Linn County, IA

428 public highway bridges

Linn County Bridge Snapshot

Linn County, Iowa contains 428 public highway bridges in the FHWA National Bridge Inventory. Roughly 40% are rated “Good,” 33.6% “Fair,” 4.7% “Poor,” and 4.7% 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.

428

Total Bridges

40%

Good

4.7%

Poor

4.7%

Structurally Deficient

Condition Distribution

Good

40% (171)

Fair

33.6% (144)

Poor

4.7% (20)

SD

4.7% (20)

All Bridges (428)

Sort:

YATES RD

Over: GANNON CREEK

084083003, Linn, IA

Built 2001 Load: 57.9 t ADT: 15

LINN-BENTON RD

Over: GANNON CREEK

084083102, Linn, IA

Built 2002 Load: 57.9 t ADT: 88

MCNAMARA RD

Over: TRIB BUFFALO CREEK

085050307, Linn, IA

Built 1995 Load: 57.9 t ADT: 59

WAPSIE BANKS RD

Over: TRIB TO WAPSIPINICON

085051603, Linn, IA

Built 1992 Load: 57.9 t ADT: 98

ALDERMAN RD

Over: TRIB WAPSIPINICON RIVER

085052806, Linn, IA

Built 2007 Load: 57.9 t ADT: 33

BURNETT STA.RD.

Over: RICHOHET CREEK

085053001, Linn, IA

Built 1998 Load: 57.9 t ADT: 5

ROWLEY RD

Over: TRIB WAPSIPINICON RIVER

085061008, Linn, IA

Built 2002 Load: 57.9 t ADT: 10

BURNETT STA.RD.

Over: TRIB EAST INDIAN CREEK

085062701, Linn, IA

Built 2003 Load: 57.9 t ADT: 98

LYMAN RD.

