Hamilton County, IA

134 public highway bridges

Hamilton County Bridge Snapshot

Hamilton County, Iowa contains 134 public highway bridges in the FHWA National Bridge Inventory. Roughly 32.1% are rated “Good,” 31.3% “Fair,” 24.6% “Poor,” and 24.6% 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.

134
Total Bridges
32.1%
Good
24.6%
Poor
24.6%
Structurally Deficient

Condition Distribution

Good
32.1% (43)
Fair
31.3% (42)
Poor
24.6% (33)
SD
24.6% (33)

All Bridges (134)

SR D-65

Unknown

Over: I-35

AT JUNCTION WITH I-35, Hamilton, IA

Built 1965 ADT: 26,100

NB I-35

Unknown

Over: CO RD D-25

AT JUNCTION WITH SR D25, Hamilton, IA

Built 1974 ADT: 1,090

I 35 SB

Unknown

Over: SR D25

AT JUNCTION WITH SR D25, Hamilton, IA

Built 1974 ADT: 1,090

NB I-35

Unknown

Over: CC RR & 210TH ST

1.1 MI N OF SR D25, Hamilton, IA

Built 1972 ADT: 40

SR D-20

Unknown

Over: I-35

AT JUNCTION WITH D20, Hamilton, IA

Built 1972 ADT: 16,000

SB I-35

Unknown

Over: CC RR & 210TH ST

1.1 MILES NORTH OF SR D25, Hamilton, IA

Built 1972 ADT: 20

LOCKWOOD AVE

Unknown

Over: US 20

3.0 MILE E OF E JCT IA 17, Hamilton, IA

Built 1975 ADT: 10,100

EB US 20

Unknown

Over: R-38

AT JUNCTION WITH SR R38, Hamilton, IA

Built 1975 ADT: 235

WB US 20

Unknown

Over: R-38

AT JUNCTION WITH SR R38, Hamilton, IA

Built 1975 ADT: 235

POPLAR GROVE AVE

Unknown

Over: US 20

2.0 MILES W OF JCT US 69, Hamilton, IA

Built 1975 ADT: 10,300

IA 17

Unknown

Over: US 20

AT NORTH JCT WITH US 20, Hamilton, IA

Built 1978 ADT: 9,700

EB 20 & SB 17

Unknown

Over: R-27

0.8 MI W OF E JCT IA 17, Hamilton, IA

Built 1978 ADT: 475

WB 20 & NB 17

Unknown

Over: R-27

0.8 MI W OF E JCT IA 17, Hamilton, IA

Built 1978 ADT: 475

CO RD R 61

Unknown

Over: U.S. 20

0.5 MILE EAST OF JCT I-35, Hamilton, IA

Built 1990 ADT: 3,450

FM RD R 77

Unknown

Over: US 20

2.5 MILES E OF JCT I-35, Hamilton, IA

Built 1990 ADT: 8,700

ZIEGLER AVE

Unknown

Over: US 20

2.0 MILES EAST OF SR R77, Hamilton, IA

Built 1990 ADT: 8,900

LOCAL

Fair

Over: SKUNK RIVER

087242405, Hamilton, IA

Built 1952 Load: 13.2 t ADT: 90

LOCAL

Fair

Over: SKUNK RIVER

088233001, Hamilton, IA

Built 1949 Load: 17.1 t ADT: 15

LOCAL

Fair

Over: WHITE FOX CR

089251503, Hamilton, IA

Built 1955 Load: 18.6 t ADT: 40

LOCAL

Fair

Over: LONG DICK CR

086231601, Hamilton, IA

Built 1955 Load: 19.5 t ADT: 15

LOCAL

Fair

Over: LONG DICK CR

086232101, Hamilton, IA

Built 1955 Load: 19.5 t ADT: 26

LOCAL

Fair

Over: KEIGLEY CREEK

086243002, Hamilton, IA

Built 1955 Load: 19.5 t ADT: 20

LOCAL

Fair

Over: KEIGLEY CR

086243202, Hamilton, IA

Built 1954 Load: 19.5 t ADT: 15

