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:

LOCAL - 760TH

Over: CREEK

076342602, Cass, IA

Built 1983 Load: 25.7 t ADT: 5

LOCAL - HAMBURG

Over: CREEK

076350203, Cass, IA

Built 1988 Load: 25.7 t ADT: 35

LOCAL - HAMPTON

Over: SMALL STREAM

076350707, Cass, IA

Built 1986 Load: 25.7 t ADT: 26

FM - 610TH

Over: TURKEY CREEK

076363204, Cass, IA

Built 1973 Load: 25.7 t ADT: 50

LOCAL - CHICAGO

Over: WATERWAY

077341403, Cass, IA

Built 1985 Load: 25.7 t ADT: 11

FM - 730TH ST

Over: WATERWAY

074340502, Cass, IA

Built 1969 Load: 25.9 t ADT: 79

FM - 610TH

Over: WATERWAY

075362902, Cass, IA

Built 1969 Load: 26.3 t ADT: 15

LOCAL - 540TH

Over: WATERWAY

074370706, Cass, IA

Built 1977 Load: 26.6 t ADT: 50

US 6

Over: TURKEY CREEK

3.7 MI. E OF JCT. IA #48, Cass, IA

Built 1959 Load: 27.1 t ADT: 1,960

FM

Over: WATERWAY

076342201, Cass, IA

Built 1900 Load: 27.1 t ADT: 60

FM - HIGHLAND

Over: BUCK CREEK

076360701, Cass, IA

Built 1983 Load: 29.7 t ADT: 89

LOCAL/NEWPORT

Over: SEVEN MILE CREEK

075351101, Cass, IA

Built 1977 Load: 30.4 t ADT: 26

LOCAL - QUINCY

Over: SEVENMILE CREEK

075352901, Cass, IA

Built 1977 Load: 30.4 t ADT: 30

LOCAL/RICHLAND

Over: SMALL STREAM

075363201, Cass, IA

Built 1974 Load: 30.4 t ADT: 41

LOCAL - 725TH

Over: TURKEY CREEK

077343104, Cass, IA

Built 1973 Load: 30.4 t ADT: 30

FM - BOSTON

Over: BUCK CREEK

077360701, Cass, IA

Built 1974 Load: 30.4 t ADT: 26

LOCAL - TUCSON

Over: WEST NODAWAY RIVER

074340701, Cass, IA

Built 1972 Load: 30.6 t ADT: 35

LOCAL - 720TH

Over: SEVEN MILE CREEK

075340602, Cass, IA

Built 1978 Load: 30.6 t ADT: 30

FM - BOSTON

Over: TROUBLESOME RIVER

077351003, Cass, IA

Built 1977 Load: 31.8 t ADT: 45

LOCAL - 540TH

Over: WATERWAY

074370606, Cass, IA

Built 1991 Load: 32.7 t ADT: 72

LOCAL - QUINCY

Over: STREAM

075342801, Cass, IA

Built 2002 Load: 32.7 t ADT: 30

LOCAL - 720TH

Over: CREEK

076341804, Cass, IA

Built 1997 Load: 32.7 t ADT: 15

LOCAL/658TH LN

Over: CREEK

077360104, Cass, IA

Built 1997 Load: 32.7 t ADT: 15

FM - 690TH

Over: WATERWAY

076351502, Cass, IA

Built 1970 Load: 33.0 t ADT: 450

FM - INDIAN CRK

Over: TRIB INDIAN CREEK

076371904, Cass, IA

Built 1987 Load: 34.1 t ADT: 45

LOCAL - 570TH

Over: CAMP CREEK

077370302, Cass, IA

Built 1988 Load: 35.7 t ADT: 15

FM - YANKTON

Over: CLARKS BRANCH

074373203, Cass, IA

Built 1990 Load: 36.3 t ADT: 60

LOCAL - 720TH

Over: W NODAWAY RIVER

074340702, Cass, IA

Built 1988 Load: 38.2 t ADT: 11

IA 83

Over: CAMP CREEK

0.2 MI W OF Jct. SR M-56, Cass, IA

Built 1991 Load: 38.3 t ADT: 760

PELLA RD

Over: WEST NODAWAY CREEK

075342401, Cass, IA

Built 2016 Load: 38.6 t ADT: 15

LOCAL - 680TH

Over: WATERWAY

074352804, Cass, IA

Built 1985 Load: 39.8 t ADT: 5

OMAHA RD

Over: WEST NODAWAY CREEK

075341303, Cass, IA

Built 2000 Load: 40.7 t ADT: 5

FM - 570TH

Over: SPRING CREEK

076373402, Cass, IA

Built 1980 Load: 42.0 t ADT: 120

IA 83

Over: INDIAN CREEK

1.3 MI. W OF S.R. M56, Cass, IA

Built 1991 Load: 46.5 t ADT: 760

LOCAL

Over: BUCK CREEK

076370107, Cass, IA

Built 2005 Load: 52.9 t ADT: 537

IA 148

Over: SEVEN MILE CREEK

0.9 MI. S OF SR G-35, Cass, IA

Built 1994 Load: 53.3 t ADT: 790

US 71

Over: FOUR MILE CREEK

2.1 MI. N OF N JCT. 92, Cass, IA

Built 1971 Load: 59.5 t ADT: 2,280

LOCAL - WICHITA

Over: SMALL

074362801, Cass, IA

Built 1976 Load: 64.0 t ADT: 62

IA 48

Over: CLARKS BRANCH

1.9 MI. N OF SR H14, Cass, IA

Built 1974 Load: 90.5 t ADT: 1,090

IA 148

Over: STREAM

2.2 mi. S of Jct. SR G-61, Cass, IA

Built 1959 Load: 90.5 t ADT: 770

KINGBIRD AVE

Over: WATERWAY

077350303, Cass, IA

Built 2000 Load: 14.3 t ADT: 30

LOCAL

Over: CREEK

076351604, Cass, IA

Built 2004 Load: 15.4 t ADT: 5

740TH ST

Over: SEVEN MILE CREEK

076343302, Cass, IA

Built 2015 Load: 20.0 t ADT: 26

700TH ST

Over: JIM BRANCH OF TURKEY CR

076352602, Cass, IA

Built 2021 Load: 20.1 t ADT: 11

JASPER RD

Over: SPRING CREEK

076372201, Cass, IA

Built 2011 Load: 22.7 t ADT: 15

FM - 660TH

Over: SEVEN MILE CREEK

075353102, Cass, IA

Built 1979 Load: 25.3 t ADT: 89

US 71

Over: LONE TREE CREEK

0.1 mi. S of Jct. SR G35, Cass, IA

Built 1971 Load: 29.3 t ADT: 2,830

IA 48

Over: DRAINAGE DITCH

0.8 mi. N of Jct. IA #92, Cass, IA

Built 1985 Load: 30.1 t ADT: 1,490

US 71

Over: TURKEY CREEK

0.1 MI. N OF SR G-35, Cass, IA

Built 1971 Load: 30.9 t ADT: 2,830

IA 148

Over: WEST NODAWAY RIVER

0.9 mi. S of jct. 92, Cass, IA

Built 2016 Load: 32.4 t ADT: 770

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