Palo Alto County, IA

114 public highway bridges

Palo Alto County Bridge Snapshot

Palo Alto County, Iowa contains 114 public highway bridges in the FHWA National Bridge Inventory. Roughly 23.7% are rated “Good,” 57% “Fair,” 19.3% “Poor,” and 19.3% 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.

114
Total Bridges
23.7%
Good
19.3%
Poor
19.3%
Structurally Deficient

Condition Distribution

Good
23.7% (27)
Fair
57% (65)
Poor
19.3% (22)
SD
19.3% (22)

All Bridges (114)

FM

Fair

Over: CYLINDER CREEK

095320103, Palo Alto, IA

Built 1975 Load: 33.0 t ADT: 131

LOCAL RD

Fair

Over: SMALL

095322302, Palo Alto, IA

Built 1979 Load: 33.0 t ADT: 21

LOCAL

Fair

Over: SILVER CREEK

095342308, Palo Alto, IA

Built 1978 Load: 33.0 t ADT: 50

FM

Fair

Over: DD

096321502, Palo Alto, IA

Built 1973 Load: 33.0 t ADT: 40

FM

Fair

Over: DD

096322202, Palo Alto, IA

Built 1977 Load: 33.0 t ADT: 45

FM

Fair

Over: DD #114

097332605, Palo Alto, IA

Built 1982 Load: 33.3 t ADT: 81

LOCAL

Fair

Over: DD 176

096333201, Palo Alto, IA

Built 2005 Load: 34.6 t ADT: 15

LOCAL

Fair

Over: JACK CREEK

097331104, Palo Alto, IA

Built 1986 Load: 34.9 t ADT: 73

LOCAL

Fair

Over: DD 80

096322602, Palo Alto, IA

Built 1992 Load: 36.3 t ADT: 21

LOCAL

Fair

Over: DD #22

094341902, Palo Alto, IA

Built 1982 Load: 36.7 t ADT: 11

LOCAL

Fair

Over: CYLINDER CREEK

096313101, Palo Alto, IA

Built 1991 Load: 37.1 t ADT: 81

LOCAL

Fair

Over: CYLINDER CREEK

097313302, Palo Alto, IA

Built 1999 Load: 39.0 t ADT: 21

530TH AVE

Fair

Over: CYLINDER CREEK

096310802, Palo Alto, IA

Built 1925 Load: 39.2 t ADT: 539

FM

Fair

Over: DD #114

096332601, Palo Alto, IA

Built 1973 Load: 44.4 t ADT: 275

FM

Fair

Over: WEST FORK DES MOINES R

097332705, Palo Alto, IA

Built 1983 Load: 48.3 t ADT: 71

FM

Good

Over: SILVER CREEK

095342306, Palo Alto, IA

Built 2002 Load: 27.3 t ADT: 769

LOCAL

Good

Over: DD 81

094312903, Palo Alto, IA

Built 1996 Load: 34.6 t ADT: 72

FM

Good

Over: DD 81

094311705, Palo Alto, IA

Built 1994 Load: 35.3 t ADT: 669

FM

Good

Over: DES MOINES RIVER

095312908, Palo Alto, IA

Built 1996 Load: 35.3 t ADT: 290

LOCAL

Good

Over: STREAM

094313302, Palo Alto, IA

Built 1989 Load: 37.1 t ADT: 11

LOCAL

Good

Over: CYLINDER CREEK

096311901, Palo Alto, IA

Built 1992 Load: 37.1 t ADT: 31

LOCAL

Good

Over: JACK CREEK

097320604, Palo Alto, IA

Built 1990 Load: 37.1 t ADT: 26

FM

Good

Over: OLD CHANNEL DES MOINES R

094311603, Palo Alto, IA

Built 1994 Load: 38.2 t ADT: 669

B63 (490TH ST)

Good

Over: DD 63

094332901, Palo Alto, IA

Built 2014 Load: 38.6 t ADT: 309

B55 430TH ST

Good

Over: DD #61

095312601, Palo Alto, IA

Built 2016 Load: 38.6 t ADT: 478

FM

Good

Over: DES MOINES RIVER

095312908, Palo Alto, IA

Built 1996 Load: 39.5 t ADT: 290

B63 490TH ST

Good

Over: DD84

094342601, Palo Alto, IA

Built 2021 Load: 40.2 t ADT: 309

FM

Good

Over: DES MOINES RIVER

094310803, Palo Alto, IA

Built 1988 Load: 41.1 t ADT: 46

500TH ST

Good

Over: STREAM

094313201, Palo Alto, IA

Built 2016 Load: 43.1 t ADT: 5

350TH ST

Good

Over: STREAM

096331501, Palo Alto, IA

Built 2016 Load: 43.1 t ADT: 26

LOCAL

Good

Over: PRAIRIE CREEK

094312403, Palo Alto, IA

Built 1990 Load: 45.4 t ADT: 73

FM

Good

Over: DD 84

094342302, Palo Alto, IA

Built 2002 Load: 45.4 t ADT: 1,008

FM

Good

Over: PRAIRIE CREEK

094311303, Palo Alto, IA

Built 2005 Load: 45.7 t ADT: 681

FM

Good

Over: DD #48

094322601, Palo Alto, IA

Built 2005 Load: 45.7 t ADT: 669

FM

Good

Over: DD 98

094323005, Palo Alto, IA

Built 2005 Load: 45.7 t ADT: 709

FM

Good

Over: DD 63

094330801, Palo Alto, IA

Built 1995 Load: 45.7 t ADT: 34

270 ST

Good

Over: DD 63

094331803, Palo Alto, IA

Built 2000 Load: 45.7 t ADT: 21

FM

Good

Over: DD 84

094342601, Palo Alto, IA

Built 2006 Load: 45.7 t ADT: 309

FM

Good

Over: DD 84

094342601, Palo Alto, IA

Built 2006 Load: 45.7 t ADT: 309

LOCAL

Good

Over: DD 61

095312301, Palo Alto, IA

Built 1997 Load: 45.7 t ADT: 15

LOCAL

Good

Over: STREAM

095322806, Palo Alto, IA

Built 1998 Load: 45.7 t ADT: 11

FM

Good

Over: SILVER CREEK

095342401, Palo Alto, IA

Built 2006 Load: 45.7 t ADT: 538

LOCAL

Poor

Over: STREAM

096331002, Palo Alto, IA

Built 1915 Load: 7.8 t ADT: 5

FM

Poor

Over: OLD CHANNEL DES MOINES R

094310803, Palo Alto, IA

Built 1956 Load: 9.1 t ADT: 46

LOCAL

Poor

Over: DD 80

095321203, Palo Alto, IA

Built 1959 Load: 9.3 t ADT: 50

LOCAL

Poor

Over: DD6

095340901, Palo Alto, IA

Built 1917 Load: 11.2 t ADT: 11

LOCAL

Poor

Over: LIZARD CREEK

094342502, Palo Alto, IA

Built 1921 Load: 14.7 t ADT: 21

LOCAL

Poor

Over: STREAM

096310701, Palo Alto, IA

Built 1965 Load: 17.1 t ADT: 26

LOCAL

Poor

Over: DD 98

094331401, Palo Alto, IA

Built 1972 Load: 18.0 t ADT: 21

LOCAL

Poor

Over: STREAM

094313601, Palo Alto, IA

Built 1927 Load: 18.9 t ADT: 90

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