FM

Fair

Over: SKUNK RIVER

087241201, Hamilton, IA

Built 1955 Load: 19.5 t ADT: 26

LOCAL

Fair

Over: SKUNK RIVER

087241202, Hamilton, IA

Built 1955 Load: 19.5 t ADT: 20

LOCAL

Fair

Over: SKUNK RIVER

087243606, Hamilton, IA

Built 1952 Load: 19.7 t ADT: 100

LOCAL

Fair

Over: DRAINAGE DITCH

089230902, Hamilton, IA

Built 1924 Load: 21.4 t ADT: 26

IA 17

Fair

Over: IOWAY CREEK

0.9 MILE S OF JCT SR D65, Hamilton, IA

Built 1979 Load: 21.7 t ADT: 2,260

US 20 & IA 17

Fair

Over: WATERWAY

2.1 MI E OF W JCT IA 17, Hamilton, IA

Built 1977 Load: 24.0 t ADT: 11,200

FM

Fair

Over: IOWAY CREEK

086262502, Hamilton, IA

Built 1924 Load: 25.0 t ADT: 20

WB US 20

Fair

Over: BOONE RIVER/REC TRAIL

1.2 MI E OF E JCT IA 17, Hamilton, IA

Built 1974 Load: 25.1 t ADT: 5,050

I 35

Fair

Over: DRAINAGE DITCH

0.8 MILE S OF JCT IA 175, Hamilton, IA

Built 1966 Load: 25.3 t ADT: 27,100

FM

Fair

Over: SKUNK RIVER

088243601, Hamilton, IA

Built 1962 Load: 26.3 t ADT: 270

EB US 20

Fair

Over: BOONE RIVER

1.2 MI E OF E JCT IA 17, Hamilton, IA

Built 1974 Load: 27.4 t ADT: 5,050

LOCAL

Fair

Over: DRAINAGE DITCH

089261306, Hamilton, IA

Built 1929 Load: 27.5 t ADT: 11

2ND ST

Fair

Over: BOONE RIVER

000000000, Hamilton, IA

Built 1950 Load: 27.7 t ADT: 3,797

FM

Fair

Over: DRAINAGE DITCH

088263102, Hamilton, IA

Built 1924 Load: 28.6 t ADT: 50

LOCAL

Fair

Over: WHITE FOX CR

089250303, Hamilton, IA

Built 1978 Load: 29.9 t ADT: 30

LOCAL

Fair

Over: CREEK

088251601, Hamilton, IA

Built 1926 Load: 32.6 t ADT: 20

KANTOR AVE

Fair

Over: LYONS CREEK

089253406, Hamilton, IA

Built 2003 Load: 32.7 t ADT: 270

FM

Fair

Over: BOONE RIVER

087263010, Hamilton, IA

Built 1939 Load: 32.9 t ADT: 478

LOCAL

Fair

Over: KEIGLEY CR

086243101, Hamilton, IA

Built 1977 Load: 33.0 t ADT: 15

LOCAL

Fair

Over: CROOKED CREEK

086251802, Hamilton, IA

Built 1970 Load: 33.0 t ADT: 15

LOCAL

Fair

Over: DRAINAGE DITCH

089231503, Hamilton, IA

Built 1970 Load: 33.0 t ADT: 26

LOCAL

Fair

Over: DRAINAGE DITCH

089231503, Hamilton, IA

Built 1970 Load: 33.0 t ADT: 26

IA 175

Fair

Over: DRAINAGE DITCH

0.2 MI. E OF E JCT. US 69, Hamilton, IA

Built 1977 Load: 33.4 t ADT: 1,690

FM

Fair

Over: BOONE RIVER

087261406, Hamilton, IA

Built 1973 Load: 34.3 t ADT: 429

FM

Fair

Over: BUCK CREEK

089252303, Hamilton, IA

Built 1975 Load: 37.2 t ADT: 240

LOCAL

Fair

Over: CREEK

088250906, Hamilton, IA

Built 1918 Load: 37.5 t ADT: 11

I-35

Fair

Over: TUTTLE CREEK

0.2 MILE N OF JCT US 20, Hamilton, IA

Built 1967 Load: 39.2 t ADT: 16,800

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