OF JCT. US 30, Harrison, IA

Built 1966 ADT: 16,100

OSAGE TRAIL

Fair

Over: WILLOW RIVER

081422907, Harrison, IA

Built 1977 Load: 8.6 t ADT: 5

MALDEN TRAIL

Fair

Over: ALLEN CREEK

080430404, Harrison, IA

Built 1940 Load: 9.5 t ADT: 40

220TH ST

Fair

Over: ALLEN CREEK

079440301, Harrison, IA

Built 1940 Load: 11.6 t ADT: 11

FM - 335TH ST

Fair

Over: MOSQUITO CREEK

078413203, Harrison, IA

Built 1920 Load: 12.0 t ADT: 120

FM - 335TH ST

Fair

Over: SMALL STREAM

078413601, Harrison, IA

Built 1952 Load: 12.3 t ADT: 40

140TH ST

Fair

Over: ALLEN CREEK

081432601, Harrison, IA

Built 1973 Load: 13.8 t ADT: 15

FM & 110TH ST

Fair

Over: WILLOW RIVER

081421601, Harrison, IA

Built 1918 Load: 14.1 t ADT: 29

NORWOOD AVE

Fair

Over: HONEY CREEK

078433306, Harrison, IA

Built 1900 Load: 14.6 t ADT: 5

YATES AVE

Fair

Over: SMALL STREAM

078413602, Harrison, IA

Built 1960 Load: 15.0 t ADT: 20

170TH LANE

Fair

Over: ALLEN CREEK

080430507, Harrison, IA

Built 1969 Load: 17.1 t ADT: 11

HILLSIDE AVE

Fair

Over: STEER CREEK

080441106, Harrison, IA

Built 1963 Load: 17.1 t ADT: 40

US 30

Fair

Over: STREAM

2.4 mi. E of SR F-32, Harrison, IA

Built 1924 Load: 17.5 t ADT: 3,090

RUBY TRAIL

Fair

Over: SIX MILE CREEK

079421210, Harrison, IA

Built 1945 Load: 17.6 t ADT: 26

FM NEWARK AVE

Fair

Over: ALLEN CREEK

081431302, Harrison, IA

Built 1960 Load: 17.9 t ADT: 5

IA 127

Fair

Over: LITTLE BLOOMER CREEK

2.7 mi. E of E jct IA 183, Harrison, IA

Built 1940 Load: 18.1 t ADT: 460

FM - 335TH ST

Fair

Over: KEG CREEK

078413501, Harrison, IA

Built 1955 Load: 20.0 t ADT: 50

FM & 270TH ST

Fair

Over: PIGEON CREEK

079413301, Harrison, IA

Built 1951 Load: 20.3 t ADT: 20

LOC-SPOKANE AVE

Fair

Over: PICAYUNE CREEK

080410512, Harrison, IA

Built 1979 Load: 21.2 t ADT: 11

FM & 155TH ST

Fair

Over: MUD CREEK

081423605, Harrison, IA

Built 1940 Load: 21.4 t ADT: 79

LOCAL VIENNA AV

Fair

Over: SPRING CREEK

079412402, Harrison, IA

Built 1960 Load: 21.9 t ADT: 29

YALE AVE

Fair

Over: KEG CREEK

078411302, Harrison, IA

Built 1940 Load: 23.0 t ADT: 29

US 30

Fair

Over: ALLEN CREEK

0.9 MI. W OF JCT.29, Harrison, IA

Built 1966 Load: 23.3 t ADT: 6,500

NB I-29

Fair

Over: BURCHAM CREEK

2.7 MI. S OF JCT 127, Harrison, IA

Built 1967 Load: 23.3 t ADT: 7,600

FM OVERTON AVE

Fair

Over: HARRIS GROVE CREEK

078430308, Harrison, IA

Built 1963 Load: 24.3 t ADT: 788

FM 335TH ST

Fair

Over: BOYER RIVER

078442301, Harrison, IA

Built 1959 Load: 24.8 t ADT: 788

