County profile · official public datasets

Ida County, IA

182 public highway bridges tracked in the FHWA National Bridge Inventory: 42.9% rated Good, 40.7% Fair, 16.5% Poor.

182
Public bridges
42.9%
Good condition
16.5%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Ida County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 39%
lowest Poor share in state
16.5%
Poor-condition share
182
public highway bridges
1983
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Ida County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Ida County ranks #39 of 99 Iowa counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 16.5%). Ida County, Iowa contains 182 public highway bridges. Roughly 42.9% are rated “Good,” 40.7% “Fair,” and 16.5% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

182

Public highway bridges in Ida County

Good condition

42.9%

78 of 182 rated 7-9

Fair condition

40.7%

74 of 182 rated 5-6

Poor condition

16.5%

30 of 182 rated 4 or below

In-state Poor-share rank

#39 of 99

Among Iowa counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 182 NBI-tracked bridges by lowest applicable component rating.

Good
42.9% (78)
Fair
40.7% (74)
Poor
16.5% (30)

Ida County's Poor-condition bridges carry 10,957 vehicle crossings a day

That is 12.8% of the county's reported daily bridge traffic on 16.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 365 crossings a day against 527 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 182 of 182 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

38.5% of Ida County's bridges have passed the 50-year mark

70 of the 182 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 42.9% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 26.3% of the county's Poor-condition bridge traffic

LOCAL over ODEBOLT CREEK, built 1967, carries 2,884 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 30-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 10,957 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Ida County's bridges were built

182 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 32 of the county's bridges still in the inventory were built, which is 17.6% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1983) matches the Iowa average (1979).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Ida County compares with Iowa's closest counties by inventory size

The 5 Iowa counties nearest Ida County in number of bridges, with their condition splits. Its 16.5% Poor share is the 2nd-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1976 is 7 years newer.

Showing the 5 closest of 98 Iowa counties eligible for comparison.

Bridge inventory size and condition shares for Ida County and the 5 Iowa counties closest to it in inventory size
County Bridges Poor
Osceola County 185 8.6%
Mills County 184 19%
Appanoose County 183 31.1%
Keokuk County 183 19.7%
Wright County 182 29.1%
Ida County (this page) 182 16.5%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Ida County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Ida County, both outside Iowa so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside IA (182 bridges here).

Similar average build year

Nearest mean year-built outside IA (1983 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 182 Good 78 Fair 74 Poor 30

All bridges (182)

