County profile · official public datasets

Keokuk County, IA

183 public highway bridges tracked in the FHWA National Bridge Inventory: 34.4% rated Good, 45.9% Fair, 19.7% Poor.

183
Public bridges: 34.4%
Good condition: 19.7%
Poor condition

The verdict

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

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

54th
of 99 on Poor share: 19.7%
Poor-condition share: 183
public highway bridges: 1980
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.

Keokuk County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Keokuk County ranks #54 of 99 Iowa counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 19.7%). Keokuk County, Iowa contains 183 public highway bridges. Roughly 34.4% are rated “Good,” 45.9% “Fair,” and 19.7% “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

183

Public highway bridges in Keokuk County

Good condition

34.4%

63 of 183 rated 7-9

Fair condition

45.9%

84 of 183 rated 5-6

Poor condition

19.7%

36 of 183 rated 4 or below

In-state Poor-share rank

#54 of 99

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

Condition distribution

Share of 183 NBI-tracked bridges by lowest applicable component rating.

Good

34.4% (63)

Fair

45.9% (84)

Poor

19.7% (36)

Keokuk County's Poor-condition bridges carry 4,379 vehicle crossings a day

That is 8.7% of the county's reported daily bridge traffic on 19.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 122 crossings a day against 152 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 183 of 183 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

43.2% of Keokuk County's bridges have passed the 50-year mark

79 of the 183 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 34.4% 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 27.2% of the county's Poor-condition bridge traffic

IA 78 over STREAM, built 1937, carries 1,190 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 36-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 4,379 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1930s

10
1940s

9
1950s

20
1960s

28
1970s

28
1980s

17
1990s

26
2000s

28
2010s

14
2020s

3

What this shows Construction peaked in the 1960s, when 28 of the county's bridges still in the inventory were built, which is 15.3% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1980) matches the Iowa average (1979).

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

The 5 Iowa counties nearest Keokuk County in number of bridges, with their condition splits. Its 19.7% Poor share is the 4th-lowest of these 6. Its average build year of 1980 against a peer-group mean of 1977 is in line with the group.

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

Bridge inventory size and condition shares for Keokuk County and the 5 Iowa counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Osceola County	185	38.4%	53%	8.6%	1965
Mills County	184	29.3%	51.6%	19%	1976
Appanoose County	183	41%	27.9%	31.1%	1981
Keokuk County (this page)	183	34.4%	45.9%	19.7%	1980
Ida County	182	42.9%	40.7%	16.5%	1983
Wright County	182	35.2%	35.7%	29.1%	1979

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 Keokuk 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 Keokuk County, both outside Iowa so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside IA (183 bridges here).

St. Clair County, AL · 183 bridges
Richmond County, GA · 183 bridges
Marshall County, IN · 183 bridges
Scott County, KY · 183 bridges

Similar average build year

Nearest mean year-built outside IA (1980 here).

Tulsa County, OK · avg 1980 · 1,135 bridges
Miami-Dade County, FL · avg 1980 · 1,057 bridges
Pulaski County, AR · avg 1980 · 721 bridges
McLennan County, TX · avg 1980 · 714 bridges

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

All 183 Good 63 Fair 84 Poor 36

Good-condition bridges (63)

Sort:

Keokuk County Bridge Snapshot

Condition distribution

Keokuk County's Poor-condition bridges carry 4,379 vehicle crossings a day

43.2% of Keokuk County's bridges have passed the 50-year mark

One structure carries 27.2% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Good-condition bridges (63)

LOCAL

LOCAL

LOCAL

LOCAL

LOCAL

FM

150TH AVE

230TH ST

FM

FM

IA 21

FM

305TH ST

FM

LOCAL

LOCAL

IA 78

V67 280TH AVE

FM

180TH ST

G29 170TH ST

G29 170TH ST

195TH ST

150TH AVE

318TH AVE

W15 330TH AVE

V44 190TH AVE

180TH AVE

V 5G

FM

290TH AVE

FM

LOCAL

FM

LOCAL

FM

FM

LOCAL ROAD

120TH STREET

LOCAL

LOCAL

FM

LOCAL

CO RD W15

FM

LOCAL

LOCAL

FM

FM

FM

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