FM 110 ST

Fair

Over: BOYER RIVER

081410303, Harrison, IA

Built 1984 Load: 24.9 t ADT: 199

FM - 305TH ST

Fair

Over: MOSQUITO CREEK

078411603, Harrison, IA

Built 1978 Load: 25.1 t ADT: 34

FM 296TH ST

Fair

Over: PIGEON CREEK

078421101, Harrison, IA

Built 1962 Load: 25.1 t ADT: 270

SEWARD AVE

Fair

Over: PIGEON CREEK

078423304, Harrison, IA

Built 1979 Load: 25.1 t ADT: 60

FM & 194TH ST

Fair

Over: WILLOW RIVER

080432303, Harrison, IA

Built 1968 Load: 25.8 t ADT: 100

305TH ST

Fair

Over: ALLEN CREEK

078441701, Harrison, IA

Built 1974 Load: 25.9 t ADT: 139

SB I-29

Fair

Over: BURCHAM CREEK

2.8 MI. S OF JCT. 127, Harrison, IA

Built 1967 Load: 26.0 t ADT: 7,600

NB I-29

Fair

Over: DRAINAGE DITCH

1.8 MI. N OF JCT.127, Harrison, IA

Built 1967 Load: 26.0 t ADT: 7,300

SB I-29

Fair

Over: DRAINAGE DITCH

1.8 MI. N OF JCT.127, Harrison, IA

Built 1967 Load: 26.0 t ADT: 7,300

FM & 170TH ST

Fair

Over: E.PICAYUNE CREEK

080410305, Harrison, IA

Built 1978 Load: 26.1 t ADT: 15

SB I-29

Fair

Over: DRAINAGE DITCH

1.6 Mi. N of Jct. SR F-20, Harrison, IA

Built 1966 Load: 26.2 t ADT: 7,250

NB I-29

Fair

Over: LITTLE SIOUX RIVER

0.4 MI. N OF JCT. SR F-20, Harrison, IA

Built 1967 Load: 26.5 t ADT: 7,250

SB I-29

Fair

Over: LITTLE SIOUX RIVER

0.4 MI. N OF JCT. SR F-20, Harrison, IA

Built 1967 Load: 26.5 t ADT: 7,250

SB I-29

Fair

Over: BURCHAM CREEK

1.2 MI. S OF JCT. IA 127, Harrison, IA

Built 1967 Load: 26.9 t ADT: 7,600

270TH ST

Fair

Over: SPRING CREEK

079413501, Harrison, IA

Built 1951 Load: 26.9 t ADT: 20

FM & PANORA AVE

Fair

Over: WILLOW RIVER

081422905, Harrison, IA

Built 1972 Load: 27.1 t ADT: 100

260TH ST

Fair

Over: WILLOW CREEK

079433007, Harrison, IA

Built 1966 Load: 27.3 t ADT: 417

FM & 220TH ST

Fair

Over: PIGEON CREEK

079410101, Harrison, IA

Built 1952 Load: 27.6 t ADT: 26

FM 130TH ST

Fair

Over: ALLEN CREEK

081432303, Harrison, IA

Built 1950 Load: 28.0 t ADT: 15

FM & TOLEDO AVE

Fair

Over: PICAYUNE CREEK

080410304, Harrison, IA

Built 1977 Load: 28.6 t ADT: 60

FM TOLEDO AVE

Fair

Over: MILL CREEK

081412206, Harrison, IA

Built 1977 Load: 30.2 t ADT: 139

296TH ST

Fair

Over: BOYER RIVER

078441203, Harrison, IA

Built 1974 Load: 30.4 t ADT: 577

FM GORDON AVE

Fair

Over: SOLDIER RIVER

080440404, Harrison, IA

Built 1974 Load: 30.4 t ADT: 60

US 30

Fair

Over: BOYER RIVER

3.7 mi. W of jct. IA 37, Harrison, IA

Built 1968 Load: 31.7 t ADT: 3,090

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