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)

Sort:

EB US 20

Over: MAQUOKETA RIVER

1.7 mi. E of Jct. IA 13, Delaware, IA

Built 1974 Load: 30.9 t ADT: 3,850

WB US 20

Over: MAQUOKETA RIVER

1.7 mi. E of Jct. IA 13, Delaware, IA

Built 1973 Load: 31.3 t ADT: 3,850

LOC 302 ST

Over: SMALL STREAM

087031403, Delaware, IA

Built 1984 Load: 31.8 t ADT: 49

335TH ST

Over: SMALL STREAM

087043203, Delaware, IA

Built 1988 Load: 31.8 t ADT: 15

LOCAL DOVE RD

Over: STREAM

089060202, Delaware, IA

Built 1990 Load: 31.8 t ADT: 39

LOCAL 185 ST

Over: PLUM CREEK

089041603, Delaware, IA

Built 1986 Load: 32.4 t ADT: 20

LOCAL 320 AVE

Over: COOKSLEY CREEK

088031402, Delaware, IA

Built 1989 Load: 32.7 t ADT: 30

FM 195 ST

Over: HONEY CREEK

089052005, Delaware, IA

Built 1980 Load: 32.7 t ADT: 835

BACKBONE ST PK

Over: STREAM

IN BACKBONE STATE PARK, Delaware, IA

Built 1935 Load: 32.7 t

BACKBONE STATE PK

Over: BR MAQUOKETA RIVER

IN BACKBONE STATE PARK, Delaware, IA

Built 1976 Load: 33.5 t

LOCAL 240 ST

Over: SAND CREEK

088061401, Delaware, IA

Built 1985 Load: 34.3 t ADT: 88

FM 210TH AVE

Over: SMALL STREAM

089052502, Delaware, IA

Built 1984 Load: 34.3 t ADT: 29

LOC 200TH ST

Over: SPRING BRANCH

089062901, Delaware, IA

Built 1989 Load: 34.3 t ADT: 33

IA 13

Over: BRANCH MAQUOKETA RIVER

0.9 mi N of N jct. SR D47, Delaware, IA

Built 1975 Load: 35.3 t ADT: 4,840

LOC FIREFLY RD

Over: SMALL STREAM

089060106, Delaware, IA

Built 1986 Load: 35.6 t ADT: 59

LOC 150TH AVE

Over: SMALL STREAM

090060102, Delaware, IA

Built 1981 Load: 35.6 t ADT: 39

LOCAL 280 ST

Over: ROBINSON CREEK

087060601, Delaware, IA

Built 1981 Load: 36.0 t ADT: 33

FM - 175TH ST

Over: SMALL STREAM

089041105, Delaware, IA

Built 1955 Load: 36.0 t ADT: 59

LOC 110TH AVE

Over: STREAM

090060604, Delaware, IA

Built 1989 Load: 36.0 t ADT: 39

D22 210TH ST

Over: BR PRAIRIE CREEK

089063507, Delaware, IA

Built 1953 Load: 36.3 t ADT: 3,015

LOC BUC-DEL AVE

Over: SPRING BRANCH CREEK

089060702, Delaware, IA

Built 1983 Load: 36.3 t ADT: 33

120TH ST

Over: STREAM

090041301, Delaware, IA

Built 1985 Load: 36.3 t ADT: 26

LOC 255TH AVE

Over: BR ALMORAL CR

089040304, Delaware, IA

Built 1989 Load: 36.3 t ADT: 29

155TH ST

Over: SMALL STREAM

090053105, Delaware, IA

Built 1983 Load: 36.6 t ADT: 49

LOCAL 120 AVE

Over: SMALL STREAM

088062802, Delaware, IA

Built 1982 Load: 37.9 t ADT: 5

LOC 155TH ST

Over: SMALL STREAM

090063605, Delaware, IA

Built 1982 Load: 37.9 t ADT: 49

FM 210 AVE

Over: STREAM

089050104, Delaware, IA

Built 1987 Load: 38.9 t ADT: 25

FM 150 ST

Over: LINDSEY CREEK

090053203, Delaware, IA

Built 1991 Load: 39.0 t ADT: 344

US 20

Over: DRAINAGE DITCH

2.3 MI. E OF JCT. IA 38, Delaware, IA

Built 1963 Load: 39.4 t ADT: 9,000

FM 145 AVE

Over: PRAIRIE CREEK

089062604, Delaware, IA

Built 1971 Load: 39.9 t ADT: 1,296

FM 200 AVE

Over: HONEY CREEK

090052602, Delaware, IA

Built 1998 Load: 45.4 t ADT: 570

FM 145 AVE

Over: SMALL STREAM

089061404, Delaware, IA

Built 1970 Load: 46.3 t ADT: 1,021

FM 165 ST

Over: SMALL STREAM

089060303, Delaware, IA

Built 1970 Load: 47.3 t ADT: 825

EB US 20

Over: OVER ABANDON RR

0.4 MI W OF JCT IOWA #38, Delaware, IA

Built 1974 Load: 47.6 t ADT: 4,250

FM 160TH ST

Over: BEAR CREEK

089030203, Delaware, IA

Built 1994 Load: 48.2 t ADT: 462

180TH AVE

Over: LINDSEY CREEK

090053302, Delaware, IA

Built 2000 Load: 52.9 t ADT: 1,030

FM - 160TH ST

Over: SMALL STREAM

089030203, Delaware, IA

Built 1979 Load: 60.4 t ADT: 462

FM 230 AVE

Over: SMALL STREAM

087040802, Delaware, IA

Built 1963 Load: 72.8 t ADT: 383

FM 255TH ST

Over: SMALL STREAM

088062405, Delaware, IA

Built 1959 Load: 78.0 t ADT: 344

298TH AVE

Over: PLUM CREEK

088033204, Delaware, IA

Built 2005 Load: 4.5 t ADT: 78

FM HONEY CK RD

Over: SMALL STREAM

089051005, Delaware, IA

Built 1957 Load: 17.0 t ADT: 275

221ST ST

Over: SMALL STREAM

088040303, Delaware, IA

Built 2007 Load: 20.7 t ADT: 44

325TH ST

Over: SMALL STREAM

087062703, Delaware, IA

Built 2020 Load: 21.4 t ADT: 26

RAINBOW RD

Over: ELK CREEK

090041403, Delaware, IA

Built 2004 Load: 21.4 t ADT: 29

LOC 225 ST

Over: SMALL STREAM

088040306, Delaware, IA

Built 1996 Load: 22.0 t ADT: 39

210 ST

Over: DRAINAGE DITCH

089053505, Delaware, IA

Built 1978 Load: 22.7 t ADT: 1,463

FM - 180TH AVE

Over: SMALL STREAM

088050506, Delaware, IA

Built 1973 Load: 22.7 t ADT: 960

231ST AVE

Over: SMALL STREAM

087 04 19 09, Delaware, IA

Built 2013 Load: 24.0 t ADT: 11

155TH ST

Over: HONEY CREEK

090053503, Delaware, IA

Built 1983 Load: 25.3 t ADT: 29

LOCAL 330 AVE

Over: SMALL STREAM

088031304, Delaware, IA

Built 1983 Load: 25.9 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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026