Cass County, IA

237 public highway bridges

Cass County Bridge Snapshot

Cass County, Iowa contains 237 public highway bridges in the FHWA National Bridge Inventory. Roughly 22.4% are rated “Good,” 36.3% “Fair,” 39.7% “Poor,” and 39.7% 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.

237

Total Bridges

22.4%

Good

39.7%

Poor

39.7%

Structurally Deficient

Condition Distribution

Good

22.4% (53)

Fair

36.3% (86)

Poor

39.7% (94)

SD

39.7% (94)

All Bridges (237)

Sort:

I 80 EB

Over: US 71 & BIKE TRAIL

AT JCT. U.S. 71, Cass, IA

Built 2009 ADT: 1,355

EB I-80

Over: SR N-28

AT JCT. SR N-28, Cass, IA

Built 1959 ADT: 95

740TH ST

Over: I-80

1.0 MI. W OF IA 148, Cass, IA

Built 1958 ADT: 22,500

EB I-80

Over: 770TH STREET

1.7 MI. E OF IA 148, Cass, IA

Built 1958 ADT: 8

IA 83

Over: COMPTON CREEK

0.1 mi. W of jct. SR M56, Cass, IA

Built 1936 ADT: 760

LOCAL - CR CRK

Over: CROOKED CREEK

077351204, Cass, IA

Built 1977 Load: 9.0 t ADT: 11

LOCAL - 640TH

Over: CREEK

075363502, Cass, IA

Built 1900 Load: 9.1 t ADT: 30

LOCAL - 650TH

Over: W NODAWAY RIVER

074363604, Cass, IA

Built 1973 Load: 12.5 t ADT: 50

FM - DALLAS

Over: TROUBLESOME RIVER

077352101, Cass, IA

Built 1959 Load: 14.8 t ADT: 20

COLD SPR ST PK

Over: STREAM

1.9 mi. S of US 6 on M-56, Cass, IA

Built 1900 Load: 15.3 t

LOCAL - YORK

Over: THREE MILE CREEK

074363503, Cass, IA

Built 1982 Load: 16.8 t ADT: 72

LOCAL - 680TH

Over: CREEK

075352804, Cass, IA

Built 1981 Load: 16.8 t ADT: 11

FM - 710TH

Over: WATERWAY

075350102, Cass, IA

Built 1900 Load: 17.1 t ADT: 15

FM - HIGHLAND

Over: EAST NISHNABOTNA

076360621, Cass, IA

Built 1959 Load: 17.4 t ADT: 329

FM - 710TH

Over: WATERWAY

077353604, Cass, IA

Built 1966 Load: 17.8 t ADT: 71

540TH ST

Over: STREAM

074370706, Cass, IA

Built 1984 Load: 19.0 t ADT: 50

LOCAL/RICHLAND

Over: SMALL

075373201, Cass, IA

Built 2008 Load: 19.0 t ADT: 26

NISHNA ST

Over: SMALL CREEK

000000000, Cass, IA

Built 1983 Load: 20.1 t ADT: 101

LOCAL - FAYETTE

Over: INDIAN CREEK

077373203, Cass, IA

Built 1974 Load: 20.2 t ADT: 26

LOCAL - UPLAND

Over: THREEMILE CREEK

074361303, Cass, IA

Built 1996 Load: 20.5 t ADT: 15

LOCAL - 765TH

Over: WEST NODAWAY CREEK

075342402, Cass, IA

Built 1976 Load: 21.2 t ADT: 15

LOCAL - 740TH

Over: STALE BRANCH

074343302, Cass, IA

Built 1948 Load: 21.6 t ADT: 5

LOCAL ROAD

Over: WATERWAY

075342302, Cass, IA

Built 1990 Load: 21.6 t ADT: 15

LOCAL/VICTORIA

Over: THREE MILE CREEK

074362303, Cass, IA

Built 1976 Load: 22.1 t ADT: 41

LOCAL - 740TH

Over: CROOKED CREEK

077340402, Cass, IA

Built 1984 Load: 22.3 t ADT: 145

INDEPENDENCE RD

Over: CREEK

076371501, Cass, IA

Built 2005 Load: 22.5 t ADT: 5

LOCAL - 740TH

Over: ELM CREEK

074341602, Cass, IA

Built 1984 Load: 22.7 t ADT: 62

LOCAL - WICHITA

Over: SMALL CREEK

074342701, Cass, IA

Built 1986 Load: 22.7 t ADT: 15

LOCAL - UPLAND

Over: SMALL STREAM

074371501, Cass, IA

Built 1986 Load: 22.7 t ADT: 11

700TH ST

Over: CREEK

075351104, Cass, IA

Built 2014 Load: 22.7 t ADT: 5

LOCAL - 570TH

Over: WATERWAY

075373402, Cass, IA

Built 1988 Load: 22.7 t ADT: 15

LOCAL

Over: SEVENMILE CREEK

076341501, Cass, IA

Built 2006 Load: 22.7 t ADT: 51

700TH ST

Over: CREEK

076351404, Cass, IA

Built 2020 Load: 22.7 t ADT: 11

LOCAL - CHICAGO

Over: CREEK

077361701, Cass, IA

Built 1987 Load: 22.7 t ADT: 26

LOCAL/BUCK CRK

Over: CREEK

077361702, Cass, IA

Built 1988 Load: 22.7 t ADT: 30

LOCAL - EAGLE

Over: BUCK CREEK

077360502, Cass, IA

Built 1997 Load: 23.2 t ADT: 62

FM - 570TH

Over: IAIS RR

076370304, Cass, IA

Built 1952 Load: 23.3 t ADT: 79

LOCAL - 760TH

Over: STALE BRANCH

074342302, Cass, IA

Built 1986 Load: 23.5 t ADT: 11

LOCAL - 670TH

Over: LONE TREE BRANCH

075350502, Cass, IA

Built 1978 Load: 24.5 t ADT: 21

LOCAL - JASPER

Over: CREEK

076362203, Cass, IA

Built 1984 Load: 24.5 t ADT: 91

LOCAL - 100TH

Over: CAMP CREEK

077370301, Cass, IA

Built 1964 Load: 24.5 t ADT: 5

LOCAL - CHICAGO

Over: CREEK

077371401, Cass, IA

Built 1988 Load: 24.5 t ADT: 15

545TH ST

Over: CLARKS BRANCH

074373104, Cass, IA

Built 2016 Load: 24.7 t ADT: 11

FM - YANKTON

Over: THREE MILE CREEK

074363401, Cass, IA

Built 1977 Load: 24.9 t ADT: 34

FM - BOSTON

Over: INDIAN CREEK

077370701, Cass, IA

Built 1974 Load: 24.9 t ADT: 60

FM - BOSTON

Over: CAMP CREEK

077370901, Cass, IA

Built 1976 Load: 24.9 t ADT: 45

LOCAL - 670TH

Over: SEVEN MILE CREEK

075353202, Cass, IA

Built 1978 Load: 25.3 t ADT: 15

FM - SEATTLE

Over: SEVEN MILE CREEK

074360503, Cass, IA

Built 1968 Load: 25.7 t ADT: 71

FM - YANKTON

Over: SEVEN MILE CREEK

074363105, Cass, IA

Built 1974 Load: 25.7 t ADT: 15

LOCAL - HAMBURG

Over: CREEK

076341003, Cass, IA

Built 1983 Load: 25.7 t ADT: 41

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 6, 2026