Over: E OTTER CR

085070303, Linn, IA

Built 2005 Load: 57.9 t ADT: 29

ALICE RD

Over: TRIB W OTTER CREEK

085070502, Linn, IA

Built 1996 Load: 57.9 t ADT: 137

CUPOLA RD

Over: EAST OTTER CREEK

085071504, Linn, IA

Built 1999 Load: 57.9 t ADT: 70

DEAL RD

Over: W OTTER CREEK,TRIB. TO

085071801, Linn, IA

Built 1997 Load: 57.9 t ADT: 20

DEAL RD

Over: W OTTER CREEK

085071801, Linn, IA

Built 2001 Load: 57.9 t ADT: 20

FOREST EDGE RD

Over: W OTTER CREEK

085071905, Linn, IA

Built 2004 Load: 57.9 t ADT: 59

OLD CENTER RD

Over: E OTTER CREEK

085072103, Linn, IA

Built 2000 Load: 57.9 t ADT: 97

ARABIAN RD

Over: DRY CREEK

085073603, Linn, IA

Built 1991 Load: 57.9 t ADT: 49

ROLLING ACRE RD

Over: EAST BLUE CREEK TRIB TO

085080507, Linn, IA

Built 2002 Load: 57.9 t ADT: 255

ROLLING ACRE RD

Over: EAST BLUE CREEK

085080507, Linn, IA

Built 2002 Load: 57.9 t ADT: 255

QUAIL RIDGE RD

Over: NELSON CREEK

085083503, Linn, IA

Built 1992 Load: 57.9 t ADT: 157

GREENS GROVE RD

Over: NELSON CREEK

085083505, Linn, IA

Built 1991 Load: 57.9 t ADT: 34

CALDWELL RD

Over: BOULDER CREEK

086051602, Linn, IA

Built 2002 Load: 57.9 t ADT: 10

AMMETER RD

Over: TRIB TO BUFFALO CREEK

086051804, Linn, IA

Built 2000 Load: 57.9 t ADT: 11

HILLS MILL RD

Over: BOULDER CREEK

086052004, Linn, IA

Built 2003 Load: 57.9 t ADT: 20

WAGNER RD

Over: CEDAR CREEK

086052106, Linn, IA

Built 2003 Load: 57.9 t ADT: 29

PRAIRIE MAIN RD

Over: CEDAR CREEK

086052905, Linn, IA

Built 2000 Load: 57.9 t ADT: 88

HEATONS VALLEY

Over: TRIB TO HEATONS CREEK

086062303, Linn, IA

Built 1997 Load: 57.9 t ADT: 59

FORD RD

Over: HEATONS CREEK

086063504, Linn, IA

Built 2002 Load: 57.9 t ADT: 59

CAMPFIRE RD

Over: TRIB TO WAPSIPINICON R

086071703, Linn, IA

Built 1997 Load: 57.9 t ADT: 88

WEST OTTER RD

Over: W OTTER CREEK

086073002, Linn, IA

Built 1999 Load: 57.9 t ADT: 29

JUSTINS RD

Over: JUSTINS CREEK

086073603, Linn, IA

Built 2000 Load: 57.9 t ADT: 26

BETTYS GROVE RD

Over: E BLUE CREEK

086081502, Linn, IA

Built 2001 Load: 57.9 t ADT: 128

BETTYS GROVE RD

Over: EAST BLUE CREEK

086082202, Linn, IA

Built 2001 Load: 57.9 t ADT: 10

WILEYS RD

Over: W OTTER CREEK

086082401, Linn, IA

Built 2001 Load: 57.9 t ADT: 49

RING RD

Over: E BLUE CREEK

086082803, Linn, IA

Built 2001 Load: 57.9 t ADT: 29

RING RD

Over: EAST BLUE CREEK

086082808, Linn, IA

Built 2003 Load: 57.9 t ADT: 29

FEE RD

Over: E BLUE CREEK

086083307, Linn, IA

Built 2007 Load: 57.9 t ADT: 70

GRUBBS CR RD

Over: CRUBB CREEK

086083405, Linn, IA

Built 1997 Load: 57.9 t ADT: 70

UP.BOULDER RD

Over: BISON CREEK

086051803, Linn, IA

Built 1995 Load: 57.9 t ADT: 29

UPPER BOULDER R

Over: SILVER CREEK

086051401, Linn, IA

Built 1998 Load: 57.9 t ADT: 11

MORGAN BR RD

Over: MORGAN CREEK

083082802, Linn, IA

Built 2000 Load: 57.9 t ADT: 34

ALDERMAN RD

Over: LITTLE BIG CREEK

084051502, Linn, IA

Built 2000 Load: 57.9 t ADT: 59

PARIS RD

Over: EAST OTTER CREEK

086072701, Linn, IA

Built 2000 Load: 57.9 t ADT: 216

NORTH MARION RD

Over: DRY CREEK

085060702, Linn, IA

Built 2001 Load: 57.9 t ADT: 44

76TH AVE SW

Over: TISSLE HOLLOW CREEK

Linn # 1182, Linn, IA

Built 2010 Load: 57.9 t ADT: 137

MIDWAY RD

Over: E OTTER CR

084070705, Linn, IA

Built 2005 Load: 58.0 t ADT: 255

ALBURNETT RD

Over: DRY CREEK

085073608, Linn, IA

Built 1996 Load: 58.3 t ADT: 1,895

WILLOW CR.RD.

Over: WILLOW CREEK

082051604, Linn, IA

Built 1996 Load: 59.1 t ADT: 39

AUSTIN RD

Over: E INDIAN CREEK

084060401, Linn, IA

Built 1994 Load: 59.1 t ADT: 90

US 30

Over: DRAINAGE

1.4 mi. E US30/IA1 INTCHG, Linn, IA

Built 2018 Load: 60.3 t ADT: 5,400

LINN BENTON RD

Over: BR OF BLUE CREEK

086081802, Linn, IA

Built 2018 Load: 63.2 t ADT: 25

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