LOCAL

Fair

Over: BRANCH BACON CREEK

088410801, Ida, IA

Built 2000 Load: 32.7 t ADT: 26

FM

Fair

Over: CREEK

088412301, Ida, IA

Built 1991 Load: 32.7 t ADT: 100

IA 175

Fair

Over: MOREHEAD CREEK

2.6 mi. W of W jct SR L51, Ida, IA

Built 1985 Load: 34.9 t ADT: 940

US 59

Fair

Over: SILVER CREEK

2.1 mi. N of SR D15, Ida, IA

Built 1972 Load: 36.8 t ADT: 2,200

IA 31

Fair

Over: STREAM

5.3 mi. N of jct. US 20, Ida, IA

Built 1974 Load: 36.9 t ADT: 1,600

LOCAL

Fair

Over: CREEK

088400802, Ida, IA

Built 1965 Load: 39.0 t ADT: 72

LOCAL

Fair

Over: EAST FORK BATTLE CREEK

088403002, Ida, IA

Built 1965 Load: 39.0 t ADT: 15

IA 31

Fair

Over: ASHTON CREEK

1.0 mi. N of SR D15, Ida, IA

Built 1974 Load: 39.7 t ADT: 1,600

IA 175

Fair

Over: STREAM

0.1 mi W of W jct US 59, Ida, IA

Built 1978 Load: 40.1 t ADT: 2,140

LOCAL

Fair

Over: BR SILVER CREEK

088391901, Ida, IA

Built 1999 Load: 40.5 t ADT: 15

LOCAL

Fair

Over: TRIB MAPLE RIVER

088401101, Ida, IA

Built 2002 Load: 41.5 t ADT: 26

LOCAL

Fair

Over: CREEK

089402901, Ida, IA

Built 1999 Load: 41.7 t ADT: 30

FM

Fair

Over: SMALL STREAM

089410102, Ida, IA

Built 1974 Load: 42.4 t ADT: 290

FM

Fair

Over: SMALL STREAM

089411304, Ida, IA

Built 1974 Load: 42.4 t ADT: 290

MARKET AVE

Fair

Over: SOLDIER RIVER

086392902, Ida, IA

Built 2000 Load: 43.2 t ADT: 26

FM

Fair

Over: ALDRICH CREEK

087412001, Ida, IA

Built 1970 Load: 44.1 t ADT: 210

LOCAL

Fair

Over: CREEK

088400202, Ida, IA

Built 1999 Load: 44.2 t ADT: 21

LOCAL

Fair

Over: ASHTON CREEK

089410202, Ida, IA

Built 1999 Load: 45.7 t ADT: 21

MARKET AVE

Fair

Over: CREEK

086392902, Ida, IA

Built 2000 Load: 47.1 t ADT: 26

FM

Fair

Over: BATTLE CREEK

087410102, Ida, IA

Built 1968 Load: 47.2 t ADT: 499

FM

Fair

Over: SMALL STREAM

089412401, Ida, IA

Built 1974 Load: 47.3 t ADT: 210

US 59 & IA 175

Fair

Over: MAPLE RIVER

1 mi. S of N jct. IA 175, Ida, IA

Built 1989 Load: 58.9 t ADT: 4,200

LOCAL

Fair

Over: SMALL

086410603, Ida, IA

Built 1978 Load: 65.2 t ADT: 35

FM

Fair

Over: ALDRICH CREEK

087412804, Ida, IA

Built 1969 Load: 76.2 t ADT: 429

LOCAL

Good

Over: MAPLE RIVER

089391603, Ida, IA

Built 1984 Load: 16.8 t ADT: 35

FM

Good

Over: W FORK BATTLE CREEK

088412201, Ida, IA

Built 2009 Load: 17.4 t ADT: 26

LOCAL

Good

Over: WEST FOR BATTLE CREEK

088412602, Ida, IA

Built 2003 Load: 18.0 t ADT: 21

LOCAL RD

Good

Over: MAPLE RIVER

088402501, Ida, IA

Built 2002 Load: 20.4 t ADT: 21

LOCAL

Good

Over: ASHTON CREEK

089411101, Ida, IA

Built 2009 Load: 21.9 t ADT: 15

LOCAL

Good

Over: ALDRICH CREEK

087411701, Ida, IA

Built 2006 Load: 22.3 t ADT: 26

LOCAL

Good

Over: BR. HOSKINS CREEK

087392803, Ida, IA

Built 1999 Load: 24.5 t ADT: 5

IA 175

Good

Over: STREAM

2.2 mi. W of W jct US 59, Ida, IA

Built 2007 Load: 24.9 t ADT: 2,140

IA 175

Good

Over: STREAM

3.2 mi E of E Jct US 59, Ida, IA

Built 1939 Load: 24.9 t ADT: 2,080

IA 175

Good

Over: STREAM

2.1 mi. E of E jct US 59, Ida, IA

Built 1939 Load: 25.7 t ADT: 2,080

LOCAL

Good

Over: CREEK

089392902, Ida, IA

Built 2001 Load: 26.8 t ADT: 26

FM

Good

Over: BATTLE CREEK

088413501, Ida, IA

Built 1981 Load: 29.0 t ADT: 40

LOCAL

Good

Over: HALFWAY CREEK

089392304, Ida, IA

Built 1986 Load: 29.8 t ADT: 72

IA 175

Good

Over: STREAM

1.6 mi. W of W Jct US 59, Ida, IA

Built 2007 Load: 30.1 t ADT: 2,140

7TH ST

Good

Over: BADGER CREEK

087402305, Ida, IA

Built 2017 Load: 32.4 t ADT: 470

5TH ST

Good

Over: BADGER CREEK

087402301, Ida, IA

Built 2017 Load: 32.4 t ADT: 264

MOOREHEAD AVE

Good

Over: ODEBOLT CREEK

087401400, Ida, IA

Built 2022 Load: 32.4 t ADT: 4,873

US 20 EB

Good

Over: MAPLE RIVER

4.1 MI. E OF E US 59, Ida, IA

Built 2017 Load: 32.4 t ADT: 2,550

US 59

Good

Over: SOLDIER RIVER

1.2 mi N of jct CO RD D54, Ida, IA

Built 2019 Load: 32.4 t ADT: 1,130

IA 175

Good

Over: TRIBUTARY OF ODEBOLT CR

0.5 mi. E of Jct. SR M31, Ida, IA

Built 2011 Load: 32.4 t ADT: 1,820

M15 JASPER AVE

Good

Over: SOLDIER RIVER

086402302, Ida, IA

Built 2015 Load: 32.4 t ADT: 439

220TH AVE

Good

Over: ELK CREEK

087390201, Ida, IA

Built 2014 Load: 32.4 t ADT: 21

D15 125TH ST

Good

Over: BITTER CREEK

089411805, Ida, IA

Built 2020 Load: 32.4 t ADT: 100

US 20 WB

Good

Over: FRITZ CREEK

3.4 mi E of jct US 59, Ida, IA

Built 2017 Load: 32.4 t ADT: 2,550

US 20 WB

Good

Over: MAPLE RIVER

4.1 MI. E. OF E. JCT. 59, Ida, IA

Built 2017 Load: 32.4 t ADT: 2,550

FM

Good

Over: SOLDIER RIVER

086391501, Ida, IA

Built 1989 Load: 32.7 t ADT: 80

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.