Delaware County, IA

254 public highway bridges

Delaware County Bridge Snapshot

Delaware County, Iowa contains 254 public highway bridges in the FHWA National Bridge Inventory. Roughly 38.6% are rated “Good,” 51.6% “Fair,” 6.7% “Poor,” and 6.7% 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.

254
Total Bridges
38.6%
Good
6.7%
Poor
6.7%
Structurally Deficient

Condition Distribution

Good
38.6% (98)
Fair
51.6% (131)
Poor
6.7% (17)
SD
6.7% (17)

All Bridges (254)

W63 100TH AVE

Unknown

Over: U.S. 20

3.5 mi. E of Jct. IA 187, Delaware, IA

Built 1970 ADT: 6,500

S 3RD ST

Unknown

Over: US 20

1.2 MI. E OF JCT. IA 13, Delaware, IA

Built 1974 ADT: 7,700

FM D-5X

Unknown

Over: US 20

AT JCT. SR D5X, Delaware, IA

Built 1973 ADT: 6,800

US 20 EB

Unknown

Over: 205TH AVE SPRING BRANCH

2.8 MI. W OF JCT. IA 38, Delaware, IA

Built 1973 ADT: 150

US 20 WB

Unknown

Over: 205TH AVE SPRING BRANCH

2.8 MI. W OF JCT. IA 38, Delaware, IA

Built 1973 ADT: 150

220TH AVE

Unknown

Over: US 20

At jct. US 20, Delaware, IA

Built 1973 ADT: 8,600

IA 38

Unknown

Over: US 20

AT THE JCT. OF US 20, Delaware, IA

Built 1974 ADT: 7,500

X 35 (270TH AVE)

