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)

180TH ST

Good

Over: PICAYUNE CREEK

080421305, Harrison, IA

Built 1981 Load: 33.3 t ADT: 79

FM GENEVA PLACE

Good

Over: SOLDIER RIVER

081442705, Harrison, IA

Built 1980 Load: 34.1 t ADT: 50

180TH STREET

Good

Over: BOYER RIVER

080421203, Harrison, IA

Built 2002 Load: 34.6 t ADT: 79

QUINCY TRAIL

Good

Over: BOYER RIVER

080422805, Harrison, IA

Built 1994 Load: 34.6 t ADT: 15

242 TRAIL

Good

Over: WILLOW CREEK

079431503, Harrison, IA

Built 1986 Load: 35.1 t ADT: 60

280TH ST

Good

Over: WILLOW RIVER

078440401, Harrison, IA

Built 2021 Load: 36.3 t ADT: 60

235TH TRAIL

Good

Over: WILLOW CREEK

079431003, Harrison, IA

Built 2006 Load: 36.6 t ADT: 29

FM-335TH ST

Good

Over: PIGEON CREEK

078423401, Harrison, IA

Built 1991 Load: 37.2 t ADT: 79

LOC VIENNA AVE

Good

Over: PICAYUNE CREEK

080411204, Harrison, IA

Built 2006 Load: 37.2 t ADT: 26

280TH STREET

Good

Over: ALLEN CREEK

078440501, Harrison, IA

Built 2020 Load: 37.3 t ADT: 45

BUS BROWN DR

Good

Over: DRAINAGE

East of Lincolnway, Harrison, IA

Built 2017 Load: 37.6 t ADT: 1,225

FM & 340TH ST

Good

Over: WILLOW RIVER

081420301, Harrison, IA

Built 2005 Load: 37.6 t ADT: 50

FM-335TH ST

Good

Over: POTATO CREEK

078423101, Harrison, IA

Built 1993 Load: 38.2 t ADT: 100

F58 296TH ST

Good

Over: MOSQUITO CREEK

025500525, Harrison, IA

Built 2016 Load: 40.1 t ADT: 121

155TH ST

Good

Over: BOYER RIVER

081413107, Harrison, IA

Built 2018 Load: 43.1 t ADT: 40

E KELLY AVE

Good

Over: SOLDIER RIVER

080440706, Harrison, IA

Built 2013 Load: 44.7 t ADT: 60

F50 270TH ST

Good

Over: ALLEN CREEK

079443501, Harrison, IA

Built 2021 Load: 48.0 t ADT: 379

HARVARD TRAIL

Good

Over: ALLEN CREEK

080433006, Harrison, IA

Built 2008 Load: 52.6 t ADT: 34

315TH ST

Good

Over: KEG CREEK

078412301, Harrison, IA

Built 1999 Load: 58.0 t ADT: 20

SPOKANE AVE

Good

Over: MILL CREEK

081412104, Harrison, IA

Built 2003 Load: 58.0 t ADT: 45

IA 44

Good

Over: BRANCH SIX MILE CREEK

4.3 MI. E OF JCT. US 30, Harrison, IA

Built 1978 Load: 99.9 t ADT: 800

315TH ST

Poor

Over: MOSQUITO CREEK

078412003, Harrison, IA

Built 1930 Load: 9.1 t ADT: 20

LOC 128 TRAIL

Poor

Over: BOYER RIVER

081411705, Harrison, IA

Built 1940 Load: 9.4 t ADT: 89

JASPER TRAIL

Poor

Over: SMALL CREEK

079441103, Harrison, IA

Built 1900 Load: 10.8 t ADT: 50

180TH ST

Poor

Over: WILLOW CREEK

080431405, Harrison, IA

Built 1975 Load: 12.3 t ADT: 15

280TH ST

Poor

Over: MOSQUITO CREEK

078410301, Harrison, IA

Built 1940 Load: 12.9 t ADT: 20

LOCAL 120TH ST

Poor

Over: LITTLE SIOUX RIVER

081440703, Harrison, IA

Built 1971 Load: 13.1 t ADT: 40

288TH ST

Poor

Over: MOSQUITO CREEK

078410409, Harrison, IA

Built 1940 Load: 13.2 t ADT: 34

TAYLOR AVE

Poor

Over: PIGEON CREEK

078420102, Harrison, IA

Built 1920 Load: 13.2 t ADT: 40

240TH STREET

Poor

Over: PIGEON CREEK

079411403, Harrison, IA

Built 1967 Load: 13.3 t ADT: 15

325TH ST

Poor

Over: PIGEON CREEK

078422703, Harrison, IA

Built 1960 Load: 13.5 t ADT: 11

FM & NASH TRAIL

Poor

Over: ALLEN CREEK

081432604, Harrison, IA

Built 1976 Load: 13.9 t ADT: 20

LOC 335TH ST

Poor

Over: ALLEN CREEK

078443203, Harrison, IA

Built 1959 Load: 14.1 t ADT: 20

MOBILE AVE

Poor

Over: ALLEN CREEK

081433402, Harrison, IA

Built 1957 Load: 14.6 t ADT: 11

LOC 215TH ST

Poor

Over: PIGEON CREEK

080413603, Harrison, IA

Built 1955 Load: 14.8 t ADT: 26

VIENNA AVE

Poor

Over: PIGEON CREEK

079410102, Harrison, IA

Built 1967 Load: 15.0 t ADT: 60

LOC 210TH ST

Poor

Over: LITTLE PIGEON

080413501, Harrison, IA

Built 1930 Load: 16.1 t ADT: 11

198TH ST

Poor

Over: SMALL CREEK

080422211, Harrison, IA

Built 1950 Load: 18.0 t ADT: 79

FM EASTON TRAIL

Poor

Over: ALLEN CREEK

081433403, Harrison, IA

Built 1969 Load: 20.9 t ADT: 335

FM LAREDO AVE

Poor

Over: ALLEN CREEK

080431706, Harrison, IA

Built 1942 Load: 21.5 t ADT: 139

NILES TRAIL

Poor

Over: HARRIS GROVE CREEK

079433603, Harrison, IA

Built 1975 Load: 22.9 t ADT: 29

FM - 335TH ST

Poor

Over: SMALL CREEK

078413503, Harrison, IA

Built 1952 Load: 26.1 t ADT: 71

TOLEDO AVE

Poor

Over: PIGEON CREEK

079412702, Harrison, IA

Built 1951 Load: 27.8 t ADT: 34

305TH ST

Poor

Over: KEG CREEK

078411301, Harrison, IA

Built 1957 Load: 32.7 t ADT: 20

L23 LAREDO AVE

Poor

Over: STEER CREEK

.75 MI S of 147th on L23, Harrison, IA

Built 1942 Load: 32.7 t ADT: 139

242ND TRAIL

Poor

Over: DRAINAGE DITCH

079431605, Harrison, IA

Built 2013 Load: 44.5 t ADT: 34

8TH STREET

Structurally Deficient

Over: BOYER RIVER

000000000, Harrison, IA

Built 1900 ADT: 123

NEELY TRAIL

Structurally Deficient

Over: WILLOW CREEK

080432707, Harrison, IA

Built 1940 ADT: 45

MEDFORD AVE

Structurally Deficient

Over: WILLOW RIVER

079432102, Harrison, IA

Built 1900 Load: 4.3 t ADT: 89

155TH ST

Structurally Deficient

Over: WILLOW RIVER

081423203, Harrison, IA

Built 1930 Load: 5.4 t ADT: 11

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