Unknown

Over: US 20

3.7 mi. E of Jct. IA #38, Delaware, IA

Built 1987 ADT: 8,100

FM 230TH AVE

Fair

Over: MAQUOKETA RIVER

088042902, Delaware, IA

Built 1934 ADT: 108

LOC FIREFLY RD

Fair

Over: STREAM

089051806, Delaware, IA

Built 1935 Load: 10.4 t ADT: 69

FM 230TH AVE

Fair

Over: BUCK CREEK

087041702, Delaware, IA

Built 1963 Load: 11.7 t ADT: 383

LOCAL OAK RD

Fair

Over: STREAM

090041603, Delaware, IA

Built 1965 Load: 14.3 t ADT: 59

LOC 270 AVE

Fair

Over: PENNS CREEK

088041204, Delaware, IA

Built 1983 Load: 15.2 t ADT: 49

140TH ST

Fair

Over: HONEY CREEK

090052701, Delaware, IA

Built 1925 Load: 15.6 t ADT: 30

LOCAL 120 AVE

Fair

Over: BUFFALO CREEK OVERFLOW

087062804, Delaware, IA

Built 2003 Load: 15.9 t ADT: 44

LOCAL 325 ST

Fair

Over: STREAM

087062503, Delaware, IA

Built 1975 Load: 16.3 t ADT: 26

LOCAL 330 ST

Fair

Over: SMALL STREAM

087063601, Delaware, IA

Built 1966 Load: 16.3 t ADT: 33

LOCAL 180TH AVE

Fair

Over: SMALL STREAM

087050402, Delaware, IA

Built 1945 Load: 17.0 t ADT: 97

FM 110TH AVE

Fair

Over: BUFFALO CREEK

087062002, Delaware, IA

Built 1977 Load: 17.0 t ADT: 403

FM 280 AVE

Fair

Over: SMALL STREAM

090031804, Delaware, IA

Built 1962 Load: 17.0 t ADT: 98

FM 300 AVE

Fair

Over: BEAR CREEK

090032102, Delaware, IA

Built 1960 Load: 17.0 t ADT: 462

BACKBONE ST PK

Fair

Over: MAQUOKETA RIVER

IN BACKBONE STATE PARK, Delaware, IA

Built 1976 Load: 18.2 t

NATURE RD

Fair

Over: ODELL BRANCH

090041706, Delaware, IA

Built 1939 Load: 18.8 t ADT: 59

LOC 122 ST

Fair

Over: LINDSEY CREEK

090051603, Delaware, IA

Built 1981 Load: 19.0 t ADT: 20

FM 300TH ST

Fair

Over: SMALL STREAM

087061701, Delaware, IA

Built 1978 Load: 19.4 t ADT: 324

FM SHERWOOD RD

Fair

Over: SMALL STREAM

88 03 17 03, Delaware, IA

Built 2011 Load: 19.4 t ADT: 39

BACKBONE ST PK

Fair

Over: STREAM

IN BACKBONE STATE PARK, Delaware, IA

Built 1934 Load: 19.6 t

300TH AVE

Fair

Over: STREAM

088 03 21 02, Delaware, IA

Built 2015 Load: 20.1 t ADT: 33

OAK RD

Fair

Over: O'DELL BRANCH

090041603, Delaware, IA

Built 1964 Load: 20.4 t ADT: 59

265TH ST

Fair

Over: STREAM

880328 5050, Delaware, IA

Built 2016 Load: 20.7 t ADT: 70

137TH ST

Fair

Over: SMALL STREAM

090042303, Delaware, IA

Built 1939 Load: 20.9 t ADT: 44

LOC 285 ST

Fair

Over: SMALL STREAM

087030509, Delaware, IA

Built 1966 Load: 21.7 t ADT: 29

LOCAL 210 AVE

Fair

Over: SMALL STREAM

087052502, Delaware, IA

Built 1965 Load: 21.7 t ADT: 11

FM 182ND ST

Fair

Over: SMALL STREAM

089031503, Delaware, IA

Built 1991 Load: 21.7 t ADT: 59

LOCAL 120 ST

Fair

Over: SMALL STREAM

090061301, Delaware, IA

Built 1971 Load: 21.7 t ADT: 88

FM 332 AVE

Fair

Over: BEAR CREEK

089032504, Delaware, IA

Built 1997 Load: 21.9 t ADT: 1,218

LOCAL 320 ST

Fair

Over: SMALL STREAM

087043001, Delaware, IA

Built 1993 Load: 22.0 t ADT: 26

250TH ST

Fair

Over: SMALL STREAM

088042203, Delaware, IA

Built 1991 Load: 22.0 t ADT: 70

FM 240 ST

Fair

Over: STREAM

088051801, Delaware, IA

Built 1965 Load: 22.0 t ADT: 69

FM 240 ST

Fair

Over: SMALL STREAM

088051803, Delaware, IA

Built 1965 Load: 22.0 t ADT: 79

LOCAL 255 ST

Fair

Over: SMALL STREAM

088051905, Delaware, IA

Built 1968 Load: 22.0 t ADT: 79

LOCAL 190 ST

Fair

Over: STREAM

089031901, Delaware, IA

Built 1969 Load: 22.0 t ADT: 29

LOCAL 280 AVE

Fair

Over: PLUM CREEK

089033002, Delaware, IA

Built 1974 Load: 22.0 t ADT: 39

FM - 180TH ST

Fair

Over: SMALL STREAM

089041305, Delaware, IA

Built 1976 Load: 22.0 t ADT: 44

LOC 160 ST

Fair

Over: SMALL STREAM

089060501, Delaware, IA

Built 1980 Load: 22.0 t ADT: 29

210TH AVE

Fair

Over: SMALL STREAM

090052404, Delaware, IA

Built 1978 Load: 22.0 t ADT: 44

170TH AVE

Fair

Over: SMALL STREAM

087050804, Delaware, IA

Built 1992 Load: 22.4 t ADT: 97

LOC 230TH ST

Fair

Over: STREAM

088030801, Delaware, IA

Built 1992 Load: 22.4 t ADT: 39

LOCAL 290 AVE

Fair

Over: SMALL STREAM

090032902, Delaware, IA

Built 1992 Load: 22.4 t ADT: 15

140TH ST

Fair

Over: STREAM

090053001, Delaware, IA

Built 1968 Load: 22.4 t ADT: 5

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